1// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//    http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15#ifndef sw_PixelShader_hpp
16#define sw_PixelShader_hpp
17
18#include "Shader.hpp"
19#include "Main/Config.hpp"
20
21namespace sw
22{
23	class PixelShader : public Shader
24	{
25	public:
26		explicit PixelShader(const PixelShader *ps = 0);
27		explicit PixelShader(const unsigned long *token);
28
29		virtual ~PixelShader();
30
31		static int validate(const unsigned long *const token);   // Returns number of instructions if valid
32		bool depthOverride() const;
33		bool containsKill() const;
34		bool containsCentroid() const;
35		bool usesDiffuse(int component) const;
36		bool usesSpecular(int component) const;
37		bool usesTexture(int coordinate, int component) const;
38
39		void setInput(int inputIdx, int nbComponents, const Semantic& semantic);
40		const Semantic& getInput(int inputIdx, int component) const;
41
42		void declareVPos() { vPosDeclared = true; }
43		void declareVFace() { vFaceDeclared = true; }
44		bool isVPosDeclared() const { return vPosDeclared; }
45		bool isVFaceDeclared() const { return vFaceDeclared; }
46
47	private:
48		void analyze();
49		void analyzeZOverride();
50		void analyzeKill();
51		void analyzeInterpolants();
52
53		Semantic input[MAX_FRAGMENT_INPUTS][4];
54
55		bool vPosDeclared;
56		bool vFaceDeclared;
57		bool zOverride;
58		bool kill;
59		bool centroid;
60	};
61}
62
63#endif   // sw_PixelShader_hpp
64