#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <SDL.h>
#define GP2X_PRODUCTION_BUILD
#define LOCK(s) {if(SDL_MUSTLOCK(s))(void)SDL_LockSurface(s);}
#define UNLOCK(s) {if(SDL_MUSTLOCK(s))(void)SDL_UnlockSurface(s);}
void DrawScene(SDL_Surface *scene);
void PutPixel(SDL_Surface *surface, Uint16 x, Uint16 y, Uint8 r, Uint8 g
, Uint8 b);
/* SDL Demo program:
*/
int main()
{
SDL_Surface *screen_ptr = NULL;
SDL_Joystick *joystick_ptr = NULL;
SDL_Event event;
Uint32 col;
int done = 0;
/* Initialize SDL:
*/
if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK) < 0) {
fprintf(stderr, "Couldn't initialize SDL: %s\n"
, SDL_GetError());
return 1;
}
if ( (screen_ptr=SDL_SetVideoMode(320, 240, 8, SDL_SWSURFACE) )
== NULL) {
fprintf(stderr, "Couldn't set video mode: %s\n"
, SDL_GetError());
return 1;
}
if ( (joystick_ptr=SDL_JoystickOpen(0) ) == NULL) {
fprintf(stderr, "Couldn't open the joystick: %s\n"
, SDL_GetError());
return 1;
}
/* Hide cursor:
*/
SDL_ShowCursor(SDL_DISABLE);
/* Initialize screen:
*/
col = SDL_MapRGB(screen_ptr->format, 0xff, 0x00, 0xff);
SDL_FillRect(screen_ptr, NULL, col);
SDL_UpdateRect(screen_ptr, 0,0,0,0);
/* Draw nice scene:
*/
DrawScene(screen_ptr);
SDL_UpdateRect(screen_ptr, 0,0,0,0);
/* Wait for keypress or term:
*/
while (!done)
{
SDL_WaitEvent(&event);
switch (event.type)
{
case SDL_JOYBUTTONDOWN:
case SDL_QUIT:
done=1;
break;
}
/* Be nice:
*/
SDL_Delay(10);
}
/* Close SDL:
*/
SDL_Quit();
/* Return to GP2x menu:
*/
#ifdef GP2X_PRODUCTION_BUILD
chdir("/usr/gp2x");
execl("/usr/gp2x/gp2xmenu", "/usr/gp2x/gp2xmenu", NULL);
#endif
/* Otherwise quit for PC:
*/
return 0;
}
/* Fancy background:
*/
void DrawScene(SDL_Surface *scene)
{
int x,y;
LOCK(scene);
for(x=0; x< scene->w; x++)
for(y=0; y< scene->h; y++)
PutPixel(scene, x, y,
(( (255.0 / scene->w) * (x + 0.0) ) / 16) * 16,
(( (255.0 / scene->h) * (y + 0.0) ) / 16) * 16,
0
);
UNLOCK(scene);
}
/* The mandatory putpixel routine from www.libsdl.org:
*/
void PutPixel(SDL_Surface *surface, Uint16 x, Uint16 y, Uint8 r, Uint8 g
, Uint8 b){
Uint32 color = SDL_MapRGB(surface->format, r, g, b);
switch (surface->format->BytesPerPixel){
case 1: /* 8-bpp */
{
Uint8 *bufp;
bufp = (Uint8 *)surface->pixels + y*surface->pitch + x;
*bufp = color;
}
break;
case 2: // Probably 15-bpp or 16-bpp
{
Uint16 *bufp;
bufp = (Uint16 *)surface->pixels + y*surface->pitch/2 + x;
*bufp = color;
}
break;
case 3: // Slow 24-bpp mode, usually not used
{
Uint8 *bufp;
bufp = (Uint8 *)surface->pixels + y*surface->pitch + x * 3;
if(SDL_BYTEORDER == SDL_LIL_ENDIAN)
{
bufp[0] = color;
bufp[1] = color >> 8;
bufp[2] = color >> 16;
} else {
bufp[2] = color;
bufp[1] = color >> 8;
bufp[0] = color >> 16;
}
}
break;
case 4: // Probably 32-bpp
{
Uint32 *bufp;
bufp = (Uint32 *)surface->pixels + y*surface->pitch/4 + x;
*bufp = color;
}
break;
}
}
