1 | #ifndef _SHADERPROGRAM_H__
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2 | #define _SHADERPROGRAM_H__
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3 |
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4 | #include "common.h"
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5 | #include "glInterface.h"
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6 | #include "Matrix4x4.h"
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7 | #include <Cg/cg.h>
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8 | #include <Cg/cgGL.h>
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9 | #include <string>
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10 | #include <map>
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11 |
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12 |
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13 | namespace CHCDemoEngine
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14 | {
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15 |
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16 | class FrameBufferObject;
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17 | class Vector3;
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18 | class Camera;
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19 | class ShadowMap;
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20 | class DirectionalLight;
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21 | class ShaderProgram;
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22 |
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23 |
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24 | typedef std::map<std::string, int> CGParameterMap;
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25 | typedef std::vector<CGparameter> CGParameterArray;
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26 |
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27 |
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28 | /** This class represents the parameter values for a given GPU program.
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29 | */
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30 | class GPUProgramParameters
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31 | {
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32 | public:
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33 | /** Default construction.
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34 | */
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35 | GPUProgramParameters();
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36 |
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37 | /** Constructor which initialized this parameter set for a given program.
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38 | */
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39 | GPUProgramParameters(ShaderProgram *p);
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40 |
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41 | void SetProgram(ShaderProgram *p) { mProgram = p; }
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42 | /** Resets this parameter set.
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43 | */
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44 | void Reset();
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45 |
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46 |
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47 | ///////////
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48 | //-- set parameters by index
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49 |
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50 | void SetValue1f(int idx, float value);
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51 | void SetValue2f(int idx, float val1, float val2);
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52 | void SetValue3f(int idx, float val1, float val, float val3);
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53 |
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54 | void SetArray1f(int idx, float *vals, int numElements);
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55 | void SetArray2f(int idx, float *vals, int numElements);
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56 | void SetArray3f(int idx, float *vals, int numElements);
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57 | /** Sets a texture parameter.
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58 | */
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59 | void SetTexture(int idx, unsigned int tex);
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60 | /** Sets a matrix parameter.
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61 | */
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62 | void SetMatrix(int idx, const Matrix4x4 &mat);
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63 | /** Sets an array of matrices
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64 | */
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65 | void SetMatrixArray(int idx, float *vals, int numElements);
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66 |
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67 |
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68 | ////////////
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69 | //-- The following parameters are updated and set automatically once per frame.
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70 |
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71 | /** This parameter is connected to a timer that is updated once per frame.
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72 | */
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73 | void SetTimerParam(int idx);
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74 | /** This parameter is connected to the current view matrix
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75 | that is updated once per frame.
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76 | */
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77 | void SetViewMatrixParam(int idx);
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78 | /** This parameter is connected to the current view direction
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79 | that is updated once per frame.
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80 | */
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81 | void SetViewDirParam(int idx);
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82 | /** This parameter is connected to the current light direction
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83 | that is updated once per frame.
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84 | */
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85 | void SetLightDirParam(int idx);
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86 |
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87 |
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88 |
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89 | ///////////
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90 | //-- set parameters by name (slower!)
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91 |
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92 |
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93 | void SetValue1f(const std::string &name, float value);
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94 | void SetValue2f(const std::string &name, float val1, float val2);
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95 | void SetValue3f(const std::string &name, float val1, float val, float val3);
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96 |
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97 | void SetArray1f(const std::string &name, float *vals, int numElements);
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98 | void SetArray2f(const std::string &name, float *vals, int numElements);
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99 | void SetArray3f(const std::string &name, float *vals, int numElements);
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100 |
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101 | /** Sets the texture parameter.
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102 | */
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103 | void SetTexture(const std::string &name, unsigned int tex);
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104 | /** Sets the matrix parameter.
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105 | */
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106 | void SetMatrix(const std::string &name, const Matrix4x4 &mat);
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107 | /** Sets an array of matrices
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108 | */
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109 | void SetMatrixArray(const std::string &name, float *vals, int numElements);
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110 | /** Feeds the shader program with the parameter values.
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111 | */
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112 | void UpdateParameters();
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113 | /** Function should be called once per frame to update frame related parameters.
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114 | */
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115 | static void InitFrame(Camera *cam, DirectionalLight *light);
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116 |
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117 |
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118 | protected:
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119 |
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120 | struct FloatParam
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121 | {
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122 | FloatParam(): mValid(false), mNumComponents(0) {}
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123 |
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124 | FloatParam(float *val, int comp):
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125 | mNumComponents(comp), mValid(true)
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126 | {
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127 | for (int i = 0; i < mNumComponents; ++ i)
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128 | mValues[i] = val[i];
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129 | }
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130 |
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131 | bool mValid;
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132 | float mValues[4];
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133 | int mNumComponents;
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134 | };
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135 |
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136 | struct IntParam
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137 | {
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138 | IntParam(): mValid(false) {}
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139 | IntParam(float val): mValue(val), mValid(true) {}
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140 |
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141 | bool mValid;
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142 | float mValue;
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143 | };
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144 |
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145 | struct MatrixParam
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146 | {
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147 | MatrixParam(): mValue(IdentityMatrix()), mValid(false) {}
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148 |
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149 | MatrixParam(const Matrix4x4 &mat): mValue(mat), mValid(true)
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150 | {}
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151 |
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152 | bool mValid;
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153 | Matrix4x4 mValue;
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154 | };
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155 |
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156 | struct ArrayParam
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157 | {
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158 | ArrayParam(): mValues(NULL), mNumEntries(0), mNumComponents(0), mValid(false) {}
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159 | ArrayParam(float *val, int comp, int numEntries):
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160 | mValues(val), mNumComponents(comp), mNumEntries(numEntries), mValid(true)
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161 | {}
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162 |
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163 | bool mValid;
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164 | float *mValues;
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165 |
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166 | int mNumEntries;
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167 | int mNumComponents;
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168 | };
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169 |
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170 |
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171 | struct MatrixArrayParam
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172 | {
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173 | MatrixArrayParam(): mValues(NULL), mNumEntries(0), mValid(false) {}
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174 | MatrixArrayParam(float *mats, int numEntries):
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175 | mValues(mats), mNumEntries(numEntries), mValid(true)
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176 | {}
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177 |
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178 | bool mValid;
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179 | float *mValues;
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180 |
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181 | int mNumEntries;
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182 | };
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183 |
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184 |
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185 | /// the program this parameter set is connected to
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186 | ShaderProgram *mProgram;
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187 |
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188 | int mTimerParam;
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189 | int mViewDirParam;
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190 | int mLightDirParam;
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191 | int mViewMatrixParam;
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192 |
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193 | std::vector<FloatParam> mFloats;
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194 | std::vector<IntParam> mTextures;
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195 | std::vector<MatrixParam> mMatrices;
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196 | std::vector<ArrayParam> mArrays;
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197 | std::vector<MatrixArrayParam> mMatrixArrays;
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198 | };
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199 |
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200 |
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201 | /** This class represents a wrapper for a GPU shader program (vertex or fragment).
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202 | */
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203 | class ShaderProgram
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204 | {
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205 | friend class GPUProgramParameters;
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206 |
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207 | public:
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208 |
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209 | ShaderProgram(CGprogram program): mProgram(program) {}
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210 |
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211 | ShaderProgram(CGcontext context,
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212 | const std::string &filename,
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213 | CGprofile profile,
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214 | const std::string &functionName);
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215 |
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216 | ~ShaderProgram() { if (mProgram != NULL) cgDestroyProgram(mProgram); }
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217 |
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218 | /** Assigns a parameter to the specified index.
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219 | */
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220 | CGparameter AddParameter(const std::string &name, int idx);
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221 | /** Comvenience method that adds an array of parameters beginning with
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222 | index i of size numElements
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223 | */
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224 | void AddParameters(std::string params[], int startIdx, int numElements);
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225 |
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226 | //////////////
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227 | //-- set shader parameters per index
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228 |
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229 | void SetValue1f(int idx, float value);
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230 | void SetValue2f(int idx, float val1, float val2);
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231 | void SetValue3f(int idx, float val1, float val, float val3);
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232 |
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233 | void SetArray1f(int idx, float *vals, int numElements);
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234 | void SetArray2f(int idx, float *vals, int numElements);
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235 | void SetArray3f(int idx, float *vals, int numElements);
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236 | void SetMatrix(int idx, const Matrix4x4 &mat);
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237 | void SetMatrixArray(int idx, float *mats, int numElements);
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238 |
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239 | void SetTexture(int idx, unsigned int tex);
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240 |
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241 |
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242 | ////////////
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243 | //-- set shader parameters per parameter name (slow!)
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244 |
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245 | /// Float parameters
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246 | void SetValue1f(const std::string &name, float value);
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247 | void SetValue2f(const std::string &name, float val1, float val2);
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248 | void SetValue3f(const std::string &name, float val1, float val, float val3);
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249 | /// Array parameters
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250 | void SetArray1f(const std::string &name, float *vals, int numElements);
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251 | void SetArray2f(const std::string &name, float *vals, int numElements);
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252 | void SetArray3f(const std::string &name, float *vals, int numElements);
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253 | /** Sets a matrix parameter
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254 | */
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255 | void SetMatrix(const std::string &name, const Matrix4x4 &mat);
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256 | /** Sets array of matrices
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257 | */
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258 | void SetMatrixArray(const std::string &name, float *mats, int numElements);
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259 | /** Sets the texture parameter.
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260 | */
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261 | void SetTexture(const std::string &name, unsigned int tex);
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262 | /** Binds the program.
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263 | */
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264 | void Bind();
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265 | /** Returns true if this program is valid.
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266 | */
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267 | inline bool IsValid() const { return mProgram != NULL; }
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268 | /** Releases all texture resources.
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269 | */
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270 | void Release();
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271 |
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272 |
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273 | protected:
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274 |
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275 | inline int GetParamIdxByName(const std::string &name) const;
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276 |
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277 | inline CGparameter GetParameter(int idx) const;
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278 |
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279 | CGparameter GetOrCreateParameter(const std::string &name);
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280 |
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281 |
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282 | ///////////////
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283 |
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284 | CGParameterMap mParamHash;
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285 |
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286 | CGprogram mProgram;
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287 |
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288 | CGParameterArray mTextureParams;
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289 | CGParameterArray mParameters;
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290 | };
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291 |
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292 |
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293 |
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294 | } // namespace
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295 |
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296 | #endif // _ShaderProgram_H__ |
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