mirror of
https://github.com/brl/mutter.git
synced 2024-12-25 12:32:05 +00:00
7571cc1923
This adds three new feature flags COGL_FEATURE_TEXTURE_NPOT_BASIC, COGL_FEATURE_TEXTURE_NPOT_MIPMAP and COGL_FEATURE_TEXTURE_NPOT_REPEAT that can tell you if your hardware supports non power of two textures, npot textures + mipmaps and npot textures + wrap modes other than CLAMP_TO_EDGE. The pre-existing COGL_FEATURE_TEXTURE_NPOT feature implies all of the above. By default GLES 2 core supports npot textures but mipmaps and repeat modes can only be used with power of two textures. This patch also makes GLES check for the GL_OES_texture_npot extension to determine if mipmaps and repeating are supported with npot textures.
238 lines
7.3 KiB
C
238 lines
7.3 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.h"
|
|
#include "cogl-feature-private.h"
|
|
|
|
#ifdef HAVE_CLUTTER_OSX
|
|
static gboolean
|
|
really_enable_npot (void)
|
|
{
|
|
/* OSX backend + ATI Radeon X1600 + NPOT texture + GL_REPEAT seems to crash
|
|
* http://bugzilla.openedhand.com/show_bug.cgi?id=929
|
|
*
|
|
* Temporary workaround until post 0.8 we rejig the features set up a
|
|
* little to allow the backend to overide.
|
|
*/
|
|
const char *gl_renderer;
|
|
const char *env_string;
|
|
|
|
/* Regardless of hardware, allow user to decide. */
|
|
env_string = g_getenv ("COGL_ENABLE_NPOT");
|
|
if (env_string != NULL)
|
|
return env_string[0] == '1';
|
|
|
|
gl_renderer = (char*)glGetString (GL_RENDERER);
|
|
if (strstr (gl_renderer, "ATI Radeon X1600") != NULL)
|
|
return FALSE;
|
|
|
|
return TRUE;
|
|
}
|
|
#endif
|
|
|
|
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;
|
|
|
|
/* Get the OpenGL version number */
|
|
if ((version_string = (const char *) 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;
|
|
}
|
|
|
|
gboolean
|
|
_cogl_check_driver_valid (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*) 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;
|
|
}
|
|
|
|
/* 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.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, \
|
|
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.h"
|
|
};
|
|
|
|
void
|
|
_cogl_features_init (void)
|
|
{
|
|
CoglFeatureFlags flags = 0;
|
|
CoglFeatureFlagsPrivate flags_private = 0;
|
|
const char *gl_extensions;
|
|
GLint max_clip_planes = 0;
|
|
GLint num_stencil_bits = 0;
|
|
int gl_major = 0, gl_minor = 0;
|
|
int i;
|
|
|
|
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
|
|
|
|
_cogl_get_gl_version (&gl_major, &gl_minor);
|
|
|
|
flags = (COGL_FEATURE_TEXTURE_READ_PIXELS
|
|
| COGL_FEATURE_UNSIGNED_INT_INDICES);
|
|
|
|
gl_extensions = (const char*) glGetString (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))
|
|
{
|
|
#ifdef HAVE_CLUTTER_OSX
|
|
if (really_enable_npot ())
|
|
#endif
|
|
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
|
|
|
|
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;
|
|
|
|
GE( glGetIntegerv (GL_MAX_CLIP_PLANES, &max_clip_planes) );
|
|
if (max_clip_planes >= 4)
|
|
flags |= COGL_FEATURE_FOUR_CLIP_PLANES;
|
|
|
|
for (i = 0; i < G_N_ELEMENTS (cogl_feature_data); i++)
|
|
if (_cogl_feature_check ("GL", cogl_feature_data + i,
|
|
gl_major, gl_minor,
|
|
gl_extensions))
|
|
{
|
|
flags |= cogl_feature_data[i].feature_flags;
|
|
flags_private |= cogl_feature_data[i].feature_flags_private;
|
|
}
|
|
|
|
/* Cache features */
|
|
ctx->feature_flags = flags;
|
|
ctx->feature_flags_private = flags_private;
|
|
ctx->features_cached = TRUE;
|
|
}
|