1 | /* |
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2 | orxonox - the future of 3D-vertical-scrollers |
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3 | |
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4 | Copyright (C) 2004 orx |
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5 | |
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6 | This program is free software; you can redistribute it and/or modify |
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7 | it under the terms of the GNU General Public License as published by |
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8 | the Free Software Foundation; either version 2, or (at your option) |
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9 | any later version. |
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10 | |
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11 | ### File Specific: |
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12 | main-programmer: Benjamin Grauer |
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13 | co-programmer: ... |
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14 | */ |
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15 | |
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16 | #define DEBUG_SPECIAL_MODULE DEBUG_MODULE_IMPORTER |
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17 | |
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18 | #include "texture.h" |
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19 | |
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20 | #include "debug.h" |
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21 | |
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22 | // INCLUDING SDL_Image |
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23 | #ifdef HAVE_SDL_IMAGE_H |
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24 | #include <SDL_image.h> |
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25 | #else |
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26 | #include <SDL/SDL_image.h> |
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27 | #endif |
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28 | |
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29 | /** |
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30 | * Constructor for a Texture |
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31 | */ |
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32 | Texture::Texture(const char* imageName) |
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33 | { |
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34 | this->setClassID(CL_TEXTURE, "Texture"); |
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35 | |
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36 | this->bAlpha = false; |
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37 | this->texture = 0; |
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38 | this->image = NULL; |
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39 | |
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40 | if (imageName != NULL) |
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41 | { |
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42 | this->setName(imageName); |
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43 | this->loadImage(imageName); |
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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 | * Destructor of a Texture |
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49 | |
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50 | Frees Data, and deletes the textures from GL |
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51 | */ |
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52 | Texture::~Texture() |
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53 | { |
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54 | if (this->texture != 0) |
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55 | glDeleteTextures(1, &this->texture); |
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56 | if (this->image != NULL) |
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57 | SDL_FreeSurface(this->image); |
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58 | } |
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59 | |
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60 | /** |
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61 | * loads an Image from a file to a Texture |
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62 | * @param imageName The image to load |
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63 | */ |
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64 | bool Texture::loadImage(const char* imageName) |
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65 | { |
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66 | if (Texture::texturesEnabled) |
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67 | { |
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68 | if (this->image != NULL) |
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69 | { |
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70 | SDL_FreeSurface(this->image); |
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71 | this->image = NULL; |
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72 | } |
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73 | if (this->texture != 0) |
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74 | { |
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75 | glDeleteTextures(1, &this->texture); |
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76 | this->texture = 0; |
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77 | } |
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78 | if (imageName != NULL) |
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79 | { |
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80 | SDL_Surface* tmpSurf; |
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81 | if (this->texture != 0 && glIsTexture(this->texture)) |
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82 | glDeleteTextures(1, &this->texture); |
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83 | // load the new Image to memory |
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84 | tmpSurf = IMG_Load(imageName); |
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85 | if(tmpSurf != NULL) |
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86 | { |
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87 | PRINTF(4)("loading Image %s\n", imageName); |
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88 | bool hasAlpha; |
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89 | SDL_Surface* newSurf = this->prepareSurface(tmpSurf, hasAlpha); |
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90 | if (newSurf != NULL) |
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91 | { |
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92 | this->setSurface(newSurf); |
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93 | this->setAlpha(hasAlpha); |
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94 | this->setTexture(Texture::loadTexToGL(newSurf)); |
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95 | } |
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96 | |
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97 | SDL_FreeSurface(tmpSurf); |
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98 | return true; |
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99 | } |
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100 | else |
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101 | { |
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102 | PRINTF(1)("IMG_Load: %s\n", IMG_GetError()); |
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103 | this->texture = 0; |
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104 | return false; |
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105 | } |
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106 | } |
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107 | else |
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108 | { |
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109 | PRINTF(2)("Image-Name not specified\n"); |
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110 | return false; |
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111 | } |
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112 | } |
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113 | return false; |
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114 | } |
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115 | |
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116 | bool Texture::rebuild() |
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117 | { |
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118 | if (this->texture != 0) |
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119 | { |
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120 | if (glIsTexture(this->texture)) |
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121 | glDeleteTextures(1,&this->texture); |
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122 | this->setTexture(0); |
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123 | } |
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124 | |
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125 | if (this->image != NULL) |
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126 | { |
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127 | PRINTF(3)("Reloading Texture of %s '%s'\n", this->getClassName(), this->getName()); |
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128 | this->setTexture(loadTexToGL(this->image)); |
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129 | } |
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130 | |
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131 | } |
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132 | |
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133 | /** |
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134 | * converts surface to a new SDL_Surface, that is loadable by openGL |
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135 | * @param surface the Surface to convert |
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136 | * @param hasAlpha if the newly created Surface has an alpha channel, true is returned otherwise false. |
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137 | * @returns a !!new!! Surface, that is loadable by openGL. |
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138 | */ |
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139 | SDL_Surface* Texture::prepareSurface(SDL_Surface* surface, bool& hasAlpha) |
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140 | { |
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141 | PRINTF(4)("Loading texture to OpenGL-Environment.\n"); |
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142 | |
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143 | SDL_Surface* retSurface; |
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144 | SDL_Rect area; |
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145 | Uint32 saved_flags; |
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146 | Uint8 saved_alpha; |
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147 | |
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148 | hasAlpha = false; |
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149 | retSurface = SDL_CreateRGBSurface(SDL_SWSURFACE, |
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150 | surface->w, surface->h, |
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151 | 32, |
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152 | #if SDL_BYTEORDER == SDL_LIL_ENDIAN /* OpenGL RGBA masks */ |
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153 | 0x000000FF, |
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154 | 0x0000FF00, |
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155 | 0x00FF0000, |
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156 | 0xFF000000 |
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157 | #else |
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158 | 0xFF000000, |
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159 | 0x00FF0000, |
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160 | 0x0000FF00, |
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161 | 0x000000FF |
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162 | #endif |
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163 | ); |
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164 | if ( retSurface == NULL ) |
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165 | { |
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166 | return NULL; |
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167 | } |
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168 | |
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169 | /* Save the alpha blending attributes */ |
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170 | saved_flags = surface->flags&(SDL_SRCALPHA|SDL_RLEACCELOK); |
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171 | saved_alpha = surface->format->alpha; |
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172 | if ( (saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) { |
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173 | SDL_SetAlpha(surface, 0, 0); |
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174 | } |
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175 | |
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176 | /* Copy the surface into the GL texture image */ |
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177 | area.x = 0; |
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178 | area.y = 0; |
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179 | area.w = surface->w; |
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180 | area.h = surface->h; |
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181 | SDL_BlitSurface(surface, &area, retSurface, &area); |
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182 | |
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183 | /* Restore the alpha blending attributes */ |
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184 | if ( (saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) |
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185 | { |
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186 | SDL_SetAlpha(surface, saved_flags | SDL_OPENGL, saved_alpha); |
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187 | hasAlpha = true; |
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188 | } |
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189 | |
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190 | return (retSurface); |
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191 | } |
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192 | |
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193 | /** |
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194 | * set the surface this Texture handles |
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195 | * @param newSurface the new Surface to set as the image for this Texture. |
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196 | * |
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197 | * This deletes the old version of the stored Texture, |
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198 | * and sets the newly given Surface as current. |
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199 | */ |
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200 | bool Texture::setSurface(SDL_Surface* newSurface) |
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201 | { |
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202 | if (this->image != NULL) |
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203 | SDL_FreeSurface(this->image); |
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204 | |
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205 | this->image = newSurface; |
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206 | |
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207 | return (this->image != NULL); |
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208 | } |
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209 | |
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210 | |
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211 | bool Texture::texturesEnabled = true; |
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212 | |
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213 | /** |
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214 | * enables, disables textures |
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215 | * @param texturesEnabled true if the textures should be enabled |
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216 | */ |
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217 | void Texture::setTextureEnableState(bool texturesEnabled) |
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218 | { |
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219 | Texture::texturesEnabled = texturesEnabled; |
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220 | } |
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221 | |
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222 | |
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223 | ////////////////////////////////////// |
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224 | // UTILITY FUNCTIONALITY OF TEXTURE // |
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225 | ////////////////////////////////////// |
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226 | /** |
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227 | * Loads a Texture to the openGL-environment. |
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228 | * @param surface the Image to load to openGL |
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229 | * @returns The ID of the texture. |
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230 | */ |
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231 | GLuint Texture::loadTexToGL (const SDL_Surface* surface) |
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232 | { |
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233 | // if (this->texture != 0 && glIsTexture(this->texture)) |
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234 | // glDeleteTextures(1, &this->texture); |
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235 | // this->texture = 0; |
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236 | |
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237 | GLuint texture; |
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238 | |
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239 | if (surface == NULL) |
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240 | return 0; |
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241 | |
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242 | /* Create an OpenGL texture for the image */ |
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243 | glGenTextures(1, &texture); |
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244 | glBindTexture(GL_TEXTURE_2D, texture); |
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245 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
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246 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
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247 | // build the Texture |
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248 | glTexImage2D(GL_TEXTURE_2D, |
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249 | 0, |
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250 | GL_RGBA, |
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251 | surface->w, surface->h, |
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252 | 0, |
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253 | GL_RGBA, |
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254 | GL_UNSIGNED_BYTE, |
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255 | surface->pixels); |
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256 | // build the MipMaps |
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257 | gluBuild2DMipmaps(GL_TEXTURE_2D, |
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258 | GL_RGBA, |
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259 | surface->w, |
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260 | surface->h, |
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261 | GL_RGBA, |
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262 | GL_UNSIGNED_BYTE, |
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263 | surface->pixels); |
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264 | glBindTexture(GL_TEXTURE_2D, 0); |
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265 | return texture; |
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266 | } |
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