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annotate test/testdyngles.c @ 3133:84119fe89d26 gsoc2009_IME
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author | Jiang Jiang <gzjjgod@gmail.com> |
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date | Wed, 01 Jul 2009 16:12:00 +0000 |
parents | 82e60908fab1 |
children | 7f684f249ec9 |
rev | line source |
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1 /* |
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2 * Small SDL example to demonstrate dynamically loading |
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3 * OpenGL lib and functions |
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4 * |
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5 * (FYI it was supposed to look like snow in the wind or something...) |
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6 * |
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7 * Compile with : |
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8 * gcc testdyngl.c `sdl-config --libs --cflags` -o testdyngl -DHAVE_OPENGL |
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9 * |
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10 * You can specify a different OpenGL lib on the command line, i.e. : |
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11 * ./testdyngl /usr/X11R6/lib/libGL.so.1.2 |
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12 * or |
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13 * ./testdyngl /usr/lib/libGL.so.1.0.4496 |
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14 * |
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15 */ |
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16 |
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17 #include <stdio.h> |
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18 #include <stdlib.h> |
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19 |
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20 #include "SDL.h" |
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21 |
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22 #ifdef __IPHONEOS__ |
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23 #define HAVE_OPENGLES |
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24 #endif |
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25 |
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26 #ifdef HAVE_OPENGLES |
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27 |
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28 #include "SDL_opengles.h" |
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29 |
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30 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */ |
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31 static void |
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32 quit(int rc) |
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33 { |
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34 SDL_Quit(); |
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35 exit(rc); |
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36 } |
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37 |
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38 void * |
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39 get_funcaddr(const char *p) |
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40 { |
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41 void *f = SDL_GL_GetProcAddress(p); |
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42 if (f) { |
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43 return f; |
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44 } else { |
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45 printf("Unable to get function pointer for %s\n", p); |
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46 quit(1); |
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47 } |
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48 return NULL; |
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49 } |
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50 |
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51 typedef struct |
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52 { |
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53 //void (APIENTRY * glBegin) (GLenum); |
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54 //void (APIENTRY * glEnd) (); |
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55 //void (APIENTRY * glVertex3f) (GLfloat, GLfloat, GLfloat); |
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56 |
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57 void (APIENTRY * glEnableClientState) (GLenum array); |
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58 void (APIENTRY * glVertexPointer) (GLint size, GLenum type, |
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59 GLsizei stride, |
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60 const GLvoid * pointer); |
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61 void (APIENTRY * glDrawArrays) (GLenum mode, GLint first, GLsizei count); |
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62 |
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63 |
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64 void (APIENTRY * glClearColor) (GLfloat, GLfloat, GLfloat, GLfloat); |
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65 void (APIENTRY * glClear) (GLbitfield); |
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66 void (APIENTRY * glDisable) (GLenum); |
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67 void (APIENTRY * glEnable) (GLenum); |
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68 void (APIENTRY * glColor4f) (GLfloat, GLfloat, GLfloat, GLfloat); |
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69 void (APIENTRY * glPointSize) (GLfloat); |
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70 void (APIENTRY * glHint) (GLenum, GLenum); |
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71 void (APIENTRY * glBlendFunc) (GLenum, GLenum); |
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72 void (APIENTRY * glMatrixMode) (GLenum); |
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73 void (APIENTRY * glLoadIdentity) (); |
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74 void (APIENTRY * glOrthof) (GLfloat, GLfloat, GLfloat, GLfloat, |
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75 GLfloat, GLfloat); |
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76 void (APIENTRY * glRotatef) (GLfloat, GLfloat, GLfloat, GLfloat); |
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77 void (APIENTRY * glViewport) (GLint, GLint, GLsizei, GLsizei); |
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78 void (APIENTRY * glFogf) (GLenum, GLfloat); |
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79 } |
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80 glfuncs; |
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81 |
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82 void |
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83 init_glfuncs(glfuncs * f) |
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84 { |
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85 f->glEnableClientState = get_funcaddr("glEnableClientState"); |
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86 f->glVertexPointer = get_funcaddr("glVertexPointer"); |
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87 f->glDrawArrays = get_funcaddr("glDrawArrays"); |
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88 f->glClearColor = get_funcaddr("glClearColor"); |
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89 f->glClear = get_funcaddr("glClear"); |
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90 f->glDisable = get_funcaddr("glDisable"); |
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91 f->glEnable = get_funcaddr("glEnable"); |
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92 f->glColor4f = get_funcaddr("glColor4f"); |
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93 f->glPointSize = get_funcaddr("glPointSize"); |
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94 f->glHint = get_funcaddr("glHint"); |
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95 f->glBlendFunc = get_funcaddr("glBlendFunc"); |
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96 f->glMatrixMode = get_funcaddr("glMatrixMode"); |
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97 f->glLoadIdentity = get_funcaddr("glLoadIdentity"); |
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98 f->glOrthof = get_funcaddr("glOrthof"); |
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99 f->glRotatef = get_funcaddr("glRotatef"); |
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100 f->glViewport = get_funcaddr("glViewport"); |
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101 f->glFogf = get_funcaddr("glFogf"); |
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102 } |
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103 |
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104 #define NB_PIXELS 1000 |
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105 |
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106 int |
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107 main(int argc, char *argv[]) |
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108 { |
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109 glfuncs f; |
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110 int i; |
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111 SDL_Event event; |
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112 int done = 0; |
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113 GLfloat pixels[NB_PIXELS * 3]; |
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114 const char *gl_library = NULL; /* Use the default GL library */ |
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115 |
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116 int video_w, video_h; |
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117 |
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118 /* you may want to change these according to the platform */ |
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119 video_w = 320; |
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120 video_h = 480; |
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121 #ifdef __QNXNTO__ |
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122 video_h = 640; |
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123 video_w = 480; |
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124 #endif /* __QNXNTO__ */ |
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125 |
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126 if (argv[1]) { |
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127 gl_library = argv[1]; |
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128 } |
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129 |
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130 if (SDL_Init(SDL_INIT_VIDEO) < 0) { |
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131 printf("Unable to init SDL : %s\n", SDL_GetError()); |
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132 return (1); |
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133 } |
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134 |
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135 if (SDL_GL_LoadLibrary(gl_library) < 0) { |
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136 printf("Unable to dynamically open GL ES lib : %s\n", SDL_GetError()); |
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137 quit(1); |
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138 } |
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139 |
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140 if (SDL_SetVideoMode(video_h, video_w, 0, SDL_OPENGL) == NULL) { |
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141 printf("Unable to open video mode : %s\n", SDL_GetError()); |
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142 quit(1); |
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143 } |
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144 |
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145 /* Set the window manager title bar */ |
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146 SDL_WM_SetCaption("SDL Dynamic OpenGL ES Loading Test", "testdyngles"); |
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147 |
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148 init_glfuncs(&f); |
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149 |
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150 for (i = 0; i < NB_PIXELS; i++) { |
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151 pixels[3 * i] = rand() % 250 - 125; |
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152 pixels[3 * i + 1] = rand() % 250 - 125; |
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153 pixels[3 * i + 2] = rand() % 250 - 125; |
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154 } |
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155 |
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156 #ifdef __QNXNTO__ |
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157 f.glViewport(0, 0, video_h, video_w); |
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158 #else |
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159 f.glViewport(0, 0, video_w, video_h); |
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160 #endif /* __QNXNTO__ */ |
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161 |
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162 f.glMatrixMode(GL_PROJECTION); |
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163 f.glLoadIdentity(); |
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164 f.glOrthof(-100, 100, -100, 100, -500, 500); |
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165 |
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166 f.glMatrixMode(GL_MODELVIEW); |
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167 f.glLoadIdentity(); |
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168 |
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169 f.glEnable(GL_DEPTH_TEST); |
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170 f.glDisable(GL_TEXTURE_2D); |
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171 f.glEnable(GL_BLEND); |
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172 f.glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); |
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173 |
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174 f.glClearColor(0.0f, 0.0f, 0.0f, 0.0f); |
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175 f.glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
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176 |
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177 f.glEnable(GL_POINT_SMOOTH); |
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178 f.glHint(GL_POINT_SMOOTH_HINT, GL_NICEST); |
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179 f.glPointSize(5.0f); |
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180 f.glEnable(GL_FOG); |
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181 f.glFogf(GL_FOG_START, -500); |
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182 f.glFogf(GL_FOG_END, 500); |
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183 f.glFogf(GL_FOG_DENSITY, 0.005); |
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184 |
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185 do { |
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186 f.glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
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187 |
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188 f.glRotatef(2.0, 1.0, 1.0, 1.0); |
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189 f.glRotatef(1.0, 0.0, 1.0, 1.0); |
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190 |
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191 f.glColor4f(1.0, 1.0, 1.0, 1.0); |
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192 |
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193 f.glEnableClientState(GL_VERTEX_ARRAY); |
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194 f.glVertexPointer(3, GL_FLOAT, 0, pixels); |
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195 f.glDrawArrays(GL_POINTS, 0, NB_PIXELS); |
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196 |
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197 SDL_GL_SwapBuffers(); |
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198 |
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199 while (SDL_PollEvent(&event)) { |
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200 if (event.type == SDL_QUIT) |
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201 done = 1; |
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202 if (event.type == SDL_KEYDOWN) |
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203 done = 1; |
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204 } |
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205 |
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206 SDL_Delay(20); |
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207 } |
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208 while (!done); |
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209 |
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210 SDL_Quit(); |
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211 return 0; |
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212 } |
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213 |
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214 #else /* HAVE_OPENGLES */ |
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215 |
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216 int |
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217 main(int argc, char *argv[]) |
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218 { |
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219 printf("No OpenGL ES support on this system\n"); |
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220 return 1; |
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221 } |
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222 |
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223 #endif /* HAVE_OPENGLES */ |