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annotate XCodeiPhoneOS/Demos/src/happy.c @ 2417:ac26bd83db1f gsoc2008_iphone

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Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
author Holmes Futrell <hfutrell@umail.ucsb.edu>
date Wed, 13 Aug 2008 23:10:51 +0000
parents 1cfe7fd15dad
children
rev   line source
2383
1cfe7fd15dad Happy faces demo (bitmaps)
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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_TextureID texture_id = 0; /* reference to texture holding happyface */
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15
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16 static struct {
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17 float x, y; /* position of happyface */
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18 float xvel, yvel; /* velocity of happyface */
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19 } faces[NUM_HAPPY_FACES];
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20
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21 /*
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22 Sets initial positions and velocities of happyfaces
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23 units of velocity are pixels per millesecond
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24 */
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25 void initializeHappyFaces() {
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26 int i;
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27 for (i=0; i<NUM_HAPPY_FACES; i++) {
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28 faces[i].x = randomFloat(0.0f, SCREEN_WIDTH - HAPPY_FACE_SIZE);
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29 faces[i].y = randomFloat(0.0f, SCREEN_HEIGHT - HAPPY_FACE_SIZE);
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30 faces[i].xvel = randomFloat(-0.1f, 0.1f);
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31 faces[i].yvel = randomFloat(-0.1f, 0.1f);
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32 }
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33 }
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34
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35 void render(void) {
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36
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37 int i;
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38 SDL_Rect srcRect;
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39 SDL_Rect dstRect;
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40
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41 /* setup boundaries for happyface bouncing */
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42 Uint16 maxx = SCREEN_WIDTH - HAPPY_FACE_SIZE;
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43 Uint16 maxy = SCREEN_HEIGHT - HAPPY_FACE_SIZE;
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44 Uint16 minx = 0;
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45 Uint16 miny = 0;
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46
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47 /* setup rects for drawing */
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48 srcRect.x = 0;
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49 srcRect.y = 0;
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50 srcRect.w = HAPPY_FACE_SIZE;
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51 srcRect.h = HAPPY_FACE_SIZE;
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52 dstRect.w = HAPPY_FACE_SIZE;
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53 dstRect.h = HAPPY_FACE_SIZE;
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54
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55 /* fill background in with black */
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56 SDL_RenderFill(0, 0, 0, 255, NULL);
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57
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58 /*
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59 loop through all the happy faces:
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60 - update position
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61 - update velocity (if boundary is hit)
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62 - draw
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63 */
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64 for (i=0; i<NUM_HAPPY_FACES; i++) {
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65 faces[i].x += faces[i].xvel * MILLESECONDS_PER_FRAME;
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66 faces[i].y += faces[i].yvel * MILLESECONDS_PER_FRAME;
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67 if (faces[i].x > maxx) {
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68 faces[i].x = maxx;
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69 faces[i].xvel = -faces[i].xvel;
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70 }
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71 else if (faces[i].y > maxy) {
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72 faces[i].y = maxy;
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73 faces[i].yvel = -faces[i].yvel;
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74 }
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75 if (faces[i].x < minx) {
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76 faces[i].x = minx;
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77 faces[i].xvel = -faces[i].xvel;
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78 }
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79 else if (faces[i].y < miny) {
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80 faces[i].y = miny;
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81 faces[i].yvel = -faces[i].yvel;
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82 }
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83 dstRect.x = faces[i].x;
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84 dstRect.y = faces[i].y;
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85 SDL_RenderCopy(texture_id, &srcRect, &dstRect);
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86 }
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87 /* update screen */
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88 SDL_RenderPresent();
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89
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90 }
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91
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92 /*
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93 loads the happyface graphic into a texture
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94 */
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95 void initializeTexture() {
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96 SDL_Surface *bmp_surface;
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97 SDL_Surface *bmp_surface_rgba;
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98 int format = SDL_PIXELFORMAT_ABGR8888; /* desired texture format */
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99 Uint32 Rmask, Gmask, Bmask, Amask; /* masks for desired format */
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100 int bpp; /* bits per pixel for desired format */
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101 /* load the bmp */
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102 bmp_surface = SDL_LoadBMP("icon.bmp");
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103 if (bmp_surface == NULL) {
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104 fatalError("could not load bmp");
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105 }
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106 /* set white to transparent on the happyface */
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107 SDL_SetColorKey(bmp_surface, 1, SDL_MapRGB(bmp_surface->format, 255, 255, 255));
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108 SDL_PixelFormatEnumToMasks(format, &bpp, &Rmask, &Gmask, &Bmask, &Amask);
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109 /*
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110 create a new RGBA surface and blit the bmp to it
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111 this is an extra step, but it seems to be necessary
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112 is this a bug?
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113 */
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114 bmp_surface_rgba = SDL_CreateRGBSurface(0, bmp_surface->w, bmp_surface->h, bpp, Rmask, Gmask, Bmask, Amask);
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115 SDL_BlitSurface(bmp_surface, NULL, bmp_surface_rgba, NULL);
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116
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117 /* convert RGBA surface to texture */
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118 texture_id = SDL_CreateTextureFromSurface(format, bmp_surface_rgba);
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119 if (texture_id == 0) {
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120 fatalError("could not create texture");
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121 }
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122 SDL_SetTextureBlendMode(texture_id, SDL_TEXTUREBLENDMODE_BLEND);
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123
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124 /* free up allocated memory */
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125 SDL_FreeSurface(bmp_surface_rgba);
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126 SDL_FreeSurface(bmp_surface);
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127 }
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128
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129 int main(int argc, char *argv[]) {
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130
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131 SDL_WindowID windowID;
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132 Uint32 startFrame;
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133 Uint32 endFrame;
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134 Uint32 delay;
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135 int done;
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136
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137 /* initialize SDL */
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138 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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139 fatalError("Could not initialize SDL");
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140 }
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141 windowID = SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,\
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142 SDL_WINDOW_OPENGL|SDL_WINDOW_SHOWN|SDL_WINDOW_BORDERLESS);
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143
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144 SDL_CreateRenderer(windowID, -1, 0);
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145
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146 initializeTexture();
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147 initializeHappyFaces();
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148
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149 /* main loop */
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150 done = 0;
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151 while(!done) {
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152 startFrame = SDL_GetTicks();
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153 SDL_Event event;
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154 while (SDL_PollEvent(&event)) {
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155 if (event.type == SDL_QUIT) {
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156 done = 1;
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157 }
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158 }
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159 render();
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160 endFrame = SDL_GetTicks();
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161
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162 /* figure out how much time we have left, and then sleep */
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163 delay = MILLESECONDS_PER_FRAME - (endFrame - startFrame);
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164 if (delay < 0) {
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165 delay = 0;
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166 } else if (delay > MILLESECONDS_PER_FRAME) {
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167 delay = MILLESECONDS_PER_FRAME;
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168 }
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169 SDL_Delay(delay);
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170 }
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171
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172 /* cleanup */
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173 SDL_DestroyTexture(texture_id);
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174 /* shutdown SDL */
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175 SDL_Quit();
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176
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177 return 0;
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178
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179 }