// 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_PixelProgram_hpp
#define sw_PixelProgram_hpp

#include "PixelRoutine.hpp"
#include "SamplerCore.hpp"

namespace sw
{
	class PixelProgram : public PixelRoutine
	{
	public:
		PixelProgram(
				const PixelProcessor::State &state,
				vk::PipelineLayout const *pipelineLayout,
				SpirvShader const *spirvShader) :
			PixelRoutine(state, pipelineLayout, spirvShader)
		{
		}

		virtual ~PixelProgram() {}

	protected:
		virtual void setBuiltins(Int &x, Int &y, Float4(&z)[4], Float4 &w);
		virtual void applyShader(Int cMask[4]);
		virtual Bool alphaTest(Int cMask[4]);
		virtual void rasterOperation(Pointer<Byte> cBuffer[4], Int &x, Int sMask[4], Int zMask[4], Int cMask[4]);

	private:
		// Color outputs
		Vector4f c[RENDERTARGETS];

		// Per pixel based on conditions reached
		Int enableIndex;
		Array<Int4, 1 + 24> enableStack;

		// Raster operations
		void clampColor(Vector4f oC[RENDERTARGETS]);

		Int4 enableMask();

		Float4 linearToSRGB(const Float4 &x);
	};
}

#endif