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1 #include <string.h>
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2 #include <errno.h>
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3 #include <assert.h>
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4
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5 #ifndef __APPLE__
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6 #ifdef WIN32
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7 #include <windows.h>
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8 #endif
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9
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10 #include <GL/gl.h>
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11 #else
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12 #include <OpenGL/gl.h>
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13 #endif
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14
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15 #include <imago2.h>
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16 #include "psys.h"
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17 #include "psys_gl.h"
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18
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19 void psys_gl_draw_start(struct psys_emitter *em, void *cls)
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20 {
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21 glPushAttrib(GL_ENABLE_BIT);
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22 glDisable(GL_LIGHTING);
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23
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24 glEnable(GL_BLEND);
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25 glBlendFunc(GL_SRC_ALPHA, GL_ONE);
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26
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27 if(em->attr.tex) {
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28 glEnable(GL_TEXTURE_2D);
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29 glBindTexture(GL_TEXTURE_2D, em->attr.tex);
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30 }
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31
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32 glDepthMask(0);
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33 }
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34
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35 void psys_gl_draw(struct psys_emitter *em, struct psys_particle *p, void *cls)
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36 {
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37 float hsz = p->size / 2.0;
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38
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39 float xform[16];
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40
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41 glMatrixMode(GL_MODELVIEW);
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42 glPushMatrix();
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43
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44 glTranslatef(p->pos.x, p->pos.y, p->pos.z);
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45
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46 glGetFloatv(GL_MODELVIEW_MATRIX, xform);
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47 xform[0] = xform[5] = xform[10] = 1.0;
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48 xform[1] = xform[2] = xform[4] = xform[6] = xform[8] = xform[9] = 0.0;
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49 glLoadMatrixf(xform);
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50
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51 glBegin(GL_QUADS);
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52 glColor4f(p->color.x, p->color.y, p->color.z, p->alpha);
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53
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54 glTexCoord2f(0, 0);
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55 glVertex2f(-hsz, -hsz);
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56
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57 glTexCoord2f(1, 0);
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58 glVertex2f(hsz, -hsz);
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59
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60 glTexCoord2f(1, 1);
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61 glVertex2f(hsz, hsz);
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62
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63 glTexCoord2f(0, 1);
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64 glVertex2f(-hsz, hsz);
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65 glEnd();
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66
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67 glMatrixMode(GL_MODELVIEW);
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68 glPopMatrix();
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69 }
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70
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71 void psys_gl_draw_end(struct psys_emitter *em, void *cls)
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72 {
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73 glDepthMask(1);
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74 glPopAttrib();
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75 }
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76
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77
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78 unsigned int psys_gl_load_texture(const char *fname, void *cls)
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79 {
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80 unsigned int tex;
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81 void *pixels;
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82 int xsz, ysz;
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83
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84 if(!(pixels = img_load_pixels(fname, &xsz, &ysz, IMG_FMT_RGBA32))) {
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85 return 0;
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86 }
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87 printf("%s: creating texture %s (%dx%d)\n", __func__, fname, xsz, ysz);
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88
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89 glGenTextures(1, &tex);
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90 glBindTexture(GL_TEXTURE_2D, tex);
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91 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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92 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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93 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
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94 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
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95 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, xsz, ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
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96
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97 assert(glGetError() == GL_NO_ERROR);
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98
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99 img_free_pixels(pixels);
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100 return tex;
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101 }
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102
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103 void psys_gl_unload_texture(unsigned int tex, void *cls)
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104 {
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105 glDeleteTextures(1, &tex);
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106 }
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