Bug 769812 - ATI OpenGL driver renders point sprite upside-down - r=jgilbert

content/canvas/src/WebGLContextValidate.cpp

@@ -746,6 +746,15 @@ WebGLContext::InitAndValidateGL()
         }
     }
 
+#ifdef XP_MACOSX
+    if (gl->WorkAroundDriverBugs() &&
+        gl->Vendor() == gl::GLContext::VendorATI) {
+        // 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
+
     // Check the shader validator pref
     NS_ENSURE_TRUE(Preferences::GetRootBranch(), false);
 

gfx/gl/GLContext.cpp

@@ -265,6 +265,7 @@ GLContext::InitWithPrefix(const char *prefix, bool trygl)
                 { (PRFuncPtr*) &mSymbols.fReadBuffer, { "ReadBuffer", NULL } },
                 { (PRFuncPtr*) &mSymbols.fMapBuffer, { "MapBuffer", NULL } },
                 { (PRFuncPtr*) &mSymbols.fUnmapBuffer, { "UnmapBuffer", NULL } },
+                { (PRFuncPtr*) &mSymbols.fPointParameterf, { "PointParameterf", NULL } },
                 { NULL, { NULL } },
             };
 

gfx/gl/GLContext.h

@@ -2453,6 +2453,12 @@ public:
         AFTER_GL_CALL;
     }
 
+    void fPointParameterf(GLenum pname, GLfloat param) {
+        BEFORE_GL_CALL;
+        mSymbols.fPointParameterf(pname, param);
+        AFTER_GL_CALL;
+    }
+
     void fPolygonOffset(GLfloat factor, GLfloat bias) {
         BEFORE_GL_CALL;
         mSymbols.fPolygonOffset(factor, bias);

gfx/gl/GLContextSymbols.h

@@ -163,6 +163,8 @@ struct GLContextSymbols
     PFNGLLINKPROGRAMPROC fLinkProgram;
     typedef void (GLAPIENTRY * PFNGLPIXELSTOREIPROC) (GLenum pname, GLint param);
     PFNGLPIXELSTOREIPROC fPixelStorei;
+    typedef void (GLAPIENTRY * PFNGLPOINTPARAMETERFPROC) (GLenum pname, GLfloat param);
+    PFNGLPOINTPARAMETERFPROC fPointParameterf;
     typedef void (GLAPIENTRY * PFNGLPOLYGONOFFSETPROC) (GLfloat factor, GLfloat bias);
     PFNGLPOLYGONOFFSETPROC fPolygonOffset;
     typedef void (GLAPIENTRY * PFNGLREADBUFFERPROC) (GLenum);