21e304b339
This extension allows an application to upload data in BGRA format. We can use this to avoid a conversion in Cogl whenever it is given BGRA data. This is quite useful when uploading data generated by Cairo because at least on little-endian architectures that ends up as BGRA. The patch just makes the pixel_format_to_gl implementation return GL_BGRA_EXT for the data format and internal format whenever COGL_PIXEL_FORMAT_BGRA_8888{,_PRE} is used. A small caveat with this patch is that once a texture is created as GL_BGRA, when later using glTexSubImage2D to update the texture it must always be given data as GL_BGRA. Currently this just works out because we store the internal format of a texture as a CoglPixelFormat and we already swizzle the data if it does not match exactly on GLES. However if we later switch to using a different enum for internal formats then we might lose the ability to store the component ordering so we'll have to think of another way to do this.
122 lines
3.9 KiB
C
122 lines
3.9 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, see <http://www.gnu.org/licenses/>.
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*
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*
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*/
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#ifndef __COGL_INTERNAL_H
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#define __COGL_INTERNAL_H
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#include "cogl-bitmask.h"
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#ifdef COGL_HAS_XLIB_SUPPORT
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#include <X11/Xutil.h>
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#endif
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#ifdef COGL_GL_DEBUG
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const char *
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_cogl_gl_error_to_string (GLenum error_code);
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#define GE(ctx, x) G_STMT_START { \
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GLenum __err; \
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(ctx)->x; \
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while ((__err = (ctx)->glGetError ()) != GL_NO_ERROR) \
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{ \
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g_warning ("%s: GL error (%d): %s\n", \
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G_STRLOC, \
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__err, \
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_cogl_gl_error_to_string (__err)); \
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} } G_STMT_END
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#define GE_RET(ret, ctx, x) G_STMT_START { \
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GLenum __err; \
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ret = (ctx)->x; \
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while ((__err = (ctx)->glGetError ()) != GL_NO_ERROR) \
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{ \
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g_warning ("%s: GL error (%d): %s\n", \
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G_STRLOC, \
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__err, \
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_cogl_gl_error_to_string (__err)); \
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} } G_STMT_END
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#else /* !COGL_GL_DEBUG */
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#define GE(ctx, x) ((ctx)->x)
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#define GE_RET(ret, ctx, x) (ret = ((ctx)->x))
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#endif /* COGL_GL_DEBUG */
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#define COGL_ENABLE_ALPHA_TEST (1<<1)
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#define COGL_ENABLE_VERTEX_ARRAY (1<<2)
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#define COGL_ENABLE_COLOR_ARRAY (1<<3)
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void
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_cogl_enable (unsigned long flags);
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unsigned long
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_cogl_get_enable (void);
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void
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_cogl_transform_point (const CoglMatrix *matrix_mv,
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const CoglMatrix *matrix_p,
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const float *viewport,
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float *x,
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float *y);
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#define COGL_DRIVER_ERROR (_cogl_driver_error_quark ())
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typedef enum { /*< prefix=COGL_DRIVER_ERROR >*/
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COGL_DRIVER_ERROR_UNKNOWN_VERSION,
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COGL_DRIVER_ERROR_INVALID_VERSION,
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COGL_DRIVER_ERROR_NO_SUITABLE_DRIVER_FOUND,
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COGL_DRIVER_ERROR_FAILED_TO_LOAD_LIBRARY
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} CoglDriverError;
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typedef enum
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{
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COGL_PRIVATE_FEATURE_TEXTURE_2D_FROM_EGL_IMAGE = 1L<<0,
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COGL_PRIVATE_FEATURE_MESA_PACK_INVERT = 1L<<1,
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COGL_PRIVATE_FEATURE_STENCIL_BUFFER = 1L<<2,
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COGL_PRIVATE_FEATURE_OFFSCREEN_BLIT = 1L<<3,
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COGL_PRIVATE_FEATURE_FOUR_CLIP_PLANES = 1L<<4,
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COGL_PRIVATE_FEATURE_PBOS = 1L<<5,
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COGL_PRIVATE_FEATURE_VBOS = 1L<<6,
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COGL_PRIVATE_FEATURE_EXT_PACKED_DEPTH_STENCIL = 1L<<7,
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COGL_PRIVATE_FEATURE_OES_PACKED_DEPTH_STENCIL = 1L<<8,
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COGL_PRIVATE_FEATURE_TEXTURE_FORMAT_BGRA8888 = 1L<<9
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} CoglPrivateFeatureFlags;
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/* Sometimes when evaluating pipelines, either during comparisons or
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* if calculating a hash value we need to tweak the evaluation
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* semantics */
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typedef enum _CoglPipelineEvalFlags
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{
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COGL_PIPELINE_EVAL_FLAG_NONE = 0
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} CoglPipelineEvalFlags;
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gboolean
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_cogl_check_extension (const char *name, const char *ext);
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GQuark
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_cogl_driver_error_quark (void);
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#endif /* __COGL_INTERNAL_H */
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