Mercurial > sdl-ios-xcode
annotate Xcode/TemplatesForProjectBuilder/SDL OpenGL Application/main.c @ 2997:e4f025078c1c
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author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 04 Jan 2009 23:41:09 +0000 |
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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 initAttributes () |
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23 { |
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24 // Setup attributes we want for the OpenGL context |
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25 |
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26 int value; |
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27 |
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28 // Don't set color bit sizes (SDL_GL_RED_SIZE, etc) |
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29 // Mac OS X will always use 8-8-8-8 ARGB for 32-bit screens and |
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30 // 5-5-5 RGB for 16-bit screens |
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31 |
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32 // Request a 16-bit depth buffer (without this, there is no depth buffer) |
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33 value = 16; |
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34 SDL_GL_SetAttribute (SDL_GL_DEPTH_SIZE, value); |
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35 |
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36 |
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37 // Request double-buffered OpenGL |
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38 // The fact that windows are double-buffered on Mac OS X has no effect |
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39 // on OpenGL double buffering. |
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40 value = 1; |
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41 SDL_GL_SetAttribute (SDL_GL_DOUBLEBUFFER, value); |
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42 } |
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43 |
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44 static void printAttributes () |
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45 { |
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46 // Print out attributes of the context we created |
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47 int nAttr; |
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48 int i; |
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49 |
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50 int attr[] = { SDL_GL_RED_SIZE, SDL_GL_BLUE_SIZE, SDL_GL_GREEN_SIZE, |
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51 SDL_GL_ALPHA_SIZE, SDL_GL_BUFFER_SIZE, SDL_GL_DEPTH_SIZE }; |
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52 |
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53 char *desc[] = { "Red size: %d bits\n", "Blue size: %d bits\n", "Green size: %d bits\n", |
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54 "Alpha size: %d bits\n", "Color buffer size: %d bits\n", |
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55 "Depth bufer size: %d bits\n" }; |
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56 |
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57 nAttr = sizeof(attr) / sizeof(int); |
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58 |
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59 for (i = 0; i < nAttr; i++) { |
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60 |
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61 int value; |
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62 SDL_GL_GetAttribute (attr[i], &value); |
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63 printf (desc[i], value); |
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64 } |
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65 } |
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66 |
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67 static void createSurface (int fullscreen) |
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68 { |
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69 Uint32 flags = 0; |
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70 |
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71 flags = SDL_OPENGL; |
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72 if (fullscreen) |
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73 flags |= SDL_FULLSCREEN; |
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74 |
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75 // Create window |
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76 gScreen = SDL_SetVideoMode (640, 480, 0, flags); |
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77 if (gScreen == NULL) { |
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78 |
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79 fprintf (stderr, "Couldn't set 640x480 OpenGL video mode: %s\n", |
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80 SDL_GetError()); |
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81 SDL_Quit(); |
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82 exit(2); |
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83 } |
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84 } |
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85 |
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86 static void initGL () |
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87 { |
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88 Atlantis_Init (); |
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89 Atlantis_Reshape (gScreen->w, gScreen->h); |
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90 } |
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91 |
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92 static void drawGL () |
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93 { |
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94 Atlantis_Animate (); |
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95 Atlantis_Display (); |
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96 } |
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97 |
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98 static void mainLoop () |
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99 { |
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100 SDL_Event event; |
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101 int done = 0; |
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102 int fps = 24; |
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103 int delay = 1000/fps; |
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104 int thenTicks = -1; |
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105 int nowTicks; |
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106 |
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107 while ( !done ) { |
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108 |
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109 /* Check for events */ |
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110 while ( SDL_PollEvent (&event) ) { |
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111 switch (event.type) { |
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112 |
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113 case SDL_MOUSEMOTION: |
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114 break; |
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115 case SDL_MOUSEBUTTONDOWN: |
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116 break; |
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117 case SDL_KEYDOWN: |
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118 /* Any keypress quits the app... */ |
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119 case SDL_QUIT: |
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120 done = 1; |
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121 break; |
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122 default: |
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123 break; |
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124 } |
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125 } |
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126 |
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127 // Draw at 24 hz |
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128 // This approach is not normally recommended - it is better to |
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129 // use time-based animation and run as fast as possible |
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130 drawGL (); |
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131 SDL_GL_SwapBuffers (); |
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132 |
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133 // Time how long each draw-swap-delay cycle takes |
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134 // and adjust delay to get closer to target framerate |
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135 if (thenTicks > 0) { |
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136 nowTicks = SDL_GetTicks (); |
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137 delay += (1000/fps - (nowTicks-thenTicks)); |
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138 thenTicks = nowTicks; |
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139 if (delay < 0) |
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140 delay = 1000/fps; |
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141 } |
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142 else { |
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143 thenTicks = SDL_GetTicks (); |
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144 } |
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145 |
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146 SDL_Delay (delay); |
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147 } |
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148 } |
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149 |
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150 int main(int argc, char *argv[]) |
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151 { |
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152 // Init SDL video subsystem |
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153 if ( SDL_Init (SDL_INIT_VIDEO) < 0 ) { |
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154 |
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155 fprintf(stderr, "Couldn't initialize SDL: %s\n", |
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156 SDL_GetError()); |
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157 exit(1); |
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158 } |
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159 |
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160 // Set GL context attributes |
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161 initAttributes (); |
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162 |
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163 // Create GL context |
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164 createSurface (0); |
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165 |
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166 // Get GL context attributes |
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167 printAttributes (); |
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168 |
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169 // Init GL state |
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170 initGL (); |
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171 |
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172 // Draw, get events... |
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173 mainLoop (); |
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174 |
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175 // Cleanup |
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176 SDL_Quit(); |
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177 |
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178 return 0; |
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179 } |