[PATCH 3/5] opengl32: Fix extension checks on OpenGL core profile contexts.

[Matteo Bruni]

---
 dlls/opengl32/wgl.c | 42 ++++++++++++++++++++++++++++++++++++++----
 1 file changed, 38 insertions(+), 4 deletions(-)

diff --git a/dlls/opengl32/wgl.c b/dlls/opengl32/wgl.c
index 3a5e148..54f2aea 100644
--- a/dlls/opengl32/wgl.c
+++ b/dlls/opengl32/wgl.c
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "wine/port.h"
 
+#include <stdio.h>
 #include <stdarg.h>
 #include <stdlib.h>
 #include <string.h>
@@ -667,6 +668,23 @@ int WINAPI wglGetLayerPaletteEntries(HDC hdc,
 /* check if the extension is present in the list */
 static BOOL has_extension( const char *list, const char *ext, size_t len )
 {
+    if (!list)
+    {
+        const struct opengl_funcs *funcs = NtCurrentTeb()->glTable;
+        const char *gl_ext;
+        unsigned int i;
+        GLint extensions_count;
+
+        glGetIntegerv(GL_NUM_EXTENSIONS, &extensions_count);
+        for (i = 0; i < extensions_count; ++i)
+        {
+            gl_ext = (const char *)funcs->ext.p_glGetStringi(GL_EXTENSIONS, i);
+            if (!strncmp(gl_ext, ext, len) && !gl_ext[len])
+                return TRUE;
+        }
+        return FALSE;
+    }
+
     while (list)
     {
         while (*list == ' ') list++;
@@ -685,14 +703,30 @@ static int compar(const void *elt_a, const void *elt_b) {
 static BOOL is_extension_supported(const char* extension)
 {
     const struct opengl_funcs *funcs = NtCurrentTeb()->glTable;
-    const char *gl_ext_string = (const char*)glGetString(GL_EXTENSIONS);
+    const char *gl_ext_string = NULL, *gl_version;
     size_t len;
+    unsigned int major;
 
     TRACE("Checking for extension '%s'\n", extension);
 
-    if(!gl_ext_string) {
-        ERR("No OpenGL extensions found, check if your OpenGL setup is correct!\n");
-        return FALSE;
+    gl_version = (const char *)glGetString(GL_VERSION);
+    sscanf(gl_version, "%u", &major);
+    if (major >= 3)
+    {
+        if (!funcs->ext.p_glGetStringi)
+        {
+            void **func_ptr = (void **)&funcs->ext.p_glGetStringi;
+            *func_ptr = funcs->wgl.p_wglGetProcAddress("glGetStringi");
+        }
+    }
+    else
+    {
+        gl_ext_string = (const char*)glGetString(GL_EXTENSIONS);
+        if (!gl_ext_string)
+        {
+            ERR("No OpenGL extensions found, check if your OpenGL setup is correct!\n");
+            return FALSE;
+        }
     }
 
     /* We use the GetProcAddress function from the display driver to retrieve function pointers
-- 
2.0.5