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_VertexShader_hpp
16#define sw_VertexShader_hpp
17
18#include "Shader.hpp"
19#include "Main/Config.hpp"
20
21namespace sw
22{
23 class VertexShader : public Shader
24 {
25 public:
26 enum AttribType : unsigned char
27 {
28 ATTRIBTYPE_FLOAT,
29 ATTRIBTYPE_INT,
30 ATTRIBTYPE_UINT,
31
32 ATTRIBTYPE_LAST = ATTRIBTYPE_UINT
33 };
34
35 explicit VertexShader(const VertexShader *vs = 0);
36 explicit VertexShader(const unsigned long *token);
37
38 virtual ~VertexShader();
39
40 static int validate(const unsigned long *const token); // Returns number of instructions if valid
41 bool containsTextureSampling() const;
42
43 void setInput(int inputIdx, const Semantic& semantic, AttribType attribType = ATTRIBTYPE_FLOAT);
44 void setOutput(int outputIdx, int nbComponents, const Semantic& semantic);
45 void setPositionRegister(int posReg);
46 void setPointSizeRegister(int ptSizeReg);
47 void declareInstanceId() { instanceIdDeclared = true; }
48 void declareVertexId() { vertexIdDeclared = true; }
49
50 const Semantic& getInput(int inputIdx) const;
51 const Semantic& getOutput(int outputIdx, int component) const;
52 AttribType getAttribType(int inputIndex) const;
53 int getPositionRegister() const { return positionRegister; }
54 int getPointSizeRegister() const { return pointSizeRegister; }
55 bool isInstanceIdDeclared() const { return instanceIdDeclared; }
56 bool isVertexIdDeclared() const { return vertexIdDeclared; }
57
58 private:
59 void analyze();
60 void analyzeInput();
61 void analyzeOutput();
62 void analyzeTextureSampling();
63
64 Semantic input[MAX_VERTEX_INPUTS];
65 Semantic output[MAX_VERTEX_OUTPUTS][4];
66
67 AttribType attribType[MAX_VERTEX_INPUTS];
68
69 int positionRegister;
70 int pointSizeRegister;
71
72 bool instanceIdDeclared;
73 bool vertexIdDeclared;
74 bool textureSampling;
75 };
76}
77
78#endif // sw_VertexShader_hpp
79