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1 #include <math.h>
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2 #include <assert.h>
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3 #include <GL/glut.h>
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4 #include <GL/freeglut_ext.h>
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5 #include <imago2.h>
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6 #include <drawtext.h>
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7 #include <dsys.h>
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8
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9 static void disp(void);
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10 static void draw_text(void);
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11 static void reshape(int x, int y);
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12
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13 static struct img_pixmap *curfrm;
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14 static int nfrm;
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15 static int xsz = -1, ysz;
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16 static float tsec;
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17
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18 static struct dsys_demo *script;
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19
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20 static struct dtx_font *font;
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21
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22 static struct {
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23 const char *name, *caption;
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24 struct dsys_event *ev;
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25 } events[] = {
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26 {"diffuse", "diffuse only - 1 light", 0},
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27 {"diffuse2", "diffuse only - 2 lights", 0},
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28 {"vmanip", "vertex manipulation", 0},
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29 {"2tone", "two-tone paint", 0},
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30 {"specular2", "full phong - 2 lights", 0},
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31 {"celshade", "cel shading", 0},
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32 {"sphmap", "reflection - spherical env. map", 0},
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33 {"cubemap", "reflection - cubic env. map", 0},
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34 {"refract", "relfection & refraction - cubic env. map w/fresnel", 0},
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35 {"distort1", "image distortion", 0},
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36 {"blur", "blur", 0},
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37 {"distort2", "image distortion (again)", 0},
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38 {0, 0, 0}
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39 };
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40
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41
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42 int init(void)
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43 {
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44 int i, argc = 1;
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45 char *argv[] = {"./vpost", 0};
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46
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47 if(!(font = dtx_open_font("linux-libertine.ttf", 32))) {
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48 fprintf(stderr, "failed to open font\n");
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49 return -1;
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50 }
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51
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52 if(!(script = dsys_open("script"))) {
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53 fprintf(stderr, "failed to open script\n");
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54 return -1;
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55 }
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56
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57 for(i=0; events[i].name; i++) {
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58 events[i].ev = dsys_event(script, events[i].name);
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59 }
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60
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61 glutInit(&argc, argv);
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62 glutInitWindowSize(32, 32);
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63 glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
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64
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65 glutCreateWindow("foo");
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66
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67 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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68
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69 glutDisplayFunc(disp);
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70 glutReshapeFunc(reshape);
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71 return 0;
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72 }
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73
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74 void shutdown(void)
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75 {
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76 printf("shutdown called\n");
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77 }
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78
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79 int process(struct img_pixmap *frame, int frm_num, float sec)
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80 {
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81 curfrm = frame;
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82 nfrm = frm_num;
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83 tsec = sec;
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84
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85 if(frame->width != xsz || frame->height != ysz) {
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86 glutReshapeWindow(frame->width, frame->height);
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87 }
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88 glutPostRedisplay();
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89
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90 while(curfrm) {
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91 glutMainLoopEvent();
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92 }
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93 return 0;
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94 }
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95
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96 static void disp(void)
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97 {
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98 assert(curfrm);
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99 glClear(GL_COLOR_BUFFER_BIT);
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100
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101 dsys_update(script, dsys_msec_to_dtime(nfrm));
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102
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103 glDrawPixels(xsz, ysz, GL_RGB, GL_UNSIGNED_BYTE, curfrm->pixels);
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104
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105 draw_text();
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106
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107 glFlush();
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108 glReadPixels(0, 0, xsz, ysz, GL_RGB, GL_UNSIGNED_BYTE, curfrm->pixels);
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109
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110 glutSwapBuffers();
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111 curfrm = 0;
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112
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113 assert(glGetError() == GL_NO_ERROR);
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114 }
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115
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116 static float fade(float x)
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117 {
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118 x = 1.0 - (cos((x) * M_PI * 2.0) * 0.5 + 0.5);
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119 x *= 10.0f;
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120
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121 return x > 1.0 ? 1.0 : x;
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122 }
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123
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124 static void caption(const char *text, struct dsys_event *ev)
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125 {
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126 float t = fade(dsys_event_value(ev));
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127
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128 if(t < (1.0f / 255.0f)) {
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129 return;
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130 }
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131
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132 glMatrixMode(GL_MODELVIEW);
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133 glPushMatrix();
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134 glTranslatef(0, 40 * t - 20, 0);
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135
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136 glBegin(GL_QUADS);
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137 glColor4f(0.7, 0.2, 0.1, t);
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138 glVertex2f(0, -10);
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139 glVertex2f(xsz, -10);
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140 glVertex2f(xsz, 30);
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141 glVertex2f(0, 30);
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142 glEnd();
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143
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144 glTranslatef(20, 0, 0);
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145
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146 glColor4f(1, 1, 1, t);
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147 dtx_string(text);
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148
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149 glPopMatrix();
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150 }
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151
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152
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153 static void draw_text(void)
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154 {
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155 int i;
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156 dtx_use_font(font, 32);
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157
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158 glPushAttrib(GL_ENABLE_BIT);
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159 glEnable(GL_BLEND);
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160
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161 for(i=0; events[i].name; i++) {
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162 caption(events[i].caption, events[i].ev);
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163 }
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164
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165 glPopAttrib();
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166 }
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167
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168 static void reshape(int x, int y)
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169 {
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170 xsz = x;
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171 ysz = y;
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172
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173 glViewport(0, 0, x, y);
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174 glMatrixMode(GL_PROJECTION);
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175 glLoadIdentity();
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176 glOrtho(0, x, y, 0, -1, 1);
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177 }
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