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1 #include <math.h>
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2 #include "texture.h"
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3 #include "image.h"
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4 #include "opengl.h"
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5 #include "imago2.h"
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6 #include "logger.h"
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7 #include "datapath.h"
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8
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9 static int glifmt_from_ifmt(unsigned int ifmt);
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10 static int glfmt_from_ifmt(unsigned int ifmt);
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11 static int gltype_from_ifmt(unsigned int ifmt);
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12
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13 static int glifmt_from_imgfmt(Image::Format fmt);
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14
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15 static unsigned int cur_target[8] = {
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16 GL_TEXTURE_2D, GL_TEXTURE_2D, GL_TEXTURE_2D, GL_TEXTURE_2D,
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17 GL_TEXTURE_2D, GL_TEXTURE_2D, GL_TEXTURE_2D, GL_TEXTURE_2D
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18 };
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19
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20 void set_texture(Texture *tex, int tunit)
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21 {
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22 if(tex) {
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23 tex->bind(tunit);
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24 } else {
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25 glActiveTexture(GL_TEXTURE0 + tunit);
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26 glBindTexture(cur_target[tunit], 0);
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27 glActiveTexture(GL_TEXTURE0);
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28 }
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29 }
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30
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31 Texture *load_texture(const char *fname)
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32 {
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33 TextureCube *texcube = new TextureCube;
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34 if(texcube->load(fname)) {
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35 return texcube;
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36 }
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37 delete texcube;
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38
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39 Texture2D *tex = new Texture2D;
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40 if(tex->load(fname)) {
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41 return tex;
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42 }
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43 delete tex;
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44 return 0;
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45 }
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46
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47 Texture::Texture()
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48 {
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49 target = 0;
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50 sz[0] = sz[1] = sz[2] = 0;
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51 texfmt = 0;
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52
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53 glGenTextures(1, &id);
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54 }
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55
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56 Texture::~Texture()
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57 {
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58 if(id) {
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59 glDeleteTextures(1, &id);
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60 }
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61 }
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62
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63 void Texture::set_wrapping(unsigned int wrap)
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64 {
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65 if(!target) {
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66 return;
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67 }
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68
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69 glBindTexture(target, id);
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70 glTexParameteri(target, GL_TEXTURE_WRAP_S, wrap);
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71 glTexParameteri(target, GL_TEXTURE_WRAP_T, wrap);
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72 }
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73
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74 void Texture::set_filtering(unsigned int filt)
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75 {
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76 unsigned int mag_filter;
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77
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78 if(!target) {
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79 return;
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80 }
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81
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82 switch(filt) {
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83 case GL_LINEAR_MIPMAP_NEAREST:
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84 case GL_LINEAR_MIPMAP_LINEAR:
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85 mag_filter = GL_LINEAR;
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86 break;
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87
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88 case GL_NEAREST_MIPMAP_NEAREST:
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89 case GL_NEAREST_MIPMAP_LINEAR:
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90 mag_filter = GL_NEAREST;
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91 break;
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92
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93 default:
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94 mag_filter = filt;
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95 }
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96
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97 set_filtering(filt, mag_filter);
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98 }
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99
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100 void Texture::set_filtering(unsigned int min_filt, unsigned int mag_filt)
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101 {
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102 glBindTexture(target, id);
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103 glTexParameteri(target, GL_TEXTURE_MIN_FILTER, min_filt);
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104 glTexParameteri(target, GL_TEXTURE_MAG_FILTER, mag_filt);
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105 }
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106
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107 unsigned int Texture::get_format() const
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108 {
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109 return texfmt;
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110 }
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111
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112 int Texture::get_size(int dim) const
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113 {
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114 if(dim < 0 || dim >= 3) {
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115 return 0;
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116 }
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117 return sz[dim];
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118 }
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119
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120 unsigned int Texture::get_id() const
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121 {
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122 return id;
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123 }
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124
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125 void Texture::bind(int tex_unit) const
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126 {
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127 glActiveTexture(GL_TEXTURE0 + tex_unit);
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128 glBindTexture(target, id);
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129 glActiveTexture(GL_TEXTURE0);
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130
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131 cur_target[tex_unit] = target;
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132 }
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133
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134
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135 // ---- Texture2D ----
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136
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137 Texture2D::Texture2D()
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138 {
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139 target = GL_TEXTURE_2D;
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140 }
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141
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142 void Texture2D::create(int xsz, int ysz, unsigned int ifmt)
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143 {
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144 int fmt = glfmt_from_ifmt(ifmt);
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145 int type = gltype_from_ifmt(ifmt);
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146
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147 glBindTexture(GL_TEXTURE_2D, id);
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148 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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149 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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150 glTexImage2D(GL_TEXTURE_2D, 0, glifmt_from_ifmt(ifmt), xsz, ysz, 0, fmt, type, 0);
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151 CHECKGLERR;
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152 sz[0] = xsz;
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153 sz[1] = ysz;
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154 texfmt = ifmt;
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155 }
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156
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157 void Texture2D::set_image(const Image &img, int idx)
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158 {
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159 texfmt = glifmt_from_imgfmt(img.get_format());
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160 unsigned int fmt = glfmt_from_ifmt(texfmt);
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161 unsigned int type = gltype_from_ifmt(texfmt);
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162
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163 sz[0] = img.get_width();
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164 sz[1] = img.get_height();
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165
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166 glBindTexture(GL_TEXTURE_2D, id);
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167 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
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168 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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169 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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170 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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171
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172 #ifdef __GLEW_H__
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173 if(GLEW_SGIS_generate_mipmap) {
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174 glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
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175 #endif
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176 glTexImage2D(GL_TEXTURE_2D, 0, texfmt, sz[0], sz[1], 0, fmt, type, img.get_pixels());
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177 #ifdef __GLEW_H__
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178 } else {
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179 gluBuild2DMipmaps(GL_TEXTURE_2D, texfmt, sz[0], sz[1], fmt, type, img.get_pixels());
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180 }
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181 #endif
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182
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183 #ifdef GL_ES_VERSION_2_0
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184 glGenerateMipmap(GL_TEXTURE_2D);
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185 #endif
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186 }
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187
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188 bool Texture2D::load(const char *fname)
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189 {
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190 Image img;
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191 if(!img.load(fname)) {
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192 error_log("failed to load 2D texture: %s\n", fname);
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193 return false;
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194 }
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195 set_image(img);
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196
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197 info_log("loaded 2D texture: %s\n", fname);
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198 return true;
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199 }
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200
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201 bool Texture2D::save(const char *fname) const
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202 {
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203 #ifndef GL_ES_VERSION_2_0
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204 unsigned char *pixels = new unsigned char[sz[0] * sz[1] * 4];
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205
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206 glBindTexture(GL_TEXTURE_2D, id);
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207 glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
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208
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209 if(img_save_pixels(fname, pixels, sz[0], sz[1]) == -1) {
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210 error_log("failed to save 2D texture: %s\n", fname);
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211 delete [] pixels;
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212 return false;
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213 }
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214
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215 info_log("saved 2D texture: %s\n", fname);
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216 delete [] pixels;
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217 return true;
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218 #else
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219 return false; // TODO
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220 #endif
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221 }
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222
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223 // ---- TextureCube ----
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224 static unsigned int cube_faces[] = {
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225 GL_TEXTURE_CUBE_MAP_POSITIVE_X,
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226 GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
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227 GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
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228 GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
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229 GL_TEXTURE_CUBE_MAP_POSITIVE_Z,
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230 GL_TEXTURE_CUBE_MAP_NEGATIVE_Z
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231 };
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232
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233 TextureCube::TextureCube()
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234 {
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235 target = GL_TEXTURE_CUBE_MAP;
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236 }
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237
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238 void TextureCube::create(int xsz, int ysz, unsigned int ifmt)
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239 {
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240 if(xsz != ysz) {
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241 error_log("trying to create cubemap with different width and height (%dx%d)\n", xsz, ysz);
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242 return;
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243 }
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244
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245 texfmt = ifmt;
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246
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247 glBindTexture(GL_TEXTURE_CUBE_MAP, id);
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248 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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249 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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250 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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251 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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252 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
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253
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254 for(int i=0; i<6; i++) {
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255 glTexImage2D(cube_faces[i], 0, ifmt, xsz, ysz, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
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256 }
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257 }
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258
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259 void TextureCube::set_image(const Image &img, int idx)
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260 {
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261 texfmt = glifmt_from_imgfmt(img.get_format());
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262 unsigned int fmt = glfmt_from_ifmt(texfmt);
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263 unsigned int type = gltype_from_ifmt(texfmt);
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264
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265 sz[0] = img.get_width();
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266 sz[1] = img.get_height();
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267
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268 glBindTexture(GL_TEXTURE_CUBE_MAP, id);
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269 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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270 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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271 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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272 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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273 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
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274
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275 glTexImage2D(cube_faces[idx], 0, texfmt, sz[0], sz[1], 0, fmt, type, img.get_pixels());
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276 }
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277
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278 bool TextureCube::load(const char *fname)
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279 {
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280 static const float one_third = 1.0 / 3.0;
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281 static const float two_thirds = 2.0 / 3.0;
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282 static const float hcross[2][6] = {
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283 {0.5, 0.0, 0.25, 0.25, 0.25, 0.75}, {one_third, one_third, 0.0, two_thirds, one_third, one_third} };
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284 static const float vcross[2][6] = {
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285 {two_thirds, 0.0, one_third, one_third, one_third, one_third}, {0.25, 0.25, 0.0, 0.5, 0.25, 0.75} };
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286 static const float hsix[2][6] = {
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287 {0.0, 0.0, one_third, one_third, two_thirds, two_thirds}, {0.0, 0.5, 0.0, 0.5, 0.0, 0.5} };
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288
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289 Image img;
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290 if(!img.load(fname)) {
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291 return false;
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292 }
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293
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294 int xsz = img.get_width();
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295 int ysz = img.get_height();
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296
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297 if(xsz / 4 == ysz / 3) {
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298 // horizontal cross, assume the vertical bit is center-left
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299 return load_multi(img, hcross[0], hcross[1], xsz / 4);
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300 }
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301 if(xsz / 3 == ysz / 4) {
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302 // vertical cross, assume the horizontal bit is center-top (180-rotated image 5)
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303 return load_multi(img, vcross[0], vcross[1], ysz / 4, (1 << 5));
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304 }
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305 if(xsz / 3 == ysz / 2) {
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306 // horizontal sixpack
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307 return load_multi(img, hsix[0], hsix[1], ysz / 2);
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308 }
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309
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310 return false;
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311 }
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312
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313 bool TextureCube::save(const char *fname) const
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314 {
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315 return false; // TODO
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316 }
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317
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318 bool TextureCube::load_multi(const Image &img, const float *xoffsets, const float *yoffsets, float sz,
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319 unsigned int rotmask)
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320 {
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321 for(int i=0; i<6; i++) {
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322 Image face;
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323
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324 int xoffs = xoffsets[i] * img.get_width();
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325 int yoffs = yoffsets[i] * img.get_height();
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326
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327 if(!face.set_pixels(sz, sz, img.get_pixels(), xoffs, yoffs, img.get_width(), img.get_format())) {
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328 return false;
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329 }
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330
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331 if(rotmask & (1 << i)) {
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332 face.rotate_180();
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333 }
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334 set_image(face, i);
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335 }
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336 return true;
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337 }
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338
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339 static int glifmt_from_ifmt(unsigned int ifmt)
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340 {
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341 #ifdef GL_ES_VERSION_2_0
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342 switch(ifmt) {
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343 case GL_LUMINANCE16F:
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344 case GL_LUMINANCE32F:
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345 ifmt = GL_LUMINANCE;
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346 break;
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347
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348 case GL_RGB16F:
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349 case GL_RGB32F:
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350 ifmt = GL_RGB;
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351 break;
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352
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353 case GL_RGBA16F:
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354 case GL_RGBA32F:
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355 ifmt = GL_RGBA;
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356 break;
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357
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358 default:
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359 break;
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360 }
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361 #endif
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nuclear@0
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362 return ifmt; // by default just pass it through...
|
nuclear@0
|
363 }
|
nuclear@0
|
364
|
nuclear@0
|
365 static int glfmt_from_ifmt(unsigned int ifmt)
|
nuclear@0
|
366 {
|
nuclear@0
|
367 switch(ifmt) {
|
nuclear@0
|
368 case GL_LUMINANCE16F:
|
nuclear@0
|
369 case GL_LUMINANCE32F:
|
nuclear@0
|
370 return GL_LUMINANCE;
|
nuclear@0
|
371
|
nuclear@0
|
372 case GL_RGB16F:
|
nuclear@0
|
373 case GL_RGB32F:
|
nuclear@0
|
374 return GL_RGB;
|
nuclear@0
|
375
|
nuclear@0
|
376 case GL_RGBA16F:
|
nuclear@0
|
377 case GL_RGBA32F:
|
nuclear@0
|
378 return GL_RGBA;
|
nuclear@0
|
379
|
nuclear@0
|
380 default:
|
nuclear@0
|
381 break;
|
nuclear@0
|
382 }
|
nuclear@0
|
383 return ifmt;
|
nuclear@0
|
384 }
|
nuclear@0
|
385
|
nuclear@0
|
386 static int gltype_from_ifmt(unsigned int ifmt)
|
nuclear@0
|
387 {
|
nuclear@0
|
388 switch(ifmt) {
|
nuclear@0
|
389 case GL_RGB16F:
|
nuclear@0
|
390 case GL_RGBA16F:
|
nuclear@0
|
391 case GL_LUMINANCE16F:
|
nuclear@0
|
392 #ifdef GL_ES_VERSION_2_0
|
nuclear@0
|
393 return GL_HALF_FLOAT_OES;
|
nuclear@0
|
394 #endif
|
nuclear@0
|
395 case GL_RGB32F:
|
nuclear@0
|
396 case GL_RGBA32F:
|
nuclear@0
|
397 case GL_LUMINANCE32F:
|
nuclear@0
|
398 return GL_FLOAT;
|
nuclear@0
|
399
|
nuclear@0
|
400 default:
|
nuclear@0
|
401 break;
|
nuclear@0
|
402 }
|
nuclear@0
|
403 return GL_UNSIGNED_BYTE;
|
nuclear@0
|
404 }
|
nuclear@0
|
405
|
nuclear@0
|
406 static int glifmt_from_imgfmt(Image::Format fmt)
|
nuclear@0
|
407 {
|
nuclear@0
|
408 switch(fmt) {
|
nuclear@0
|
409 case Image::FMT_GREY:
|
nuclear@0
|
410 return GL_LUMINANCE;
|
nuclear@0
|
411 case Image::FMT_GREY_FLOAT:
|
nuclear@0
|
412 return GL_LUMINANCE16F;
|
nuclear@0
|
413 case Image::FMT_RGB:
|
nuclear@0
|
414 return GL_RGB;
|
nuclear@0
|
415 case Image::FMT_RGB_FLOAT:
|
nuclear@0
|
416 return GL_RGB16F;
|
nuclear@0
|
417 case Image::FMT_RGBA:
|
nuclear@0
|
418 return GL_RGBA;
|
nuclear@0
|
419 case Image::FMT_RGBA_FLOAT:
|
nuclear@0
|
420 return GL_RGBA16F;
|
nuclear@0
|
421 default:
|
nuclear@0
|
422 break;
|
nuclear@0
|
423 }
|
nuclear@0
|
424 return 0;
|
nuclear@0
|
425 }
|
nuclear@0
|
426
|
nuclear@0
|
427 // ---- TextureSet ----
|
nuclear@0
|
428 static void destroy_texture(Texture *tex)
|
nuclear@0
|
429 {
|
nuclear@0
|
430 delete tex;
|
nuclear@0
|
431 }
|
nuclear@0
|
432
|
nuclear@0
|
433 TextureSet::TextureSet()
|
nuclear@0
|
434 : DataSet<Texture*>(load_texture, destroy_texture)
|
nuclear@0
|
435 {
|
nuclear@0
|
436 }
|