Mercurial > sdl-ios-xcode

annotate Xcode/TemplatesForProjectBuilder/SDL OpenGL Application/main.c @ 2215:23a2cb765052

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make indent
author Bob Pendleton <bob@pendleton.com>
date Wed, 25 Jul 2007 21:23:28 +0000
parents 59a667370c57
children 4d2d0548f5b2
rev   line source
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1
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2 /* Simple program: Create a blank window, wait for keypress, quit.
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3
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4 Please see the SDL documentation for details on using the SDL API:
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5 /Developer/Documentation/SDL/docs.html
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6 */
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7
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8 #include <stdio.h>
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9 #include <stdlib.h>
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10 #include <string.h>
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11 #include <math.h>
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12
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13 #include "SDL.h"
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14
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15 extern void Atlantis_Init();
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16 extern void Atlantis_Reshape(int w, int h);
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17 extern void Atlantis_Animate();
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18 extern void Atlantis_Display();
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19
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20 static SDL_Surface *gScreen;
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21
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22 static void
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23 initAttributes()
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24 {
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25 // Setup attributes we want for the OpenGL context
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26
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27 int value;
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28
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29 // Don't set color bit sizes (SDL_GL_RED_SIZE, etc)
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30 // Mac OS X will always use 8-8-8-8 ARGB for 32-bit screens and
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31 // 5-5-5 RGB for 16-bit screens
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32
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33 // Request a 16-bit depth buffer (without this, there is no depth buffer)
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34 value = 16;
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35 SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, value);
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36
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37
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38 // Request double-buffered OpenGL
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39 // The fact that windows are double-buffered on Mac OS X has no effect
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40 // on OpenGL double buffering.
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41 value = 1;
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42 SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, value);
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43 }
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44
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45 static void
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46 printAttributes()
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47 {
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48 // Print out attributes of the context we created
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49 int nAttr;
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50 int i;
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51
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52 int attr[] = { SDL_GL_RED_SIZE, SDL_GL_BLUE_SIZE, SDL_GL_GREEN_SIZE,
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53 SDL_GL_ALPHA_SIZE, SDL_GL_BUFFER_SIZE, SDL_GL_DEPTH_SIZE
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54 };
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55
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56 char *desc[] = { "Red size: %d bits\n", "Blue size: %d bits\n",
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57 "Green size: %d bits\n",
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58 "Alpha size: %d bits\n", "Color buffer size: %d bits\n",
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59 "Depth bufer size: %d bits\n"
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60 };
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61
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62 nAttr = sizeof(attr) / sizeof(int);
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63
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64 for (i = 0; i < nAttr; i++) {
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65
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66 int value;
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67 SDL_GL_GetAttribute(attr[i], &value);
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68 printf(desc[i], value);
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69 }
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70 }
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71
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72 static void
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73 createSurface(int fullscreen)
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74 {
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75 Uint32 flags = 0;
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76
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77 flags = SDL_OPENGL;
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78 if (fullscreen)
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79 flags |= SDL_FULLSCREEN;
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80
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81 // Create window
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82 gScreen = SDL_SetVideoMode(640, 480, 0, flags);
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83 if (gScreen == NULL) {
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84
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85 fprintf(stderr, "Couldn't set 640x480 OpenGL video mode: %s\n",
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86 SDL_GetError());
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87 SDL_Quit();
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88 exit(2);
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89 }
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90 }
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91
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92 static void
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93 initGL()
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94 {
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95 Atlantis_Init();
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96 Atlantis_Reshape(gScreen->w, gScreen->h);
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97 }
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98
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99 static void
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100 drawGL()
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101 {
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102 Atlantis_Animate();
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103 Atlantis_Display();
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104 }
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105
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106 static void
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107 mainLoop()
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108 {
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109 SDL_Event event;
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110 int done = 0;
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111 int fps = 24;
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112 int delay = 1000 / fps;
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113 int thenTicks = -1;
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114 int nowTicks;
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115
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116 while (!done) {
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117
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118 /* Check for events */
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119 while (SDL_PollEvent(&event)) {
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120 switch (event.type) {
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121
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122 case SDL_MOUSEMOTION:
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123 break;
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124 case SDL_MOUSEBUTTONDOWN:
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125 break;
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126 case SDL_KEYDOWN:
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127 /* Any keypress quits the app... */
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128 case SDL_QUIT:
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129 done = 1;
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130 break;
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131 default:
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132 break;
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133 }
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134 }
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135
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136 // Draw at 24 hz
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137 // This approach is not normally recommended - it is better to
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138 // use time-based animation and run as fast as possible
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139 drawGL();
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140 SDL_GL_SwapBuffers();
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141
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142 // Time how long each draw-swap-delay cycle takes
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143 // and adjust delay to get closer to target framerate
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144 if (thenTicks > 0) {
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145 nowTicks = SDL_GetTicks();
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146 delay += (1000 / fps - (nowTicks - thenTicks));
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147 thenTicks = nowTicks;
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148 if (delay < 0)
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149 delay = 1000 / fps;
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150 } else {
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151 thenTicks = SDL_GetTicks();
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152 }
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153
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154 SDL_Delay(delay);
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155 }
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156 }
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157
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158 int
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159 main(int argc, char *argv[])
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160 {
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161 // Init SDL video subsystem
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162 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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163
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164 fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
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165 exit(1);
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166 }
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167 // Set GL context attributes
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168 initAttributes();
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169
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170 // Create GL context
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171 createSurface(0);
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172
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173 // Get GL context attributes
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174 printAttributes();
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175
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176 // Init GL state
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177 initGL();
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178
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179 // Draw, get events...
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180 mainLoop();
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181
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182 // Cleanup
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183 SDL_Quit();
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184
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185 return 0;
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186 }