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1 #include <string.h>
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2 #include <math.h>
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3 #include "opengl.h"
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4 #include "image.h"
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5
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6 static unsigned int next_pow2(unsigned int x);
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7
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8 Image::Image()
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9 {
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10 width = height = 0;
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11 tex_width = tex_height = 0;
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12 pixels = 0;
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13 texture = 0;
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14 own_pixels = 0;
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15 }
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16
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17 Image::~Image()
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18 {
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19 destroy();
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20 }
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21
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22 void Image::create(int xsz, int ysz, unsigned char *pix)
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23 {
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24 destroy();
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25
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26 pixels = own_pixels = new unsigned char[xsz * ysz * 3];
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27 if(pix) {
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28 memcpy(pixels, pix, xsz * ysz * 3);
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29 } else {
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30 memset(pixels, 0, xsz * ysz * 3);
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31 }
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32 width = xsz;
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33 height = ysz;
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34 }
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35
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36 void Image::destroy()
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37 {
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38 if(texture) {
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39 glDeleteTextures(1, &texture);
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40 texture = 0;
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41 }
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42
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43 delete [] own_pixels;
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44 own_pixels = pixels = 0;
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45
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46 width = height = tex_width = tex_height = 0;
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47 }
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48
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49 unsigned int Image::gen_texture()
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50 {
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51 if(!pixels || !width || !height) {
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52 return 0;
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53 }
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54
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55 if(!texture) {
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56 glGenTextures(1, &texture);
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57 glBindTexture(GL_TEXTURE_2D, texture);
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58 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
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59 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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60 glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
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61 } else {
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62 glBindTexture(GL_TEXTURE_2D, texture);
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63 }
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64
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65 tex_width = next_pow2(width);
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66 tex_height = next_pow2(height);
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67
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68 if(tex_width == width && tex_height == height) {
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69 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, tex_width, tex_height, 0,
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70 GL_RGB, GL_UNSIGNED_BYTE, pixels);
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71 } else {
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72 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, tex_width, tex_height, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
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73 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height,
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74 GL_RGB, GL_UNSIGNED_BYTE, pixels);
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75 }
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76
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77 return texture;
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78 }
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79
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80 static unsigned int next_pow2(unsigned int x)
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81 {
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82 --x;
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83 x |= x >> 1;
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84 x |= x >> 2;
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85 x |= x >> 4;
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86 x |= x >> 8;
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87 x |= x >> 16;
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88 return x + 1;
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89 }
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