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#include <stdlib.h>
#include <SDL.h>
typedef uint8_t u8;
typedef int32_t s32;
typedef uint32_t u32;
#define FPS (1000/50)
#define SPD (3)
int main(int argc, char **argv)
{
// initialize SDL video
if (SDL_Init(SDL_INIT_VIDEO) < 0)
{
fprintf(stderr, "Unable to init SDL: %s\n", SDL_GetError() );
exit(1);
}
// make sure SDL cleans up before exit
atexit(SDL_Quit);
// create a new window
SDL_Surface *pScreen = SDL_SetVideoMode(640, 480, 32, SDL_SWSURFACE);
if (pScreen == NULL)
{
fprintf(stderr, "Unable to set up video: %s\n", SDL_GetError());
exit(1);
}
// load an image
SDL_Surface *pBmp = SDL_LoadBMP("cb.bmp");
if (pBmp == NULL)
{
fprintf(stderr, "Unable to load bitmap: %s\n", SDL_GetError());
exit(1);
}
// centre the bitmap on screen
SDL_Rect dstrect;
s32 nPosX, nPosY;
nPosX = (pScreen->w - pBmp->w) / 2;
nPosY = (pScreen->h - pBmp->h) / 2;
// Ptr sur le buffer clavier de la SDL.
u8 *pKeys = SDL_GetKeyState(NULL);
// program main loop
u32 nTimePrev = SDL_GetTicks();
int done = 0;
while (done == 0)
{
// message processing loop
SDL_Event event;
while (SDL_PollEvent(&event))
{
// check for messages
switch (event.type)
{
// exit if the window is closed
case SDL_QUIT:
done = 1;
break;
// check for keypresses
case SDL_KEYDOWN:
// exit if ESCAPE is pressed
if (event.key.keysym.sym == SDLK_ESCAPE) done = 1;
break;
} // end switch
} // end of message processing
// Keys.
if (pKeys[SDLK_UP]) nPosY -= SPD;
if (pKeys[SDLK_DOWN]) nPosY += SPD;
if (pKeys[SDLK_LEFT]) nPosX -= SPD;
if (pKeys[SDLK_RIGHT]) nPosX += SPD;
// DRAWING STARTS HERE
// clear screen
SDL_FillRect(pScreen, NULL, SDL_MapRGB(pScreen->format, 0, 0, 0));
// draw bitmap
dstrect.x = nPosX;
dstrect.y = nPosY;
SDL_BlitSurface(pBmp, NULL, pScreen, &dstrect);
// DRAWING ENDS HERE
// Régulation simpliste du framerate.
u32 nTimeCur = SDL_GetTicks();
if (nTimeCur - nTimePrev < FPS) SDL_Delay(FPS - (nTimeCur - nTimePrev));
nTimePrev = SDL_GetTicks();
// finally, update the screen :)
SDL_Flip(pScreen);
} // end main loop
// free loaded bitmap
SDL_FreeSurface(pBmp);
// all is well ;)
printf("Exited cleanly\n");
return 0;
} |
