[3341] | 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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[3590] | 16 | #define DEBUG_SPECIAL_MODULE DEBUG_MODULE_IMPORTER |
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| 17 | |
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[3341] | 18 | #include "texture.h" |
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| 19 | |
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[3622] | 20 | #include "graphics_engine.h" |
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| 21 | |
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[3341] | 22 | /** |
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[3344] | 23 | \brief Constructor for a Texture |
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| 24 | */ |
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[3655] | 25 | Texture::Texture(const char* imageName) |
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| 26 | { |
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[3966] | 27 | bAlpha = false; |
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[3655] | 28 | this->texture = 0; |
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[3905] | 29 | if (imageName) |
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| 30 | this->loadImage(imageName); |
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[3655] | 31 | } |
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| 32 | |
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| 33 | /** |
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[3344] | 34 | \brief Destructor of a Texture |
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| 35 | |
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| 36 | Frees Data, and deletes the textures from GL |
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| 37 | */ |
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| 38 | Texture::~Texture(void) |
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| 39 | { |
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| 40 | if (this->texture) |
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| 41 | glDeleteTextures(1, &this->texture); |
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| 42 | } |
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| 43 | |
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| 44 | /** |
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| 45 | \brief a Simple function that switches two char values |
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| 46 | \param a The first value |
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| 47 | \param b The second value |
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| 48 | */ |
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[3863] | 49 | void Texture::swap (unsigned char &a, unsigned char &b) |
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[3343] | 50 | { |
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| 51 | unsigned char temp; |
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| 52 | temp = a; |
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| 53 | a = b; |
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| 54 | b = temp; |
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| 55 | } |
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| 56 | |
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| 57 | |
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[3341] | 58 | /** |
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| 59 | \brief Loads a Texture to the openGL-environment. |
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[3905] | 60 | \param surface the Image to load to openGL |
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| 61 | \returns The ID of the texture. |
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[3341] | 62 | */ |
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[3905] | 63 | GLuint Texture::loadTexToGL (SDL_Surface* surface) |
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[3341] | 64 | { |
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[3622] | 65 | if (GraphicsEngine::texturesEnabled) |
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| 66 | { |
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| 67 | PRINTF(4)("Loading texture to OpenGL-Environment.\n"); |
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[3905] | 68 | |
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| 69 | GLuint texture; |
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| 70 | int w, h; |
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| 71 | SDL_Surface *image; |
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| 72 | SDL_Rect area; |
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| 73 | Uint32 saved_flags; |
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| 74 | Uint8 saved_alpha; |
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[3622] | 75 | |
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[3905] | 76 | w = surface->w; |
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| 77 | h = surface->h; |
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| 78 | |
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| 79 | image = SDL_CreateRGBSurface(SDL_SWSURFACE, |
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| 80 | w, h, |
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| 81 | 32, |
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| 82 | #if SDL_BYTEORDER == SDL_LIL_ENDIAN /* OpenGL RGBA masks */ |
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| 83 | 0x000000FF, |
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| 84 | 0x0000FF00, |
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| 85 | 0x00FF0000, |
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| 86 | 0xFF000000 |
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| 87 | #else |
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| 88 | 0xFF000000, |
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| 89 | 0x00FF0000, |
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| 90 | 0x0000FF00, |
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| 91 | 0x000000FF |
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| 92 | #endif |
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| 93 | ); |
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| 94 | if ( image == NULL ) { |
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| 95 | return 0; |
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| 96 | } |
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| 97 | |
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| 98 | /* Save the alpha blending attributes */ |
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| 99 | saved_flags = surface->flags&(SDL_SRCALPHA|SDL_RLEACCELOK); |
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| 100 | saved_alpha = surface->format->alpha; |
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| 101 | if ( (saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) { |
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| 102 | SDL_SetAlpha(surface, 0, 0); |
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| 103 | } |
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| 104 | |
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| 105 | /* Copy the surface into the GL texture image */ |
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| 106 | area.x = 0; |
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| 107 | area.y = 0; |
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| 108 | area.w = surface->w; |
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| 109 | area.h = surface->h; |
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| 110 | SDL_BlitSurface(surface, &area, image, &area); |
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| 111 | |
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| 112 | /* Restore the alpha blending attributes */ |
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| 113 | if ( (saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) { |
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| 114 | SDL_SetAlpha(surface, saved_flags | SDL_OPENGL, saved_alpha); |
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[3966] | 115 | this->bAlpha = true; |
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[3905] | 116 | } |
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| 117 | |
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| 118 | /* Create an OpenGL texture for the image */ |
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| 119 | glGenTextures(1, &texture); |
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| 120 | glBindTexture(GL_TEXTURE_2D, texture); |
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| 121 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
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| 122 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
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[3966] | 123 | // build the Texture |
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| 124 | glTexImage2D(GL_TEXTURE_2D, |
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[3905] | 125 | 0, |
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| 126 | GL_RGBA, |
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| 127 | w, h, |
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| 128 | 0, |
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| 129 | GL_RGBA, |
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| 130 | GL_UNSIGNED_BYTE, |
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| 131 | image->pixels); |
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[3966] | 132 | // build the MipMaps |
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[3905] | 133 | gluBuild2DMipmaps(GL_TEXTURE_2D, |
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[3966] | 134 | GL_RGBA, |
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[3905] | 135 | w, |
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| 136 | h, |
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| 137 | GL_RGBA, |
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| 138 | GL_UNSIGNED_BYTE, |
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| 139 | image->pixels); |
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[3966] | 140 | |
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[3905] | 141 | SDL_FreeSurface(image); /* No longer needed */ |
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| 142 | |
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| 143 | return texture; |
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[3622] | 144 | } |
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[3341] | 145 | } |
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| 146 | |
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[3863] | 147 | /** |
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| 148 | \brief loads an Image from a file to a Texture |
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| 149 | \param imageName The image to load |
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| 150 | */ |
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[3655] | 151 | bool Texture::loadImage(const char* imageName) |
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[3341] | 152 | { |
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[3622] | 153 | if (GraphicsEngine::texturesEnabled) |
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[3341] | 154 | { |
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[3660] | 155 | if (imageName) |
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[3341] | 156 | { |
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[3905] | 157 | SDL_Surface* tmpSurf; |
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| 158 | if (this->texture) |
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| 159 | glDeleteTextures(1, &this->texture); |
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| 160 | // load the new Image to memory |
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| 161 | tmpSurf = IMG_Load(imageName); |
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| 162 | if(!tmpSurf) |
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[3622] | 163 | { |
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| 164 | PRINTF(1)("IMG_Load: %s\n", IMG_GetError()); |
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| 165 | return false; |
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| 166 | } |
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[3790] | 167 | |
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[3905] | 168 | GLubyte* pixels = (GLubyte*)tmpSurf->pixels; |
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[3622] | 169 | |
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[3905] | 170 | /* this swaps the Mapping so lowel left will be upper left */ |
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| 171 | for( int i = 0 ; i < (tmpSurf->h / 2) ; ++i ) |
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| 172 | for( int j = 0 ; j < tmpSurf->w * tmpSurf->format->BytesPerPixel; j += tmpSurf->format->BytesPerPixel ) |
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| 173 | for(int k = 0; k < tmpSurf->format->BytesPerPixel; ++k) |
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| 174 | swap( pixels[(i * tmpSurf->w * tmpSurf->format->BytesPerPixel) + j + k], |
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| 175 | pixels[ ( (tmpSurf->h - i - 1) * tmpSurf->w * tmpSurf->format->BytesPerPixel) + j + k]); |
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| 176 | |
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| 177 | PRINTF(3)("loading Image %s\n", imageName); |
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| 178 | if (tmpSurf) |
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| 179 | this->texture = loadTexToGL(tmpSurf); |
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| 180 | |
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| 181 | |
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| 182 | SDL_FreeSurface(tmpSurf); |
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| 183 | return true; |
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[3622] | 184 | } |
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| 185 | else |
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| 186 | { |
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[3660] | 187 | PRINTF(2)("Image not Found: %s\n", imageName); |
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[3341] | 188 | return false; |
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| 189 | } |
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| 190 | } |
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| 191 | } |
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