//finds OGL extension functions
//returns number found
int opengl_get_extensions()
{
OGL_extension_string = (char*)glGetString(GL_EXTENSIONS);
int num_found=0;
ogl_extension *cur=NULL;
for (int i=0; i < GL_NUM_EXTENSIONS; i++)
{
cur=&GL_Extensions[i];
if (opengl_find_extension(cur->extension_name))
{
//some extensions do not have functions
if (cur->function_name==NULL)
{
mprintf(("found extension %s\n", cur->extension_name));
cur->enabled=1;
num_found++;
continue;
}
cur->func_pointer=(uint)wglGetProcAddress(cur->function_name);
if (cur->func_pointer)
{
cur->enabled=1;
mprintf(("found extension function: %s -- extension: %s\n", cur->function_name, cur->extension_name));
num_found++;
}
else
{
mprintf(("found extension, but not function: %s -- extension:%s\n", cur->function_name, cur->extension_name));
}
}
else
{
mprintf(("did not find extension: %s\n", cur->extension_name));
if (cur->required_to_run)
{
Error(__FILE__,__LINE__,"The required OpenGL extension %s is not supported by your graphics card, please use the Glide or Direct3D rendering engines.\n\n",cur->extension_name);
}
}
}
return num_found;
}
//finds OGL extension functions
//returns number found
int opengl_get_extensions()
{
int i, j, k, num_found = 0;
ogl_extension *ext = NULL;
ogl_function *func = NULL;
OGL_extension_string = (char*)glGetString(GL_EXTENSIONS);
for (i = 0; i < NUM_OGL_EXTENSIONS; i++) {
ext = &GL_Extensions[i];
k = 0;
while ( !ext->enabled && (k < ext->num_extensions) ) {
if ( opengl_find_extension(ext->extension_name[k]) ) {
// some extensions do not have functions
if (!ext->num_functions) {
mprintf((" Using extension \"%s\".\n", ext->extension_name[k]));
ext->enabled = 1;
num_found++;
goto Next;
}
// we do have functions so check any/all of them
for (j = 0; j < ext->num_functions; j++) {
func = get_ogl_function( ext->function_names[j] );
if (func == NULL)
break;
if ( !func->function_ptr )
func->function_ptr = (ptr_u)GET_PROC_ADDRESS(func->function_name);
if ( !func->function_ptr )
break;
}
if ( j != ext->num_functions ) {
mprintf((" Found extension \"%s\", but can't find the required function \"%s()\". Extension will be disabled!\n", ext->extension_name[k], ext->function_names[j]));
if (ext->required_to_run)
Error( LOCATION, "The required OpenGL extension '%s' is not fully supported by your current driver version or graphics card.\n", ext->extension_name[k] );
} else {
mprintf((" Using extension \"%s\".\n", ext->extension_name[k]));
ext->enabled = 1;
num_found++;
}
} else {
// only report if unable to find when we have checked all available extension name variants
if ( k+1 >= ext->num_extensions ) {
mprintf((" Unable to find extension \"%s\".\n", ext->extension_name[k]));
if (ext->required_to_run)
Error( LOCATION, "The required OpenGL extension '%s' is not supported by your current driver version or graphics card.\n", ext->extension_name[k] );
}
}
// now move the the next extension name
Next:
k++;
}
}
num_found += opengl_get_extensions_special();
mprintf(( "\n" ));
return num_found;
}
