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mutter/cogl/cogl-sub-texture.c

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cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
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* Copyright (C) 2009,2010 Intel Corporation.
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* Authors:
* Neil Roberts <neil@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl.h"
#include "cogl-internal.h"
#include "cogl-util.h"
#include "cogl-texture-private.h"
#include "cogl-sub-texture-private.h"
#include "cogl-context.h"
#include "cogl-handle.h"
#include "cogl-texture-driver.h"
#include <string.h>
#include <math.h>
static void _cogl_sub_texture_free (CoglSubTexture *sub_tex);
COGL_HANDLE_DEFINE (SubTexture, sub_texture);
static const CoglTextureVtable cogl_sub_texture_vtable;
static void
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-09 20:57:32 -05:00
_cogl_sub_texture_map_range (float *t1, float *t2,
int sub_offset,
int sub_size,
int full_size)
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
{
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-09 20:57:32 -05:00
float t1_frac, t1_int, t2_frac, t2_int;
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
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t1_frac = modff (*t1, &t1_int);
t2_frac = modff (*t2, &t2_int);
if (t1_frac < 0.0f)
{
t1_frac += 1.0f;
t1_int -= 1.0f;
}
if (t2_frac < 0.0f)
{
t2_frac += 1.0f;
t2_int -= 1.0f;
}
/* If one of the coordinates is zero we need to make sure it is
still greater than the other coordinate if it was originally so
we'll flip it to the other side */
if (*t1 < *t2)
{
if (t2_frac == 0.0f)
{
t2_frac = 1.0f;
t2_int -= 1.0f;
}
}
else
{
if (t1_frac == 0.0f)
{
t1_frac = 1.0f;
t1_int -= 1.0f;
}
}
/* Convert the fractional part leaving the integer part intact */
t1_frac = (sub_offset + t1_frac * sub_size) / full_size;
*t1 = t1_frac + t1_int;
t2_frac = (sub_offset + t2_frac * sub_size) / full_size;
*t2 = t2_frac + t2_int;
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
}
static void
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
_cogl_sub_texture_map_quad (CoglSubTexture *sub_tex,
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-09 20:57:32 -05:00
float *coords)
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
{
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-09 20:57:32 -05:00
unsigned int full_width = cogl_texture_get_width (sub_tex->full_texture);
unsigned int full_height = cogl_texture_get_height (sub_tex->full_texture);
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
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_cogl_sub_texture_map_range (coords + 0, coords + 2,
sub_tex->sub_x, sub_tex->sub_width,
full_width);
_cogl_sub_texture_map_range (coords + 1, coords + 3,
sub_tex->sub_y, sub_tex->sub_height,
full_height);
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
}
/* Maps from the texture coordinates of the full texture to the
texture coordinates of the sub texture */
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-09 20:57:32 -05:00
static float
_cogl_sub_texture_unmap_coord (float t,
int sub_offset,
int sub_size,
int full_size)
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
{
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-09 20:57:32 -05:00
float frac_part, int_part;
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
/* Convert the fractional part leaving the integer part in tact */
frac_part = modff (t, &int_part);
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
cogl: Add a fallback for when the signbit macro is missing The signbit macro is defined in C99 so it should be available but some versions of GCC don't appear to define it by default. If it's not available we can use a hack to test the bit directly.
2010-02-11 09:20:48 -05:00
if (cogl_util_float_signbit (frac_part))
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
frac_part = ((1.0f + frac_part) * full_size -
sub_offset - sub_size) / sub_size;
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
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else
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
frac_part = (frac_part * full_size - sub_offset) / sub_size;
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
return frac_part + int_part;
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
}
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
static void
_cogl_sub_texture_unmap_coords (CoglSubTexture *sub_tex,
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-09 20:57:32 -05:00
float *s,
float *t)
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
{
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-09 20:57:32 -05:00
unsigned int full_width = cogl_texture_get_width (sub_tex->full_texture);
unsigned int full_height = cogl_texture_get_height (sub_tex->full_texture);
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
*s = _cogl_sub_texture_unmap_coord (*s, sub_tex->sub_x, sub_tex->sub_width,
full_width);
*t = _cogl_sub_texture_unmap_coord (*t, sub_tex->sub_y, sub_tex->sub_height,
full_height);
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
}
typedef struct _CoglSubTextureForeachData
{
CoglSubTexture *sub_tex;
CoglTextureSliceCallback callback;
void *user_data;
} CoglSubTextureForeachData;
static void
_cogl_sub_texture_foreach_cb (CoglHandle handle,
GLuint gl_handle,
GLenum gl_target,
const float *slice_coords,
const float *full_virtual_coords,
void *user_data)
{
CoglSubTextureForeachData *data = user_data;
float virtual_coords[4];
memcpy (virtual_coords, full_virtual_coords, sizeof (virtual_coords));
/* Convert the virtual coords from the full-texture space to the sub
texture space */
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
_cogl_sub_texture_unmap_coords (data->sub_tex,
&virtual_coords[0],
&virtual_coords[1]);
_cogl_sub_texture_unmap_coords (data->sub_tex,
&virtual_coords[2],
&virtual_coords[3]);
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
data->callback (handle, gl_handle, gl_target,
slice_coords, virtual_coords,
data->user_data);
}
static void
_cogl_sub_texture_manual_repeat_cb (const float *coords,
void *user_data)
{
CoglSubTextureForeachData *data = user_data;
float mapped_coords[4];
memcpy (mapped_coords, coords, sizeof (mapped_coords));
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
_cogl_sub_texture_map_quad (data->sub_tex, mapped_coords);
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
_cogl_texture_foreach_sub_texture_in_region (data->sub_tex->full_texture,
mapped_coords[0],
mapped_coords[1],
mapped_coords[2],
mapped_coords[3],
_cogl_sub_texture_foreach_cb,
user_data);
}
static void
_cogl_sub_texture_foreach_sub_texture_in_region (
CoglTexture *tex,
float virtual_tx_1,
float virtual_ty_1,
float virtual_tx_2,
float virtual_ty_2,
CoglTextureSliceCallback callback,
void *user_data)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
CoglSubTextureForeachData data;
data.sub_tex = sub_tex;
data.callback = callback;
data.user_data = user_data;
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
_cogl_texture_iterate_manual_repeats (_cogl_sub_texture_manual_repeat_cb,
virtual_tx_1, virtual_ty_1,
virtual_tx_2, virtual_ty_2,
&data);
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
}
static void
_cogl_sub_texture_set_wrap_mode_parameter (CoglTexture *tex,
GLenum wrap_mode)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
_cogl_texture_set_wrap_mode_parameter (sub_tex->full_texture, wrap_mode);
}
static void
_cogl_sub_texture_free (CoglSubTexture *sub_tex)
{
cogl_handle_unref (sub_tex->full_texture);
g_free (sub_tex);
}
CoglHandle
_cogl_sub_texture_new (CoglHandle full_texture,
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-09 20:57:32 -05:00
int sub_x, int sub_y,
int sub_width, int sub_height)
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
{
CoglSubTexture *sub_tex;
CoglTexture *tex;
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-09 20:57:32 -05:00
unsigned int full_width, full_height;
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
full_width = cogl_texture_get_width (full_texture);
cogl-atlas-texture: Fix a cut and paste error when getting the height There was a typo in getting the height of the full texture to check whether the sub region fits so that it was using the width instead. This was causing crashes when debugging is enabled for some apps.
2010-02-05 12:03:04 -05:00
full_height = cogl_texture_get_height (full_texture);
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
/* The region must specify a non-zero subset of the full texture */
g_return_val_if_fail (sub_x >= 0 && sub_y >= 0, COGL_INVALID_HANDLE);
g_return_val_if_fail (sub_width > 0 && sub_height > 0, COGL_INVALID_HANDLE);
g_return_val_if_fail (sub_x + sub_width <= full_width, COGL_INVALID_HANDLE);
g_return_val_if_fail (sub_y + sub_height <= full_height, COGL_INVALID_HANDLE);
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
sub_tex = g_new (CoglSubTexture, 1);
tex = COGL_TEXTURE (sub_tex);
tex->vtable = &cogl_sub_texture_vtable;
sub_tex->full_texture = cogl_handle_ref (full_texture);
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
sub_tex->sub_x = sub_x;
sub_tex->sub_y = sub_y;
sub_tex->sub_width = sub_width;
sub_tex->sub_height = sub_height;
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
return _cogl_sub_texture_handle_new (sub_tex);
}
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-09 20:57:32 -05:00
static int
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
_cogl_sub_texture_get_max_waste (CoglTexture *tex)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
return cogl_texture_get_max_waste (sub_tex->full_texture);
}
static gboolean
_cogl_sub_texture_is_sliced (CoglTexture *tex)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
return cogl_texture_is_sliced (sub_tex->full_texture);
}
static gboolean
_cogl_sub_texture_can_hardware_repeat (CoglTexture *tex)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
/* We can hardware repeat if the subtexture actually represents all of the
of the full texture */
return (sub_tex->sub_width ==
cogl_texture_get_width (sub_tex->full_texture) &&
sub_tex->sub_height ==
cogl_texture_get_height (sub_tex->full_texture) &&
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
_cogl_texture_can_hardware_repeat (sub_tex->full_texture));
}
static void
_cogl_sub_texture_transform_coords_to_gl (CoglTexture *tex,
float *s,
float *t)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
/* This won't work if the sub texture is not the size of the full
texture and the coordinates are outside the range [0,1] */
*s = ((*s * sub_tex->sub_width + sub_tex->sub_x) /
cogl_texture_get_width (sub_tex->full_texture));
*t = ((*t * sub_tex->sub_height + sub_tex->sub_y) /
cogl_texture_get_height (sub_tex->full_texture));
Remove return from void functions This patch fixes compilation on suncc. http://bugzilla.openedhand.com/show_bug.cgi?id=1978 Signed-off-by: Emmanuele Bassi <ebassi@linux.intel.com>
2010-02-09 05:21:37 -05:00
_cogl_texture_transform_coords_to_gl (sub_tex->full_texture, s, t);
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
}
static gboolean
_cogl_sub_texture_transform_quad_coords_to_gl (CoglTexture *tex,
float *coords)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
int i;
/* We can't support repeating with this method. In this case
cogl-primitives will resort to manual repeating */
for (i = 0; i < 4; i++)
if (coords[i] < 0.0f || coords[i] > 1.0f)
return FALSE;
_cogl_sub_texture_map_quad (sub_tex, coords);
_cogl_texture_transform_quad_coords_to_gl (sub_tex->full_texture, coords);
return TRUE;
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
}
static gboolean
_cogl_sub_texture_get_gl_texture (CoglTexture *tex,
GLuint *out_gl_handle,
GLenum *out_gl_target)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
return cogl_texture_get_gl_texture (sub_tex->full_texture,
out_gl_handle,
out_gl_target);
}
static void
_cogl_sub_texture_set_filters (CoglTexture *tex,
GLenum min_filter,
GLenum mag_filter)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
_cogl_texture_set_filters (sub_tex->full_texture, min_filter, mag_filter);
}
static void
_cogl_sub_texture_ensure_mipmaps (CoglTexture *tex)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
_cogl_texture_ensure_mipmaps (sub_tex->full_texture);
}
static void
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
_cogl_sub_texture_ensure_non_quad_rendering (CoglTexture *tex)
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
{
}
static gboolean
_cogl_sub_texture_set_region (CoglTexture *tex,
int src_x,
int src_y,
int dst_x,
int dst_y,
unsigned int dst_width,
unsigned int dst_height,
int width,
int height,
CoglPixelFormat format,
unsigned int rowstride,
const guint8 *data)
{
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
return cogl_texture_set_region (sub_tex->full_texture,
src_x, src_y,
dst_x + sub_tex->sub_x,
dst_y + sub_tex->sub_y,
dst_width, dst_height,
width, height,
format,
rowstride,
data);
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
}
static void
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-09 20:57:32 -05:00
_cogl_sub_texture_copy_region (guint8 *dst,
const guint8 *src,
int dst_x, int dst_y,
int src_x, int src_y,
int width, int height,
int dst_rowstride,
int src_rowstride,
int bpp)
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
{
int y;
dst += dst_x * bpp + dst_y * dst_rowstride;
src += src_x * bpp + src_y * src_rowstride;
for (y = 0; y < height; y++)
{
memcpy (dst, src, bpp * width);
dst += dst_rowstride;
src += src_rowstride;
}
}
static int
_cogl_sub_texture_get_data (CoglTexture *tex,
CoglPixelFormat format,
unsigned int rowstride,
guint8 *data)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
unsigned int full_rowstride;
guint8 *full_data;
int byte_size, full_size;
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-09 20:57:32 -05:00
int bpp;
int full_tex_width, full_tex_height;
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
/* FIXME: This gets the full data from the full texture and then
copies a subregion of that. It would be better if there was a
texture_get_sub_data virtual and it can just munge the texture
coordinates */
/* Default to internal format if none specified */
if (format == COGL_PIXEL_FORMAT_ANY)
format = cogl_texture_get_format (sub_tex->full_texture);
full_tex_width = cogl_texture_get_width (sub_tex->full_texture);
full_tex_height = cogl_texture_get_height (sub_tex->full_texture);
/* Rowstride from texture width if none specified */
bpp = _cogl_get_format_bpp (format);
if (rowstride == 0)
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
rowstride = sub_tex->sub_width * bpp;
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
/* Return byte size if only that requested */
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
byte_size = sub_tex->sub_height * rowstride;
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
if (data == NULL)
return byte_size;
full_rowstride = _cogl_get_format_bpp (format) * full_tex_width;
full_data = g_malloc (full_rowstride * full_tex_height);
full_size = cogl_texture_get_data (sub_tex->full_texture, format,
full_rowstride, full_data);
if (full_size)
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
_cogl_sub_texture_copy_region (data, full_data,
0, 0,
sub_tex->sub_x,
sub_tex->sub_y,
sub_tex->sub_width,
sub_tex->sub_height,
rowstride,
full_rowstride,
bpp);
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
else
byte_size = 0;
g_free (full_data);
return byte_size;
}
static CoglPixelFormat
_cogl_sub_texture_get_format (CoglTexture *tex)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
return cogl_texture_get_format (sub_tex->full_texture);
}
static GLenum
_cogl_sub_texture_get_gl_format (CoglTexture *tex)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
return _cogl_texture_get_gl_format (sub_tex->full_texture);
}
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-09 20:57:32 -05:00
static int
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
_cogl_sub_texture_get_width (CoglTexture *tex)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
return sub_tex->sub_width;
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
}
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-09 20:57:32 -05:00
static int
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
_cogl_sub_texture_get_height (CoglTexture *tex)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
return sub_tex->sub_height;
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
}
static const CoglTextureVtable
cogl_sub_texture_vtable =
{
_cogl_sub_texture_set_region,
_cogl_sub_texture_get_data,
_cogl_sub_texture_foreach_sub_texture_in_region,
_cogl_sub_texture_get_max_waste,
_cogl_sub_texture_is_sliced,
_cogl_sub_texture_can_hardware_repeat,
_cogl_sub_texture_transform_coords_to_gl,
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
_cogl_sub_texture_transform_quad_coords_to_gl,
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
_cogl_sub_texture_get_gl_texture,
_cogl_sub_texture_set_filters,
_cogl_sub_texture_ensure_mipmaps,
cogl: Make CoglSubTexture only work for quad rendering The sub texture backend doesn't work well as a completely general texture backend because for example when rendering with cogl_polygon it needs to be able to tranform arbitrary texture coordinates without reference to the other coordintes. This can't be done when the texture coordinates are a multiple of one because sometimes the coordinate should represent the left or top edge and sometimes it should represent the bottom or top edge. For example if the s coordinates are 0 and 1 then 1 represents the right edge but if they are 1 and 2 then 1 represents the left edge. Instead the sub-textures are now documented not to support coordinates outside the range [0,1]. The coordinates for the sub-region are now represented as integers as this helps avoid rounding issues. The region can no longer be a super-region of the texture as this simplifies the code quite a lot. There are two new texture virtual functions: transform_quad_coords_to_gl - This transforms two pairs of coordinates representing a quad. It will return FALSE if the coordinates can not be transformed. The sub texture backend uses this to detect coordinates that require repeating which causes cogl-primitives to use manual repeating. ensure_non_quad_rendering - This is used in cogl_polygon and cogl_vertex_buffer to inform the texture backend that transform_quad_to_gl is going to be used. The atlas backend migrates the texture out of the atlas when it hits this.
2010-01-18 04:22:04 -05:00
_cogl_sub_texture_ensure_non_quad_rendering,
cogl: Add a sub texture backend This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
2009-11-27 11:39:16 -05:00
_cogl_sub_texture_set_wrap_mode_parameter,
_cogl_sub_texture_get_format,
_cogl_sub_texture_get_gl_format,
_cogl_sub_texture_get_width,
_cogl_sub_texture_get_height
};
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