annotate test/testdyngles.c @ 3474:1edb86163d62

Of COURSE that trick wouldn't work on all renderers. Fall back to something for now, hopefully figure out a better way to do this later. If we have to, we can use vertical line and horizontal line textures for vertical and horizontal lines, and then create custom textures for diagonal lines and software render those. It's terrible, but at least it would be pixel perfect.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 21 Nov 2009 07:22:59 +0000
parents f4bc25567731
children 1435f8a6425c
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 * glEnableClientState) (GLenum array);
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54 void (APIENTRY * glDisableClientState) (GLenum array);
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55 void (APIENTRY * glVertexPointer) (GLint size, GLenum type,
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56 GLsizei stride,
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57 const GLvoid * pointer);
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58 void (APIENTRY * glDrawArrays) (GLenum mode, GLint first, GLsizei count);
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59
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60
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61 void (APIENTRY * glClearColor) (GLfloat, GLfloat, GLfloat, GLfloat);
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62 void (APIENTRY * glClear) (GLbitfield);
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63 void (APIENTRY * glDisable) (GLenum);
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64 void (APIENTRY * glEnable) (GLenum);
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65 void (APIENTRY * glColor4f) (GLfloat, GLfloat, GLfloat, GLfloat);
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66 void (APIENTRY * glPointSize) (GLfloat);
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67 void (APIENTRY * glHint) (GLenum, GLenum);
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68 void (APIENTRY * glBlendFunc) (GLenum, GLenum);
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69 void (APIENTRY * glMatrixMode) (GLenum);
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70 void (APIENTRY * glLoadIdentity) ();
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71 void (APIENTRY * glOrthof) (GLfloat, GLfloat, GLfloat, GLfloat,
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72 GLfloat, GLfloat);
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73 void (APIENTRY * glRotatef) (GLfloat, GLfloat, GLfloat, GLfloat);
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74 void (APIENTRY * glViewport) (GLint, GLint, GLsizei, GLsizei);
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75 void (APIENTRY * glFogf) (GLenum, GLfloat);
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76 }
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77 glfuncs;
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78
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79 void
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80 init_glfuncs(glfuncs * f)
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81 {
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82 f->glEnableClientState = get_funcaddr("glEnableClientState");
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83 f->glDisableClientState = get_funcaddr("glDisableClientState");
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84 f->glVertexPointer = get_funcaddr("glVertexPointer");
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85 f->glDrawArrays = get_funcaddr("glDrawArrays");
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86 f->glClearColor = get_funcaddr("glClearColor");
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87 f->glClear = get_funcaddr("glClear");
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88 f->glDisable = get_funcaddr("glDisable");
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89 f->glEnable = get_funcaddr("glEnable");
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90 f->glColor4f = get_funcaddr("glColor4f");
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91 f->glPointSize = get_funcaddr("glPointSize");
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92 f->glHint = get_funcaddr("glHint");
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93 f->glBlendFunc = get_funcaddr("glBlendFunc");
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94 f->glMatrixMode = get_funcaddr("glMatrixMode");
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95 f->glLoadIdentity = get_funcaddr("glLoadIdentity");
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96 f->glOrthof = get_funcaddr("glOrthof");
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97 f->glRotatef = get_funcaddr("glRotatef");
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98 f->glViewport = get_funcaddr("glViewport");
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99 f->glFogf = get_funcaddr("glFogf");
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100 }
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101
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102 #define NB_PIXELS 1000
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103
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104 int
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105 main(int argc, char *argv[])
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106 {
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107 glfuncs f;
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108 int i;
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109 SDL_Event event;
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110 int done = 0;
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111 GLfloat pixels[NB_PIXELS * 3];
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112 const char *gl_library = NULL; /* Use the default GL library */
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113
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114 int video_w, video_h;
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115
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116 /* you may want to change these according to the platform */
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117 video_w = 320;
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118 video_h = 480;
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119 #ifdef __QNXNTO__
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120 video_w = 480;
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121 video_h = 640;
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122 #endif /* __QNXNTO__ */
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123
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124 if (argv[1]) {
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125 gl_library = argv[1];
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126 }
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127
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128 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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129 printf("Unable to init SDL : %s\n", SDL_GetError());
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130 return (1);
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131 }
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132
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133 if (SDL_GL_LoadLibrary(gl_library) < 0) {
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134 printf("Unable to dynamically open GL ES lib : %s\n", SDL_GetError());
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135 quit(1);
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136 }
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137
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138 if (SDL_SetVideoMode(video_h, video_w, 0, SDL_OPENGL) == NULL) {
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139 printf("Unable to open video mode : %s\n", SDL_GetError());
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140 quit(1);
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141 }
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142
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143 /* Set the window manager title bar */
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144 SDL_WM_SetCaption("SDL Dynamic OpenGL ES Loading Test", "testdyngles");
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145
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146 init_glfuncs(&f);
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147
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148 for (i = 0; i < NB_PIXELS; i++) {
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149 pixels[3 * i] = rand() % 250 - 125;
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150 pixels[3 * i + 1] = rand() % 250 - 125;
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151 pixels[3 * i + 2] = rand() % 250 - 125;
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152 }
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153
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154 #ifdef __QNXNTO__
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155 f.glViewport(0, 0, video_h, video_w);
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156 #else
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157 f.glViewport(0, 0, video_w, video_h);
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158 #endif /* __QNXNTO__ */
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159
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160 f.glMatrixMode(GL_PROJECTION);
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161 f.glLoadIdentity();
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162 f.glOrthof(-100, 100, -100, 100, -500, 500);
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163
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164 f.glMatrixMode(GL_MODELVIEW);
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165 f.glLoadIdentity();
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166
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167 f.glEnable(GL_DEPTH_TEST);
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168 f.glDisable(GL_TEXTURE_2D);
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169 f.glEnable(GL_BLEND);
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170 f.glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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171
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172 f.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
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173 f.glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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174
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175 f.glEnable(GL_POINT_SMOOTH);
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176 f.glHint(GL_POINT_SMOOTH_HINT, GL_NICEST);
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177 f.glPointSize(1.0f);
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178 f.glEnable(GL_FOG);
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179 f.glFogf(GL_FOG_START, -500);
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180 f.glFogf(GL_FOG_END, 500);
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181 f.glFogf(GL_FOG_DENSITY, 0.005);
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182
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183 f.glVertexPointer(3, GL_FLOAT, 0, pixels);
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184 f.glEnableClientState(GL_VERTEX_ARRAY);
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185
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186 do {
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187 f.glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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188
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189 f.glRotatef(2.0, 1.0, 1.0, 1.0);
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190 f.glRotatef(1.0, 0.0, 1.0, 1.0);
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191
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192 f.glColor4f(1.0, 1.0, 1.0, 1.0);
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193
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194 f.glDrawArrays(GL_POINTS, 0, NB_PIXELS);
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195
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196 SDL_GL_SwapBuffers();
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197
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198 while (SDL_PollEvent(&event)) {
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199 if (event.type == SDL_QUIT)
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200 done = 1;
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201 if (event.type == SDL_KEYDOWN)
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202 done = 1;
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203 }
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204
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205 SDL_Delay(20);
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206 }
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207 while (!done);
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208
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209 f.glDisableClientState(GL_VERTEX_ARRAY);
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210
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211 SDL_Quit();
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212 return 0;
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213 }
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214
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215 #else /* HAVE_OPENGLES */
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216
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217 int
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218 main(int argc, char *argv[])
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219 {
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220 printf("No OpenGL ES support on this system\n");
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221 return 1;
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222 }
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223
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224 #endif /* HAVE_OPENGLES */