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mutter/cogl/driver/gl/cogl-gl.c
Neil Roberts 74fd618df9 Add conf vars to trick Cogl to think extensions are disabled 
This adds two new configuration environment variables:

COGL_DISABLE_GL_EXTENSIONS and
COGL_OVERRIDE_GL_VERSION

The variables can also be set in the cogl.conf file using the same
names.

The first one is a list of GL extension names separated by commas.
When set Cogl will assume any extension listed here is not available
by removing it from the string returned from
glGetString(GL_EXTENSIONS). If the string is set in both the config
file and the environment variable then the union of the two lists will
be used.

The second overrides the value returned from glGetString(GL_VERSION).
If the string is set in both places the version from the environment
variable will take priority.

These are sometimes useful for debugging Cogl to test the various
combinations of extensions. It could also be useful to work around
driver bugs where an extension is badly supported and it would be
better not to use it.

The variables in cogl-config that just set a global char * variable
have been put together in an array instead of having a separate blob
of code for each one in order to make it simpler to add new variables.

Reviewed-by: Robert Bragg <robert@linux.intel.com>

(cherry picked from commit ec69c2dc576c78664e0b73879365cb7414ecf441)
2012-08-06 18:51:33 +01:00

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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-private.h"
#include "cogl-internal.h"
#include "cogl-context-private.h"
#include "cogl-feature-private.h"
#include "cogl-renderer-private.h"
static CoglBool
_cogl_driver_pixel_format_from_gl_internal (CoglContext *context,
GLenum gl_int_format,
CoglPixelFormat *out_format)
{
/* It doesn't really matter we convert to exact same
format (some have no cogl match anyway) since format
is re-matched against cogl when getting or setting
texture image data.
*/
switch (gl_int_format)
{
case GL_ALPHA: case GL_ALPHA4: case GL_ALPHA8:
case GL_ALPHA12: case GL_ALPHA16:
*out_format = COGL_PIXEL_FORMAT_A_8;
return TRUE;
case GL_LUMINANCE: case GL_LUMINANCE4: case GL_LUMINANCE8:
case GL_LUMINANCE12: case GL_LUMINANCE16:
*out_format = COGL_PIXEL_FORMAT_G_8;
return TRUE;
case GL_RGB: case GL_RGB4: case GL_RGB5: case GL_RGB8:
case GL_RGB10: case GL_RGB12: case GL_RGB16: case GL_R3_G3_B2:
*out_format = COGL_PIXEL_FORMAT_RGB_888;
return TRUE;
case GL_RGBA: case GL_RGBA2: case GL_RGBA4: case GL_RGB5_A1:
case GL_RGBA8: case GL_RGB10_A2: case GL_RGBA12: case GL_RGBA16:
*out_format = COGL_PIXEL_FORMAT_RGBA_8888;
return TRUE;
}
return FALSE;
}
static CoglPixelFormat
_cogl_driver_pixel_format_to_gl (CoglContext *context,
CoglPixelFormat format,
GLenum *out_glintformat,
GLenum *out_glformat,
GLenum *out_gltype)
{
CoglPixelFormat required_format;
GLenum glintformat;
GLenum glformat = 0;
GLenum gltype;
required_format = format;
/* Find GL equivalents */
switch (format)
{
case COGL_PIXEL_FORMAT_A_8:
glintformat = GL_ALPHA;
glformat = GL_ALPHA;
gltype = GL_UNSIGNED_BYTE;
break;
case COGL_PIXEL_FORMAT_G_8:
glintformat = GL_LUMINANCE;
glformat = GL_LUMINANCE;
gltype = GL_UNSIGNED_BYTE;
break;
case COGL_PIXEL_FORMAT_RGB_888:
glintformat = GL_RGB;
glformat = GL_RGB;
gltype = GL_UNSIGNED_BYTE;
break;
case COGL_PIXEL_FORMAT_BGR_888:
glintformat = GL_RGB;
glformat = GL_BGR;
gltype = GL_UNSIGNED_BYTE;
break;
case COGL_PIXEL_FORMAT_RGBA_8888:
case COGL_PIXEL_FORMAT_RGBA_8888_PRE:
glintformat = GL_RGBA;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_BYTE;
break;
case COGL_PIXEL_FORMAT_BGRA_8888:
case COGL_PIXEL_FORMAT_BGRA_8888_PRE:
glintformat = GL_RGBA;
glformat = GL_BGRA;
gltype = GL_UNSIGNED_BYTE;
break;
/* The following two types of channel ordering
* have no GL equivalent unless defined using
* system word byte ordering */
case COGL_PIXEL_FORMAT_ARGB_8888:
case COGL_PIXEL_FORMAT_ARGB_8888_PRE:
glintformat = GL_RGBA;
glformat = GL_BGRA;
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
gltype = GL_UNSIGNED_INT_8_8_8_8;
#else
gltype = GL_UNSIGNED_INT_8_8_8_8_REV;
#endif
break;
case COGL_PIXEL_FORMAT_ABGR_8888:
case COGL_PIXEL_FORMAT_ABGR_8888_PRE:
glintformat = GL_RGBA;
glformat = GL_RGBA;
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
gltype = GL_UNSIGNED_INT_8_8_8_8;
#else
gltype = GL_UNSIGNED_INT_8_8_8_8_REV;
#endif
break;
case COGL_PIXEL_FORMAT_RGBA_1010102:
case COGL_PIXEL_FORMAT_RGBA_1010102_PRE:
glintformat = GL_RGBA;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_INT_10_10_10_2;
break;
case COGL_PIXEL_FORMAT_BGRA_1010102:
case COGL_PIXEL_FORMAT_BGRA_1010102_PRE:
glintformat = GL_RGBA;
glformat = GL_BGRA;
gltype = GL_UNSIGNED_INT_10_10_10_2;
break;
case COGL_PIXEL_FORMAT_ABGR_2101010:
case COGL_PIXEL_FORMAT_ABGR_2101010_PRE:
glintformat = GL_RGBA;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_INT_2_10_10_10_REV;
break;
case COGL_PIXEL_FORMAT_ARGB_2101010:
case COGL_PIXEL_FORMAT_ARGB_2101010_PRE:
glintformat = GL_RGBA;
glformat = GL_BGRA;
gltype = GL_UNSIGNED_INT_2_10_10_10_REV;
break;
/* The following three types of channel ordering
* are always defined using system word byte
* ordering (even according to GLES spec) */
case COGL_PIXEL_FORMAT_RGB_565:
glintformat = GL_RGB;
glformat = GL_RGB;
gltype = GL_UNSIGNED_SHORT_5_6_5;
break;
case COGL_PIXEL_FORMAT_RGBA_4444:
case COGL_PIXEL_FORMAT_RGBA_4444_PRE:
glintformat = GL_RGBA;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_SHORT_4_4_4_4;
break;
case COGL_PIXEL_FORMAT_RGBA_5551:
case COGL_PIXEL_FORMAT_RGBA_5551_PRE:
glintformat = GL_RGBA;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_SHORT_5_5_5_1;
break;
case COGL_PIXEL_FORMAT_ANY:
case COGL_PIXEL_FORMAT_YUV:
g_assert_not_reached ();
break;
}
/* All of the pixel formats are handled above so if this hits then
we've been given an invalid pixel format */
g_assert (glformat != 0);
if (out_glintformat != NULL)
*out_glintformat = glintformat;
if (out_glformat != NULL)
*out_glformat = glformat;
if (out_gltype != NULL)
*out_gltype = gltype;
return required_format;
}
static CoglBool
_cogl_get_gl_version (CoglContext *ctx,
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 = _cogl_context_get_gl_version (ctx)) == 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 CoglBool
check_gl_version (CoglContext *ctx,
GError **error)
{
int major, minor;
const char *gl_extensions;
if (!_cogl_get_gl_version (ctx, &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 = _cogl_context_get_gl_extensions (ctx);
/* 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;
}
static CoglBool
_cogl_driver_update_features (CoglContext *ctx,
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;
/* 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 */
ctx->glGetString =
(void *) _cogl_renderer_get_proc_address (ctx->display->renderer,
"glGetString",
TRUE);
if (!check_gl_version (ctx, 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),
_cogl_context_get_gl_version (ctx),
_cogl_context_get_gl_extensions (ctx));
_cogl_get_gl_version (ctx, &gl_major, &gl_minor);
_cogl_gpu_info_init (ctx, &ctx->gpu);
flags = (COGL_FEATURE_TEXTURE_READ_PIXELS
| COGL_FEATURE_UNSIGNED_INT_INDICES
| COGL_FEATURE_DEPTH_RANGE);
COGL_FLAGS_SET (ctx->features,
COGL_FEATURE_ID_UNSIGNED_INT_INDICES, TRUE);
COGL_FLAGS_SET (ctx->features, COGL_FEATURE_ID_DEPTH_RANGE, TRUE);
if (COGL_CHECK_GL_VERSION (gl_major, gl_minor, 1, 4))
COGL_FLAGS_SET (ctx->features, COGL_FEATURE_ID_MIRRORED_REPEAT, TRUE);
gl_extensions = _cogl_context_get_gl_extensions (ctx);
_cogl_feature_check_ext_functions (ctx,
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;
COGL_FLAGS_SET (ctx->features, COGL_FEATURE_ID_TEXTURE_NPOT, TRUE);
COGL_FLAGS_SET (ctx->features,
COGL_FEATURE_ID_TEXTURE_NPOT_BASIC, TRUE);
COGL_FLAGS_SET (ctx->features,
COGL_FEATURE_ID_TEXTURE_NPOT_MIPMAP, TRUE);
COGL_FLAGS_SET (ctx->features,
COGL_FEATURE_ID_TEXTURE_NPOT_REPEAT, TRUE);
}
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)
private_flags |= COGL_PRIVATE_FEATURE_STENCIL_BUFFER;
GE( ctx, glGetIntegerv (GL_MAX_CLIP_PLANES, &max_clip_planes) );
if (max_clip_planes >= 4)
private_flags |= COGL_PRIVATE_FEATURE_FOUR_CLIP_PLANES;
if (ctx->glGenRenderbuffers)
{
flags |= COGL_FEATURE_OFFSCREEN;
COGL_FLAGS_SET (ctx->features, COGL_FEATURE_ID_OFFSCREEN, TRUE);
}
if (ctx->glBlitFramebuffer)
private_flags |= COGL_PRIVATE_FEATURE_OFFSCREEN_BLIT;
if (ctx->glRenderbufferStorageMultisampleIMG)
{
flags |= COGL_FEATURE_OFFSCREEN_MULTISAMPLE;
COGL_FLAGS_SET (ctx->features,
COGL_FEATURE_ID_OFFSCREEN_MULTISAMPLE, TRUE);
}
if (COGL_CHECK_GL_VERSION (gl_major, gl_minor, 2, 1) ||
_cogl_check_extension ("GL_EXT_pixel_buffer_object", gl_extensions))
private_flags |= COGL_PRIVATE_FEATURE_PBOS;
if (COGL_CHECK_GL_VERSION (gl_major, gl_minor, 2, 0) ||
_cogl_check_extension ("GL_ARB_point_sprite", gl_extensions))
{
flags |= COGL_FEATURE_POINT_SPRITE;
COGL_FLAGS_SET (ctx->features, COGL_FEATURE_ID_POINT_SPRITE, TRUE);
}
if (ctx->glGenPrograms)
{
flags |= COGL_FEATURE_SHADERS_ARBFP;
COGL_FLAGS_SET (ctx->features, COGL_FEATURE_ID_ARBFP, TRUE);
}
if (ctx->glCreateProgram)
{
flags |= COGL_FEATURE_SHADERS_GLSL;
COGL_FLAGS_SET (ctx->features, COGL_FEATURE_ID_GLSL, TRUE);
}
/* If all of the old GLSL extensions are available then we can fake
* the GL 2.0 GLSL support by diverting to the old function names */
else if (ctx->glCreateProgramObject && /* GL_ARB_shader_objects */
ctx->glVertexAttribPointer && /* GL_ARB_vertex_shader */
_cogl_check_extension ("GL_ARB_fragment_shader", gl_extensions))
{
ctx->glCreateShader = ctx->glCreateShaderObject;
ctx->glCreateProgram = ctx->glCreateProgramObject;
ctx->glDeleteShader = ctx->glDeleteObject;
ctx->glDeleteProgram = ctx->glDeleteObject;
ctx->glAttachShader = ctx->glAttachObject;
ctx->glUseProgram = ctx->glUseProgramObject;
ctx->glGetProgramInfoLog = ctx->glGetInfoLog;
ctx->glGetShaderInfoLog = ctx->glGetInfoLog;
ctx->glGetShaderiv = ctx->glGetObjectParameteriv;
ctx->glGetProgramiv = ctx->glGetObjectParameteriv;
ctx->glDetachShader = ctx->glDetachObject;
ctx->glGetAttachedShaders = ctx->glGetAttachedObjects;
/* FIXME: there doesn't seem to be an equivalent for glIsShader
* and glIsProgram. This doesn't matter for now because Cogl
* doesn't use these but if we add support for simulating a
* GLES2 context on top of regular GL then we'll need to do
* something here */
flags |= COGL_FEATURE_SHADERS_GLSL;
COGL_FLAGS_SET (ctx->features, COGL_FEATURE_ID_GLSL, TRUE);
}
if (ctx->glGenBuffers)
{
private_flags |= COGL_PRIVATE_FEATURE_VBOS;
flags |= (COGL_FEATURE_MAP_BUFFER_FOR_READ |
COGL_FEATURE_MAP_BUFFER_FOR_WRITE);
COGL_FLAGS_SET (ctx->features,
COGL_FEATURE_ID_MAP_BUFFER_FOR_READ, TRUE);
COGL_FLAGS_SET (ctx->features,
COGL_FEATURE_ID_MAP_BUFFER_FOR_WRITE, TRUE);
}
if (_cogl_check_extension ("GL_ARB_texture_rectangle", gl_extensions))
{
flags |= COGL_FEATURE_TEXTURE_RECTANGLE;
COGL_FLAGS_SET (ctx->features,
COGL_FEATURE_ID_TEXTURE_RECTANGLE, TRUE);
}
if (ctx->glTexImage3D)
{
flags |= COGL_FEATURE_TEXTURE_3D;
COGL_FLAGS_SET (ctx->features, COGL_FEATURE_ID_TEXTURE_3D, TRUE);
}
if (ctx->glEGLImageTargetTexture2D)
private_flags |= COGL_PRIVATE_FEATURE_TEXTURE_2D_FROM_EGL_IMAGE;
if (_cogl_check_extension ("GL_EXT_packed_depth_stencil", gl_extensions))
private_flags |= COGL_PRIVATE_FEATURE_EXT_PACKED_DEPTH_STENCIL;
if (ctx->glGenSamplers)
private_flags |= COGL_PRIVATE_FEATURE_SAMPLER_OBJECTS;
/* Cache features */
ctx->private_feature_flags |= private_flags;
ctx->feature_flags |= flags;
return TRUE;
}
const CoglDriverVtable
_cogl_driver_gl =
{
_cogl_driver_pixel_format_from_gl_internal,
_cogl_driver_pixel_format_to_gl,
_cogl_driver_update_features
};
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