* backface/frontface culling (and rendering of backfacing polygons)

* fix clipping/viewport transform precision errors
* triangle/quad strips

GPU3D.h

@@ -27,6 +27,8 @@ typedef struct
     s32 Position[4];
     u8 Color[3];
 
+    bool Clipped;
+
 } Vertex;
 
 typedef struct
@@ -34,6 +36,10 @@ typedef struct
     Vertex* Vertices[10];
     u32 NumVertices;
 
+    u32 Attr;
+
+    bool FacingView;
+
 } Polygon;
 
 extern s32 Viewport[4];