forums.ps2dev.org

/* Simple program: Loop, watching keystrokes
Note that you need to call SDL_PollEvent() or SDL_WaitEvent() to
pump the event loop and catch keystrokes.
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <debug.h>

#include <SDL.h>


#define WIDTH 640
#define HEIGHT 480
#define BPP 4
#define DEPTH 32

void setpixel(SDL_Surface *screen, int x, int y, Uint8 r, Uint8 g, Uint8 b)
{
Uint32 *pixmem32;
Uint32 colour;

colour = SDL_MapRGB( screen->format, r, g, b );

pixmem32 = (Uint32*) screen->pixels + y + x;
*pixmem32 = colour;
}


void DrawScreen(SDL_Surface* screen, int h)
{
int x, y, ytimesw;

if(SDL_MUSTLOCK(screen))
{
if(SDL_LockSurface(screen) < 0) return;
}

for(y = 0; y < screen->h; y++ )
{
ytimesw = y*screen->pitch/BPP;
for( x = 0; x < screen->w; x++ )
{
setpixel(screen, x, ytimesw, (x*x)/256+3*y+h, (y*y)/256+x+h, h);
}
}

if(SDL_MUSTLOCK(screen)) SDL_UnlockSurface(screen);

SDL_Flip(screen);
}


int main(int argc, char* argv[])
{
SDL_Surface *screen;
SDL_Event event;

int keypress = 0;
int h=0;

if (SDL_Init(SDL_INIT_VIDEO) < 0 ) return 1;

if (!(screen = SDL_SetVideoMode(WIDTH, HEIGHT, DEPTH, SDL_FULLSCREEN|SDL_HWSURFACE)))
{
SDL_Quit();
return 1;
}

while(!keypress)
{
DrawScreen(screen,h++);
while(SDL_PollEvent(&event))
{
switch (event.type)
{
case SDL_QUIT:
keypress = 1;
break;
case SDL_KEYDOWN:
keypress = 1;
break;
}
}
}

SDL_Quit();

return 0;
}