dae02a99a5
Instead of storing all of the feature function pointers in the driver specific data of the CoglContext they are now all stored directly in CoglContext. There is a single header containing the description of the functions which gets included by cogl-context.h. There is a single function in cogl-feature-private.c to check for all of these functions. The name of the function pointer variables have been changed from ctx->drv.pf_glWhatever to just ctx->glWhatever. The feature flags that get set when an extension is available are now separated from the table of extensions. This is necessary because different extensions can mean different things on GLES and GL. For example, having access to glMapBuffer implies read and write support on GL but only write support on GLES. The flags are instead set in the driver specific init function by checking whether the function pointers were successfully resolved. _cogl_feature_check has been changed to assume the feature is supported if any of the listed extensions are available instead of requiring all of them. This makes it more convenient to specify alternate names for the extension. Nothing else had previously listed more than one name for an extension so this shouldn't cause any problems.
135 lines
4.2 KiB
C
135 lines
4.2 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.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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gboolean
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_cogl_gl_check_version (GError **error)
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{
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/* The GLES backend doesn't have any particular version requirements */
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return TRUE;
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}
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/* Query the GL extensions and lookup the corresponding function
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* pointers. Theoretically the list of extensions can change for
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* different GL contexts so it is the winsys backend's responsiblity
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* to know when to re-query the GL extensions. */
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void
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_cogl_gl_update_features (CoglContext *context)
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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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#ifndef HAVE_COGL_GLES2
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int max_clip_planes = 0;
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#endif
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int num_stencil_bits = 0;
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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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glGetString (GL_VENDOR),
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glGetString (GL_RENDERER),
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glGetString (GL_VERSION),
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glGetString (GL_EXTENSIONS));
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gl_extensions = (const char*) glGetString (GL_EXTENSIONS);
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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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#ifdef HAVE_COGL_GLES2
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COGL_EXT_IN_GLES2
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#else
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COGL_EXT_IN_GLES
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#endif
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);
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GE( 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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flags |= COGL_FEATURE_STENCIL_BUFFER;
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#ifndef HAVE_COGL_GLES2
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GE( glGetIntegerv (GL_MAX_CLIP_PLANES, &max_clip_planes) );
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if (max_clip_planes >= 4)
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flags |= COGL_FEATURE_FOUR_CLIP_PLANES;
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#endif
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#ifdef HAVE_COGL_GLES2
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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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#endif
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flags |= COGL_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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if (context->glGenRenderbuffers)
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flags |= COGL_FEATURE_OFFSCREEN;
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if (context->glBlitFramebuffer)
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flags |= COGL_FEATURE_OFFSCREEN_BLIT;
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if (_cogl_check_extension ("GL_OES_element_index_uint", gl_extensions))
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flags |= COGL_FEATURE_UNSIGNED_INT_INDICES;
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if (_cogl_check_extension ("GL_OES_texture_npot", gl_extensions) ||
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_cogl_check_extension ("GL_IMG_texture_npot", gl_extensions))
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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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if (context->glTexImage3D)
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flags |= COGL_FEATURE_TEXTURE_3D;
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if (context->glMapBuffer)
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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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if (context->glEGLImageTargetTexture2D)
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flags |= COGL_PRIVATE_FEATURE_TEXTURE_2D_FROM_EGL_IMAGE;
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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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}
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