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Use glGetStringi() for extension lookup on OpenGL contexts >= version 3.0.

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Fixes Bugzilla #1620.
This commit is contained in:
Ryan C. Gordon
2013-05-22 01:31:04 -04:00
parent 89efb1821f
commit a3be5baa21
1 changed files with 37 additions and 4 deletions
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41
src/video/SDL_video.c
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@@ -2347,6 +2347,12 @@ SDL_GL_UnloadLibrary(void)
}
}
static __inline__ SDL_bool
isAtLeastGL3(const char *verstr)
{
return ( verstr && (SDL_atoi(verstr) >= 3) );
}
SDL_bool
SDL_GL_ExtensionSupported(const char *extension)
{
@@ -2366,13 +2372,40 @@ SDL_GL_ExtensionSupported(const char *extension)
if (start && *start == '0') {
return SDL_FALSE;
}
/* Lookup the available extensions */
glGetStringFunc = SDL_GL_GetProcAddress("glGetString");
if (glGetStringFunc) {
extensions = (const char *) glGetStringFunc(GL_EXTENSIONS);
} else {
extensions = NULL;
if (!glGetStringFunc) {
return SDL_FALSE;
}
if (isAtLeastGL3((const char *) glGetStringFunc(GL_VERSION))) {
const GLubyte *(APIENTRY * glGetStringiFunc) (GLenum, GLuint);
void (APIENTRY * glGetIntegervFunc) (GLenum pname, GLint * params);
GLint num_exts = 0;
GLint i;
glGetStringiFunc = SDL_GL_GetProcAddress("glGetStringi");
glGetIntegervFunc = SDL_GL_GetProcAddress("glGetIntegerv");
if ((!glGetStringiFunc) || (!glGetIntegervFunc)) {
return SDL_FALSE;
}
glGetIntegervFunc(GL_NUM_EXTENSIONS, &num_exts);
for (i = 0; i < num_exts; i++) {
const char *thisext = (const char *) glGetStringiFunc(GL_EXTENSIONS, i);
if (SDL_strcmp(thisext, extension) == 0) {
return SDL_TRUE;
}
}
return SDL_FALSE;
}
/* Try the old way with glGetString(GL_EXTENSIONS) ... */
extensions = (const char *) glGetStringFunc(GL_EXTENSIONS);
if (!extensions) {
return SDL_FALSE;
}