C++ SDL_NAME函数代码示例

static int Audio_Available(void)
{
	pa_sample_spec paspec;
	pa_simple *connection;
	int available;

	available = 0;
	if ( LoadPulseLibrary() < 0 ) {
		return available;
	}
	
	/* Connect with a dummy format. */
	paspec.format = PA_SAMPLE_U8;
	paspec.rate = 11025;
	paspec.channels = 1;
	connection = SDL_NAME(pa_simple_new)(
		SDL_getenv("PASERVER"),      /* server */
		"Test stream",               /* application name */
		PA_STREAM_PLAYBACK,          /* playback mode */
		SDL_getenv("PADEVICE"),      /* device on the server */
		"Simple DirectMedia Layer",  /* stream description */
		&paspec,                     /* sample format spec */
		NULL,                        /* channel map */
		NULL,                        /* buffering attributes */
		NULL                         /* error code */
	);
	if ( connection != NULL ) {
		available = 1;
		SDL_NAME(pa_simple_free)(connection);
	}
	
	UnloadPulseLibrary();
	return(available);
}

static int DGA_Available(void)
{
	const char *display;
	Display *dpy;
	int available;

	/* The driver is available is available if the display is local
	   and the DGA 2.0+ extension is available, and we can map mem.
	*/
	available = 0;
	display = NULL;
	if ( (strncmp(XDisplayName(display), ":", 1) == 0) ||
	     (strncmp(XDisplayName(display), "unix:", 5) == 0) ) {
		dpy = XOpenDisplay(display);
		if ( dpy ) {
			int events, errors, major, minor;

			if ( SDL_NAME(XDGAQueryExtension)(dpy, &events, &errors) &&
			     SDL_NAME(XDGAQueryVersion)(dpy, &major, &minor) ) {
				int screen;

				screen = DefaultScreen(dpy);
				if ( (major >= 2) && 
				     SDL_NAME(XDGAOpenFramebuffer)(dpy, screen) ) {
					available = 1;
					SDL_NAME(XDGACloseFramebuffer)(dpy, screen);
				}
			}
			XCloseDisplay(dpy);
		}
	}
	return(available);
}

static int Audio_Available(void)
{
	pa_sample_spec paspec;
	pa_simple *connection;
	int available;

	available = 0;
	if ( LoadPulseLibrary() < 0 ) {
		return available;
	}

	
	paspec.format = PA_SAMPLE_U8;
	paspec.rate = 11025;
	paspec.channels = 1;
	connection = SDL_NAME(pa_simple_new)(
		NULL,                        
		"Test stream",               
		PA_STREAM_PLAYBACK,          
		NULL,                        
		"Simple DirectMedia Layer",  
		&paspec,                     
		NULL,                        
		NULL,                        
		NULL                         
	);
	if ( connection != NULL ) {
		available = 1;
		SDL_NAME(pa_simple_free)(connection);
	}

	UnloadPulseLibrary();
	return(available);
}

static void ALSA_PlayAudio(_THIS)
{
	int status;
	snd_pcm_uframes_t frames_left;
	const Uint8 *sample_buf = (const Uint8 *) mixbuf;
	const int frame_size = (((int) (this->spec.format & 0xFF)) / 8) * this->spec.channels;

	swizzle_alsa_channels(this);

	frames_left = ((snd_pcm_uframes_t) this->spec.samples);

	while ( frames_left > 0 && this->enabled ) {
		/* This works, but needs more testing before going live */
		/*SDL_NAME(snd_pcm_wait)(pcm_handle, -1);*/

		status = SDL_NAME(snd_pcm_writei)(pcm_handle, sample_buf, frames_left);
		if ( status < 0 ) {
			if ( status == -EAGAIN ) {
				/* Apparently snd_pcm_recover() doesn't handle this case - does it assume snd_pcm_wait() above? */
				SDL_Delay(1);
				continue;
			}
			status = SDL_NAME(snd_pcm_recover)(pcm_handle, status, 0);
			if ( status < 0 ) {
				/* Hmm, not much we can do - abort */
				fprintf(stderr, "ALSA write failed (unrecoverable): %s\n", SDL_NAME(snd_strerror)(status));
				this->enabled = 0;
				return;
			}
			continue;
		}
		sample_buf += status * frame_size;
		frames_left -= status;
	}
}

static int
ESD_Init(SDL_AudioDriverImpl * impl)
{
    if (LoadESDLibrary() < 0) {
        return 0;
    } else {
        int connection = 0;

        /* Don't start ESD if it's not running */
        SDL_setenv("ESD_NO_SPAWN", "1", 0);

        connection = SDL_NAME(esd_open_sound) (NULL);
        if (connection < 0) {
            UnloadESDLibrary();
            SDL_SetError("ESD: esd_open_sound failed (no audio server?)");
            return 0;
        }
        SDL_NAME(esd_close) (connection);
    }

    /* Set the function pointers */
    impl->OpenDevice = ESD_OpenDevice;
    impl->PlayDevice = ESD_PlayDevice;
    impl->WaitDevice = ESD_WaitDevice;
    impl->GetDeviceBuf = ESD_GetDeviceBuf;
    impl->CloseDevice = ESD_CloseDevice;
    impl->Deinitialize = ESD_Deinitialize;
    impl->OnlyHasDefaultOutputDevice = 1;

    return 1;   /* this audio target is available. */
}

static int ARTS_Suspend(void)
{
	const Uint32 abortms = SDL_GetTicks() + 3000; 
	while ( (!SDL_NAME(arts_suspended)()) && (SDL_GetTicks() < abortms) ) {
		if ( SDL_NAME(arts_suspend)() ) {
			break;
		}
	}

	return SDL_NAME(arts_suspended)();
}

static void PULSE_CloseAudio(_THIS)
{
	if ( mixbuf != NULL ) {
		SDL_FreeAudioMem(mixbuf);
		mixbuf = NULL;
	}
	if ( stream != NULL ) {
		SDL_NAME(pa_simple_drain)(stream, NULL);
		SDL_NAME(pa_simple_free)(stream);
		stream = NULL;
	}
}

static void ALSA_CloseAudio(_THIS)
{
	if ( mixbuf != NULL ) {
		SDL_FreeAudioMem(mixbuf);
		mixbuf = NULL;
	}
	if ( pcm_handle ) {
		SDL_NAME(snd_pcm_drain)(pcm_handle);
		SDL_NAME(snd_pcm_close)(pcm_handle);
		pcm_handle = NULL;
	}
}

static void ARTSC_CloseAudio(_THIS)
{
	if ( mixbuf != NULL ) {
		SDL_FreeAudioMem(mixbuf);
		mixbuf = NULL;
	}
	if ( stream ) {
		SDL_NAME(arts_close_stream)(stream);
		stream = 0;
	}
	SDL_NAME(arts_free)();
}

static int DGA_DispatchEvent(_THIS)
{
	int posted;
	SDL_NAME(XDGAEvent) xevent;

	XNextEvent(DGA_Display, (XEvent *)&xevent);

	posted = 0;
	xevent.type -= DGA_event_base;
	switch (xevent.type) {

	    /* Mouse motion? */
	    case MotionNotify: {
		if ( SDL_VideoSurface ) {
			posted = SDL_PrivateMouseMotion(0, 1,
					xevent.xmotion.dx, xevent.xmotion.dy);
		}
	    }
	    break;

	    /* Mouse button press? */
	    case ButtonPress: {
		posted = SDL_PrivateMouseButton(SDL_PRESSED, 
					xevent.xbutton.button, 0, 0);
	    }
	    break;

	    /* Mouse button release? */
	    case ButtonRelease: {
		posted = SDL_PrivateMouseButton(SDL_RELEASED, 
					xevent.xbutton.button, 0, 0);
	    }
	    break;

	    /* Key press or release? */
	    case KeyPress:
	    case KeyRelease: {
		SDL_keysym keysym;
		XKeyEvent xkey;

		SDL_NAME(XDGAKeyEventToXKeyEvent)(&xevent.xkey, &xkey);
		posted = SDL_PrivateKeyboard((xevent.type == KeyPress), 
					X11_TranslateKey(DGA_Display,
							 &xkey, xkey.keycode,
							 &keysym));
	    }
	    break;

	}
	return(posted);
}

static int X11_SetGammaNoLock(_THIS, float red, float green, float blue)
{
#if SDL_VIDEO_DRIVER_X11_VIDMODE
    if (use_vidmode >= 200) {
        SDL_NAME(XF86VidModeGamma) gamma;
        Bool succeeded;

	/* Clamp the gamma values */
	if ( red < MIN_GAMMA ) {
		gamma.red = MIN_GAMMA;
	} else
	if ( red > MAX_GAMMA ) {
		gamma.red = MAX_GAMMA;
	} else {
        	gamma.red = red;
	}
	if ( green < MIN_GAMMA ) {
		gamma.green = MIN_GAMMA;
	} else
	if ( green > MAX_GAMMA ) {
		gamma.green = MAX_GAMMA;
	} else {
        	gamma.green = green;
	}
	if ( blue < MIN_GAMMA ) {
		gamma.blue = MIN_GAMMA;
	} else
	if ( blue > MAX_GAMMA ) {
		gamma.blue = MAX_GAMMA;
	} else {
        	gamma.blue = blue;
	}
        if ( SDL_GetAppState() & SDL_APPACTIVE ) {
            succeeded = SDL_NAME(XF86VidModeSetGamma)(SDL_Display, SDL_Screen, &gamma);
            XSync(SDL_Display, False);
        } else {
            gamma_saved[0] = gamma.red;
            gamma_saved[1] = gamma.green;
            gamma_saved[2] = gamma.blue;
            succeeded = True;
        }
        if ( succeeded ) {
            ++gamma_changed;
        }
        return succeeded ? 0 : -1;
    }
#endif
    SDL_SetError("Gamma correction not supported");
    return -1;
}

static void PULSE_WaitAudio(_THIS)
{
	int size;
	while(1) {
		if (SDL_NAME(pa_context_get_state)(context) != PA_CONTEXT_READY ||
		    SDL_NAME(pa_stream_get_state)(stream) != PA_STREAM_READY ||
		    SDL_NAME(pa_mainloop_iterate)(mainloop, 1, NULL) < 0) {
			this->enabled = 0;
			return;
		}
		size = SDL_NAME(pa_stream_writable_size)(stream);
		if (size >= mixlen)
			return;
	}
}

Bool SDL_NAME(XF86DGAGetVideoLL)(
    Display* dpy,
    int screen,
    int *offset,
    int *width, 
    int *bank_size, 
    int *ram_size
){
    XExtDisplayInfo *info = SDL_NAME(xdga_find_display) (dpy);
    xXF86DGAGetVideoLLReply rep;
    xXF86DGAGetVideoLLReq *req;

    XF86DGACheckExtension (dpy, info, False);

    LockDisplay(dpy);
    GetReq(XF86DGAGetVideoLL, req);
    req->reqType = info->codes->major_opcode;
    req->dgaReqType = X_XF86DGAGetVideoLL;
    req->screen = screen;
    if (!_XReply(dpy, (xReply *)&rep, 0, xFalse)) {
	UnlockDisplay(dpy);
	SyncHandle();
	return False;
    }

    *offset = /*(char *)*/rep.offset;
    *width = rep.width;
    *bank_size = rep.bank_size;
    *ram_size = rep.ram_size;
	
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

static int X11_GetGammaNoLock(_THIS, float *red, float *green, float *blue)
{
#ifdef XFREE86_VMGAMMA
    if (use_vidmode >= 200) {
        SDL_NAME(XF86VidModeGamma) gamma;
        if (SDL_NAME(XF86VidModeGetGamma)(SDL_Display, SDL_Screen, &gamma)) {
            *red   = gamma.red;
            *green = gamma.green;
            *blue  = gamma.blue;
            return 0;
        }
        return -1;
    }
#endif
    return -1;
}

static int
SDL_FS_Init(SDL_AudioDriverImpl * impl)
{
    if (LoadFusionSoundLibrary() < 0) {
        return 0;
    } else {
        DirectResult ret;

        ret = SDL_NAME(FusionSoundInit) (NULL, NULL);
        if (ret) {
            UnloadFusionSoundLibrary();
            SDL_SetError
                ("FusionSound: SDL_FS_init failed (FusionSoundInit: %d)",
                 ret);
            return 0;
        }
    }

    /* Set the function pointers */
    impl->OpenDevice = SDL_FS_OpenDevice;
    impl->PlayDevice = SDL_FS_PlayDevice;
    impl->WaitDevice = SDL_FS_WaitDevice;
    impl->GetDeviceBuf = SDL_FS_GetDeviceBuf;
    impl->CloseDevice = SDL_FS_CloseDevice;
    impl->WaitDone = SDL_FS_WaitDone;
    impl->Deinitialize = SDL_FS_Deinitialize;
    impl->OnlyHasDefaultOutputDevice = 1;

    return 1;   /* this audio target is available. */
}