view test/checkkeys.c @ 765:4c2ba6161939

Editors Note: The original patch was modified to use SDL_Delay() instead of nanosleep because nanosleep may not be portable to all systems using SDL with the ALSA backend. This may be a moot point with the switch to blocking writes anyway... Date: Sat, 27 Dec 2003 21:47:36 +0100 From: Michel Daenzer To: Debian Bug Tracking System Subject: [SDL] Bug#225252: [PATCH] ALSA fixes Package: libsdl1.2debian-all Version: 1.2.6-2 Severity: normal Tags: patch For SDL 1.2.6, the ALSA backend was changed to call snd_pcm_open() with SND_PCM_NONBLOCK. That's a good idea per se, however, it causes high CPU usage, interrupted sound and stuttering in some games here. Taking a nanosleep whenever snd_pcm_writei() returns -EAGAIN fixes this, but I think it's more efficient to use blocking mode for the actual sound playback. Feedback from the SDL and ALSA lists appreciated. The patch also fixes the default ALSA device to be used.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 04 Jan 2004 15:40:50 +0000
parents 806fcbde0af3
children be9c9c8f6d53
line wrap: on
line source


/* 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 "SDL.h"

static void print_modifiers(void)
{
	int mod;
	printf(" modifiers:");
	mod = SDL_GetModState();
	if(!mod) {
		printf(" (none)");
		return;
	}
	if(mod & KMOD_LSHIFT)
		printf(" LSHIFT");
	if(mod & KMOD_RSHIFT)
		printf(" RSHIFT");
	if(mod & KMOD_LCTRL)
		printf(" LCTRL");
	if(mod & KMOD_RCTRL)
		printf(" RCTRL");
	if(mod & KMOD_LALT)
		printf(" LALT");
	if(mod & KMOD_RALT)
		printf(" RALT");
	if(mod & KMOD_LMETA)
		printf(" LMETA");
	if(mod & KMOD_RMETA)
		printf(" RMETA");
	if(mod & KMOD_NUM)
		printf(" NUM");
	if(mod & KMOD_CAPS)
		printf(" CAPS");
	if(mod & KMOD_MODE)
		printf(" MODE");
}

static void PrintKey(SDL_keysym *sym, int pressed)
{
	/* Print the keycode, name and state */
	if ( sym->sym ) {
		printf("Key %s:  %d-%s ", pressed ?  "pressed" : "released",
					sym->sym, SDL_GetKeyName(sym->sym));
	} else {
		printf("Unknown Key (scancode = %d) %s ", sym->scancode,
					pressed ?  "pressed" : "released");
	}

	/* Print the translated character, if one exists */
	if ( sym->unicode ) {
		/* Is it a control-character? */
		if ( sym->unicode < ' ' ) {
			printf(" (^%c)", sym->unicode+'@');
		} else {
#ifdef UNICODE
			printf(" (%c)", sym->unicode);
#else
			/* This is a Latin-1 program, so only show 8-bits */
			if ( !(sym->unicode & 0xFF00) )
				printf(" (%c)", sym->unicode);
#endif
		}
	}
	print_modifiers();
	printf("\n");
}

int main(int argc, char *argv[])
{
	SDL_Event event;
	int done;
	Uint32 videoflags;

	/* Initialize SDL */
	if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
		fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
		exit(1);
	}
	atexit(SDL_Quit);

	videoflags = SDL_SWSURFACE;
	while( argc > 1 ) {
		--argc;
		if ( argv[argc] && !strcmp(argv[argc], "-fullscreen") ) {
			videoflags |= SDL_FULLSCREEN;
		} else {
			fprintf(stderr, "Usage: %s [-fullscreen]\n", argv[0]);
			exit(1);
		}
	}

	/* Set 640x480 video mode */
	if ( SDL_SetVideoMode(640, 480, 0, videoflags) == NULL ) {
		fprintf(stderr, "Couldn't set 640x480 video mode: %s\n",
							SDL_GetError());
		exit(2);
	}

	/* Enable UNICODE translation for keyboard input */
	SDL_EnableUNICODE(1);

	/* Enable auto repeat for keyboard input */
	SDL_EnableKeyRepeat(SDL_DEFAULT_REPEAT_DELAY,
	                    SDL_DEFAULT_REPEAT_INTERVAL);

	/* Watch keystrokes */
	done = 0;
	while ( !done ) {
		/* Check for events */
		SDL_WaitEvent(&event);
		switch (event.type) {
			case SDL_KEYDOWN:
				PrintKey(&event.key.keysym, 1);
				break;
			case SDL_KEYUP:
				PrintKey(&event.key.keysym, 0);
				break;
			case SDL_MOUSEBUTTONDOWN:
				/* Any button press quits the app... */
			case SDL_QUIT:
				done = 1;
				break;
			default:
				break;
		}
	}
	return(0);
}