2b119b07da
cogl-ext-functions.h now contains definitions for all of the core GL and GLES functions that we would normally link to directly. All of the code has changed to access them through the cogl context pointer. The GE macro now takes an extra parameter to specify the context because the macro itself needs to make GL calls but various points in the Cogl source use different names for the context variable.
233 lines
7 KiB
C
233 lines
7 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-private.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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static gboolean
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_cogl_get_gl_version (int *major_out, int *minor_out)
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{
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const char *version_string, *major_end, *minor_end;
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int major = 0, minor = 0;
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_COGL_GET_CONTEXT (ctx, FALSE);
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/* Get the OpenGL version number */
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if ((version_string = (const char *) ctx->glGetString (GL_VERSION)) == NULL)
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return FALSE;
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/* Extract the major number */
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for (major_end = version_string; *major_end >= '0'
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&& *major_end <= '9'; major_end++)
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major = (major * 10) + *major_end - '0';
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/* If there were no digits or the major number isn't followed by a
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dot then it is invalid */
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if (major_end == version_string || *major_end != '.')
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return FALSE;
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/* Extract the minor number */
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for (minor_end = major_end + 1; *minor_end >= '0'
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&& *minor_end <= '9'; minor_end++)
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minor = (minor * 10) + *minor_end - '0';
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/* If there were no digits or there is an unexpected character then
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it is invalid */
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if (minor_end == major_end + 1
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|| (*minor_end && *minor_end != ' ' && *minor_end != '.'))
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return FALSE;
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*major_out = major;
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*minor_out = minor;
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return TRUE;
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}
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gboolean
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_cogl_gl_check_version (GError **error)
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{
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int major, minor;
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const char *gl_extensions;
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_COGL_GET_CONTEXT (ctx, FALSE);
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if (!_cogl_get_gl_version (&major, &minor))
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{
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g_set_error (error,
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COGL_DRIVER_ERROR,
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COGL_DRIVER_ERROR_UNKNOWN_VERSION,
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"The OpenGL version could not be determined");
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return FALSE;
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}
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/* GL 1.3 supports all of the required functionality in core */
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if (COGL_CHECK_GL_VERSION (major, minor, 1, 3))
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return TRUE;
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gl_extensions = (const char*) ctx->glGetString (GL_EXTENSIONS);
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/* OpenGL 1.2 is only supported if we have the multitexturing
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extension */
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if (!_cogl_check_extension ("GL_ARB_multitexture", gl_extensions))
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{
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g_set_error (error,
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COGL_DRIVER_ERROR,
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COGL_DRIVER_ERROR_INVALID_VERSION,
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"The OpenGL driver is missing "
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"the GL_ARB_multitexture extension");
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return FALSE;
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}
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/* OpenGL 1.2 is required */
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if (!COGL_CHECK_GL_VERSION (major, minor, 1, 2))
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{
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g_set_error (error,
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COGL_DRIVER_ERROR,
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COGL_DRIVER_ERROR_INVALID_VERSION,
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"The OpenGL version of your driver (%i.%i) "
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"is not compatible with Cogl",
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major, minor);
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return FALSE;
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}
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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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int max_clip_planes = 0;
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int num_stencil_bits = 0;
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int gl_major = 0, gl_minor = 0;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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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_get_proc_address (_cogl_context_get_winsys (context),
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"glGetString");
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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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ctx->glGetString (GL_VENDOR),
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ctx->glGetString (GL_RENDERER),
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ctx->glGetString (GL_VERSION),
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ctx->glGetString (GL_EXTENSIONS));
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_cogl_get_gl_version (&gl_major, &gl_minor);
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flags = (COGL_FEATURE_TEXTURE_READ_PIXELS
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| COGL_FEATURE_UNSIGNED_INT_INDICES
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| COGL_FEATURE_DEPTH_RANGE);
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gl_extensions = (const char *)ctx->glGetString (GL_EXTENSIONS);
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_cogl_feature_check_ext_functions (context,
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gl_major,
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gl_minor,
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gl_extensions,
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0 /* gles_version */);
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if (COGL_CHECK_GL_VERSION (gl_major, gl_minor, 2, 0) ||
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_cogl_check_extension ("GL_ARB_texture_non_power_of_two", 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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}
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#ifdef GL_YCBCR_MESA
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if (_cogl_check_extension ("GL_MESA_ycbcr_texture", gl_extensions))
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{
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flags |= COGL_FEATURE_TEXTURE_YUV;
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}
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#endif
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GE( ctx, 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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GE( ctx, 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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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 (context->glRenderbufferStorageMultisample)
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flags |= COGL_FEATURE_OFFSCREEN_MULTISAMPLE;
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if (COGL_CHECK_GL_VERSION (gl_major, gl_minor, 2, 1) ||
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_cogl_check_extension ("GL_EXT_pixel_buffer_object", gl_extensions))
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flags |= COGL_FEATURE_PBOS;
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if (context->glGenPrograms)
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flags |= COGL_FEATURE_SHADERS_ARBFP;
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if (context->glCreateProgram)
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flags |= COGL_FEATURE_SHADERS_GLSL;
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if (context->glGenBuffers)
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flags |= (COGL_FEATURE_VBOS |
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COGL_FEATURE_MAP_BUFFER_FOR_READ |
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COGL_FEATURE_MAP_BUFFER_FOR_WRITE);
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if (_cogl_check_extension ("GL_ARB_texture_rectangle", gl_extensions))
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flags |= COGL_FEATURE_TEXTURE_RECTANGLE;
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if (context->glTexImage3D)
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flags |= COGL_FEATURE_TEXTURE_3D;
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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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/* 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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