80 lines
1.6 KiB
C
80 lines
1.6 KiB
C
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#include "SDL.h"
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#include <stdlib.h>
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#define WIDTH 640
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#define HEIGHT 480
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#define BPP 4
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#define DEPTH 32
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void setpixel(SDL_Surface *screen, int x, int y, Uint8 r, Uint8 g, Uint8 b)
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{
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Uint32 *pixmem32;
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Uint32 colour;
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colour = SDL_MapRGB( screen->format, r, g, b );
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pixmem32 = (Uint32*) screen->pixels + y + x;
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*pixmem32 = colour;
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}
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void DrawScreen(SDL_Surface* screen, int h)
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{
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int x, y, ytimesw;
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if(SDL_MUSTLOCK(screen))
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{
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if(SDL_LockSurface(screen) < 0) return;
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}
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for(y = 0; y < screen->h; y++ )
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{
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ytimesw = y*screen->pitch/BPP;
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for( x = 0; x < screen->w; x++ )
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{
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setpixel(screen, x, ytimesw, (x*x)/256+3*y+h, (y*y)/256+x+h, h);
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}
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}
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if(SDL_MUSTLOCK(screen)) SDL_UnlockSurface(screen);
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SDL_Flip(screen);
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}
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int main(int argc, char* argv[])
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{
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SDL_Surface *screen;
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SDL_Event event;
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int keypress = 0;
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int h=0;
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if (SDL_Init(SDL_INIT_VIDEO) < 0 ) return 1;
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if (!(screen = SDL_SetVideoMode(WIDTH, HEIGHT, DEPTH, SDL_FULLSCREEN|SDL_HWSURFACE)))
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{
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SDL_Quit();
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return 1;
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}
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while(!keypress)
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{
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DrawScreen(screen,h++);
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while(SDL_PollEvent(&event))
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{
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switch (event.type)
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{
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case SDL_QUIT:
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keypress = 1;
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break;
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case SDL_KEYDOWN:
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keypress = 1;
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break;
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}
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}
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}
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SDL_Quit();
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return 0;
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}
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