74 lines
1.6 KiB
C
Executable File
74 lines
1.6 KiB
C
Executable File
#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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if (SDL_LockSurface(screen) < 0)
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return;
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}
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for (y = 0; y < screen->h; y++) {
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ytimesw = y * screen->pitch / BPP;
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for (x = 0; x < screen->w; x++) {
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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))
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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)
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return 1;
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if (!(screen = SDL_SetVideoMode(WIDTH, HEIGHT, DEPTH, SDL_FULLSCREEN | SDL_HWSURFACE))) {
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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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DrawScreen(screen, h++);
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while (SDL_PollEvent(&event)) {
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switch (event.type) {
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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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