74fd618df9
This adds two new configuration environment variables: COGL_DISABLE_GL_EXTENSIONS and COGL_OVERRIDE_GL_VERSION The variables can also be set in the cogl.conf file using the same names. The first one is a list of GL extension names separated by commas. When set Cogl will assume any extension listed here is not available by removing it from the string returned from glGetString(GL_EXTENSIONS). If the string is set in both the config file and the environment variable then the union of the two lists will be used. The second overrides the value returned from glGetString(GL_VERSION). If the string is set in both places the version from the environment variable will take priority. These are sometimes useful for debugging Cogl to test the various combinations of extensions. It could also be useful to work around driver bugs where an extension is badly supported and it would be better not to use it. The variables in cogl-config that just set a global char * variable have been put together in an array instead of having a separate blob of code for each one in order to make it simpler to add new variables. Reviewed-by: Robert Bragg <robert@linux.intel.com> (cherry picked from commit ec69c2dc576c78664e0b73879365cb7414ecf441)
316 lines
10 KiB
C
316 lines
10 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 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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include "cogl-internal.h"
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#include "cogl-context-private.h"
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#include "cogl-feature-private.h"
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#include "cogl-renderer-private.h"
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#include "cogl-private.h"
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static CoglBool
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_cogl_driver_pixel_format_from_gl_internal (CoglContext *context,
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GLenum gl_int_format,
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CoglPixelFormat *out_format)
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{
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return TRUE;
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}
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static CoglPixelFormat
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_cogl_driver_pixel_format_to_gl (CoglContext *context,
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CoglPixelFormat format,
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GLenum *out_glintformat,
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GLenum *out_glformat,
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GLenum *out_gltype)
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{
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CoglPixelFormat required_format;
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GLenum glintformat;
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GLenum glformat = 0;
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GLenum gltype;
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required_format = format;
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/* Find GL equivalents */
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switch (format)
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{
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case COGL_PIXEL_FORMAT_A_8:
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glintformat = GL_ALPHA;
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glformat = GL_ALPHA;
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gltype = GL_UNSIGNED_BYTE;
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break;
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case COGL_PIXEL_FORMAT_G_8:
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glintformat = GL_LUMINANCE;
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glformat = GL_LUMINANCE;
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gltype = GL_UNSIGNED_BYTE;
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break;
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case COGL_PIXEL_FORMAT_BGRA_8888:
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case COGL_PIXEL_FORMAT_BGRA_8888_PRE:
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/* There is an extension to support this format */
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if ((context->private_feature_flags &
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COGL_PRIVATE_FEATURE_TEXTURE_FORMAT_BGRA8888))
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{
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/* For some reason the extension says you have to specify
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BGRA for the internal format too */
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glintformat = GL_BGRA_EXT;
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glformat = GL_BGRA_EXT;
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gltype = GL_UNSIGNED_BYTE;
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required_format = format;
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break;
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}
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/* flow through */
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/* Just one 24-bit ordering supported */
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case COGL_PIXEL_FORMAT_RGB_888:
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case COGL_PIXEL_FORMAT_BGR_888:
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glintformat = GL_RGB;
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glformat = GL_RGB;
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gltype = GL_UNSIGNED_BYTE;
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required_format = COGL_PIXEL_FORMAT_RGB_888;
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break;
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/* Just one 32-bit ordering supported */
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case COGL_PIXEL_FORMAT_RGBA_8888:
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case COGL_PIXEL_FORMAT_RGBA_8888_PRE:
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case COGL_PIXEL_FORMAT_ARGB_8888:
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case COGL_PIXEL_FORMAT_ARGB_8888_PRE:
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case COGL_PIXEL_FORMAT_ABGR_8888:
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case COGL_PIXEL_FORMAT_ABGR_8888_PRE:
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case COGL_PIXEL_FORMAT_RGBA_1010102:
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case COGL_PIXEL_FORMAT_RGBA_1010102_PRE:
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case COGL_PIXEL_FORMAT_BGRA_1010102:
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case COGL_PIXEL_FORMAT_BGRA_1010102_PRE:
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case COGL_PIXEL_FORMAT_ABGR_2101010:
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case COGL_PIXEL_FORMAT_ABGR_2101010_PRE:
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case COGL_PIXEL_FORMAT_ARGB_2101010:
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case COGL_PIXEL_FORMAT_ARGB_2101010_PRE:
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glintformat = GL_RGBA;
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glformat = GL_RGBA;
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gltype = GL_UNSIGNED_BYTE;
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required_format = COGL_PIXEL_FORMAT_RGBA_8888;
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required_format |= (format & COGL_PREMULT_BIT);
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break;
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/* The following three types of channel ordering
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* are always defined using system word byte
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* ordering (even according to GLES spec) */
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case COGL_PIXEL_FORMAT_RGB_565:
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glintformat = GL_RGB;
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glformat = GL_RGB;
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gltype = GL_UNSIGNED_SHORT_5_6_5;
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break;
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case COGL_PIXEL_FORMAT_RGBA_4444:
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case COGL_PIXEL_FORMAT_RGBA_4444_PRE:
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glintformat = GL_RGBA;
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glformat = GL_RGBA;
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gltype = GL_UNSIGNED_SHORT_4_4_4_4;
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break;
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case COGL_PIXEL_FORMAT_RGBA_5551:
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case COGL_PIXEL_FORMAT_RGBA_5551_PRE:
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glintformat = GL_RGBA;
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glformat = GL_RGBA;
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gltype = GL_UNSIGNED_SHORT_5_5_5_1;
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break;
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case COGL_PIXEL_FORMAT_ANY:
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case COGL_PIXEL_FORMAT_YUV:
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g_assert_not_reached ();
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break;
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}
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/* All of the pixel formats are handled above so if this hits then
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we've been given an invalid pixel format */
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g_assert (glformat != 0);
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if (out_glintformat != NULL)
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*out_glintformat = glintformat;
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if (out_glformat != NULL)
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*out_glformat = glformat;
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if (out_gltype != NULL)
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*out_gltype = gltype;
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return required_format;
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}
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static CoglBool
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_cogl_driver_update_features (CoglContext *context,
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GError **error)
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{
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CoglPrivateFeatureFlags private_flags = 0;
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CoglFeatureFlags flags = 0;
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const char *gl_extensions;
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int num_stencil_bits = 0;
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/* We have to special case getting the pointer to the glGetString
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function because we need to use it to determine what functions we
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can expect */
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context->glGetString =
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(void *) _cogl_renderer_get_proc_address (context->display->renderer,
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"glGetString",
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TRUE);
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COGL_NOTE (WINSYS,
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"Checking features\n"
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" GL_VENDOR: %s\n"
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" GL_RENDERER: %s\n"
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" GL_VERSION: %s\n"
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" GL_EXTENSIONS: %s",
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context->glGetString (GL_VENDOR),
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context->glGetString (GL_RENDERER),
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_cogl_context_get_gl_version (context),
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_cogl_context_get_gl_extensions (context));
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_cogl_gpu_info_init (context, &context->gpu);
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gl_extensions = _cogl_context_get_gl_extensions (context);
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_cogl_feature_check_ext_functions (context,
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-1 /* GL major version */,
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-1 /* GL minor version */,
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gl_extensions);
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GE( context, glGetIntegerv (GL_STENCIL_BITS, &num_stencil_bits) );
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/* We need at least three stencil bits to combine clips */
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if (num_stencil_bits > 2)
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private_flags |= COGL_PRIVATE_FEATURE_STENCIL_BUFFER;
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#ifdef HAVE_COGL_GLES
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if (context->driver == COGL_DRIVER_GLES1)
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{
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int max_clip_planes;
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GE( context, glGetIntegerv (GL_MAX_CLIP_PLANES, &max_clip_planes) );
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if (max_clip_planes >= 4)
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private_flags |= COGL_PRIVATE_FEATURE_FOUR_CLIP_PLANES;
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}
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#endif
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if (context->driver == COGL_DRIVER_GLES2)
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{
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flags |= COGL_FEATURE_SHADERS_GLSL | COGL_FEATURE_OFFSCREEN;
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/* Note GLES 2 core doesn't support mipmaps for npot textures or
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* repeat modes other than CLAMP_TO_EDGE. */
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flags |= COGL_FEATURE_TEXTURE_NPOT_BASIC;
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flags |= COGL_FEATURE_DEPTH_RANGE;
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COGL_FLAGS_SET (context->features, COGL_FEATURE_ID_GLSL, TRUE);
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COGL_FLAGS_SET (context->features, COGL_FEATURE_ID_OFFSCREEN, TRUE);
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COGL_FLAGS_SET (context->features,
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COGL_FEATURE_ID_TEXTURE_NPOT_BASIC, TRUE);
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COGL_FLAGS_SET (context->features, COGL_FEATURE_ID_DEPTH_RANGE, TRUE);
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COGL_FLAGS_SET (context->features,
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COGL_FEATURE_ID_MIRRORED_REPEAT, TRUE);
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}
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private_flags |= COGL_PRIVATE_FEATURE_VBOS;
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/* Both GLES 1.1 and GLES 2.0 support point sprites in core */
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flags |= COGL_FEATURE_POINT_SPRITE;
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COGL_FLAGS_SET (context->features, COGL_FEATURE_ID_POINT_SPRITE, TRUE);
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if (context->glGenRenderbuffers)
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{
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flags |= COGL_FEATURE_OFFSCREEN;
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COGL_FLAGS_SET (context->features, COGL_FEATURE_ID_OFFSCREEN, TRUE);
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}
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if (context->glBlitFramebuffer)
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private_flags |= COGL_PRIVATE_FEATURE_OFFSCREEN_BLIT;
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if (_cogl_check_extension ("GL_OES_element_index_uint", gl_extensions))
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{
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flags |= COGL_FEATURE_UNSIGNED_INT_INDICES;
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COGL_FLAGS_SET (context->features,
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COGL_FEATURE_ID_UNSIGNED_INT_INDICES, TRUE);
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}
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if (_cogl_check_extension ("GL_OES_texture_npot", gl_extensions))
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{
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flags |= (COGL_FEATURE_TEXTURE_NPOT |
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COGL_FEATURE_TEXTURE_NPOT_BASIC |
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COGL_FEATURE_TEXTURE_NPOT_MIPMAP |
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COGL_FEATURE_TEXTURE_NPOT_REPEAT);
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COGL_FLAGS_SET (context->features,
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COGL_FEATURE_ID_TEXTURE_NPOT, TRUE);
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COGL_FLAGS_SET (context->features,
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COGL_FEATURE_ID_TEXTURE_NPOT_BASIC, TRUE);
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COGL_FLAGS_SET (context->features,
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COGL_FEATURE_ID_TEXTURE_NPOT_MIPMAP, TRUE);
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COGL_FLAGS_SET (context->features,
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COGL_FEATURE_ID_TEXTURE_NPOT_REPEAT, TRUE);
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}
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else if (_cogl_check_extension ("GL_IMG_texture_npot", gl_extensions))
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{
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flags |= (COGL_FEATURE_TEXTURE_NPOT_BASIC |
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COGL_FEATURE_TEXTURE_NPOT_MIPMAP);
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COGL_FLAGS_SET (context->features,
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COGL_FEATURE_ID_TEXTURE_NPOT_BASIC, TRUE);
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COGL_FLAGS_SET (context->features,
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COGL_FEATURE_ID_TEXTURE_NPOT_MIPMAP, TRUE);
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}
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if (context->glTexImage3D)
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{
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flags |= COGL_FEATURE_TEXTURE_3D;
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COGL_FLAGS_SET (context->features, COGL_FEATURE_ID_TEXTURE_3D, TRUE);
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}
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if (context->glMapBuffer)
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{
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/* The GL_OES_mapbuffer extension doesn't support mapping for
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read */
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flags |= COGL_FEATURE_MAP_BUFFER_FOR_WRITE;
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COGL_FLAGS_SET (context->features,
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COGL_FEATURE_ID_MAP_BUFFER_FOR_WRITE, TRUE);
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}
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if (context->glEGLImageTargetTexture2D)
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private_flags |= COGL_PRIVATE_FEATURE_TEXTURE_2D_FROM_EGL_IMAGE;
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if (_cogl_check_extension ("GL_OES_packed_depth_stencil", gl_extensions))
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private_flags |= COGL_PRIVATE_FEATURE_OES_PACKED_DEPTH_STENCIL;
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if (_cogl_check_extension ("GL_EXT_texture_format_BGRA8888", gl_extensions))
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private_flags |= COGL_PRIVATE_FEATURE_TEXTURE_FORMAT_BGRA8888;
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if (_cogl_check_extension ("GL_EXT_unpack_subimage", gl_extensions))
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private_flags |= COGL_PRIVATE_FEATURE_UNPACK_SUBIMAGE;
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/* Cache features */
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context->private_feature_flags |= private_flags;
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context->feature_flags |= flags;
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return TRUE;
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}
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const CoglDriverVtable
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_cogl_driver_gles =
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{
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_cogl_driver_pixel_format_from_gl_internal,
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_cogl_driver_pixel_format_to_gl,
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_cogl_driver_update_features
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};
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