annotate Xcode-iPhoneOS/Demos/src/happy.c @ 3690:e431b888ac6c

Fixed compilation on iPhone
author Sam Lantinga <slouken@libsdl.org>
date Thu, 21 Jan 2010 16:12:24 +0000
parents 64ce267332c6
children 78db79f5a4e2
rev   line source
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1 /*
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2 * happy.c
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3 * written by Holmes Futrell
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4 * use however you want
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5 */
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6
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7 #include "SDL.h"
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8 #include "common.h"
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9
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10 #define NUM_HAPPY_FACES 100 /* number of faces to draw */
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11 #define MILLESECONDS_PER_FRAME 16 /* about 60 frames per second */
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12 #define HAPPY_FACE_SIZE 32 /* width and height of happyface (pixels) */
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13
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14 static SDL_Texture *texture = 0; /* reference to texture holding happyface */
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15
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16 static struct
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17 {
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18 float x, y; /* position of happyface */
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19 float xvel, yvel; /* velocity of happyface */
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20 } faces[NUM_HAPPY_FACES];
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21
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22 /*
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23 Sets initial positions and velocities of happyfaces
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24 units of velocity are pixels per millesecond
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25 */
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26 void
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27 initializeHappyFaces()
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28 {
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29 int i;
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30 for (i = 0; i < NUM_HAPPY_FACES; i++) {
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31 faces[i].x = randomFloat(0.0f, SCREEN_WIDTH - HAPPY_FACE_SIZE);
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32 faces[i].y = randomFloat(0.0f, SCREEN_HEIGHT - HAPPY_FACE_SIZE);
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33 faces[i].xvel = randomFloat(-0.1f, 0.1f);
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34 faces[i].yvel = randomFloat(-0.1f, 0.1f);
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35 }
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36 }
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37
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38 void
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39 render(void)
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40 {
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41
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42 int i;
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43 SDL_Rect srcRect;
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44 SDL_Rect dstRect;
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45
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46 /* setup boundaries for happyface bouncing */
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47 Uint16 maxx = SCREEN_WIDTH - HAPPY_FACE_SIZE;
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48 Uint16 maxy = SCREEN_HEIGHT - HAPPY_FACE_SIZE;
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49 Uint16 minx = 0;
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50 Uint16 miny = 0;
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51
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52 /* setup rects for drawing */
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53 srcRect.x = 0;
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54 srcRect.y = 0;
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55 srcRect.w = HAPPY_FACE_SIZE;
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56 srcRect.h = HAPPY_FACE_SIZE;
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57 dstRect.w = HAPPY_FACE_SIZE;
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58 dstRect.h = HAPPY_FACE_SIZE;
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59
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60 /* fill background in with black */
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61 SDL_SetRenderDrawColor(0, 0, 0, 255);
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62 SDL_RenderFill(NULL);
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63
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64 /*
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65 loop through all the happy faces:
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66 - update position
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67 - update velocity (if boundary is hit)
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68 - draw
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69 */
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70 for (i = 0; i < NUM_HAPPY_FACES; i++) {
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71 faces[i].x += faces[i].xvel * MILLESECONDS_PER_FRAME;
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72 faces[i].y += faces[i].yvel * MILLESECONDS_PER_FRAME;
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73 if (faces[i].x > maxx) {
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74 faces[i].x = maxx;
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75 faces[i].xvel = -faces[i].xvel;
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76 } else if (faces[i].y > maxy) {
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77 faces[i].y = maxy;
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78 faces[i].yvel = -faces[i].yvel;
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79 }
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80 if (faces[i].x < minx) {
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81 faces[i].x = minx;
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82 faces[i].xvel = -faces[i].xvel;
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83 } else if (faces[i].y < miny) {
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84 faces[i].y = miny;
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85 faces[i].yvel = -faces[i].yvel;
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86 }
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87 dstRect.x = faces[i].x;
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88 dstRect.y = faces[i].y;
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89 SDL_RenderCopy(texture, &srcRect, &dstRect);
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90 }
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91 /* update screen */
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92 SDL_RenderPresent();
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93
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94 }
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95
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96 /*
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97 loads the happyface graphic into a texture
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98 */
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99 void
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100 initializeTexture()
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101 {
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102 SDL_Surface *bmp_surface;
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103 SDL_Surface *bmp_surface_rgba;
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104 int format = SDL_PIXELFORMAT_ABGR8888; /* desired texture format */
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105 Uint32 Rmask, Gmask, Bmask, Amask; /* masks for desired format */
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106 int bpp; /* bits per pixel for desired format */
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107 /* load the bmp */
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108 bmp_surface = SDL_LoadBMP("icon.bmp");
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109 if (bmp_surface == NULL) {
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110 fatalError("could not load bmp");
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111 }
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112 /* set white to transparent on the happyface */
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113 SDL_SetColorKey(bmp_surface, 1,
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114 SDL_MapRGB(bmp_surface->format, 255, 255, 255));
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115 SDL_PixelFormatEnumToMasks(format, &bpp, &Rmask, &Gmask, &Bmask, &Amask);
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116 /*
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117 create a new RGBA surface and blit the bmp to it
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118 this is an extra step, but it seems to be necessary
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119 is this a bug?
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120 */
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121 bmp_surface_rgba =
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122 SDL_CreateRGBSurface(0, bmp_surface->w, bmp_surface->h, bpp, Rmask,
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123 Gmask, Bmask, Amask);
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124 SDL_BlitSurface(bmp_surface, NULL, bmp_surface_rgba, NULL);
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125
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126 /* convert RGBA surface to texture */
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127 texture = SDL_CreateTextureFromSurface(format, bmp_surface_rgba);
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128 if (texture == 0) {
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129 fatalError("could not create texture");
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130 }
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131 SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_BLEND);
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132
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133 /* free up allocated memory */
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134 SDL_FreeSurface(bmp_surface_rgba);
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135 SDL_FreeSurface(bmp_surface);
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136 }
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137
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138 int
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139 main(int argc, char *argv[])
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140 {
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141
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142 SDL_Window *window;
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143 Uint32 startFrame;
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144 Uint32 endFrame;
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145 Uint32 delay;
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146 int done;
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147
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148 /* initialize SDL */
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149 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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150 fatalError("Could not initialize SDL");
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151 }
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152 window = SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,
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153 SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN |
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154 SDL_WINDOW_BORDERLESS);
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155
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156 SDL_CreateRenderer(window, -1, 0);
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157
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158 initializeTexture();
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159 initializeHappyFaces();
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160
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161 /* main loop */
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162 done = 0;
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163 while (!done) {
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164 startFrame = SDL_GetTicks();
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165 SDL_Event event;
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166 while (SDL_PollEvent(&event)) {
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167 if (event.type == SDL_QUIT) {
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168 done = 1;
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169 }
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170 }
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171 render();
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172 endFrame = SDL_GetTicks();
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173
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174 /* figure out how much time we have left, and then sleep */
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175 delay = MILLESECONDS_PER_FRAME - (endFrame - startFrame);
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176 if (delay < 0) {
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177 delay = 0;
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178 } else if (delay > MILLESECONDS_PER_FRAME) {
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179 delay = MILLESECONDS_PER_FRAME;
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180 }
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181 SDL_Delay(delay);
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182 }
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183
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184 /* cleanup */
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185 SDL_DestroyTexture(texture);
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186 /* shutdown SDL */
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187 SDL_Quit();
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188
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189 return 0;
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190
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191 }