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0f5f4e8645
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.
587 lines
21 KiB
C
587 lines
21 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2007,2008,2009,2010 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#if !defined(__COGL_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
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#error "Only <cogl/cogl.h> can be included directly."
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#endif
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#ifndef __COGL_TEXTURE_H__
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#define __COGL_TEXTURE_H__
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#include <cogl/cogl-types.h>
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#include <cogl/cogl-defines.h>
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G_BEGIN_DECLS
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/**
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* SECTION:cogl-texture
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* @short_description: Fuctions for creating and manipulating textures
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*
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* COGL allows creating and manipulating GL textures using a uniform
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* API that tries to hide all the various complexities of creating,
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* loading and manipulating textures.
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*/
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#define COGL_TEXTURE_MAX_WASTE 127
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/**
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* cogl_texture_new_with_size:
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* @width: width of texture in pixels.
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* @height: height of texture in pixels.
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* @flags: Optional flags for the texture, or %COGL_TEXTURE_NONE
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* @internal_format: the #CoglPixelFormat to use for the GPU storage of the
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* texture.
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*
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* Creates a new COGL texture with the specified dimensions and pixel format.
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*
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* Return value: a #CoglHandle to the newly created texture or
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* %COGL_INVALID_HANDLE on failure
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*
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* Since: 0.8
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*/
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CoglHandle
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cogl_texture_new_with_size (unsigned int width,
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unsigned int height,
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CoglTextureFlags flags,
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CoglPixelFormat internal_format);
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/**
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* cogl_texture_new_from_file:
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* @filename: the file to load
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* @flags: Optional flags for the texture, or %COGL_TEXTURE_NONE
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* @internal_format: the #CoglPixelFormat to use for the GPU storage of the
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* texture. If %COGL_PIXEL_FORMAT_ANY is given then a premultiplied
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* format similar to the format of the source data will be used. The
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* default blending equations of Cogl expect premultiplied color data;
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* the main use of passing a non-premultiplied format here is if you
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* have non-premultiplied source data and are going to adjust the blend
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* mode (see cogl_material_set_blend()) or use the data for something
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* other than straight blending.
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* @error: return location for a #GError or %NULL
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*
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* Creates a COGL texture from an image file.
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*
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* Return value: a #CoglHandle to the newly created texture or
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* %COGL_INVALID_HANDLE on failure
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*
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* Since: 0.8
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*/
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CoglHandle
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cogl_texture_new_from_file (const char *filename,
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CoglTextureFlags flags,
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CoglPixelFormat internal_format,
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GError **error);
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/**
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* cogl_texture_new_from_data:
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* @width: width of texture in pixels
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* @height: height of texture in pixels
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* @flags: Optional flags for the texture, or %COGL_TEXTURE_NONE
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* @format: the #CoglPixelFormat the buffer is stored in in RAM
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* @internal_format: the #CoglPixelFormat that will be used for storing
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* the buffer on the GPU. If COGL_PIXEL_FORMAT_ANY is given then a
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* premultiplied format similar to the format of the source data will
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* be used. The default blending equations of Cogl expect premultiplied
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* color data; the main use of passing a non-premultiplied format here
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* is if you have non-premultiplied source data and are going to adjust
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* the blend mode (see cogl_material_set_blend()) or use the data for
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* something other than straight blending.
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* @rowstride: the memory offset in bytes between the starts of
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* scanlines in @data
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* @data: pointer the memory region where the source buffer resides
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*
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* Creates a new COGL texture based on data residing in memory.
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*
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* Return value: a #CoglHandle to the newly created texture or
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* %COGL_INVALID_HANDLE on failure
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*
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* Since: 0.8
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*/
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CoglHandle
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cogl_texture_new_from_data (unsigned int width,
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unsigned int height,
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CoglTextureFlags flags,
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CoglPixelFormat format,
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CoglPixelFormat internal_format,
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unsigned int rowstride,
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const guint8 *data);
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/**
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* cogl_texture_new_from_foreign:
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* @gl_handle: opengl handle of foreign texture.
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* @gl_target: opengl target type of foreign texture
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* @width: width of foreign texture
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* @height: height of foreign texture.
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* @x_pot_waste: maximum horizontal waste.
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* @y_pot_waste: maximum vertical waste.
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* @format: format of the foreign texture.
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*
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* Creates a COGL texture based on an existing OpenGL texture; the
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* width, height and format are passed along since it is not possible
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* to query this from a handle with GLES 1.0.
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*
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* Return value: a #CoglHandle to the newly created texture or
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* %COGL_INVALID_HANDLE on failure
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*
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* Since: 0.8
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*/
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CoglHandle
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cogl_texture_new_from_foreign (GLuint gl_handle,
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GLenum gl_target,
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GLuint width,
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GLuint height,
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GLuint x_pot_waste,
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GLuint y_pot_waste,
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CoglPixelFormat format);
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/**
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* cogl_texture_new_from_bitmap:
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* @bmp_handle: A CoglBitmap handle
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* @flags: Optional flags for the texture, or %COGL_TEXTURE_NONE
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* @internal_format: the #CoglPixelFormat to use for the GPU storage of the
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* texture
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*
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* Creates a COGL texture from a CoglBitmap.
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*
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* Return value: a #CoglHandle to the newly created texture or
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* %COGL_INVALID_HANDLE on failure
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*
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* Since: 1.0
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*/
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CoglHandle
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cogl_texture_new_from_bitmap (CoglHandle bmp_handle,
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CoglTextureFlags flags,
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CoglPixelFormat internal_format);
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/**
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* cogl_is_texture:
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* @handle: A CoglHandle
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*
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* Gets whether the given handle references an existing texture object.
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*
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* Return value: %TRUE if the handle references a texture, and
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* %FALSE otherwise
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*/
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gboolean
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cogl_is_texture (CoglHandle handle);
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/**
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* cogl_texture_get_width:
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* @handle: a #CoglHandle for a texture.
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*
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* Queries the width of a cogl texture.
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*
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* Return value: the width of the GPU side texture in pixels
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*/
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unsigned int
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cogl_texture_get_width (CoglHandle handle);
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/**
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* cogl_texture_get_height:
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* @handle: a #CoglHandle for a texture.
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*
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* Queries the height of a cogl texture.
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*
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* Return value: the height of the GPU side texture in pixels
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*/
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unsigned int
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cogl_texture_get_height (CoglHandle handle);
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/**
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* cogl_texture_get_format:
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* @handle: a #CoglHandle for a texture.
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*
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* Queries the #CoglPixelFormat of a cogl texture.
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*
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* Return value: the #CoglPixelFormat of the GPU side texture
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*/
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CoglPixelFormat
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cogl_texture_get_format (CoglHandle handle);
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/**
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* cogl_texture_get_rowstride:
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* @handle: a #CoglHandle for a texture.
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*
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* Queries the rowstride of a cogl texture.
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*
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* Return value: the offset in bytes between each consequetive row of pixels
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*/
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unsigned int
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cogl_texture_get_rowstride (CoglHandle handle);
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/**
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* cogl_texture_get_max_waste:
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* @handle: a #CoglHandle for a texture.
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*
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* Queries the maximum wasted (unused) pixels in one dimension of a GPU side
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* texture.
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*
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* Return value: the maximum waste
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*/
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int
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cogl_texture_get_max_waste (CoglHandle handle);
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/**
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* cogl_texture_is_sliced:
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* @handle: a #CoglHandle for a texture.
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*
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* Queries if a texture is sliced (stored as multiple GPU side tecture
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* objects).
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*
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* Return value: %TRUE if the texture is sliced, %FALSE if the texture
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* is stored as a single GPU texture
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*/
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gboolean
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cogl_texture_is_sliced (CoglHandle handle);
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/**
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* cogl_texture_get_gl_texture:
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* @handle: a #CoglHandle for a texture.
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* @out_gl_handle: (out) (allow-none): pointer to return location for the
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* textures GL handle, or %NULL.
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* @out_gl_target: (out) (allow-none): pointer to return location for the
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* GL target type, or %NULL.
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*
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* Queries the GL handles for a GPU side texture through its #CoglHandle.
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*
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* If the texture is spliced the data for the first sub texture will be
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* queried.
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*
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* Return value: %TRUE if the handle was successfully retrieved, %FALSE
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* if the handle was invalid
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*/
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gboolean
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cogl_texture_get_gl_texture (CoglHandle handle,
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GLuint *out_gl_handle,
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GLenum *out_gl_target);
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/**
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* cogl_texture_get_data:
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* @handle: a #CoglHandle for a texture.
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* @format: the #CoglPixelFormat to store the texture as.
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* @rowstride: the rowstride of @data or retrieved from texture if none is
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* specified.
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* @data: memory location to write contents of buffer, or %NULL if we're
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* only querying the data size through the return value.
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*
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* Copies the pixel data from a cogl texture to system memory.
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*
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* Return value: the size of the texture data in bytes, or 0 if the texture
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* is not valid
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*/
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int
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cogl_texture_get_data (CoglHandle handle,
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CoglPixelFormat format,
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unsigned int rowstride,
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guint8 *data);
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/**
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* cogl_texture_set_region:
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* @handle: a #CoglHandle.
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* @src_x: upper left coordinate to use from source data.
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* @src_y: upper left coordinate to use from source data.
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* @dst_x: upper left destination horizontal coordinate.
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* @dst_y: upper left destination vertical coordinate.
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* @dst_width: width of destination region to write.
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* @dst_height: height of destination region to write.
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* @width: width of source data buffer.
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* @height: height of source data buffer.
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* @format: the #CoglPixelFormat used in the source buffer.
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* @rowstride: rowstride of source buffer (computed from width if none
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* specified)
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* @data: the actual pixel data.
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*
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* Sets the pixels in a rectangular subregion of @handle from an in-memory
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* buffer containing pixel data.
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*
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* Return value: %TRUE if the subregion upload was successful, and
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* %FALSE otherwise
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*/
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gboolean
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cogl_texture_set_region (CoglHandle handle,
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int src_x,
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int src_y,
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int dst_x,
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int dst_y,
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unsigned int dst_width,
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unsigned int dst_height,
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int width,
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int height,
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CoglPixelFormat format,
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unsigned int rowstride,
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const guint8 *data);
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/**
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* cogl_texture_new_from_sub_texture:
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* @full_texture: a #CoglHandle to an existing texture
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* @sub_x: X coordinate of the top-left of the subregion
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* @sub_y: Y coordinate of the top-left of the subregion
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* @sub_width: Width in pixels of the subregion
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* @sub_height: Height in pixels of the subregion
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*
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* Creates a new texture which represents a subregion of another
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* texture. The GL resources will be shared so that no new texture
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* data is actually allocated.
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*
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* Sub textures have undefined behaviour texture coordinates outside
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* of the range [0,1] are used. They also do not work with
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* CoglVertexBuffers.
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*
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* Return value: a #CoglHandle to the new texture.
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*
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* Since: 1.2
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*/
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CoglHandle
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cogl_texture_new_from_sub_texture (CoglHandle full_texture,
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int sub_x,
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int sub_y,
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int sub_width,
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int sub_height);
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#if defined (COGL_ENABLE_EXPERIMENTAL_API)
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/**
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* cogl_texture_new_from_buffer:
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* @buffer: the #CoglHandle of a pixel buffer
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* @width: width of texture in pixels or 0
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* @height: height of texture in pixels or 0
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* @flags: optional flags for the texture, or %COGL_TEXTURE_NONE
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* @format: the #CoglPixelFormat the buffer is stored in in RAM
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* @internal_format: the #CoglPixelFormat that will be used for storing
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* the buffer on the GPU. If %COGL_PIXEL_FORMAT_ANY is given then a
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* premultiplied format similar to the format of the source data will
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* be used. The default blending equations of Cogl expect premultiplied
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* color data; the main use of passing a non-premultiplied format here
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* is if you have non-premultiplied source data and are going to adjust
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* the blend mode (see cogl_material_set_blend()) or use the data for
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* something other than straight blending
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* @rowstride: the memory offset in bytes between the starts of
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* scanlines in @data. If 0 is given the row stride will be deduced from
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* @width and @format or the stride given by cogl_pixel_buffer_new_for_size()
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* @offset: offset in bytes in @buffer from where the texture data starts
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*
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* Creates a new texture using the buffer specified by @handle. If the buffer
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* has been created using cogl_pixel_buffer_new_for_size() it's possible to omit
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* the height and width values already specified at creation time.
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*
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* Return value: a #CoglHandle to the new texture or %COGL_INVALID_HANDLE on
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* failure
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*
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* Since: 1.2
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* Stability: Unstable
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*/
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CoglHandle
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cogl_texture_new_from_buffer (CoglHandle buffer,
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unsigned int width,
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unsigned int height,
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CoglTextureFlags flags,
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CoglPixelFormat format,
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CoglPixelFormat internal_format,
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unsigned int rowstride,
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unsigned int offset);
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/* the function above is experimental, the actual symbol is suffixed by _EXP so
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* we can ensure ABI compatibility and leave the cogl_buffer namespace free for
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* future use. A bunch of defines translates the symbols documented above into
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* the real symbols */
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CoglHandle
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cogl_texture_new_from_buffer_EXP (CoglHandle buffer,
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unsigned int width,
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unsigned int height,
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CoglTextureFlags flags,
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CoglPixelFormat format,
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CoglPixelFormat internal_format,
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unsigned int rowstride,
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unsigned int offset);
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#define cogl_texture_new_from_buffer cogl_texture_new_from_buffer_EXP
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#endif
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#ifndef COGL_DISABLE_DEPRECATED
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/**
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* cogl_texture_ref:
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* @handle: a @CoglHandle.
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*
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* Increment the reference count for a cogl texture.
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*
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* Deprecated: 1.2: Use cogl_handle_ref() instead
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*
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* Return value: the @handle.
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*/
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CoglHandle
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cogl_texture_ref (CoglHandle handle);
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/**
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* cogl_texture_unref:
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* @handle: a @CoglHandle.
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*
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* Decrement the reference count for a cogl texture.
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*
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* Deprecated: 1.2: Use cogl_handle_unref() instead
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*/
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void
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cogl_texture_unref (CoglHandle handle);
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#endif /* COGL_DISABLE_DEPRECATED */
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/**
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* cogl_rectangle_with_texture_coords:
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* @x1: x coordinate upper left on screen.
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* @y1: y coordinate upper left on screen.
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* @x2: x coordinate lower right on screen.
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* @y2: y coordinate lower right on screen.
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* @tx1: x part of texture coordinate to use for upper left pixel
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* @ty1: y part of texture coordinate to use for upper left pixel
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* @tx2: x part of texture coordinate to use for lower right pixel
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* @ty2: y part of texture coordinate to use for left pixel
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*
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* Draw a rectangle using the current material and supply texture coordinates
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* to be used for the first texture layer of the material. To draw the entire
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* texture pass in @tx1=0.0 @ty1=0.0 @tx2=1.0 @ty2=1.0.
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*
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* Since: 1.0
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*/
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void
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cogl_rectangle_with_texture_coords (float x1,
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float y1,
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float x2,
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float y2,
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float tx1,
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float ty1,
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float tx2,
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float ty2);
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/**
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* cogl_rectangle_with_multitexture_coords:
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* @x1: x coordinate upper left on screen.
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* @y1: y coordinate upper left on screen.
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* @x2: x coordinate lower right on screen.
|
|
* @y2: y coordinate lower right on screen.
|
|
* @tex_coords: (in) (array) (transfer none): An array containing groups of
|
|
* 4 float values: [tx1, ty1, tx2, ty2] that are interpreted as two texture
|
|
* coordinates; one for the upper left texel, and one for the lower right
|
|
* texel. Each value should be between 0.0 and 1.0, where the coordinate
|
|
* (0.0, 0.0) represents the top left of the texture, and (1.0, 1.0) the
|
|
* bottom right.
|
|
* @tex_coords_len: The length of the tex_coords array. (e.g. for one layer
|
|
* and one group of texture coordinates, this would be 4)
|
|
*
|
|
* This function draws a rectangle using the current source material to
|
|
* texture or fill with. As a material may contain multiple texture layers
|
|
* this interface lets you supply texture coordinates for each layer of the
|
|
* material.
|
|
*
|
|
* The first pair of coordinates are for the first layer (with the smallest
|
|
* layer index) and if you supply less texture coordinates than there are
|
|
* layers in the current source material then default texture coordinates
|
|
* (0.0, 0.0, 1.0, 1.0) are generated.
|
|
*
|
|
* Since: 1.0
|
|
*/
|
|
void
|
|
cogl_rectangle_with_multitexture_coords (float x1,
|
|
float y1,
|
|
float x2,
|
|
float y2,
|
|
const float *tex_coords,
|
|
int tex_coords_len);
|
|
|
|
/**
|
|
* cogl_rectangles_with_texture_coords:
|
|
* @verts: (in) (array) (transfer none): an array of vertices
|
|
* @n_rects: number of rectangles to draw
|
|
*
|
|
* Draws a series of rectangles in the same way that
|
|
* cogl_rectangle_with_texture_coords() does. In some situations it can give a
|
|
* significant performance boost to use this function rather than
|
|
* calling cogl_rectangle_with_texture_coords() separately for each rectangle.
|
|
*
|
|
* @verts should point to an array of #float<!-- -->s with
|
|
* @n_rects * 8 elements. Each group of 8 values corresponds to the
|
|
* parameters x1, y1, x2, y2, tx1, ty1, tx2 and ty2 and have the same
|
|
* meaning as in cogl_rectangle_with_texture_coords().
|
|
*
|
|
* Since: 0.8.6
|
|
*/
|
|
void
|
|
cogl_rectangles_with_texture_coords (const float *verts,
|
|
unsigned int n_rects);
|
|
|
|
/**
|
|
* cogl_rectangles:
|
|
* @verts: (in) (array) (transfer none): an array of vertices
|
|
* @n_rects: number of rectangles to draw
|
|
*
|
|
* Draws a series of rectangles in the same way that
|
|
* cogl_rectangle() does. In some situations it can give a
|
|
* significant performance boost to use this function rather than
|
|
* calling cogl_rectangle() separately for each rectangle.
|
|
*
|
|
* @verts should point to an array of #float<!-- -->s with
|
|
* @n_rects * 4 elements. Each group of 4 values corresponds to the
|
|
* parameters x1, y1, x2, and y2, and have the same
|
|
* meaning as in cogl_rectangle().
|
|
*
|
|
* Since: 1.0
|
|
*/
|
|
void
|
|
cogl_rectangles (const float *verts,
|
|
unsigned int n_rects);
|
|
|
|
/**
|
|
* cogl_polygon:
|
|
* @vertices: An array of #CoglTextureVertex structs
|
|
* @n_vertices: The length of the vertices array
|
|
* @use_color: %TRUE if the color member of #CoglTextureVertex should be used
|
|
*
|
|
* Draws a convex polygon using the current source material to fill / texture
|
|
* with according to the texture coordinates passed.
|
|
*
|
|
* If @use_color is %TRUE then the color will be changed for each vertex using
|
|
* the value specified in the color member of #CoglTextureVertex. This can be
|
|
* used for example to make the texture fade out by setting the alpha value of
|
|
* the color.
|
|
*
|
|
* All of the texture coordinates must be in the range [0,1] and repeating the
|
|
* texture is not supported.
|
|
*
|
|
* Because of the way this function is implemented it will currently
|
|
* only work if either the texture is not sliced or the backend is not
|
|
* OpenGL ES and the minifying and magnifying functions are both set
|
|
* to COGL_MATERIAL_FILTER_NEAREST.
|
|
*
|
|
* Since: 1.0
|
|
*/
|
|
void
|
|
cogl_polygon (const CoglTextureVertex *vertices,
|
|
unsigned int n_vertices,
|
|
gboolean use_color);
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __COGL_TEXTURE_H__ */
|