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1 #include <stdio.h>
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2 #include <imago2.h>
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3 #include "texture.h"
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4 #include "opengl.h"
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5
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6 Texture::Texture()
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7 {
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8 width = height = tex_width = tex_height = 0;
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9 tex = 0;
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10 }
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11
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12 Texture::~Texture()
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13 {
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14 if(tex) {
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15 glDeleteTextures(1, &tex);
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16 }
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17 }
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18
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19 static unsigned int next_pow2(unsigned int x)
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20 {
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21 --x;
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22 x |= x >> 1;
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23 x |= x >> 2;
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24 x |= x >> 4;
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25 x |= x >> 8;
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26 x |= x >> 16;
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27 return x + 1;
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28 }
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29
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30 bool Texture::load(const char *fname)
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31 {
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32 img_pixmap img;
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33 img_init(&img);
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34 if(img_load(&img, fname) == -1) {
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35 fprintf(stderr, "failed to load texture: %s\n", fname);
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36 img_destroy(&img);
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37 return false;
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38 }
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39
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40 unsigned int intfmt = img_glintfmt(&img);
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41 unsigned int pixfmt = img_glfmt(&img);
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42 unsigned int pixtype = img_gltype(&img);
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43
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44 // if we have the sRGB extension, change the internal formats to sRGB
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45 if(GLEW_EXT_texture_sRGB) {
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46 switch(intfmt) {
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47 case 3:
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48 case GL_RGB:
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49 intfmt = GL_SRGB_EXT;
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50 break;
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51 case 4:
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52 case GL_RGBA:
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53 intfmt = GL_SRGB_ALPHA;
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54 break;
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55 case 1:
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56 case GL_LUMINANCE:
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57 intfmt = GL_SLUMINANCE;
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58 break;
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59 default:
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60 break;
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61 }
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62 }
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63
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64 width = img.width;
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65 height = img.height;
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66 tex_width = next_pow2(width);
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67 tex_height = next_pow2(height);
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68
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69 if(!tex) {
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70 glGenTextures(1, &tex);
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71 }
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72 glBindTexture(GL_TEXTURE_2D, tex);
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73
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74 if(GLEW_SGIS_generate_mipmap) {
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75 glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
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76 } else {
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77 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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78 }
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79
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80 glTexImage2D(GL_TEXTURE_2D, 0, intfmt, tex_width, tex_height, 0, pixfmt, pixtype, 0);
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81 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, pixfmt, pixtype, img.pixels);
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82
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83 tmat.scaling((float)width / (float)tex_width, (float)height / (float)tex_height, 1);
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84 return true;
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85 }
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86
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87 const Mat4 &Texture::texture_matrix() const
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88 {
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89 return tmat;
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90 }
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91
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92 void Texture::bind(bool loadmat) const
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93 {
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94 if(!tex) return;
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95
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96 if(loadmat) {
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97 glMatrixMode(GL_TEXTURE);
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98 glLoadMatrixf(tmat[0]);
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99 glMatrixMode(GL_MODELVIEW);
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100 }
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101
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102 glBindTexture(GL_TEXTURE_2D, tex);
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103 }
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