brl/mutter
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
8b8f5efbe5
mutter/cogl/cogl-texture-3d.c

671 lines
21 KiB
C
Raw Normal View History

Add a Cogl texture 3D backend This adds a publicly exposed experimental API for a 3D texture backend. There is a feature flag which can be checked for whether 3D textures are supported. Although we require OpenGL 1.2 which has 3D textures in core, GLES only provides them through an extension so the feature can be used to detect that. The textures can be created with one of two new API functions :- cogl_texture_3d_new_with_size and cogl_texture_3d_new_from_data There is also internally a new_from_bitmap function. new_from_data is implemented in terms of this function. The two constructors are effectively the only way to upload data to a 3D texture. It does not work to call glTexImage2D with the GL_TEXTURE_3D target so the virtual for cogl_texture_set_region does nothing. It would be possible to make cogl_texture_get_data do something sensible like returning all of the images as a single long image but this is not currently implemented and instead the virtual just always fails. We may want to add API specific to the 3D texture backend to get and set a sub region of the texture. All of those three functions can throw a GError. This will happen if the GPU does not support 3D textures or it does not support NPOTs and an NPOT size is requested. It will also fail if the FBO extension is not supported and the COGL_TEXTURE_NO_AUTO_MIPMAP flag is not given. This could be avoided by copying the code for the GL_GENERATE_MIPMAP TexParameter fallback, but in the interests of keeping the code simple this is not yet done. This adds a couple of functions to cogl-texture-driver for uploading 3D data and querying the 3D proxy texture. prep_gl_for_pixels_upload_full now also takes sets the GL_UNPACK_IMAGE_HEIGHT parameter so that 3D textures can have padding between the images. Whenever 3D texture is uploading, both the height of the images and the height of all of the data is specified (either explicitly or implicilty from the CoglBitmap) so that the image height can be deduced by dividing by the depth.
2010-07-01 17:04:59 -04:00
/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2010 Intel Corporation.
*
* 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, see <http://www.gnu.org/licenses/>.
*
* 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-texture-3d-private.h"
#include "cogl-texture-driver.h"
#include "cogl-context.h"
#include "cogl-handle.h"
#include "cogl-journal-private.h"
#include "cogl-material-private.h"
#include <string.h>
#include <math.h>
/* These might not be defined on GLES */
#ifndef GL_TEXTURE_3D
#define GL_TEXTURE_3D 0x806F
#endif
#ifndef GL_TEXTURE_WRAP_R
#define GL_TEXTURE_WRAP_R 0x8072
#endif
#define glTexImage3D ctx->drv.pf_glTexImage3D
static void _cogl_texture_3d_free (CoglTexture3D *tex_3d);
COGL_TEXTURE_DEFINE (Texture3D, texture_3d);
static const CoglTextureVtable cogl_texture_3d_vtable;
typedef struct _CoglTexture3DManualRepeatData
{
CoglTexture3D *tex_3d;
CoglTextureSliceCallback callback;
void *user_data;
} CoglTexture3DManualRepeatData;
static void
_cogl_texture_3d_wrap_coords (float t_1, float t_2,
float *out_t_1, float *out_t_2)
{
float int_part;
/* Wrap t_1 and t_2 to the range [0,1] */
modff (t_1 < t_2 ? t_1 : t_2, &int_part);
t_1 -= int_part;
t_2 -= int_part;
if (cogl_util_float_signbit (int_part))
{
*out_t_1 = 1.0f + t_1;
*out_t_2 = 1.0f + t_2;
}
else
{
*out_t_1 = t_1;
*out_t_2 = t_2;
}
}
static void
_cogl_texture_3d_manual_repeat_cb (const float *coords,
void *user_data)
{
CoglTexture3DManualRepeatData *data = user_data;
float slice_coords[4];
_cogl_texture_3d_wrap_coords (coords[0], coords[2],
slice_coords + 0, slice_coords + 2);
_cogl_texture_3d_wrap_coords (coords[1], coords[3],
slice_coords + 1, slice_coords + 3);
data->callback (COGL_TEXTURE (data->tex_3d),
data->tex_3d->gl_texture,
GL_TEXTURE_3D,
slice_coords,
coords,
data->user_data);
}
static void
_cogl_texture_3d_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)
{
CoglTexture3D *tex_3d = COGL_TEXTURE_3D (tex);
CoglTexture3DManualRepeatData data;
data.tex_3d = tex_3d;
data.callback = callback;
data.user_data = user_data;
/* We need to implement manual repeating because if Cogl is calling
this function then it will set the wrap mode to GL_CLAMP_TO_EDGE
and hardware repeating can't be done */
_cogl_texture_iterate_manual_repeats (_cogl_texture_3d_manual_repeat_cb,
virtual_tx_1, virtual_ty_1,
virtual_tx_2, virtual_ty_2,
&data);
}
static void
_cogl_texture_3d_set_wrap_mode_parameters (CoglTexture *tex,
GLenum wrap_mode_s,
GLenum wrap_mode_t,
Rename the third texure coordinate from 'r' to 'p' Using 'r' to name the third component is problematic because that is commonly used to represent the red component of a vector representing a color. Under GLSL this is awkward because the texture swizzling for a vector uses a single letter for each component and the names for colors, textures and positions are synonymous. GLSL works around this by naming the components of the texture s, t, p and q. Cogl already effectively already exposes this naming because it exposes GLSL so it makes sense to use that naming consistently. Another alternative could be u, v and w. This is what Blender and Direct3D use. However the w component conflicts with the w component of a position vertex.
2010-07-12 12:01:32 -04:00
GLenum wrap_mode_p)
Add a Cogl texture 3D backend This adds a publicly exposed experimental API for a 3D texture backend. There is a feature flag which can be checked for whether 3D textures are supported. Although we require OpenGL 1.2 which has 3D textures in core, GLES only provides them through an extension so the feature can be used to detect that. The textures can be created with one of two new API functions :- cogl_texture_3d_new_with_size and cogl_texture_3d_new_from_data There is also internally a new_from_bitmap function. new_from_data is implemented in terms of this function. The two constructors are effectively the only way to upload data to a 3D texture. It does not work to call glTexImage2D with the GL_TEXTURE_3D target so the virtual for cogl_texture_set_region does nothing. It would be possible to make cogl_texture_get_data do something sensible like returning all of the images as a single long image but this is not currently implemented and instead the virtual just always fails. We may want to add API specific to the 3D texture backend to get and set a sub region of the texture. All of those three functions can throw a GError. This will happen if the GPU does not support 3D textures or it does not support NPOTs and an NPOT size is requested. It will also fail if the FBO extension is not supported and the COGL_TEXTURE_NO_AUTO_MIPMAP flag is not given. This could be avoided by copying the code for the GL_GENERATE_MIPMAP TexParameter fallback, but in the interests of keeping the code simple this is not yet done. This adds a couple of functions to cogl-texture-driver for uploading 3D data and querying the 3D proxy texture. prep_gl_for_pixels_upload_full now also takes sets the GL_UNPACK_IMAGE_HEIGHT parameter so that 3D textures can have padding between the images. Whenever 3D texture is uploading, both the height of the images and the height of all of the data is specified (either explicitly or implicilty from the CoglBitmap) so that the image height can be deduced by dividing by the depth.
2010-07-01 17:04:59 -04:00
{
CoglTexture3D *tex_3d = COGL_TEXTURE_3D (tex);
/* Only set the wrap mode if it's different from the current value
to avoid too many GL calls. */
if (tex_3d->wrap_mode_s != wrap_mode_s ||
tex_3d->wrap_mode_t != wrap_mode_t ||
Rename the third texure coordinate from 'r' to 'p' Using 'r' to name the third component is problematic because that is commonly used to represent the red component of a vector representing a color. Under GLSL this is awkward because the texture swizzling for a vector uses a single letter for each component and the names for colors, textures and positions are synonymous. GLSL works around this by naming the components of the texture s, t, p and q. Cogl already effectively already exposes this naming because it exposes GLSL so it makes sense to use that naming consistently. Another alternative could be u, v and w. This is what Blender and Direct3D use. However the w component conflicts with the w component of a position vertex.
2010-07-12 12:01:32 -04:00
tex_3d->wrap_mode_p != wrap_mode_p)
Add a Cogl texture 3D backend This adds a publicly exposed experimental API for a 3D texture backend. There is a feature flag which can be checked for whether 3D textures are supported. Although we require OpenGL 1.2 which has 3D textures in core, GLES only provides them through an extension so the feature can be used to detect that. The textures can be created with one of two new API functions :- cogl_texture_3d_new_with_size and cogl_texture_3d_new_from_data There is also internally a new_from_bitmap function. new_from_data is implemented in terms of this function. The two constructors are effectively the only way to upload data to a 3D texture. It does not work to call glTexImage2D with the GL_TEXTURE_3D target so the virtual for cogl_texture_set_region does nothing. It would be possible to make cogl_texture_get_data do something sensible like returning all of the images as a single long image but this is not currently implemented and instead the virtual just always fails. We may want to add API specific to the 3D texture backend to get and set a sub region of the texture. All of those three functions can throw a GError. This will happen if the GPU does not support 3D textures or it does not support NPOTs and an NPOT size is requested. It will also fail if the FBO extension is not supported and the COGL_TEXTURE_NO_AUTO_MIPMAP flag is not given. This could be avoided by copying the code for the GL_GENERATE_MIPMAP TexParameter fallback, but in the interests of keeping the code simple this is not yet done. This adds a couple of functions to cogl-texture-driver for uploading 3D data and querying the 3D proxy texture. prep_gl_for_pixels_upload_full now also takes sets the GL_UNPACK_IMAGE_HEIGHT parameter so that 3D textures can have padding between the images. Whenever 3D texture is uploading, both the height of the images and the height of all of the data is specified (either explicitly or implicilty from the CoglBitmap) so that the image height can be deduced by dividing by the depth.
2010-07-01 17:04:59 -04:00
{
_cogl_bind_gl_texture_transient (GL_TEXTURE_3D,
tex_3d->gl_texture,
FALSE);
GE( glTexParameteri (GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, wrap_mode_s) );
GE( glTexParameteri (GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, wrap_mode_t) );
Rename the third texure coordinate from 'r' to 'p' Using 'r' to name the third component is problematic because that is commonly used to represent the red component of a vector representing a color. Under GLSL this is awkward because the texture swizzling for a vector uses a single letter for each component and the names for colors, textures and positions are synonymous. GLSL works around this by naming the components of the texture s, t, p and q. Cogl already effectively already exposes this naming because it exposes GLSL so it makes sense to use that naming consistently. Another alternative could be u, v and w. This is what Blender and Direct3D use. However the w component conflicts with the w component of a position vertex.
2010-07-12 12:01:32 -04:00
GE( glTexParameteri (GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, wrap_mode_p) );
Add a Cogl texture 3D backend This adds a publicly exposed experimental API for a 3D texture backend. There is a feature flag which can be checked for whether 3D textures are supported. Although we require OpenGL 1.2 which has 3D textures in core, GLES only provides them through an extension so the feature can be used to detect that. The textures can be created with one of two new API functions :- cogl_texture_3d_new_with_size and cogl_texture_3d_new_from_data There is also internally a new_from_bitmap function. new_from_data is implemented in terms of this function. The two constructors are effectively the only way to upload data to a 3D texture. It does not work to call glTexImage2D with the GL_TEXTURE_3D target so the virtual for cogl_texture_set_region does nothing. It would be possible to make cogl_texture_get_data do something sensible like returning all of the images as a single long image but this is not currently implemented and instead the virtual just always fails. We may want to add API specific to the 3D texture backend to get and set a sub region of the texture. All of those three functions can throw a GError. This will happen if the GPU does not support 3D textures or it does not support NPOTs and an NPOT size is requested. It will also fail if the FBO extension is not supported and the COGL_TEXTURE_NO_AUTO_MIPMAP flag is not given. This could be avoided by copying the code for the GL_GENERATE_MIPMAP TexParameter fallback, but in the interests of keeping the code simple this is not yet done. This adds a couple of functions to cogl-texture-driver for uploading 3D data and querying the 3D proxy texture. prep_gl_for_pixels_upload_full now also takes sets the GL_UNPACK_IMAGE_HEIGHT parameter so that 3D textures can have padding between the images. Whenever 3D texture is uploading, both the height of the images and the height of all of the data is specified (either explicitly or implicilty from the CoglBitmap) so that the image height can be deduced by dividing by the depth.
2010-07-01 17:04:59 -04:00
tex_3d->wrap_mode_s = wrap_mode_s;
tex_3d->wrap_mode_t = wrap_mode_t;
Rename the third texure coordinate from 'r' to 'p' Using 'r' to name the third component is problematic because that is commonly used to represent the red component of a vector representing a color. Under GLSL this is awkward because the texture swizzling for a vector uses a single letter for each component and the names for colors, textures and positions are synonymous. GLSL works around this by naming the components of the texture s, t, p and q. Cogl already effectively already exposes this naming because it exposes GLSL so it makes sense to use that naming consistently. Another alternative could be u, v and w. This is what Blender and Direct3D use. However the w component conflicts with the w component of a position vertex.
2010-07-12 12:01:32 -04:00
tex_3d->wrap_mode_p = wrap_mode_p;
Add a Cogl texture 3D backend This adds a publicly exposed experimental API for a 3D texture backend. There is a feature flag which can be checked for whether 3D textures are supported. Although we require OpenGL 1.2 which has 3D textures in core, GLES only provides them through an extension so the feature can be used to detect that. The textures can be created with one of two new API functions :- cogl_texture_3d_new_with_size and cogl_texture_3d_new_from_data There is also internally a new_from_bitmap function. new_from_data is implemented in terms of this function. The two constructors are effectively the only way to upload data to a 3D texture. It does not work to call glTexImage2D with the GL_TEXTURE_3D target so the virtual for cogl_texture_set_region does nothing. It would be possible to make cogl_texture_get_data do something sensible like returning all of the images as a single long image but this is not currently implemented and instead the virtual just always fails. We may want to add API specific to the 3D texture backend to get and set a sub region of the texture. All of those three functions can throw a GError. This will happen if the GPU does not support 3D textures or it does not support NPOTs and an NPOT size is requested. It will also fail if the FBO extension is not supported and the COGL_TEXTURE_NO_AUTO_MIPMAP flag is not given. This could be avoided by copying the code for the GL_GENERATE_MIPMAP TexParameter fallback, but in the interests of keeping the code simple this is not yet done. This adds a couple of functions to cogl-texture-driver for uploading 3D data and querying the 3D proxy texture. prep_gl_for_pixels_upload_full now also takes sets the GL_UNPACK_IMAGE_HEIGHT parameter so that 3D textures can have padding between the images. Whenever 3D texture is uploading, both the height of the images and the height of all of the data is specified (either explicitly or implicilty from the CoglBitmap) so that the image height can be deduced by dividing by the depth.
2010-07-01 17:04:59 -04:00
}
}
static void
_cogl_texture_3d_free (CoglTexture3D *tex_3d)
{
_cogl_delete_gl_texture (tex_3d->gl_texture);
/* Chain up */
_cogl_texture_free (COGL_TEXTURE (tex_3d));
}
static CoglTexture3D *
_cogl_texture_3d_create_base (unsigned int width,
unsigned int height,
unsigned int depth,
CoglTextureFlags flags,
CoglPixelFormat internal_format)
{
CoglTexture3D *tex_3d = g_new (CoglTexture3D, 1);
CoglTexture *tex = COGL_TEXTURE (tex_3d);
tex->vtable = &cogl_texture_3d_vtable;
tex_3d->width = width;
tex_3d->height = height;
tex_3d->depth = depth;
tex_3d->mipmaps_dirty = TRUE;
tex_3d->auto_mipmap = (flags & COGL_TEXTURE_NO_AUTO_MIPMAP) == 0;
/* We default to GL_LINEAR for both filters */
tex_3d->min_filter = GL_LINEAR;
tex_3d->mag_filter = GL_LINEAR;
/* Wrap mode not yet set */
tex_3d->wrap_mode_s = GL_FALSE;
tex_3d->wrap_mode_t = GL_FALSE;
Rename the third texure coordinate from 'r' to 'p' Using 'r' to name the third component is problematic because that is commonly used to represent the red component of a vector representing a color. Under GLSL this is awkward because the texture swizzling for a vector uses a single letter for each component and the names for colors, textures and positions are synonymous. GLSL works around this by naming the components of the texture s, t, p and q. Cogl already effectively already exposes this naming because it exposes GLSL so it makes sense to use that naming consistently. Another alternative could be u, v and w. This is what Blender and Direct3D use. However the w component conflicts with the w component of a position vertex.
2010-07-12 12:01:32 -04:00
tex_3d->wrap_mode_p = GL_FALSE;
Add a Cogl texture 3D backend This adds a publicly exposed experimental API for a 3D texture backend. There is a feature flag which can be checked for whether 3D textures are supported. Although we require OpenGL 1.2 which has 3D textures in core, GLES only provides them through an extension so the feature can be used to detect that. The textures can be created with one of two new API functions :- cogl_texture_3d_new_with_size and cogl_texture_3d_new_from_data There is also internally a new_from_bitmap function. new_from_data is implemented in terms of this function. The two constructors are effectively the only way to upload data to a 3D texture. It does not work to call glTexImage2D with the GL_TEXTURE_3D target so the virtual for cogl_texture_set_region does nothing. It would be possible to make cogl_texture_get_data do something sensible like returning all of the images as a single long image but this is not currently implemented and instead the virtual just always fails. We may want to add API specific to the 3D texture backend to get and set a sub region of the texture. All of those three functions can throw a GError. This will happen if the GPU does not support 3D textures or it does not support NPOTs and an NPOT size is requested. It will also fail if the FBO extension is not supported and the COGL_TEXTURE_NO_AUTO_MIPMAP flag is not given. This could be avoided by copying the code for the GL_GENERATE_MIPMAP TexParameter fallback, but in the interests of keeping the code simple this is not yet done. This adds a couple of functions to cogl-texture-driver for uploading 3D data and querying the 3D proxy texture. prep_gl_for_pixels_upload_full now also takes sets the GL_UNPACK_IMAGE_HEIGHT parameter so that 3D textures can have padding between the images. Whenever 3D texture is uploading, both the height of the images and the height of all of the data is specified (either explicitly or implicilty from the CoglBitmap) so that the image height can be deduced by dividing by the depth.
2010-07-01 17:04:59 -04:00
tex_3d->format = internal_format;
return tex_3d;
}
static gboolean
_cogl_texture_3d_can_create (unsigned int width,
unsigned int height,
unsigned int depth,
CoglTextureFlags flags,
CoglPixelFormat internal_format,
GError **error)
{
GLenum gl_intformat;
GLenum gl_type;
/* This should only happen on GLES */
if (!cogl_features_available (COGL_FEATURE_TEXTURE_3D))
{
g_set_error (error,
COGL_ERROR,
COGL_ERROR_UNSUPPORTED,
"3D textures are not supported by the GPU");
return FALSE;
}
/* If NPOT textures aren't supported then the size must be a power
of two */
if (!cogl_features_available (COGL_FEATURE_TEXTURE_NPOT) &&
(!_cogl_util_is_pot (width) ||
!_cogl_util_is_pot (height) ||
!_cogl_util_is_pot (depth)))
{
g_set_error (error,
COGL_ERROR,
COGL_ERROR_UNSUPPORTED,
"A non-power-of-two size was requested but this is not "
"supported by the GPU");
return FALSE;
}
_cogl_pixel_format_to_gl (internal_format,
&gl_intformat,
NULL,
&gl_type);
/* Check that the driver can create a texture with that size */
if (!_cogl_texture_driver_size_supported_3d (GL_TEXTURE_3D,
gl_intformat,
gl_type,
width,
height,
depth))
{
g_set_error (error,
COGL_ERROR,
COGL_ERROR_UNSUPPORTED,
"The requested dimensions are not supported by the GPU");
return FALSE;
}
return TRUE;
}
CoglHandle
cogl_texture_3d_new_with_size (unsigned int width,
unsigned int height,
unsigned int depth,
CoglTextureFlags flags,
CoglPixelFormat internal_format,
GError **error)
{
CoglTexture3D *tex_3d;
GLenum gl_intformat;
GLenum gl_format;
GLenum gl_type;
_COGL_GET_CONTEXT (ctx, COGL_INVALID_HANDLE);
/* Since no data, we need some internal format */
if (internal_format == COGL_PIXEL_FORMAT_ANY)
internal_format = COGL_PIXEL_FORMAT_RGBA_8888_PRE;
if (!_cogl_texture_3d_can_create (width, height, depth,
flags, internal_format,
error))
return COGL_INVALID_HANDLE;
internal_format = _cogl_pixel_format_to_gl (internal_format,
&gl_intformat,
&gl_format,
&gl_type);
tex_3d = _cogl_texture_3d_create_base (width, height, depth,
flags, internal_format);
_cogl_texture_driver_gen (GL_TEXTURE_3D, 1, &tex_3d->gl_texture);
_cogl_bind_gl_texture_transient (GL_TEXTURE_3D,
tex_3d->gl_texture,
FALSE);
GE( glTexImage3D (GL_TEXTURE_3D, 0, gl_intformat,
width, height, depth, 0, gl_format, gl_type, NULL) );
return _cogl_texture_3d_handle_new (tex_3d);
}
CoglHandle
_cogl_texture_3d_new_from_bitmap (CoglHandle bmp_handle,
unsigned int height,
unsigned int depth,
CoglTextureFlags flags,
CoglPixelFormat internal_format,
GError **error)
{
CoglTexture3D *tex_3d;
CoglBitmap *bmp = (CoglBitmap *) bmp_handle;
CoglBitmap dst_bmp;
gboolean dst_bmp_owner;
GLenum gl_intformat;
GLenum gl_format;
GLenum gl_type;
_COGL_GET_CONTEXT (ctx, COGL_INVALID_HANDLE);
internal_format = _cogl_texture_determine_internal_format (bmp->format,
internal_format);
if (!_cogl_texture_3d_can_create (bmp->width, height, depth,
flags, internal_format,
error))
return COGL_INVALID_HANDLE;
if (!_cogl_texture_prepare_for_upload (bmp,
internal_format,
&internal_format,
&dst_bmp,
&dst_bmp_owner,
&gl_intformat,
&gl_format,
&gl_type))
{
g_set_error (error, COGL_BITMAP_ERROR, COGL_BITMAP_ERROR_FAILED,
"Bitmap conversion failed");
return COGL_INVALID_HANDLE;
}
tex_3d = _cogl_texture_3d_create_base (dst_bmp.width, height, depth,
flags, internal_format);
Add a GL_GENERATE_MIPMAP fallback to the texture 2d and 3d backends The CoglTexture2DSliced backend has a fallback for when the framebuffer extension is missing so it's not possible to use glGenerateMipmap. This involves keeping a copy of the upper-left pixel of the tex image so that we can temporarily enable GL_GENERATE_MIPMAP on the texture object and do a sub texture update by reuploading the contents of the first pixel. This patch copies that mechanism to the 2D and 3D backends. The CoglTexturePixel structure which was previously internal to the sliced backend has been moved to cogl-texture-private.h so that it can be shared.
2010-07-13 13:41:01 -04:00
/* Keep a copy of the first pixel so that if glGenerateMipmap isn't
supported we can fallback to using GL_GENERATE_MIPMAP */
tex_3d->first_pixel.gl_format = gl_format;
tex_3d->first_pixel.gl_type = gl_type;
memcpy (tex_3d->first_pixel.data, dst_bmp.data,
_cogl_get_format_bpp (dst_bmp.format));
Add a Cogl texture 3D backend This adds a publicly exposed experimental API for a 3D texture backend. There is a feature flag which can be checked for whether 3D textures are supported. Although we require OpenGL 1.2 which has 3D textures in core, GLES only provides them through an extension so the feature can be used to detect that. The textures can be created with one of two new API functions :- cogl_texture_3d_new_with_size and cogl_texture_3d_new_from_data There is also internally a new_from_bitmap function. new_from_data is implemented in terms of this function. The two constructors are effectively the only way to upload data to a 3D texture. It does not work to call glTexImage2D with the GL_TEXTURE_3D target so the virtual for cogl_texture_set_region does nothing. It would be possible to make cogl_texture_get_data do something sensible like returning all of the images as a single long image but this is not currently implemented and instead the virtual just always fails. We may want to add API specific to the 3D texture backend to get and set a sub region of the texture. All of those three functions can throw a GError. This will happen if the GPU does not support 3D textures or it does not support NPOTs and an NPOT size is requested. It will also fail if the FBO extension is not supported and the COGL_TEXTURE_NO_AUTO_MIPMAP flag is not given. This could be avoided by copying the code for the GL_GENERATE_MIPMAP TexParameter fallback, but in the interests of keeping the code simple this is not yet done. This adds a couple of functions to cogl-texture-driver for uploading 3D data and querying the 3D proxy texture. prep_gl_for_pixels_upload_full now also takes sets the GL_UNPACK_IMAGE_HEIGHT parameter so that 3D textures can have padding between the images. Whenever 3D texture is uploading, both the height of the images and the height of all of the data is specified (either explicitly or implicilty from the CoglBitmap) so that the image height can be deduced by dividing by the depth.
2010-07-01 17:04:59 -04:00
_cogl_texture_driver_gen (GL_TEXTURE_3D, 1, &tex_3d->gl_texture);
_cogl_texture_driver_upload_to_gl_3d (GL_TEXTURE_3D,
tex_3d->gl_texture,
FALSE, /* is_foreign */
height,
depth,
&dst_bmp,
gl_intformat,
gl_format,
gl_type);
tex_3d->gl_format = gl_intformat;
if (dst_bmp_owner)
g_free (dst_bmp.data);
return _cogl_texture_3d_handle_new (tex_3d);
}
CoglHandle
cogl_texture_3d_new_from_data (unsigned int width,
unsigned int height,
unsigned int depth,
CoglTextureFlags flags,
CoglPixelFormat format,
CoglPixelFormat internal_format,
unsigned int rowstride,
unsigned int image_stride,
const guint8 *data,
GError **error)
{
CoglBitmap bitmap;
gboolean bitmap_owned = FALSE;
CoglHandle ret;
/* These are considered a programmer errors so we won't set a
GError. It would be nice if this was a g_return_if_fail but the
rest of Cogl isn't using that */
if (format == COGL_PIXEL_FORMAT_ANY)
return COGL_INVALID_HANDLE;
if (data == NULL)
return COGL_INVALID_HANDLE;
/* Rowstride from width if not given */
if (rowstride == 0)
rowstride = width * _cogl_get_format_bpp (format);
/* Image stride from height and rowstride if not given */
if (image_stride == 0)
image_stride = height * rowstride;
if (image_stride < rowstride * height)
return COGL_INVALID_HANDLE;
/* GL doesn't support uploading when the image_stride isn't a
multiple of the rowstride. If this happens we'll just pack the
image into a new bitmap. The documentation for this function
recommends avoiding this situation. */
if (image_stride % rowstride != 0)
{
int z, y;
bitmap.width = width;
bitmap.height = depth * height;
bitmap.rowstride = _cogl_get_format_bpp (format) * width;
bitmap.data = g_malloc (bitmap.rowstride * height * depth);
bitmap.format = format;
/* Copy all of the images in */
for (z = 0; z < depth; z++)
for (y = 0; y < height; y++)
memcpy (bitmap.data + (z * bitmap.rowstride * height +
bitmap.rowstride * y),
data + z * image_stride + rowstride * y,
bitmap.rowstride);
bitmap_owned = TRUE;
}
else
{
/* Wrap the data into a bitmap */
bitmap.width = width;
bitmap.height = image_stride / rowstride * depth;
bitmap.data = (guint8 *) data;
bitmap.format = format;
bitmap.rowstride = rowstride;
}
ret = _cogl_texture_3d_new_from_bitmap (&bitmap,
height,
depth,
flags,
internal_format,
error);
if (bitmap_owned)
g_free (bitmap.data);
return ret;
}
GQuark
cogl_texture_3d_error_quark (void)
{
return g_quark_from_static_string ("cogl-texture-3d-error-quark");
}
static int
_cogl_texture_3d_get_max_waste (CoglTexture *tex)
{
return -1;
}
static gboolean
_cogl_texture_3d_is_sliced (CoglTexture *tex)
{
return FALSE;
}
static gboolean
_cogl_texture_3d_can_hardware_repeat (CoglTexture *tex)
{
return TRUE;
}
static void
_cogl_texture_3d_transform_coords_to_gl (CoglTexture *tex,
float *s,
float *t)
{
/* The texture coordinates map directly so we don't need to do
anything */
}
static CoglTransformResult
_cogl_texture_3d_transform_quad_coords_to_gl (CoglTexture *tex,
float *coords)
{
/* The texture coordinates map directly so we don't need to do
anything other than check for repeats */
gboolean need_repeat = FALSE;
int i;
for (i = 0; i < 4; i++)
if (coords[i] < 0.0f || coords[i] > 1.0f)
need_repeat = TRUE;
return (need_repeat ? COGL_TRANSFORM_HARDWARE_REPEAT
: COGL_TRANSFORM_NO_REPEAT);
}
static gboolean
_cogl_texture_3d_get_gl_texture (CoglTexture *tex,
GLuint *out_gl_handle,
GLenum *out_gl_target)
{
CoglTexture3D *tex_3d = COGL_TEXTURE_3D (tex);
if (out_gl_handle)
*out_gl_handle = tex_3d->gl_texture;
if (out_gl_target)
*out_gl_target = GL_TEXTURE_3D;
return TRUE;
}
static void
_cogl_texture_3d_set_filters (CoglTexture *tex,
GLenum min_filter,
GLenum mag_filter)
{
CoglTexture3D *tex_3d = COGL_TEXTURE_3D (tex);
if (min_filter == tex_3d->min_filter
&& mag_filter == tex_3d->mag_filter)
return;
/* Store new values */
tex_3d->min_filter = min_filter;
tex_3d->mag_filter = mag_filter;
/* Apply new filters to the texture */
_cogl_bind_gl_texture_transient (GL_TEXTURE_3D,
tex_3d->gl_texture,
FALSE);
GE( glTexParameteri (GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, mag_filter) );
GE( glTexParameteri (GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, min_filter) );
}
static void
_cogl_texture_3d_pre_paint (CoglTexture *tex, CoglTexturePrePaintFlags flags)
{
CoglTexture3D *tex_3d = COGL_TEXTURE_3D (tex);
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
/* Only update if the mipmaps are dirty */
if ((flags & COGL_TEXTURE_NEEDS_MIPMAP) &&
tex_3d->auto_mipmap && tex_3d->mipmaps_dirty)
{
_cogl_bind_gl_texture_transient (GL_TEXTURE_3D,
tex_3d->gl_texture,
FALSE);
Add a GL_GENERATE_MIPMAP fallback to the texture 2d and 3d backends The CoglTexture2DSliced backend has a fallback for when the framebuffer extension is missing so it's not possible to use glGenerateMipmap. This involves keeping a copy of the upper-left pixel of the tex image so that we can temporarily enable GL_GENERATE_MIPMAP on the texture object and do a sub texture update by reuploading the contents of the first pixel. This patch copies that mechanism to the 2D and 3D backends. The CoglTexturePixel structure which was previously internal to the sliced backend has been moved to cogl-texture-private.h so that it can be shared.
2010-07-13 13:41:01 -04:00
/* glGenerateMipmap is defined in the FBO extension. If it's not
available we'll fallback to temporarily enabling
GL_GENERATE_MIPMAP and reuploading the first pixel */
if (cogl_features_available (COGL_FEATURE_OFFSCREEN))
_cogl_texture_driver_gl_generate_mipmaps (GL_TEXTURE_3D);
else
{
GE( glTexParameteri (GL_TEXTURE_3D,
GL_GENERATE_MIPMAP,
GL_TRUE) );
GE( glTexSubImage3D (GL_TEXTURE_3D,
0, /* level */
0, /* xoffset */
0, /* yoffset */
0, /* zoffset */
1, /* width */
1, /* height */
1, /* depth */
tex_3d->first_pixel.gl_format,
tex_3d->first_pixel.gl_type,
tex_3d->first_pixel.data) );
GE( glTexParameteri (GL_TEXTURE_3D,
GL_GENERATE_MIPMAP,
GL_FALSE) );
}
Add a Cogl texture 3D backend This adds a publicly exposed experimental API for a 3D texture backend. There is a feature flag which can be checked for whether 3D textures are supported. Although we require OpenGL 1.2 which has 3D textures in core, GLES only provides them through an extension so the feature can be used to detect that. The textures can be created with one of two new API functions :- cogl_texture_3d_new_with_size and cogl_texture_3d_new_from_data There is also internally a new_from_bitmap function. new_from_data is implemented in terms of this function. The two constructors are effectively the only way to upload data to a 3D texture. It does not work to call glTexImage2D with the GL_TEXTURE_3D target so the virtual for cogl_texture_set_region does nothing. It would be possible to make cogl_texture_get_data do something sensible like returning all of the images as a single long image but this is not currently implemented and instead the virtual just always fails. We may want to add API specific to the 3D texture backend to get and set a sub region of the texture. All of those three functions can throw a GError. This will happen if the GPU does not support 3D textures or it does not support NPOTs and an NPOT size is requested. It will also fail if the FBO extension is not supported and the COGL_TEXTURE_NO_AUTO_MIPMAP flag is not given. This could be avoided by copying the code for the GL_GENERATE_MIPMAP TexParameter fallback, but in the interests of keeping the code simple this is not yet done. This adds a couple of functions to cogl-texture-driver for uploading 3D data and querying the 3D proxy texture. prep_gl_for_pixels_upload_full now also takes sets the GL_UNPACK_IMAGE_HEIGHT parameter so that 3D textures can have padding between the images. Whenever 3D texture is uploading, both the height of the images and the height of all of the data is specified (either explicitly or implicilty from the CoglBitmap) so that the image height can be deduced by dividing by the depth.
2010-07-01 17:04:59 -04:00
tex_3d->mipmaps_dirty = FALSE;
}
}
static void
_cogl_texture_3d_ensure_non_quad_rendering (CoglTexture *tex)
{
/* Nothing needs to be done */
}
static gboolean
_cogl_texture_3d_set_region (CoglTexture *tex,
int src_x,
int src_y,
int dst_x,
int dst_y,
unsigned int dst_width,
unsigned int dst_height,
CoglBitmap *bmp)
{
/* This function doesn't really make sense for 3D textures because
it can't specify which image to upload to */
return FALSE;
}
static int
_cogl_texture_3d_get_data (CoglTexture *tex,
CoglPixelFormat format,
unsigned int rowstride,
guint8 *data)
{
/* FIXME: we could probably implement this by assuming the data is
big enough to hold all of the images and that there is no stride
between the images. However it would be better to have an API
that can provide an image stride and this function probably isn't
particularly useful anyway so for now it just reports failure */
return 0;
}
static CoglPixelFormat
_cogl_texture_3d_get_format (CoglTexture *tex)
{
return COGL_TEXTURE_3D (tex)->format;
}
static GLenum
_cogl_texture_3d_get_gl_format (CoglTexture *tex)
{
return COGL_TEXTURE_3D (tex)->gl_format;
}
static int
_cogl_texture_3d_get_width (CoglTexture *tex)
{
return COGL_TEXTURE_3D (tex)->width;
}
static int
_cogl_texture_3d_get_height (CoglTexture *tex)
{
return COGL_TEXTURE_3D (tex)->height;
}
static const CoglTextureVtable
cogl_texture_3d_vtable =
{
_cogl_texture_3d_set_region,
_cogl_texture_3d_get_data,
_cogl_texture_3d_foreach_sub_texture_in_region,
_cogl_texture_3d_get_max_waste,
_cogl_texture_3d_is_sliced,
_cogl_texture_3d_can_hardware_repeat,
_cogl_texture_3d_transform_coords_to_gl,
_cogl_texture_3d_transform_quad_coords_to_gl,
_cogl_texture_3d_get_gl_texture,
_cogl_texture_3d_set_filters,
_cogl_texture_3d_pre_paint,
_cogl_texture_3d_ensure_non_quad_rendering,
_cogl_texture_3d_set_wrap_mode_parameters,
_cogl_texture_3d_get_format,
_cogl_texture_3d_get_gl_format,
_cogl_texture_3d_get_width,
_cogl_texture_3d_get_height,
NULL /* is_foreign */
};
Reference in New Issue Copy Permalink