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OpenGL: new GPU_legacy_support() function 

Is current context compatible with legacy GL (version 2.1)?

My earlier approach -- checking for GLEW_ARB_compatibility -- was not
enough.

This should always return true if we set our GL context up properly. It
will return false when we switch to core profile.
This commit is contained in:
Mike Erwin 2015-12-06 18:00:22 -05:00
parent 1858823d3b
commit 8cfcc444c6
2 changed files with 25 additions and 3 deletions
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1
source/blender/gpu/GPU_extensions.h
View File

@ -59,6 +59,7 @@ typedef struct GPUProgram GPUProgram;
void GPU_extensions_disable(void);
bool GPU_legacy_support(void);
bool GPU_glsl_support(void);
bool GPU_non_power_of_two_support(void);
bool GPU_display_list_support(void);

27
source/blender/gpu/intern/gpu_extensions.c
View File

@ -265,6 +265,27 @@ void gpu_extensions_exit(void)
GPU_invalid_tex_free();
}
bool GPU_legacy_support(void)
{
// return whether or not current GL context is compatible with legacy OpenGL
if (GLEW_VERSION_3_2) {
static GLint profile = 0;
if (profile == 0) {
glGetIntegerv(GL_CONTEXT_PROFILE_MASK, &profile);
}
return profile & GL_CONTEXT_COMPATIBILITY_PROFILE_BIT;
}
else if (GLEW_VERSION_3_1) {
return GLEW_ARB_compatibility;
}
else {
return true;
}
}
bool GPU_glsl_support(void)
{
/* always supported, still queried by game engine */
@ -298,12 +319,12 @@ bool GPU_geometry_shader_support(void)
* core profile clashes with our other shaders so accept compatibility only
* other GL versions can use EXT_geometry_shader4 if available
*/
return (GLEW_VERSION_3_2 && GLEW_ARB_compatibility) || GLEW_EXT_geometry_shader4;
return (GLEW_VERSION_3_2 && GPU_legacy_support()) || GLEW_EXT_geometry_shader4;
}
static bool GPU_geometry_shader_support_via_extension(void)
{
return GLEW_EXT_geometry_shader4 && !(GLEW_VERSION_3_2 && GLEW_ARB_compatibility);
return GLEW_EXT_geometry_shader4 && !(GLEW_VERSION_3_2 && GPU_legacy_support());
}
bool GPU_instanced_drawing_support(void)
@ -1646,7 +1667,7 @@ static void shader_print_errors(const char *task, const char *log, const char **
static const char *gpu_shader_version(void)
{
if (GLEW_VERSION_3_2) {
if (GLEW_ARB_compatibility) {
if (GPU_legacy_support()) {
return "#version 150 compatibility\n";
/* highest version that is widely supported
* gives us native geometry shaders!