Refactor point and line clip flag calculation.

Move clip flag calculation for the new polygon vertices of points and lines
from the renderer to the clipper.

Change-Id: I41ac3647d8e9376586a1011d1cf28d83e9c963a2
Reviewed-on: https://swiftshader-review.googlesource.com/5423
Tested-by: Nicolas Capens <capn@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>

src/Renderer/Clipper.hpp

diff --git a/src/Renderer/Clipper.hpp b/src/Renderer/Clipper.hpp
index ad1af93e..9c7d110 100644
--- a/src/Renderer/Clipper.hpp
+++ b/src/Renderer/Clipper.hpp
@@ -29,6 +29,7 @@
 	public:
 		enum ClipFlags
 		{
+			// Indicates the vertex is outside the respective frustum plane
 			CLIP_RIGHT  = 1 << 0,
 			CLIP_TOP    = 1 << 1,
 			CLIP_FAR    = 1 << 2,
@@ -36,30 +37,35 @@
 			CLIP_BOTTOM = 1 << 4,
 			CLIP_NEAR   = 1 << 5,
 
-			CLIP_FINITE = 1 << 7,
+			CLIP_FRUSTUM = 0x003F,
+
+			CLIP_FINITE = 1 << 7,   // All position coordinates are finite
 
 			// User-defined clipping planes
-			CLIP_PLANE0	= 1 << 8,
-			CLIP_PLANE1	= 1 << 9,
-			CLIP_PLANE2	= 1 << 10,
-			CLIP_PLANE3	= 1 << 11,
-			CLIP_PLANE4	= 1 << 12,
-			CLIP_PLANE5	= 1 << 13
+			CLIP_PLANE0 = 1 << 8,
+			CLIP_PLANE1 = 1 << 9,
+			CLIP_PLANE2 = 1 << 10,
+			CLIP_PLANE3 = 1 << 11,
+			CLIP_PLANE4 = 1 << 12,
+			CLIP_PLANE5 = 1 << 13,
+
+			CLIP_USER = 0x3F00
 		};
 
 		Clipper();
 
 		~Clipper();
 
+		unsigned int computeClipFlags(const float4 &v);
 		bool clip(Polygon &polygon, int clipFlagsOr, const DrawCall &draw);
 
 	private:
 		void clipNear(Polygon &polygon);
 		void clipFar(Polygon &polygon);
-		void clipLeft(Polygon &polygon, const DrawData &data);
-		void clipRight(Polygon &polygon, const DrawData &data);
-		void clipTop(Polygon &polygon, const DrawData &data);
-		void clipBottom(Polygon &polygon, const DrawData &data);
+		void clipLeft(Polygon &polygon);
+		void clipRight(Polygon &polygon);
+		void clipTop(Polygon &polygon);
+		void clipBottom(Polygon &polygon);
 		void clipPlane(Polygon &polygon, const Plane &plane);
 
 		void clipEdge(float4 &Vo, const float4 &Vi, const float4 &Vj, float di, float dj) const;