+++ /dev/null
-/* -*- mode: c; c-basic-offset: 3 -*- */
-/*
- * (c) Copyright IBM Corporation 2002
- * 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"),
- * to deal in the Software without restriction, including without limitation
- * on the rights to use, copy, modify, merge, publish, distribute, sub
- * license, and/or sell copies of the Software, and to permit persons to whom
- * the Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice (including the next
- * paragraph) shall be included in all copies or substantial portions of the
- * Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
- * VA LINUX SYSTEM, IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
- * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
- * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
- * USE OR OTHER DEALINGS IN THE SOFTWARE.
- *
- * Authors:
- * Ian Romanick <idr@us.ibm.com>
- */
-
-#include "main/glheader.h"
-#include "xf86drm.h"
-#include "main/mtypes.h"
-#include "main/macros.h"
-#include "main/dd.h"
-#include "vblank.h"
-#include "xmlpool.h"
-
-static unsigned int msc_to_vblank(__DRIdrawable * dPriv, int64_t msc)
-{
- return (unsigned int)(msc - dPriv->msc_base + dPriv->vblank_base);
-}
-
-static int64_t vblank_to_msc(__DRIdrawable * dPriv, unsigned int vblank)
-{
- return (int64_t)(vblank - dPriv->vblank_base + dPriv->msc_base);
-}
-
-
-/****************************************************************************/
-/**
- * Get the current MSC refresh counter.
- *
- * Stores the 64-bit count of vertical refreshes since some (arbitrary)
- * point in time in \c count. Unless the value wraps around, which it
- * may, it will never decrease for a given drawable.
- *
- * \warning This function is called from \c glXGetVideoSyncSGI, which expects
- * a \c count of type \c unsigned (32-bit), and \c glXGetSyncValuesOML, which
- * expects a \c count of type \c int64_t (signed 64-bit). The kernel ioctl
- * currently always returns a \c sequence of type \c unsigned.
- *
- * \param priv Pointer to the DRI screen private struct.
- * \param dPriv Pointer to the DRI drawable private struct
- * \param count Storage to hold MSC counter.
- * \return Zero is returned on success. A negative errno value
- * is returned on failure.
- */
-int driDrawableGetMSC32( __DRIscreen * priv,
- __DRIdrawable * dPriv,
- int64_t * count)
-{
- drmVBlank vbl;
- int ret;
-
- /* Don't wait for anything. Just get the current refresh count. */
-
- vbl.request.type = DRM_VBLANK_RELATIVE;
- vbl.request.sequence = 0;
- if ( dPriv && dPriv->vblFlags & VBLANK_FLAG_SECONDARY )
- vbl.request.type |= DRM_VBLANK_SECONDARY;
-
- ret = drmWaitVBlank( priv->fd, &vbl );
-
- if (dPriv) {
- *count = vblank_to_msc(dPriv, vbl.reply.sequence);
- } else {
- /* Old driver (no knowledge of drawable MSC callback) */
- *count = vbl.reply.sequence;
- }
-
- return ret;
-}
-
-/****************************************************************************/
-/**
- * Wait for a specified refresh count. This implements most of the
- * functionality of \c glXWaitForMscOML from the GLX_OML_sync_control spec.
- * Waits for the \c target_msc refresh. If that has already passed, it
- * waits until \f$(MSC \bmod divisor)\f$ is equal to \c remainder. If
- * \c target_msc is 0, use the behavior of glXWaitVideoSyncSGI(), which
- * omits the initial check against a target MSC value.
- *
- * This function is actually something of a hack. The problem is that, at
- * the time of this writing, none of the existing DRM modules support an
- * ioctl that returns a 64-bit count (at least not on 32-bit platforms).
- * However, this function exists to support a GLX function that requires
- * the use of 64-bit counts. As such, there is a little bit of ugly
- * hackery at the end of this function to make the 32-bit count act like
- * a 64-bit count. There are still some cases where this will break, but
- * I believe it catches the most common cases.
- *
- * The real solution is to provide an ioctl that uses a 64-bit count.
- *
- * \param dpy Pointer to the \c Display.
- * \param priv Pointer to the DRI drawable private.
- * \param target_msc Desired refresh count to wait for. A value of 0
- * means to use the glXWaitVideoSyncSGI() behavior.
- * \param divisor MSC divisor if \c target_msc is already reached.
- * \param remainder Desired MSC remainder if \c target_msc is already
- * reached.
- * \param msc Buffer to hold MSC when done waiting.
- *
- * \return Zero on success or \c GLX_BAD_CONTEXT on failure.
- */
-
-int driWaitForMSC32( __DRIdrawable *priv,
- int64_t target_msc, int64_t divisor, int64_t remainder,
- int64_t * msc )
-{
- drmVBlank vbl;
-
-
- if ( divisor != 0 ) {
- int64_t next = target_msc;
- int64_t r;
- int dont_wait = (target_msc == 0);
-
- do {
- /* dont_wait means we're using the glXWaitVideoSyncSGI() behavior.
- * The first time around, just get the current count and proceed
- * to the test for (MSC % divisor) == remainder.
- */
- vbl.request.type = dont_wait ? DRM_VBLANK_RELATIVE :
- DRM_VBLANK_ABSOLUTE;
- vbl.request.sequence = next ? msc_to_vblank(priv, next) : 0;
- if ( priv->vblFlags & VBLANK_FLAG_SECONDARY )
- vbl.request.type |= DRM_VBLANK_SECONDARY;
-
- if ( drmWaitVBlank( priv->driScreenPriv->fd, &vbl ) != 0 ) {
- /* FIXME: This doesn't seem like the right thing to return here.
- */
- return GLX_BAD_CONTEXT;
- }
-
- *msc = vblank_to_msc(priv, vbl.reply.sequence);
-
- if (!dont_wait && *msc == next)
- break;
- dont_wait = 0;
-
- /* Assuming the wait-done test fails, the next refresh to wait for
- * will be one that satisfies (MSC % divisor) == remainder. The
- * value (MSC - (MSC % divisor) + remainder) is the refresh value
- * closest to the current value that would satisfy the equation.
- * If this refresh has already happened, we add divisor to obtain
- * the next refresh after the current one that will satisfy it.
- */
- r = ((uint64_t)*msc % divisor);
- next = (*msc - r + remainder);
- if (next <= *msc)
- next += divisor;
-
- } while (r != remainder);
- }
- else {
- /* If the \c divisor is zero, just wait until the MSC is greater
- * than or equal to \c target_msc.
- */
-
- vbl.request.type = DRM_VBLANK_ABSOLUTE;
- vbl.request.sequence = target_msc ? msc_to_vblank(priv, target_msc) : 0;
-
- if ( priv->vblFlags & VBLANK_FLAG_SECONDARY )
- vbl.request.type |= DRM_VBLANK_SECONDARY;
-
- if ( drmWaitVBlank( priv->driScreenPriv->fd, &vbl ) != 0 ) {
- /* FIXME: This doesn't seem like the right thing to return here.
- */
- return GLX_BAD_CONTEXT;
- }
- }
-
- *msc = vblank_to_msc(priv, vbl.reply.sequence);
-
- if ( *msc < target_msc ) {
- *msc += 0x0000000100000000LL;
- }
-
- return 0;
-}
-
-
-/****************************************************************************/
-/**
- * Gets a set of default vertical-blank-wait flags based on the internal GLX
- * API version and several configuration options.
- */
-
-GLuint driGetDefaultVBlankFlags( const driOptionCache *optionCache )
-{
- GLuint flags = VBLANK_FLAG_INTERVAL;
- int vblank_mode;
-
-
- if ( driCheckOption( optionCache, "vblank_mode", DRI_ENUM ) )
- vblank_mode = driQueryOptioni( optionCache, "vblank_mode" );
- else
- vblank_mode = DRI_CONF_VBLANK_DEF_INTERVAL_1;
-
- switch (vblank_mode) {
- case DRI_CONF_VBLANK_NEVER:
- flags = 0;
- break;
- case DRI_CONF_VBLANK_DEF_INTERVAL_0:
- break;
- case DRI_CONF_VBLANK_DEF_INTERVAL_1:
- flags |= VBLANK_FLAG_THROTTLE;
- break;
- case DRI_CONF_VBLANK_ALWAYS_SYNC:
- flags |= VBLANK_FLAG_SYNC;
- break;
- }
-
- return flags;
-}
-
-
-/****************************************************************************/
-/**
- * Wrapper to call \c drmWaitVBlank. The main purpose of this function is to
- * wrap the error message logging. The error message should only be logged
- * the first time the \c drmWaitVBlank fails. If \c drmWaitVBlank is
- * successful, \c vbl_seq will be set the sequence value in the reply.
- *
- * \param vbl Pointer to drmVBlank packet describing how to wait.
- * \param vbl_seq Location to store the current refresh counter.
- * \param fd File descriptor use to call into the DRM.
- * \return Zero on success or -1 on failure.
- */
-
-static int do_wait( drmVBlank * vbl, GLuint * vbl_seq, int fd )
-{
- int ret;
-
-
- ret = drmWaitVBlank( fd, vbl );
- if ( ret != 0 ) {
- static GLboolean first_time = GL_TRUE;
-
- if ( first_time ) {
- fprintf(stderr,
- "%s: drmWaitVBlank returned %d, IRQs don't seem to be"
- " working correctly.\nTry adjusting the vblank_mode"
- " configuration parameter.\n", __FUNCTION__, ret);
- first_time = GL_FALSE;
- }
-
- return -1;
- }
-
- *vbl_seq = vbl->reply.sequence;
- return 0;
-}
-
-
-/****************************************************************************/
-/**
- * Returns the default swap interval of the given drawable.
- */
-
-static unsigned
-driGetDefaultVBlankInterval( const __DRIdrawable *priv )
-{
- if ( (priv->vblFlags & (VBLANK_FLAG_THROTTLE | VBLANK_FLAG_SYNC)) != 0 ) {
- return 1;
- }
- else {
- return 0;
- }
-}
-
-
-/****************************************************************************/
-/**
- * Sets the default swap interval when the drawable is first bound to a
- * direct rendering context.
- */
-
-void driDrawableInitVBlank( __DRIdrawable *priv )
-{
- if ( priv->swap_interval == (unsigned)-1 &&
- !( priv->vblFlags & VBLANK_FLAG_NO_IRQ ) ) {
- /* Get current vertical blank sequence */
- drmVBlank vbl;
-
- vbl.request.type = DRM_VBLANK_RELATIVE;
- if ( priv->vblFlags & VBLANK_FLAG_SECONDARY )
- vbl.request.type |= DRM_VBLANK_SECONDARY;
- vbl.request.sequence = 0;
- do_wait( &vbl, &priv->vblSeq, priv->driScreenPriv->fd );
- priv->vblank_base = priv->vblSeq;
-
- priv->swap_interval = driGetDefaultVBlankInterval( priv );
- }
-}
-
-
-/****************************************************************************/
-/**
- * Returns the current swap interval of the given drawable.
- */
-
-unsigned
-driGetVBlankInterval( const __DRIdrawable *priv )
-{
- if ( (priv->vblFlags & VBLANK_FLAG_INTERVAL) != 0 ) {
- /* this must have been initialized when the drawable was first bound
- * to a direct rendering context. */
- assert ( priv->swap_interval != (unsigned)-1 );
-
- return priv->swap_interval;
- }
- else
- return driGetDefaultVBlankInterval( priv );
-}
-
-
-/****************************************************************************/
-/**
- * Returns the current vertical blank sequence number of the given drawable.
- */
-
-void
-driGetCurrentVBlank( __DRIdrawable *priv )
-{
- drmVBlank vbl;
-
- vbl.request.type = DRM_VBLANK_RELATIVE;
- if ( priv->vblFlags & VBLANK_FLAG_SECONDARY ) {
- vbl.request.type |= DRM_VBLANK_SECONDARY;
- }
- vbl.request.sequence = 0;
-
- (void) do_wait( &vbl, &priv->vblSeq, priv->driScreenPriv->fd );
-}
-
-
-/****************************************************************************/
-/**
- * Waits for the vertical blank for use with glXSwapBuffers.
- *
- * \param missed_deadline Set to \c GL_TRUE if the MSC after waiting is later
- * than the "target" based on \c priv->vblFlags. The idea is
- * that if \c missed_deadline is set, then the application is
- * not achieving its desired framerate.
- * \return Zero on success, -1 on error.
- */
-
-int
-driWaitForVBlank( __DRIdrawable *priv, GLboolean * missed_deadline )
-{
- drmVBlank vbl;
- unsigned original_seq;
- unsigned deadline;
- unsigned interval;
- unsigned diff;
-
- *missed_deadline = GL_FALSE;
- if ( (priv->vblFlags & (VBLANK_FLAG_INTERVAL |
- VBLANK_FLAG_THROTTLE |
- VBLANK_FLAG_SYNC)) == 0 ||
- (priv->vblFlags & VBLANK_FLAG_NO_IRQ) != 0 ) {
- return 0;
- }
-
-
- /* VBLANK_FLAG_SYNC means to wait for at least one vertical blank. If
- * that flag is not set, do a fake wait for zero vertical blanking
- * periods so that we can get the current MSC.
- *
- * VBLANK_FLAG_INTERVAL and VBLANK_FLAG_THROTTLE mean to wait for at
- * least one vertical blank since the last wait. Since do_wait modifies
- * priv->vblSeq, we have to save the original value of priv->vblSeq for the
- * VBLANK_FLAG_INTERVAL / VBLANK_FLAG_THROTTLE calculation later.
- */
-
- original_seq = priv->vblSeq;
- interval = driGetVBlankInterval(priv);
- deadline = original_seq + interval;
-
- vbl.request.type = DRM_VBLANK_RELATIVE;
- if ( priv->vblFlags & VBLANK_FLAG_SECONDARY ) {
- vbl.request.type |= DRM_VBLANK_SECONDARY;
- }
- vbl.request.sequence = ((priv->vblFlags & VBLANK_FLAG_SYNC) != 0) ? 1 : 0;
-
- if ( do_wait( & vbl, &priv->vblSeq, priv->driScreenPriv->fd ) != 0 ) {
- return -1;
- }
-
- diff = priv->vblSeq - deadline;
-
- /* No need to wait again if we've already reached the target */
- if (diff <= (1 << 23)) {
- *missed_deadline = (priv->vblFlags & VBLANK_FLAG_SYNC) ? (diff > 0) :
- GL_TRUE;
- return 0;
- }
-
- /* Wait until the target vertical blank. */
- vbl.request.type = DRM_VBLANK_ABSOLUTE;
- if ( priv->vblFlags & VBLANK_FLAG_SECONDARY ) {
- vbl.request.type |= DRM_VBLANK_SECONDARY;
- }
- vbl.request.sequence = deadline;
-
- if ( do_wait( & vbl, &priv->vblSeq, priv->driScreenPriv->fd ) != 0 ) {
- return -1;
- }
-
- diff = priv->vblSeq - deadline;
- *missed_deadline = diff > 0 && diff <= (1 << 23);
-
- return 0;
-}
+++ /dev/null
-/* -*- mode: c; c-basic-offset: 3 -*- */
-/*
- * (c) Copyright IBM Corporation 2002
- * 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"),
- * to deal in the Software without restriction, including without limitation
- * on the rights to use, copy, modify, merge, publish, distribute, sub
- * license, and/or sell copies of the Software, and to permit persons to whom
- * the Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice (including the next
- * paragraph) shall be included in all copies or substantial portions of the
- * Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
- * VA LINUX SYSTEM, IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
- * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
- * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
- * USE OR OTHER DEALINGS IN THE SOFTWARE.
- *
- * Authors:
- * Ian Romanick <idr@us.ibm.com>
- */
-
-#ifndef DRI_VBLANK_H
-#define DRI_VBLANK_H
-
-#include "main/context.h"
-#include "dri_util.h"
-#include "xmlconfig.h"
-
-#define VBLANK_FLAG_INTERVAL (1U << 0) /* Respect the swap_interval setting
- */
-#define VBLANK_FLAG_THROTTLE (1U << 1) /* Wait 1 refresh since last call.
- */
-#define VBLANK_FLAG_SYNC (1U << 2) /* Sync to the next refresh.
- */
-#define VBLANK_FLAG_NO_IRQ (1U << 7) /* DRM has no IRQ to wait on.
- */
-#define VBLANK_FLAG_SECONDARY (1U << 8) /* Wait for secondary vblank.
- */
-
-extern int driGetMSC32( __DRIscreen * priv, int64_t * count );
-extern int driDrawableGetMSC32( __DRIscreen * priv,
- __DRIdrawable * drawablePrivate,
- int64_t * count);
-extern int driWaitForMSC32( __DRIdrawable *priv,
- int64_t target_msc, int64_t divisor, int64_t remainder, int64_t * msc );
-extern GLuint driGetDefaultVBlankFlags( const driOptionCache *optionCache );
-extern void driDrawableInitVBlank ( __DRIdrawable *priv );
-extern unsigned driGetVBlankInterval( const __DRIdrawable *priv );
-extern void driGetCurrentVBlank( __DRIdrawable *priv );
-extern int driWaitForVBlank( __DRIdrawable *priv,
- GLboolean * missed_deadline );
-
-#undef usleep
-#include <unistd.h> /* for usleep() */
-#include <sched.h> /* for sched_yield() */
-
-#define DO_USLEEP(nr) \
- do { \
- if (0) fprintf(stderr, "%s: usleep for %u\n", __FUNCTION__, nr ); \
- if (1) usleep( nr ); \
- sched_yield(); \
- } while( 0 )
-
-#endif /* DRI_VBLANK_H */
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