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annotate XCodeiPhoneOS/Template/SDL Application/main.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 71edb7a747d7
children
rev   line source
2396
71edb7a747d7 XCode template for iPhone SDL projects
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1 /*
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2 * rectangles.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 <time.h>
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9
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10 #define SCREEN_WIDTH 320
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11 #define SCREEN_HEIGHT 480
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12
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13 int randomInt(int min, int max) {
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14 return min + rand() % (max - min + 1);
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15 }
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16
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17 void render(void) {
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18
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19 Uint8 r, g, b;
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20 /* Come up with a random rectangle */
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21 SDL_Rect rect;
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22 rect.w = randomInt(64, 128);
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23 rect.h = randomInt(64, 128);
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24 rect.x = randomInt(0, SCREEN_WIDTH);
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25 rect.y = randomInt(0, SCREEN_HEIGHT);
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26
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27 /* Come up with a random color */
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28 r = randomInt(50, 255);
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29 g = randomInt(50, 255);
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30 b = randomInt(50, 255);
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31
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32 /* Fill the rectangle in the color */
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33 SDL_RenderFill(r, g, b, 255, &rect);
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34
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35 /* update screen */
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36 SDL_RenderPresent();
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37
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38 }
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39
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40 int main(int argc, char *argv[]) {
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41
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42 SDL_WindowID windowID;
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43 int done;
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44 SDL_Event event;
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45
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46 /* initialize SDL */
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47 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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48 printf("Could not initialize SDL\n");
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49 }
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50
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51 /* seed random number generator */
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52 srand(time(NULL));
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53
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54 /* create window and renderer */
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55 windowID = SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_OPENGL|SDL_WINDOW_SHOWN);
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56 if (windowID == 0) {
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57 printf("Could not initialize Window\n");
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58 }
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59 if (SDL_CreateRenderer(windowID, -1, 0) != 0) {
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60 printf("Could not create renderer\n");
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61 }
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62
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63 /* Fill screen with black */
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64 SDL_RenderFill(0,0,0,0, NULL);
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65
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66 /* Enter render loop, waiting for user to quit */
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67 done = 0;
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68 while(!done) {
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69 while (SDL_PollEvent(&event)) {
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70 if (event.type == SDL_QUIT) {
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71 done = 1;
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72 }
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73 }
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74 render();
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75 SDL_Delay(1);
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76 }
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77
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78 /* shutdown SDL */
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79 SDL_Quit();
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80
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81 return 0;
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82 }