/* Test out the multi-threaded event handling functions */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "SDL.h"
#include "SDL_thread.h"
/* Are we done yet? */
static int done = 0;
/* Is the cursor visible? */
static int visible = 1;
/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
static void quit(int rc)
{
SDL_Quit();
exit(rc);
}
SDL_Surface *LoadIconSurface(char *file, Uint8 **maskp)
{
SDL_Surface *icon;
Uint8 *pixels;
Uint8 *mask;
int mlen, i;
*maskp = NULL;
/* Load the icon surface */
icon = SDL_LoadBMP(file);
if ( icon == NULL ) {
fprintf(stderr, "Couldn't load %s: %s\n", file, SDL_GetError());
return(NULL);
}
/* Check width and height */
if ( (icon->w%8) != 0 ) {
fprintf(stderr, "Icon width must be a multiple of 8!\n");
SDL_FreeSurface(icon);
return(NULL);
}
if ( icon->format->palette == NULL ) {
fprintf(stderr, "Icon must have a palette!\n");
SDL_FreeSurface(icon);
return(NULL);
}
/* Set the colorkey */
SDL_SetColorKey(icon, SDL_SRCCOLORKEY, *((Uint8 *)icon->pixels));
/* Create the mask */
pixels = (Uint8 *)icon->pixels;
printf("Transparent pixel: (%d,%d,%d)\n",
icon->format->palette->colors[*pixels].r,
icon->format->palette->colors[*pixels].g,
icon->format->palette->colors[*pixels].b);
mlen = icon->w*icon->h;
mask = (Uint8 *)malloc(mlen/8);
if ( mask == NULL ) {
fprintf(stderr, "Out of memory!\n");
SDL_FreeSurface(icon);
return(NULL);
}
memset(mask, 0, mlen/8);
for ( i=0; i<mlen; ) {
if ( pixels[i] != *pixels )
mask[i/8] |= 0x01;
++i;
if ( (i%8) != 0 )
mask[i/8] <<= 1;
}
*maskp = mask;
return(icon);
}
int SDLCALL FilterEvents(const SDL_Event *event)
{
static int reallyquit = 0;
switch (event->type) {
case SDL_ACTIVEEVENT:
/* See what happened */
printf("App %s ",
event->active.gain ? "gained" : "lost");
if ( event->active.state & SDL_APPACTIVE )
printf("active ");
if ( event->active.state & SDL_APPMOUSEFOCUS )
printf("mouse ");
if ( event->active.state & SDL_APPINPUTFOCUS )
printf("input ");
printf("focus\n");
/* See if we are iconified or restored */
if ( event->active.state & SDL_APPACTIVE ) {
printf("App has been %s\n",
event->active.gain ?
"restored" : "iconified");
}
return(0);
/* This is important! Queue it if we want to quit. */
case SDL_QUIT:
if ( ! reallyquit ) {
reallyquit = 1;
printf("Quit requested\n");
return(0);
}
printf("Quit demanded\n");
return(1);
/* Mouse and keyboard events go to threads */
case SDL_MOUSEMOTION:
case SDL_MOUSEBUTTONDOWN:
case SDL_MOUSEBUTTONUP:
case SDL_KEYDOWN:
case SDL_KEYUP:
return(1);
/* Drop all other events */
default:
return(0);
}
}
int SDLCALL HandleMouse(void *unused)
{
SDL_Event events[10];
int i, found;
Uint32 mask;
/* Handle mouse events here */
mask = (SDL_MOUSEMOTIONMASK|SDL_MOUSEBUTTONDOWNMASK|SDL_MOUSEBUTTONUPMASK);
while ( ! done ) {
found = SDL_PeepEvents(events, 10, SDL_GETEVENT, mask);
for ( i=0; i<found; ++i ) {
switch(events[i].type) {
/* We want to toggle visibility on buttonpress */
case SDL_MOUSEBUTTONDOWN:
case SDL_MOUSEBUTTONUP:
if ( events[i].button.state == SDL_PRESSED ) {
visible = !visible;
SDL_ShowCursor(visible);
}
printf("Mouse button %d has been %s\n",
events[i].button.button,
(events[i].button.state == SDL_PRESSED) ?
"pressed" : "released");
break;
/* Show relative mouse motion */
case SDL_MOUSEMOTION:
printf("Mouse relative motion: {%d,%d}\n",
events[i].motion.xrel, events[i].motion.yrel);
break;
}
}
/* Give up some CPU to allow events to arrive */
SDL_Delay(20);
}
return(0);
}
int SDLCALL HandleKeyboard(void *unused)
{
SDL_Event events[10];
int i, found;
Uint32 mask;
/* Handle mouse events here */
mask = (SDL_KEYDOWNMASK|SDL_KEYUPMASK);
while ( ! done ) {
found = SDL_PeepEvents(events, 10, SDL_GETEVENT, mask);
for ( i=0; i<found; ++i ) {
switch(events[i].type) {
/* We want to toggle visibility on buttonpress */
case SDL_KEYDOWN:
case SDL_KEYUP:
printf("Key '%c' (keysym==%d) has been %s\n",
events[i].key.keysym.unicode,
(int) events[i].key.keysym.sym,
(events[i].key.state == SDL_PRESSED) ?
"pressed" : "released");
/* Allow hitting <ESC> to quit the app */
if ( events[i].key.keysym.sym == SDLK_ESCAPE ) {
done = 1;
}
/* skip events now that aren't KEYUPs... */
if (events[i].key.state == SDL_PRESSED)
break;
if ( events[i].key.keysym.sym == SDLK_f ) {
int rc = 0;
printf("attempting to toggle fullscreen...\n");
rc = SDL_WM_ToggleFullScreen(SDL_GetVideoSurface());
printf("SDL_WM_ToggleFullScreen returned %d.\n", rc);
}
if ( events[i].key.keysym.sym == SDLK_g ) {
SDL_GrabMode m;
m = SDL_WM_GrabInput(SDL_GRAB_QUERY) == SDL_GRAB_ON ?
SDL_GRAB_OFF : SDL_GRAB_ON;
printf("attempting to toggle input grab to %s...\n",
m == SDL_GRAB_ON ? "ON" : "OFF");
SDL_WM_GrabInput(m);
printf("attempt finished.\n");
}
break;
}
}
/* Give up some CPU to allow events to arrive */
SDL_Delay(20);
}
return(0);
}
int main(int argc, char *argv[])
{
SDL_Surface *screen;
SDL_Surface *icon;
Uint8 *icon_mask;
int i, parsed;
Uint8 *buffer;
SDL_Color palette[256];
Uint32 init_flags;
Uint8 video_bpp;
Uint32 video_flags;
SDL_Thread *mouse_thread;
SDL_Thread *keybd_thread;
/* Set the options, based on command line arguments */
init_flags = SDL_INIT_VIDEO;
video_bpp = 8;
video_flags = SDL_SWSURFACE;
parsed = 1;
while ( parsed ) {
/* If the threaded option is enabled, and the SDL library hasn't
been compiled with threaded events enabled, then the mouse and
keyboard won't respond.
*/
if ( (argc >= 2) && (strcmp(argv[1], "-threaded") == 0) ) {
init_flags |= SDL_INIT_EVENTTHREAD;
argc -= 1;
argv += 1;
printf("Running with threaded events\n");
} else
if ( (argc >= 2) && (strcmp(argv[1], "-fullscreen") == 0) ) {
video_flags |= SDL_FULLSCREEN;
argc -= 1;
argv += 1;
} else
if ( (argc >= 3) && (strcmp(argv[1], "-bpp") == 0) ) {
video_bpp = atoi(argv[2]);
argc -= 2;
argv += 2;
} else {
parsed = 0;
}
}
/* Initialize SDL with the requested flags */
if ( SDL_Init(init_flags) < 0 ) {
fprintf(stderr,
"Couldn't initialize SDL: %s\n", SDL_GetError());
return(1);
}
/* Set the icon -- this must be done before the first mode set */
icon = LoadIconSurface("icon.bmp", &icon_mask);
if ( icon != NULL ) {
SDL_WM_SetIcon(icon, icon_mask);
}
if ( icon_mask != NULL )
free(icon_mask);
/* Initialize the display */
screen = SDL_SetVideoMode(640, 480, video_bpp, video_flags);
if ( screen == NULL ) {
fprintf(stderr, "Couldn't set 640x480x%d video mode: %s\n",
video_bpp, SDL_GetError());
quit(1);
}
printf("Running in %s mode\n", screen->flags & SDL_FULLSCREEN ?
"fullscreen" : "windowed");
/* Enable printable characters */
SDL_EnableUNICODE(1);
/* Set an event filter that discards everything but QUIT */
SDL_SetEventFilter(FilterEvents);
/* Create the event handling threads */
mouse_thread = SDL_CreateThread(HandleMouse, NULL);
keybd_thread = SDL_CreateThread(HandleKeyboard, NULL);
/* Set the surface pixels and refresh! */
for ( i=0; i<256; ++i ) {
palette[i].r = 255-i;
palette[i].g = 255-i;
palette[i].b = 255-i;
}
SDL_SetColors(screen, palette, 0, 256);
if ( SDL_LockSurface(screen) < 0 ) {
fprintf(stderr, "Couldn't lock display surface: %s\n",
SDL_GetError());
quit(2);
}
buffer = (Uint8 *)screen->pixels;
for ( i=0; i<screen->h; ++i ) {
memset(buffer,(i*255)/screen->h,
screen->w*screen->format->BytesPerPixel);
buffer += screen->pitch;
}
SDL_UnlockSurface(screen);
SDL_UpdateRect(screen, 0, 0, 0, 0);
/* Loop, waiting for QUIT */
while ( ! done ) {
if ( ! (init_flags & SDL_INIT_EVENTTHREAD) ) {
SDL_PumpEvents(); /* Needed when event thread is off */
}
if ( SDL_PeepEvents(NULL, 0, SDL_PEEKEVENT, SDL_QUITMASK) ) {
done = 1;
}
/* Give up some CPU so the events can accumulate */
SDL_Delay(20);
}
SDL_WaitThread(mouse_thread, NULL);
SDL_WaitThread(keybd_thread, NULL);
SDL_Quit();
return(0);
}