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glamor: Compute GLSL version from GL_SHADING_LANGUAGE_VERSION (v3)

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Use code from Piglit project to compute GLSL version for either GL or
GLES. The Piglit code was originally written by Chad Versace.

v2: bail if the parse fails (requested by Eric Anholt)
v3: Use version 1.20 for GLES until we fix our programs (Eric Anholt)

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Keith Packard 2014-10-20 21:31:56 -07:00
parent dcb3d74ba8
commit ff3195aadd
1 changed files with 39 additions and 9 deletions
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48
glamor/glamor.c
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@ -1,5 +1,5 @@
/*
* Copyright © 2008 Intel Corporation
* Copyright © 2008,2011 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
@ -23,7 +23,7 @@
* Authors:
* Eric Anholt <eric@anholt.net>
* Zhigang Gong <zhigang.gong@linux.intel.com>
*
* Chad Versace <chad.versace@linux.intel.com>
*/
/** @file glamor.c
@ -336,7 +336,11 @@ glamor_init(ScreenPtr screen, unsigned int flags)
{
glamor_screen_private *glamor_priv;
int gl_version;
int glsl_major, glsl_minor;
int max_viewport_size[2];
const char *shading_version_string;
int shading_version_offset;
PictureScreenPtr ps = GetPictureScreenIfSet(screen);
if (flags & ~GLAMOR_VALID_FLAGS) {
@ -380,14 +384,40 @@ glamor_init(ScreenPtr screen, unsigned int flags)
gl_version = epoxy_gl_version();
/* Would be nice to have a cleaner test for GLSL 1.30 support,
* but for now this should suffice
*/
if (glamor_priv->gl_flavor == GLAMOR_GL_DESKTOP && gl_version >= 30)
glamor_priv->glsl_version = 130;
else
glamor_priv->glsl_version = 120;
shading_version_string = (char *) glGetString(GL_SHADING_LANGUAGE_VERSION);
if (!shading_version_string) {
LogMessage(X_WARNING,
"glamor%d: Failed to get GLSL version\n",
screen->myNum);
goto fail;
}
shading_version_offset = 0;
if (strncmp("OpenGL ES GLSL ES ", shading_version_string, 18) == 0)
shading_version_offset = 18;
if (sscanf(shading_version_string + shading_version_offset,
"%i.%i",
&glsl_major,
&glsl_minor) != 2) {
LogMessage(X_WARNING,
"glamor%d: Failed to parse GLSL version string %s\n",
screen->myNum, shading_version_string);
goto fail;
}
glamor_priv->glsl_version = glsl_major * 100 + glsl_minor;
if (glamor_priv->gl_flavor == GLAMOR_GL_ES2) {
/* Force us back to the base version of our programs on an ES
* context, anyway. Basically glamor only uses desktop 1.20
* or 1.30 currently. 1.30's new features are also present in
* ES 3.0, but our glamor_program.c constructions use a lot of
* compatibility features (to reduce the diff between 1.20 and
* 1.30 programs).
*/
glamor_priv->glsl_version = 120;
}
/* We'd like to require GL_ARB_map_buffer_range or
* GL_OES_map_buffer_range, since it offers more information to