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Modified happy.c demo which uses SDL_iPhoneSetAnimationCallback

happy.c (text/x-csrc), 4.79 KB, created by Alex Szpakowski on 2015-04-07 22:15:27 UTC

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Filename:

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Creator: Alex Szpakowski

Created: 2015-04-07 22:15:27 UTC

Size: 4.79 KB

patch

obsolete

>/*
> *  happy.c
> *  written by Holmes Futrell
> *  use however you want
> */
>
>#include "SDL.h"
>#include "common.h"
>
>#define NUM_HAPPY_FACES 100     /* number of faces to draw */
>#define MILLESECONDS_PER_FRAME 16       /* about 60 frames per second */
>#define HAPPY_FACE_SIZE 32      /* width and height of happyface (pixels) */
>
>#define USE_CALLBACK
>
>static SDL_Texture *texture = 0;    /* reference to texture holding happyface */
>
>static struct
>{
>    float x, y;                 /* position of happyface */
>    float xvel, yvel;           /* velocity of happyface */
>} faces[NUM_HAPPY_FACES];
>
>/*
>    Sets initial positions and velocities of happyfaces
>    units of velocity are pixels per millesecond
>*/
>void
>initializeHappyFaces()
>{
>    int i;
>    for (i = 0; i < NUM_HAPPY_FACES; i++) {
>        faces[i].x = randomFloat(0.0f, SCREEN_WIDTH - HAPPY_FACE_SIZE);
>        faces[i].y = randomFloat(0.0f, SCREEN_HEIGHT - HAPPY_FACE_SIZE);
>        faces[i].xvel = randomFloat(-0.1f, 0.1f);
>        faces[i].yvel = randomFloat(-0.1f, 0.1f);
>    }
>}
>
>void
>render(SDL_Renderer *renderer)
>{
>
>    int i;
>    SDL_Rect srcRect;
>    SDL_Rect dstRect;
>
>    /* setup boundaries for happyface bouncing */
>    Uint16 maxx = SCREEN_WIDTH - HAPPY_FACE_SIZE;
>    Uint16 maxy = SCREEN_HEIGHT - HAPPY_FACE_SIZE;
>    Uint16 minx = 0;
>    Uint16 miny = 0;
>
>    /* setup rects for drawing */
>    srcRect.x = 0;
>    srcRect.y = 0;
>    srcRect.w = HAPPY_FACE_SIZE;
>    srcRect.h = HAPPY_FACE_SIZE;
>    dstRect.w = HAPPY_FACE_SIZE;
>    dstRect.h = HAPPY_FACE_SIZE;
>
>    /* fill background in with black */
>    SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
>    SDL_RenderClear(renderer);
>
>    /*
>       loop through all the happy faces:
>       - update position
>       - update velocity (if boundary is hit)
>       - draw
>     */
>    for (i = 0; i < NUM_HAPPY_FACES; i++) {
>        faces[i].x += faces[i].xvel * MILLESECONDS_PER_FRAME;
>        faces[i].y += faces[i].yvel * MILLESECONDS_PER_FRAME;
>        if (faces[i].x > maxx) {
>            faces[i].x = maxx;
>            faces[i].xvel = -faces[i].xvel;
>        } else if (faces[i].y > maxy) {
>            faces[i].y = maxy;
>            faces[i].yvel = -faces[i].yvel;
>        }
>        if (faces[i].x < minx) {
>            faces[i].x = minx;
>            faces[i].xvel = -faces[i].xvel;
>        } else if (faces[i].y < miny) {
>            faces[i].y = miny;
>            faces[i].yvel = -faces[i].yvel;
>        }
>        dstRect.x = faces[i].x;
>        dstRect.y = faces[i].y;
>        SDL_RenderCopy(renderer, texture, &srcRect, &dstRect);
>    }
>    /* update screen */
>    SDL_RenderPresent(renderer);
>
>}
>
>/*
>    loads the happyface graphic into a texture
>*/
>void
>initializeTexture(SDL_Renderer *renderer)
>{
>    SDL_Surface *bmp_surface;
>    /* load the bmp */
>    bmp_surface = SDL_LoadBMP("icon.bmp");
>    if (bmp_surface == NULL) {
>        fatalError("could not load bmp");
>    }
>    /* set white to transparent on the happyface */
>    SDL_SetColorKey(bmp_surface, 1,
>                    SDL_MapRGB(bmp_surface->format, 255, 255, 255));
>
>    /* convert RGBA surface to texture */
>    texture = SDL_CreateTextureFromSurface(renderer, bmp_surface);
>    if (texture == 0) {
>        fatalError("could not create texture");
>    }
>    SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_BLEND);
>
>    /* free up allocated memory */
>    SDL_FreeSurface(bmp_surface);
>}
>
>static void callback(void *param)
>{
>    render((SDL_Renderer *) param);
>}
>
>int
>main(int argc, char *argv[])
>{
>
>    SDL_Window *window;
>    SDL_Renderer *renderer;
>    Uint32 startFrame;
>    Uint32 endFrame;
>    Uint32 delay;
>    int done;
>
>    /* initialize SDL */
>    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
>        fatalError("Could not initialize SDL");
>    }
>    window = SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,
>                                SDL_WINDOW_OPENGL |
>                                SDL_WINDOW_BORDERLESS);
>
>    renderer = SDL_CreateRenderer(window, -1, 0);
>
>#ifdef USE_CALLBACK
>    SDL_iPhoneSetAnimationCallback(window, 1, callback, renderer);
>#endif
>
>    initializeTexture(renderer);
>    initializeHappyFaces();
>
>    /* main loop */
>    done = 0;
>    while (!done) {
>        startFrame = SDL_GetTicks();
>        SDL_Event event;
>        while (SDL_PollEvent(&event)) {
>            if (event.type == SDL_QUIT) {
>                done = 1;
>            }
>        }
>
>#ifndef USE_CALLBACK
>        render(renderer);
>#endif
>
>        endFrame = SDL_GetTicks();
>
>        /* figure out how much time we have left, and then sleep */
>        delay = MILLESECONDS_PER_FRAME - (endFrame - startFrame);
>        if (delay < 0) {
>            delay = 0;
>        } else if (delay > MILLESECONDS_PER_FRAME) {
>            delay = MILLESECONDS_PER_FRAME;
>        }
>        SDL_Delay(delay);
>    }
>
>    /* cleanup */
>    SDL_DestroyTexture(texture);
>    /* shutdown SDL */
>    SDL_Quit();
>
>    return 0;
>
>}

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Attachments on bug 2826: 2108 | 2109

We are currently migrating Bugzilla to GitHub issues.Any changes made to the bug tracker now will be lost, so please do not post new bugs or make changes to them.When we're done, all bug URLs will redirect to their equivalent location on the new bug tracker.

We are currently migrating Bugzilla to GitHub issues.
Any changes made to the bug tracker now will be lost, so please do not post new bugs or make changes to them.
When we're done, all bug URLs will redirect to their equivalent location on the new bug tracker.