src/Shader/VertexRoutine.hpp

// SwiftShader Software Renderer
//
// Copyright(c) 2005-2012 TransGaming Inc.
//
// All rights reserved. No part of this software may be copied, distributed, transmitted,
// transcribed, stored in a retrieval system, translated into any human or computer
// language by any means, or disclosed to third parties without the explicit written
// agreement of TransGaming Inc. Without such an agreement, no rights or licenses, express
// or implied, including but not limited to any patent rights, are granted to you.
//

#ifndef sw_VertexRoutine_hpp
#define sw_VertexRoutine_hpp

#include "Renderer/Color.hpp"
#include "Renderer/VertexProcessor.hpp"
#include "ShaderCore.hpp"
#include "VertexShader.hpp"

namespace sw
{
	class VertexRoutine
	{
	protected:
		struct Registers
		{
			Registers(const VertexShader *shader) :
				r(shader && shader->dynamicallyIndexedTemporaries),
				v(shader && shader->dynamicallyIndexedInput),
				o(shader && shader->dynamicallyIndexedOutput)
			{
				loopDepth = -1;
				enableStack[0] = Int4(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF);
				
				if(shader && shader->containsBreakInstruction())
				{
					enableBreak = Int4(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF);
				}

				if(shader && shader->containsContinueInstruction())
				{
					enableContinue = Int4(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF);
				}

				if(shader && shader->containsLeaveInstruction())
				{
					enableLeave = Int4(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF);
				}
			}

			Pointer<Byte> data;
			Pointer<Byte> constants;

			Int clipFlags;

			RegisterArray<16> v;
			RegisterArray<4096> r;
			RegisterArray<12> o;
			Vector4f a0;
			Array<Int, 4> aL;
			Vector4f p0;

			Array<Int, 4> increment;
			Array<Int, 4> iteration;

			Int loopDepth;
			Int stackIndex;   // FIXME: Inc/decrement callStack
			Array<UInt, 4> callStack;

			Int enableIndex;
			Array<Int4, 1 + 24> enableStack;
			Int4 enableBreak;
			Int4 enableContinue;
			Int4 enableLeave;
		};

	public:
		VertexRoutine(const VertexProcessor::State &state, const VertexShader *shader);

		virtual ~VertexRoutine();

		void generate();
		Routine *getRoutine();

	protected:
		const VertexProcessor::State &state;
		const VertexShader *const shader;

	private:		
		virtual void pipeline(Registers &r) = 0;

		typedef VertexProcessor::State::Input Stream;
		
		Vector4f readStream(Registers &r, Pointer<Byte> &buffer, UInt &stride, const Stream &stream, const UInt &index);
		void readInput(Registers &r, UInt &index);
		void computeClipFlags(Registers &r);
		void postTransform(Registers &r);
		void writeCache(Pointer<Byte> &cacheLine, Registers &r);
		void writeVertex(Pointer<Byte> &vertex, Pointer<Byte> &cacheLine);

		Routine *routine;
	};
}

#endif   // sw_VertexRoutine_hpp