1 | #include "DeferredShader.h"
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2 | #include "FrameBufferObject.h"
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3 | #include "RenderState.h"
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4 |
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5 |
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6 | using namespace std;
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7 |
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8 |
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9 | namespace CHCDemoEngine
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10 | {
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11 |
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12 |
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13 | static void PrintGLerror(char *msg)
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14 | {
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15 | GLenum errCode;
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16 | const GLubyte *errStr;
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17 |
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18 | if ((errCode = glGetError()) != GL_NO_ERROR)
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19 | {
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20 | errStr = gluErrorString(errCode);
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21 | fprintf(stderr,"OpenGL ERROR: %s: %s\n", errStr, msg);
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22 | }
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23 | }
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24 |
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25 |
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26 |
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27 | static CGprogram sCgDeferredProgram;
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28 | static CGprogram sCgAntiAliasingProgram;
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29 |
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30 |
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31 | static CGparameter sColorsTexParam;
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32 | static CGparameter sPositionsTexParam;
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33 | static CGparameter sNormalsTexParam;
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34 |
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35 | static CGparameter sColorsTexAntiAliasingParam;
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36 | static CGparameter sNormalsTexAntiAliasingParam;
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37 |
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38 |
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39 | DeferredShader::DeferredShader(int w, int h):
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40 | mWidth(w), mHeight(h)
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41 | {
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42 | mFbo = new FrameBufferObject(w, h, FrameBufferObject::DEPTH_NONE);
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43 | // the diffuse color buffer
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44 | mFbo->AddColorBuffer(ColorBufferObject::BUFFER_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_LINEAR, false);
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45 | }
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46 |
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47 |
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48 | DeferredShader::~DeferredShader()
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49 | {
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50 | if (sCgDeferredProgram)
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51 | cgDestroyProgram(sCgDeferredProgram);
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52 | }
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53 |
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54 |
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55 | void DeferredShader::Init(CGcontext context)
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56 | {
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57 | sCgDeferredProgram =
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58 | cgCreateProgramFromFile(context,
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59 | CG_SOURCE,
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60 | "src/shaders/deferred.cg",
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61 | RenderState::sCgFragmentProfile,
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62 | "main",
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63 | NULL);
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64 |
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65 | if (sCgDeferredProgram != NULL)
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66 | {
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67 | cgGLLoadProgram(sCgDeferredProgram);
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68 |
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69 | // we need size of texture for scaling
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70 | sPositionsTexParam = cgGetNamedParameter(sCgDeferredProgram, "positions");
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71 | sColorsTexParam = cgGetNamedParameter(sCgDeferredProgram, "colors");
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72 | sNormalsTexParam = cgGetNamedParameter(sCgDeferredProgram, "normals");
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73 | }
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74 | else
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75 | cerr << "deferred program failed to load" << endl;
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76 |
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77 | sCgAntiAliasingProgram =
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78 | cgCreateProgramFromFile(context,
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79 | CG_SOURCE,
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80 | "src/shaders/antialiasing.cg",
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81 | RenderState::sCgFragmentProfile,
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82 | "main",
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83 | NULL);
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84 |
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85 | if (sCgAntiAliasingProgram != NULL)
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86 | {
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87 | cgGLLoadProgram(sCgAntiAliasingProgram);
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88 |
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89 | sColorsTexAntiAliasingParam = cgGetNamedParameter(sCgAntiAliasingProgram, "colors");
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90 | sNormalsTexAntiAliasingParam = cgGetNamedParameter(sCgAntiAliasingProgram, "normals");
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91 | }
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92 | else
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93 | cerr << "antialiasing program failed to load" << endl;
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94 |
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95 |
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96 | PrintGLerror("init");
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97 | }
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98 |
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99 |
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100 | void DeferredShader::Render(FrameBufferObject *fbo)
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101 | {
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102 | FirstPass(fbo);
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103 | AntiAliasing(fbo);
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104 | }
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105 |
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106 |
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107 | void DeferredShader::FirstPass(FrameBufferObject *fbo)
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108 | {
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109 | GLuint colorsTex = fbo->GetColorBuffer(0)->GetTexture();
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110 | GLuint positionsTex = fbo->GetColorBuffer(1)->GetTexture();
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111 | GLuint normalsTex = fbo->GetColorBuffer(2)->GetTexture();
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112 |
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113 | mFbo->Bind();
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114 |
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115 | glPushAttrib(GL_VIEWPORT_BIT);
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116 | glViewport(0, 0, mWidth, mHeight);
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117 |
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118 | glDisable(GL_ALPHA_TEST);
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119 | glDisable(GL_TEXTURE_2D);
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120 | glDisable(GL_LIGHTING);
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121 |
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122 | glMatrixMode(GL_PROJECTION);
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123 | glPushMatrix();
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124 | glLoadIdentity();
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125 |
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126 | glMatrixMode(GL_MODELVIEW);
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127 | glPushMatrix();
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128 | glLoadIdentity();
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129 |
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130 | const float offs = 0.5f;
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131 |
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132 | glOrtho(-offs, offs, -offs, offs, 0, 1);
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133 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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134 |
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135 | cgGLEnableProfile(RenderState::sCgFragmentProfile);
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136 |
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137 | cgGLBindProgram(sCgDeferredProgram);
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138 |
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139 | cgGLSetTextureParameter(sColorsTexParam, colorsTex);
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140 | cgGLEnableTextureParameter(sColorsTexParam);
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141 |
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142 | cgGLSetTextureParameter(sPositionsTexParam, positionsTex);
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143 | cgGLEnableTextureParameter(sPositionsTexParam);
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144 |
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145 | cgGLSetTextureParameter(sNormalsTexParam, normalsTex);
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146 | cgGLEnableTextureParameter(sNormalsTexParam);
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147 |
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148 | glColor3f(1.0f, 1.0f, 1.0f);
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149 |
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150 | glBegin(GL_QUADS);
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151 |
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152 | float offs2 = 0.5f;
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153 |
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154 | glTexCoord2f(0, 0); glVertex3f(-offs2, -offs2, -0.5f);
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155 | glTexCoord2f(1, 0); glVertex3f( offs2, -offs2, -0.5f);
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156 | glTexCoord2f(1, 1); glVertex3f( offs2, offs2, -0.5f);
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157 | glTexCoord2f(0, 1); glVertex3f(-offs2, offs2, -0.5f);
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158 |
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159 | glEnd();
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160 |
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161 | cgGLDisableTextureParameter(sColorsTexParam);
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162 | cgGLDisableTextureParameter(sPositionsTexParam);
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163 | cgGLDisableTextureParameter(sNormalsTexParam);
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164 |
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165 | cgGLDisableProfile(RenderState::sCgFragmentProfile);
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166 |
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167 | glEnable(GL_LIGHTING);
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168 | glDisable(GL_TEXTURE_2D);
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169 |
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170 | glMatrixMode(GL_PROJECTION);
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171 | glPopMatrix();
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172 |
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173 | glMatrixMode(GL_MODELVIEW);
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174 | glPopMatrix();
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175 |
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176 | glPopAttrib();
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177 |
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178 | FrameBufferObject::Release();
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179 |
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180 | PrintGLerror("deferred shading");
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181 | }
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182 |
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183 |
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184 | static void SetVertex(float x, float y, float x_offs, float y_offs)
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185 | {
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186 | glMultiTexCoord2fARB(GL_TEXTURE0_ARB, x, y); // center
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187 | glMultiTexCoord2fARB(GL_TEXTURE1_ARB, x - x_offs, y + y_offs); // left top
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188 | glMultiTexCoord2fARB(GL_TEXTURE2_ARB, x + x_offs, y - y_offs); // right bottom
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189 | glMultiTexCoord2fARB(GL_TEXTURE3_ARB, x + x_offs, y + y_offs); // right top
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190 | glMultiTexCoord2fARB(GL_TEXTURE4_ARB, x - x_offs, y - y_offs); // left bottom
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191 |
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192 | glMultiTexCoord4fARB(GL_TEXTURE5_ARB, x - x_offs, y, x + x_offs, y); // left right
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193 | glMultiTexCoord4fARB(GL_TEXTURE6_ARB, x, y + y_offs, x, y - y_offs); // top bottom
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194 |
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195 | glVertex3f(x - 0.5f, y - 0.5f, -0.5f);
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196 | }
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197 |
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198 |
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199 | void DeferredShader::AntiAliasing(FrameBufferObject *fbo)
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200 | {
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201 | GLuint colorsTex = mFbo->GetColorBuffer(0)->GetTexture();
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202 | GLuint normalsTex = fbo->GetColorBuffer(2)->GetTexture();
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203 |
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204 | glPushAttrib(GL_VIEWPORT_BIT);
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205 | glViewport(0, 0, mWidth, mHeight);
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206 |
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207 | glDisable(GL_ALPHA_TEST);
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208 | glDisable(GL_TEXTURE_2D);
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209 | glDisable(GL_LIGHTING);
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210 |
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211 | glMatrixMode(GL_PROJECTION);
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212 | glPushMatrix();
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213 | glLoadIdentity();
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214 |
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215 | glMatrixMode(GL_MODELVIEW);
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216 | glPushMatrix();
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217 | glLoadIdentity();
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218 |
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219 | const float offs = 0.5f;
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220 |
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221 | glOrtho(-offs, offs, -offs, offs, 0, 1);
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222 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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223 |
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224 | cgGLEnableProfile(RenderState::sCgFragmentProfile);
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225 |
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226 | cgGLBindProgram(sCgAntiAliasingProgram);
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227 |
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228 | cgGLSetTextureParameter(sColorsTexAntiAliasingParam, colorsTex);
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229 | cgGLEnableTextureParameter(sColorsTexAntiAliasingParam);
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230 |
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231 | cgGLSetTextureParameter(sNormalsTexAntiAliasingParam, normalsTex);
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232 | cgGLEnableTextureParameter(sNormalsTexAntiAliasingParam);
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233 |
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234 | glColor3f(1.0f, 1.0f, 1.0f);
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235 |
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236 | float offs2 = 0.5f;
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237 |
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238 | glBegin(GL_QUADS);
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239 |
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240 | // the neighbouring texels
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241 | float x_offs = 1.0f / mWidth;
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242 | float y_offs = 1.0f / mHeight;
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243 |
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244 | SetVertex(0, 0, x_offs, y_offs);
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245 | SetVertex(1, 0, x_offs, y_offs);
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246 | SetVertex(1, 1, x_offs, y_offs);
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247 | SetVertex(0, 1, x_offs, y_offs);
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248 |
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249 | glEnd();
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250 |
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251 | cgGLDisableTextureParameter(sColorsTexAntiAliasingParam);
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252 | cgGLDisableTextureParameter(sNormalsTexAntiAliasingParam);
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253 |
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254 | cgGLDisableProfile(RenderState::sCgFragmentProfile);
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255 |
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256 | glEnable(GL_LIGHTING);
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257 | glDisable(GL_TEXTURE_2D);
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258 |
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259 | glMatrixMode(GL_PROJECTION);
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260 | glPopMatrix();
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261 |
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262 | glMatrixMode(GL_MODELVIEW);
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263 | glPopMatrix();
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264 |
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265 | glPopAttrib();
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266 |
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267 | PrintGLerror("deferred shading");
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268 | }
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269 |
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270 |
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271 | } // namespace
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