mutter/cogl/driver/gles/cogl-gles.c
Robert Bragg be15bf75e4 Add internal _cogl_get_proc_address
This adds an internal _cogl_get_proc_address that doesn't need a
CoglContext. This will enable us to check driver features earlier.
2011-06-01 20:44:41 +01:00

137 lines
4.5 KiB
C

/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2007,2008,2009 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/>.
*
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "cogl.h"
#include "cogl-internal.h"
#include "cogl-context-private.h"
#include "cogl-feature-private.h"
gboolean
_cogl_gl_check_version (GError **error)
{
/* The GLES backend doesn't have any particular version requirements */
return TRUE;
}
/* Define a set of arrays containing the functions required from GL
for each feature */
#define COGL_FEATURE_BEGIN(name, min_gl_major, min_gl_minor, \
namespaces, extension_names, \
feature_flags, feature_flags_private) \
static const CoglFeatureFunction cogl_feature_ ## name ## _funcs[] = {
#define COGL_FEATURE_FUNCTION(ret, name, args) \
{ G_STRINGIFY (name), G_STRUCT_OFFSET (CoglContext, drv.pf_ ## name) },
#define COGL_FEATURE_END() \
{ NULL, 0 }, \
};
#include "cogl-feature-functions-gles.h"
/* Define an array of features */
#undef COGL_FEATURE_BEGIN
#define COGL_FEATURE_BEGIN(name, min_gl_major, min_gl_minor, \
namespaces, extension_names, \
feature_flags, feature_flags_private) \
{ min_gl_major, min_gl_minor, namespaces, \
extension_names, feature_flags, feature_flags_private, 0, \
cogl_feature_ ## name ## _funcs },
#undef COGL_FEATURE_FUNCTION
#define COGL_FEATURE_FUNCTION(ret, name, args)
#undef COGL_FEATURE_END
#define COGL_FEATURE_END()
static const CoglFeatureData cogl_feature_data[] =
{
#include "cogl-feature-functions-gles.h"
};
/* Query the GL extensions and lookup the corresponding function
* pointers. Theoretically the list of extensions can change for
* different GL contexts so it is the winsys backend's responsiblity
* to know when to re-query the GL extensions. */
void
_cogl_gl_update_features (CoglContext *context)
{
CoglFeatureFlags flags = 0;
const char *gl_extensions;
#ifndef HAVE_COGL_GLES2
int max_clip_planes = 0;
#endif
int num_stencil_bits = 0;
int i;
COGL_NOTE (WINSYS,
"Checking features\n"
" GL_VENDOR: %s\n"
" GL_RENDERER: %s\n"
" GL_VERSION: %s\n"
" GL_EXTENSIONS: %s",
glGetString (GL_VENDOR),
glGetString (GL_RENDERER),
glGetString (GL_VERSION),
glGetString (GL_EXTENSIONS));
gl_extensions = (const char*) glGetString (GL_EXTENSIONS);
GE( glGetIntegerv (GL_STENCIL_BITS, &num_stencil_bits) );
/* We need at least three stencil bits to combine clips */
if (num_stencil_bits > 2)
flags |= COGL_FEATURE_STENCIL_BUFFER;
#ifndef HAVE_COGL_GLES2
GE( glGetIntegerv (GL_MAX_CLIP_PLANES, &max_clip_planes) );
if (max_clip_planes >= 4)
flags |= COGL_FEATURE_FOUR_CLIP_PLANES;
#endif
#ifdef HAVE_COGL_GLES2
flags |= COGL_FEATURE_SHADERS_GLSL | COGL_FEATURE_OFFSCREEN;
/* Note GLES 2 core doesn't support mipmaps for npot textures or
* repeat modes other than CLAMP_TO_EDGE. */
flags |= COGL_FEATURE_TEXTURE_NPOT_BASIC;
flags |= COGL_FEATURE_DEPTH_RANGE;
#endif
flags |= COGL_FEATURE_VBOS;
/* Both GLES 1.1 and GLES 2.0 support point sprites in core */
flags |= COGL_FEATURE_POINT_SPRITE;
for (i = 0; i < G_N_ELEMENTS (cogl_feature_data); i++)
if (_cogl_feature_check (_cogl_context_get_winsys (context),
"GL", cogl_feature_data + i,
0, 0,
gl_extensions,
context))
flags |= cogl_feature_data[i].feature_flags;
/* Cache features */
context->feature_flags |= flags;
}