1 files changed, 12 insertions, 0 deletions
diff --git a/dom/canvas/WebGLContextValidate.cpp b/dom/canvas/WebGLContextValidate.cpp
index 60bb3a32cc..30d4c65221 100644
--- a/dom/canvas/WebGLContextValidate.cpp
+++ b/dom/canvas/WebGLContextValidate.cpp
@@ -695,6 +695,18 @@ WebGLContext::InitAndValidateGL(FailureReason* const out_failReason)
         gl->fEnable(LOCAL_GL_PROGRAM_POINT_SIZE);
     }
 
+#ifdef XP_MACOSX
+    if (gl->WorkAroundDriverBugs() &&
+        gl->Vendor() == gl::GLVendor::ATI &&
+        !nsCocoaFeatures::IsAtLeastVersion(10,9))
+    {
+        // The Mac ATI driver, in all known OSX version up to and including
+        // 10.8, renders points sprites upside-down. (Apple bug 11778921)
+        gl->fPointParameterf(LOCAL_GL_POINT_SPRITE_COORD_ORIGIN,
+                             LOCAL_GL_LOWER_LEFT);
+    }
+#endif
+
     if (gl->IsSupported(gl::GLFeature::seamless_cube_map_opt_in)) {
         gl->fEnable(LOCAL_GL_TEXTURE_CUBE_MAP_SEAMLESS);
     }