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view src/audio/SDL_sysaudio.h @ 1544:ab1e4c41ab71

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Fixed bug #33 Mike Frysinger wrote: > with libsdl-1.2.9, some games (like bomberclone) started > segfaulting in Gentoo [...snip...] > the last change in the last hunk: [...snip...] > if i change the statement to read: > (table[which].blit_features & GetBlitFeatures()) == GetBlitFeatures() > bomberclone no longer segfaults on my box Alex Volkov wrote: > The test "(table[which].blit_features & GetBlitFeatures()) == > table[which].blit_features)" is correct, and the previous > "(table[which].cpu_mmx == SDL_HasMMX())" was actually broken. I think there is potentially a slightly different cause of the above problem. During the introduction of the Altivec code, the blit_table struct field 'alpha' got changed from a straightforward enum to a bitmask, which makes perfect sense by itself. However, now the table driven blitter selection code in SDL_CalculateBlitN() can choose the wrong blitters when searching for a NO_ALPHA blitter because of the following code: int a_need = 0; ... (a_need & table[which].alpha) == a_need && When searching through the normal_blit_2[] table, a SET_ALPHA blitter (like Blit_RGB565_ARGB8888) can now be selected instead of a NO_ALPHA one, causing alpha channel bits to appear in a non-alpha destination surface. I suppose this could theoretically be an indirect cause of the segfault mentioned above. I *think* this can be fixed by changing to int a_need = NO_ALPHA;
author Sam Lantinga <slouken@libsdl.org>
date Wed, 15 Mar 2006 15:47:49 +0000
parents 30f189cdd82b
children 12b6d331d82a
line wrap: on
line source

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2006 Sam Lantinga

    This library is SDL_free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

#ifndef _SDL_sysaudio_h
#define _SDL_sysaudio_h

#include "SDL_mutex.h"
#include "SDL_thread.h"

/* The SDL audio driver */
typedef struct SDL_AudioDevice SDL_AudioDevice;

/* Define the SDL audio driver structure */
#define _THIS	SDL_AudioDevice *_this
#ifndef _STATUS
#define _STATUS	SDL_status *status
#endif
struct SDL_AudioDevice {
	/* * * */
	/* The name of this audio driver */
	const char *name;

	/* * * */
	/* The description of this audio driver */
	const char *desc;

	/* * * */
	/* Public driver functions */
	int  (*OpenAudio)(_THIS, SDL_AudioSpec *spec);
	void (*ThreadInit)(_THIS);	/* Called by audio thread at start */
	void (*WaitAudio)(_THIS);
	void (*PlayAudio)(_THIS);
	Uint8 *(*GetAudioBuf)(_THIS);
	void (*WaitDone)(_THIS);
	void (*CloseAudio)(_THIS);

	/* * * */
	/* Lock / Unlock functions added for the Mac port */
	void (*LockAudio)(_THIS);
	void (*UnlockAudio)(_THIS);

	/* * * */
	/* Data common to all devices */

	/* The current audio specification (shared with audio thread) */
	SDL_AudioSpec spec;

	/* An audio conversion block for audio format emulation */
	SDL_AudioCVT convert;

	/* Current state flags */
	int enabled;
	int paused;
	int opened;

	/* Fake audio buffer for when the audio hardware is busy */
	Uint8 *fake_stream;

	/* A semaphore for locking the mixing buffers */
	SDL_mutex *mixer_lock;

	/* A thread to feed the audio device */
	SDL_Thread *thread;
	Uint32 threadid;

	/* * * */
	/* Data private to this driver */
	struct SDL_PrivateAudioData *hidden;

	/* * * */
	/* The function used to dispose of this structure */
	void (*free)(_THIS);
};
#undef _THIS

typedef struct AudioBootStrap {
	const char *name;
	const char *desc;
	int (*available)(void);
	SDL_AudioDevice *(*create)(int devindex);
} AudioBootStrap;

#if SDL_AUDIO_DRIVER_OPENBSD
extern AudioBootStrap OPENBSD_AUDIO_bootstrap;
#endif
#if SDL_AUDIO_DRIVER_OSS
extern AudioBootStrap DSP_bootstrap;
extern AudioBootStrap DMA_bootstrap;
#endif
#if SDL_AUDIO_DRIVER_ALSA
extern AudioBootStrap ALSA_bootstrap;
#endif
#if SDL_AUDIO_DRIVER_QNXNTO
extern AudioBootStrap QNXNTOAUDIO_bootstrap;
#endif
#if SDL_AUDIO_DRIVER_SUNAUDIO
extern AudioBootStrap SUNAUDIO_bootstrap;
#endif
#if SDL_AUDIO_DRIVER_DMEDIA
extern AudioBootStrap DMEDIA_bootstrap;
#endif
#if SDL_AUDIO_DRIVER_ARTS
extern AudioBootStrap ARTS_bootstrap;
#endif
#if SDL_AUDIO_DRIVER_ESD
extern AudioBootStrap ESD_bootstrap;
#endif
#if SDL_AUDIO_DRIVER_NAS
extern AudioBootStrap NAS_bootstrap;
#endif
#if SDL_AUDIO_DRIVER_DSOUND
extern AudioBootStrap DSOUND_bootstrap;
#endif
#if SDL_AUDIO_DRIVER_WAVEOUT
extern AudioBootStrap WAVEOUT_bootstrap;
#endif
#if SDL_AUDIO_DRIVER_PAUD
extern AudioBootStrap Paud_bootstrap;
#endif
#if SDL_AUDIO_DRIVER_BAUDIO
extern AudioBootStrap BAUDIO_bootstrap;
#endif
#if SDL_AUDIO_DRIVER_COREAUDIO
extern AudioBootStrap COREAUDIO_bootstrap;
#endif
#if SDL_AUDIO_DRIVER_SNDMGR
extern AudioBootStrap SNDMGR_bootstrap;
#endif
#if SDL_AUDIO_DRIVER_AHI
extern AudioBootStrap AHI_bootstrap;
#endif
#if SDL_AUDIO_DRIVER_MINT
extern AudioBootStrap MINTAUDIO_GSXB_bootstrap;
extern AudioBootStrap MINTAUDIO_MCSN_bootstrap;
extern AudioBootStrap MINTAUDIO_STFA_bootstrap;
extern AudioBootStrap MINTAUDIO_XBIOS_bootstrap;
extern AudioBootStrap MINTAUDIO_DMA8_bootstrap;
#endif
#if SDL_AUDIO_DRIVER_DISK
extern AudioBootStrap DISKAUD_bootstrap;
#endif
#if SDL_AUDIO_DRIVER_DUMMY
extern AudioBootStrap DUMMYAUD_bootstrap;
#endif
#if SDL_AUDIO_DRIVER_DC
extern AudioBootStrap DCAUD_bootstrap;
#endif
#if SDL_AUDIO_DRIVER_MMEAUDIO
extern AudioBootStrap MMEAUDIO_bootstrap;
#endif
#if SDL_AUDIO_DRIVER_DART
extern AudioBootStrap DART_bootstrap;
#endif

/* This is the current audio device */
extern SDL_AudioDevice *current_audio;

#endif /* _SDL_sysaudio_h */