/* $XFree86: xc/lib/GL/mesa/src/drv/r128/r128_lock.h,v 1.1 2000/06/17 00:03:06 martin Exp $ */
/**************************************************************************

Copyright 1999, 2000 ATI Technologies Inc. and Precision Insight, Inc.,
                                               Cedar Park, Texas.
All Rights Reserved.

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
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The above copyright notice and this permission notice (including the next
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**************************************************************************/

/*
 * Authors:
 *   Kevin E. Martin <kevin@precisioninsight.com>
 *
 */

#ifndef _R128_LOCK_H_
#define _R128_LOCK_H_

#ifdef GLX_DIRECT_RENDERING

/* Turn DEBUG_LOCKING on to find locking conflicts (see r128_init.h) */
#if DEBUG_LOCKING
extern char *prevLockFile;
extern int   prevLockLine;

#define DEBUG_LOCK()                                                    \
    do {                                                                \
	prevLockFile = (__FILE__);                                      \
	prevLockLine = (__LINE__);                                      \
    } while (0)

#define DEBUG_RESET()                                                   \
    do {                                                                \
	prevLockFile = 0;                                               \
	prevLockLine = 0;                                               \
    } while (0)

#define DEBUG_CHECK_LOCK()                                              \
    do {                                                                \
	if (prevLockFile) {                                             \
	    fprintf(stderr,                                             \
		    "LOCK SET!\n\tPrevious %s:%d\n\tCurrent: %s:%d\n",  \
		    prevLockFile, prevLockLine, __FILE__, __LINE__);    \
	    exit(1);                                                    \
	}                                                               \
    } while (0)

#else

#define DEBUG_LOCK()
#define DEBUG_RESET()
#define DEBUG_CHECK_LOCK()

#endif

/*
 * !!! We may want to separate locks from locks with validation.  This
 * could be used to improve performance for those things commands that
 * do not do any drawing !!!
 */

/* Lock the hardware using the current context */
#define LOCK_HARDWARE(CC)                                               \
    do {                                                                \
	char                  __ret = 0;                                \
	__DRIcontextPrivate  *cPriv = CC->driContext;                   \
	__DRIscreenPrivate   *sPriv = CC->r128Screen->driScreen;        \
                                                                        \
	DEBUG_CHECK_LOCK();                                             \
	DRM_CAS(&sPriv->pSAREA->lock, cPriv->hHWContext,                \
		DRM_LOCK_HELD|cPriv->hHWContext, __ret);                \
	if (__ret) {                                                    \
	    /* We lost the context, so we need to request the lock from \
               the kernel and update our state. */                      \
	    drmGetLock(sPriv->fd, cPriv->hHWContext, 0);                \
	    XMesaUpdateState(cPriv);                                    \
	}                                                               \
	DEBUG_LOCK();                                                   \
    } while (0)

/* Unlock the hardware using the current context */
#define UNLOCK_HARDWARE(CC)                                             \
    do {                                                                \
	__DRIcontextPrivate  *cPriv = CC->driContext;                   \
	__DRIscreenPrivate   *sPriv = CC->r128Screen->driScreen;        \
                                                                        \
	DRM_UNLOCK(sPriv->fd, &sPriv->pSAREA->lock, cPriv->hHWContext); \
	DEBUG_RESET();                                                  \
    } while (0)

/*
 * This pair of macros makes a loop over the drawing operations, so it
 * is not self contained and does not have the nice single statement
 * semantics of most macros.
 */
#define BEGIN_CLIP_LOOP(CC)                                             \
    do {                                                                \
	__DRIdrawablePrivate *_dPriv = CC->driDrawable;                 \
	XF86DRIClipRectPtr    _pc = _dPriv->pClipRects;                 \
	int                   _nc, _sc;                                 \
                                                                        \
	for (_nc = _dPriv->numClipRects; _nc > 0; _nc -= 3, _pc += 3) { \
	    _sc = (_nc <= 3) ? _nc : 3;                                 \
	    r128SetClipRects(CC, _pc, _sc)

/* FIXME: This should be a function call to turn off aux clipping */
#define END_CLIP_LOOP(CC)                                               \
	    R128CCE0(R128_CCE_PACKET0, R128_AUX_SC_CNTL, 0);            \
	    R128CCE(0x00000000);                                        \
	    R128CCE_SUBMIT_PACKET();                                    \
	}                                                               \
    } while (0)

#endif
#endif /* _R128_LOCK_H_ */