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OpenGL: GPU_legacy_support workaround for nVidia

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nVidia Linux driver reports GL_CONTEXT_PROFILE_MASK = 0, which is a bug.
In that case check for the ARB_compatibility extension.

Non-buggy drivers will continue to use
GL_CONTEXT_COMPATIBILITY_PROFILE_BIT.

Thx to Dr Hackerman for reporting.
This commit is contained in:
Mike Erwin 2016-01-04 01:03:47 -05:00
parent 193b38cc47
commit 2e8a840307
1 changed files with 28 additions and 12 deletions
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40
source/blender/gpu/intern/gpu_extensions.c
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@ -230,23 +230,39 @@ void gpu_extensions_exit(void)
bool GPU_legacy_support(void)
{
// return whether or not current GL context is compatible with legacy OpenGL
/* return whether or not current GL context is compatible with legacy OpenGL */
static bool checked = false;
static bool support = true;
if (GLEW_VERSION_3_2) {
static GLint profile = 0;
if (profile == 0) {
if (!checked) {
if (GLEW_VERSION_3_2) {
GLint profile;
glGetIntegerv(GL_CONTEXT_PROFILE_MASK, &profile);
if (G.debug & G_DEBUG_GPU) {
printf("GL_CONTEXT_PROFILE_MASK = %#x (%s profile)\n", profile,
profile & GL_CONTEXT_COMPATIBILITY_PROFILE_BIT ? "compatibility" :
profile & GL_CONTEXT_CORE_PROFILE_BIT ? "core" : "unknown");
}
if (profile == 0) {
/* workaround for nVidia's Linux driver */
support = GLEW_ARB_compatibility;
}
else {
support = profile & GL_CONTEXT_COMPATIBILITY_PROFILE_BIT;
}
}
else if (GLEW_VERSION_3_1) {
support = GLEW_ARB_compatibility;
}
return profile & GL_CONTEXT_COMPATIBILITY_PROFILE_BIT;
}
else if (GLEW_VERSION_3_1) {
return GLEW_ARB_compatibility;
}
else {
return true;
/* any OpenGL version <= 3.0 is legacy, so support remains true */
checked = true;
}
return support;
}
bool GPU_glsl_support(void)