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/*
* 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-private.h"
#include "cogl-internal.h"
#include "cogl-context-private.h"
#include "cogl-feature-private.h"
#include "cogl-renderer-private.h"
static gboolean
_cogl_get_gl_version (int *major_out, int *minor_out)
{
const char *version_string, *major_end, *minor_end;
int major = 0, minor = 0;
_COGL_GET_CONTEXT (ctx, FALSE);
/* Get the OpenGL version number */
if ((version_string = (const char *) ctx->glGetString (GL_VERSION)) == NULL)
return FALSE;
/* Extract the major number */
for (major_end = version_string; *major_end >= '0'
&& *major_end <= '9'; major_end++)
major = (major * 10) + *major_end - '0';
/* If there were no digits or the major number isn't followed by a
dot then it is invalid */
if (major_end == version_string || *major_end != '.')
return FALSE;
/* Extract the minor number */
for (minor_end = major_end + 1; *minor_end >= '0'
&& *minor_end <= '9'; minor_end++)
minor = (minor * 10) + *minor_end - '0';
/* If there were no digits or there is an unexpected character then
it is invalid */
if (minor_end == major_end + 1
|| (*minor_end && *minor_end != ' ' && *minor_end != '.'))
return FALSE;
*major_out = major;
*minor_out = minor;
return TRUE;
}
static gboolean
check_gl_version (CoglContext *ctx,
GError **error)
{
int major, minor;
const char *gl_extensions;
if (!_cogl_get_gl_version (&major, &minor))
{
g_set_error (error,
COGL_DRIVER_ERROR,
COGL_DRIVER_ERROR_UNKNOWN_VERSION,
"The OpenGL version could not be determined");
return FALSE;
}
/* GL 1.3 supports all of the required functionality in core */
if (COGL_CHECK_GL_VERSION (major, minor, 1, 3))
return TRUE;
gl_extensions = (const char*) ctx->glGetString (GL_EXTENSIONS);
/* OpenGL 1.2 is only supported if we have the multitexturing
extension */
if (!_cogl_check_extension ("GL_ARB_multitexture", gl_extensions))
{
g_set_error (error,
COGL_DRIVER_ERROR,
COGL_DRIVER_ERROR_INVALID_VERSION,
"The OpenGL driver is missing "
"the GL_ARB_multitexture extension");
return FALSE;
}
/* OpenGL 1.2 is required */
if (!COGL_CHECK_GL_VERSION (major, minor, 1, 2))
{
g_set_error (error,
COGL_DRIVER_ERROR,
COGL_DRIVER_ERROR_INVALID_VERSION,
"The OpenGL version of your driver (%i.%i) "
"is not compatible with Cogl",
major, minor);
return FALSE;
}
return TRUE;
}
gboolean
_cogl_gl_update_features (CoglContext *context,
GError **error)
{
CoglPrivateFeatureFlags private_flags = 0;
CoglFeatureFlags flags = 0;
const char *gl_extensions;
int max_clip_planes = 0;
int num_stencil_bits = 0;
int gl_major = 0, gl_minor = 0;
_COGL_GET_CONTEXT (ctx, FALSE);
/* We have to special case getting the pointer to the glGetString
function because we need to use it to determine what functions we
can expect */
context->glGetString =
(void *) _cogl_renderer_get_proc_address (context->display->renderer,
"glGetString");
if (!check_gl_version (context, error))
return FALSE;
COGL_NOTE (WINSYS,
"Checking features\n"
" GL_VENDOR: %s\n"
" GL_RENDERER: %s\n"
" GL_VERSION: %s\n"
" GL_EXTENSIONS: %s",
ctx->glGetString (GL_VENDOR),
ctx->glGetString (GL_RENDERER),
ctx->glGetString (GL_VERSION),
ctx->glGetString (GL_EXTENSIONS));
_cogl_get_gl_version (&gl_major, &gl_minor);
flags = (COGL_FEATURE_TEXTURE_READ_PIXELS
| COGL_FEATURE_UNSIGNED_INT_INDICES
| COGL_FEATURE_DEPTH_RANGE);
gl_extensions = (const char *)ctx->glGetString (GL_EXTENSIONS);
_cogl_feature_check_ext_functions (context,
gl_major,
gl_minor,
gl_extensions);
if (COGL_CHECK_GL_VERSION (gl_major, gl_minor, 2, 0) ||
_cogl_check_extension ("GL_ARB_texture_non_power_of_two", gl_extensions))
{
flags |= COGL_FEATURE_TEXTURE_NPOT
| COGL_FEATURE_TEXTURE_NPOT_BASIC
| COGL_FEATURE_TEXTURE_NPOT_MIPMAP
| COGL_FEATURE_TEXTURE_NPOT_REPEAT;
}
#ifdef GL_YCBCR_MESA
if (_cogl_check_extension ("GL_MESA_ycbcr_texture", gl_extensions))
{
flags |= COGL_FEATURE_TEXTURE_YUV;
}
#endif
if (_cogl_check_extension ("GL_MESA_pack_invert", gl_extensions))
private_flags |= COGL_PRIVATE_FEATURE_MESA_PACK_INVERT;
GE( ctx, 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;
GE( ctx, glGetIntegerv (GL_MAX_CLIP_PLANES, &max_clip_planes) );
if (max_clip_planes >= 4)
flags |= COGL_FEATURE_FOUR_CLIP_PLANES;
if (context->glGenRenderbuffers)
flags |= COGL_FEATURE_OFFSCREEN;
if (context->glBlitFramebuffer)
flags |= COGL_FEATURE_OFFSCREEN_BLIT;
if (context->glRenderbufferStorageMultisample)
flags |= COGL_FEATURE_OFFSCREEN_MULTISAMPLE;
if (COGL_CHECK_GL_VERSION (gl_major, gl_minor, 2, 1) ||
_cogl_check_extension ("GL_EXT_pixel_buffer_object", gl_extensions))
flags |= COGL_FEATURE_PBOS;
if (context->glGenPrograms)
flags |= COGL_FEATURE_SHADERS_ARBFP;
if (context->glCreateProgram)
flags |= COGL_FEATURE_SHADERS_GLSL;
if (context->glGenBuffers)
flags |= (COGL_FEATURE_VBOS |
COGL_FEATURE_MAP_BUFFER_FOR_READ |
COGL_FEATURE_MAP_BUFFER_FOR_WRITE);
if (_cogl_check_extension ("GL_ARB_texture_rectangle", gl_extensions))
flags |= COGL_FEATURE_TEXTURE_RECTANGLE;
if (context->glTexImage3D)
flags |= COGL_FEATURE_TEXTURE_3D;
if (context->glEGLImageTargetTexture2D)
private_flags |= COGL_PRIVATE_FEATURE_TEXTURE_2D_FROM_EGL_IMAGE;
/* Cache features */
context->private_feature_flags |= private_flags;
context->feature_flags |= flags;
return TRUE;
}
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