1 | #include <iostream>
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2 | #include "FrameBufferObject.h"
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3 | #include "glInterface.h"
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4 |
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5 | using namespace std;
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6 |
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7 |
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8 | namespace CHCDemoEngine
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9 | {
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10 |
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11 | int FrameBufferObject::sCurrentFbo = -1;
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12 |
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13 |
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14 | void PrintFBOStatus(GLenum status)
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15 | {
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16 | switch(status)
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17 | {
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18 | case GL_FRAMEBUFFER_COMPLETE_EXT:
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19 | //cout << "frame buffer object complete" << endl;
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20 | break;
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21 | case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT:
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22 | cerr << "incomplete attachment" << endl;
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23 | break;
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24 | case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT:
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25 | cerr << "missing attachment" << endl;
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26 | break;
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27 | case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT:
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28 | cerr << "incomplete dimensions" << endl;
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29 | break;
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30 | case GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT:
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31 | cerr << "incomplete formats" << endl;
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32 | break;
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33 | case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT:
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34 | cerr << "incomplete draw buffer" << endl;
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35 | break;
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36 | case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT:
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37 | cerr << "incomplete read buffer" << endl;
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38 | break;
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39 | case GL_FRAMEBUFFER_UNSUPPORTED_EXT:
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40 | cerr << "framebuffer unsupported" << endl;
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41 | break;
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42 | default:
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43 | cerr << "unknown status code " << status << endl;
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44 | }
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45 | }
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46 |
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47 |
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48 | ColorBufferObject::ColorBufferObject(int w, int h,
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49 | int attachment_idx,
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50 | FORMAT format,
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51 | WRAP_TYPE wrapType,
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52 | FILTER_TYPE filterType,
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53 | FILTER_TYPE filterTypeMipMap
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54 | )
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55 | {
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56 | Init(w, h, attachment_idx, format, wrapType, filterType, true, filterTypeMipMap);
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57 | }
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58 |
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59 |
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60 | ColorBufferObject::ColorBufferObject(int w, int h,
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61 | int attachment_idx,
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62 | FORMAT format,
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63 | WRAP_TYPE wrapType,
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64 | FILTER_TYPE filterType
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65 | )
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66 | {
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67 | Init(w, h, attachment_idx, format, wrapType, filterType, false, FILTER_NEAREST);
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68 | }
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69 |
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70 |
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71 | ColorBufferObject::~ColorBufferObject()
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72 | {
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73 | glDeleteRenderbuffersEXT(1, &mId);
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74 | glDeleteTextures(1, &mTexId);
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75 | }
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76 |
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77 |
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78 | void ColorBufferObject::Init(int w, int h,
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79 | int attachment_idx,
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80 | FORMAT format,
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81 | WRAP_TYPE wrapType,
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82 | FILTER_TYPE filterType,
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83 | bool useMipMap,
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84 | FILTER_TYPE filterTypeMipMap
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85 | )
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86 | {
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87 | mWidth = w;
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88 | mHeight = h;
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89 |
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90 | int components = GL_RGBA;
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91 |
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92 | switch (format)
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93 | {
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94 | case RGB_UBYTE:
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95 | mGlFormat = GL_UNSIGNED_BYTE; mInternalFormat = GL_RGB8;
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96 | components = GL_RGB;
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97 | break;
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98 | case RGBA_UBYTE:
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99 | mGlFormat = GL_UNSIGNED_BYTE; mInternalFormat = GL_RGBA8; break;
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100 | case RGBA_FLOAT_16:
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101 | mGlFormat = GL_FLOAT; mInternalFormat = GL_RGBA16F_ARB; break;
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102 | case RGB_FLOAT_32:
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103 | mGlFormat = GL_FLOAT; mInternalFormat = GL_RGB32F_ARB;
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104 | components = GL_RGB;
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105 | break;
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106 | case RGBA_FLOAT_32:
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107 | mGlFormat = GL_FLOAT; mInternalFormat = GL_RGBA32F_ARB; break;
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108 | default:
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109 | mGlFormat = GL_UNSIGNED_BYTE; mInternalFormat = GL_RGBA8;
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110 | cerr << "should not come here" << endl;
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111 | }
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112 |
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113 |
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114 | glGenRenderbuffersEXT(1, &mId);
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115 | glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, mId);
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116 |
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117 | glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, mInternalFormat, w, h);
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118 | glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, mrt[attachment_idx], GL_RENDERBUFFER_EXT, mId);
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119 |
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120 |
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121 | glGenTextures(1, &mTexId);
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122 | glBindTexture(GL_TEXTURE_2D, mTexId);
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123 | glTexImage2D(GL_TEXTURE_2D, 0, mInternalFormat, w, h, 0, components, mGlFormat, NULL);
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124 |
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125 | glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, mrt[attachment_idx], GL_TEXTURE_2D, mTexId, 0);
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126 |
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127 | GLuint minfilterParam;
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128 | GLuint magfilterParam;
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129 |
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130 | if (filterType == FILTER_NEAREST)
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131 | magfilterParam = GL_NEAREST;
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132 | else // FILTER_LINEAR
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133 | magfilterParam = GL_LINEAR;
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134 |
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135 | if (!useMipMap)
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136 | {
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137 | if (filterType == FILTER_NEAREST)
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138 | minfilterParam = GL_NEAREST;
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139 | else // FILTER_LINEAR
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140 | minfilterParam = GL_LINEAR;
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141 | }
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142 | else
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143 | {
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144 | if (filterType == FILTER_NEAREST)
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145 | {
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146 | if (filterTypeMipMap == FILTER_NEAREST)
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147 | minfilterParam = GL_NEAREST_MIPMAP_NEAREST;
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148 | else // FILTER_LINEAR
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149 | minfilterParam = GL_NEAREST_MIPMAP_LINEAR;
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150 | }
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151 | else // FILTER_LINEAR
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152 | {
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153 | if (filterTypeMipMap == FILTER_NEAREST)
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154 | minfilterParam = GL_LINEAR_MIPMAP_NEAREST;
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155 | else // FILTER_LINEAR
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156 | minfilterParam = GL_LINEAR_MIPMAP_LINEAR;
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157 | }
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158 | }
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159 |
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160 | GLuint wrapParam;
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161 |
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162 | switch (wrapType)
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163 | {
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164 | case WRAP_REPEAT:
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165 | wrapParam = GL_REPEAT; break;
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166 | case WRAP_CLAMP_TO_EDGE:
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167 | wrapParam = GL_CLAMP_TO_EDGE; break;
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168 | }
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169 |
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170 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, magfilterParam);
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171 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, minfilterParam);
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172 |
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173 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrapParam);
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174 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrapParam);
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175 |
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176 | if (useMipMap)
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177 | {
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178 | glGenerateMipmapEXT(GL_TEXTURE_2D);
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179 | }
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180 |
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181 | // print status
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182 | PrintFBOStatus(glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT));
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183 | }
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184 |
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185 |
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186 |
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187 | void *ColorBufferObject::ReadTexture() const
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188 | {
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189 | int bytes = 0;
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190 |
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191 | switch (mInternalFormat)
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192 | {
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193 | case GL_RGB8:
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194 | bytes = 3; break;
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195 | case GL_RGBA8:
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196 | bytes = 4; break;
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197 | case GL_RGBA16F_ARB:
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198 | bytes = 16; break;
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199 | case GL_RGB32F_ARB:
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200 | bytes = 24; break;
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201 | case GL_RGBA32F_ARB:
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202 | bytes = 32; break;
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203 | default:
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204 | cerr << "should not come here" << endl;
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205 | }
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206 |
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207 |
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208 | glBindTexture(GL_TEXTURE_2D, mTexId);
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209 |
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210 | /*GLint width, height;
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211 | glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &width);
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212 | glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &height);
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213 | cout << "w: " << width << "h: " << height << endl;
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214 | */
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215 |
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216 | unsigned char *data = new unsigned char[bytes * 4 * mWidth * mHeight];
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217 |
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218 | glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_FLOAT, data);
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219 |
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220 | glBindTexture(GL_TEXTURE_2D, 0);
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221 | glDisable(GL_TEXTURE_2D);
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222 |
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223 | return data;
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224 | }
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225 |
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226 |
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227 | /*****************************************************************/
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228 | /* FrameBufferObject implementation */
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229 | /*****************************************************************/
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230 |
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231 |
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232 | FrameBufferObject::FrameBufferObject(int w, int h, DEPTH_FORMAT d, bool useDepthTex)
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233 | : mWidth(w), mHeight(h), mDepthTexId(0)
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234 | {
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235 | glGenFramebuffersEXT(1, &mId);
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236 |
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237 | Bind();
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238 | ///////////
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239 | //-- create depth buffer
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240 |
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241 | if (d != DEPTH_NONE)
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242 | {
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243 | glGenRenderbuffersEXT(1, &mDepthId);
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244 | glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, mDepthId);
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245 |
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246 | GLuint depthFormat;
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247 |
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248 | switch (d)
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249 | {
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250 | case DEPTH_16:
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251 | depthFormat = GL_DEPTH_COMPONENT16; break;
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252 | case DEPTH_24:
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253 | depthFormat = GL_DEPTH_COMPONENT24; break;
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254 | case DEPTH_32:
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255 | depthFormat = GL_DEPTH_COMPONENT32; break;
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256 | default:
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257 | cerr << "should not come here" << endl;
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258 | }
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259 |
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260 | glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, depthFormat, w, h);
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261 |
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262 |
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263 | glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, mDepthId);
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264 |
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265 | if (useDepthTex)
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266 | {
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267 | glGenTextures(1, &mDepthTexId);
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268 | glBindTexture(GL_TEXTURE_2D, mDepthTexId);
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269 |
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270 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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271 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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272 |
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273 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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274 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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275 |
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276 | glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
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277 |
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278 | glTexImage2D(GL_TEXTURE_2D, 0, depthFormat, mWidth, mHeight, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
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279 |
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280 | glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_TEXTURE_2D, mDepthTexId, 0);
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281 | }
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282 | }
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283 |
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284 | Release();
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285 | }
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286 |
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287 |
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288 | FrameBufferObject::~FrameBufferObject()
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289 | {
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290 | glDeleteFramebuffersEXT(1, &mId);
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291 | glDeleteRenderbuffersEXT(1, &mDepthId);
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292 |
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293 | if (mDepthTexId) glDeleteTextures(1, &mDepthTexId);
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294 |
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295 | CLEAR_CONTAINER(mColorBuffers);
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296 | }
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297 |
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298 |
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299 | int FrameBufferObject::AddColorBuffer(ColorBufferObject::FORMAT col,
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300 | ColorBufferObject::WRAP_TYPE wrapType,
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301 | ColorBufferObject::FILTER_TYPE filterType,
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302 | ColorBufferObject::FILTER_TYPE filterTypeMipMap)
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303 | {
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304 | Bind();
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305 |
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306 | const int idx = (int)mColorBuffers.size();
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307 |
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308 | ColorBufferObject *colorBuf =
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309 | new ColorBufferObject(mWidth, mHeight, idx, col, wrapType, filterType, filterTypeMipMap);
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310 |
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311 | mColorBuffers.push_back(colorBuf);
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312 |
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313 | Release();
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314 |
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315 | return idx;
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316 | }
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317 |
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318 |
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319 |
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320 | int FrameBufferObject::AddColorBuffer(ColorBufferObject::FORMAT col,
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321 | ColorBufferObject::WRAP_TYPE wrapType,
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322 | ColorBufferObject::FILTER_TYPE filterType)
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323 | {
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324 | Bind();
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325 |
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326 | const int idx = (int)mColorBuffers.size();
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327 |
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328 | ColorBufferObject *colorBuf =
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329 | new ColorBufferObject(mWidth, mHeight, idx, col, wrapType, filterType);
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330 |
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331 | mColorBuffers.push_back(colorBuf);
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332 |
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333 | Release();
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334 |
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335 | return idx;
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336 | }
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337 |
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338 |
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339 | void FrameBufferObject::Bind() const
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340 | {
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341 | if (sCurrentFbo != mId)
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342 | {
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343 | sCurrentFbo = mId;
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344 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, mId);
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345 | }
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346 | }
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347 |
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348 |
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349 | void FrameBufferObject::Release()
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350 | {
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351 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
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352 | sCurrentFbo = -1;
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353 | }
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354 |
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355 |
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356 | } // namespace
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