text: // Copyright 2016 The SwiftShader Authors. All Rights Reserved.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //    http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  #ifndef sw_QuadRasterizer_hpp
  #define sw_QuadRasterizer_hpp
  
  #include "Rasterizer.hpp"
  #include "Pipeline/ShaderCore.hpp"
  #include "Pipeline/SpirvShader.hpp"
  #include "System/Types.hpp"
  
  namespace sw
  {
  	class QuadRasterizer : public Rasterizer
  	{
  	public:
  		QuadRasterizer(const PixelProcessor::State &state, SpirvShader const *spirvShader);
  		virtual ~QuadRasterizer();
  
  		void generate();
  
  	protected:
  		Pointer<Byte> constants;
  
  		Float4 Dz[4];
  		Float4 Dw;
  		Float4 Dv[MAX_INTERFACE_COMPONENTS];
  		Float4 Df;
  
  		UInt occlusion;
  
  		virtual void quad(Pointer<Byte> cBuffer[4], Pointer<Byte> &zBuffer, Pointer<Byte> &sBuffer, Int cMask[4], Int &x, Int &y) = 0;
  
  		bool interpolateZ() const;
  		bool interpolateW() const;
  		Float4 interpolate(Float4 &x, Float4 &D, Float4 &rhw, Pointer<Byte> planeEquation, bool flat, bool perspective, bool clamp);
  
  		const PixelProcessor::State &state;
  		const SpirvShader *const spirvShader;
  
  	private:
  		void rasterize(Int &yMin, Int &yMax);
  	};
  }
  
  #endif   // sw_QuadRasterizer_hpp
  