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dri: Drop unused driCalculateSwapUsage

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This commit is contained in:
Kristian Høgsberg 2011-10-28 15:25:09 -04:00
parent 8e6c22136f
commit 24002daf01
2 changed files with 0 additions and 67 deletions
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63
src/mesa/drivers/dri/common/dri_util.c
View file

@ -545,69 +545,6 @@ const __DRI2configQueryExtension dri2ConfigQueryExtension = {
dri2ConfigQueryf,
};
/**
* Calculate amount of swap interval used between GLX buffer swaps.
*
* The usage value, on the range [0,max], is the fraction of total swap
* interval time used between GLX buffer swaps is calculated.
*
* \f$p = t_d / (i * t_r)\f$
*
* Where \f$t_d\f$ is the time since the last GLX buffer swap, \f$i\f$ is the
* swap interval (as set by \c glXSwapIntervalSGI), and \f$t_r\f$ time
* required for a single vertical refresh period (as returned by \c
* glXGetMscRateOML).
*
* See the documentation for the GLX_MESA_swap_frame_usage extension for more
* details.
*
* \param dPriv Pointer to the private drawable structure.
* \return If less than a single swap interval time period was required
* between GLX buffer swaps, a number greater than 0 and less than
* 1.0 is returned. If exactly one swap interval time period is
* required, 1.0 is returned, and if more than one is required then
* a number greater than 1.0 will be returned.
*
* \sa glXSwapIntervalSGI glXGetMscRateOML
*
* \todo Instead of caching the \c glXGetMscRateOML function pointer, would it
* be possible to cache the sync rate?
*/
float
driCalculateSwapUsage( __DRIdrawable *dPriv, int64_t last_swap_ust,
int64_t current_ust )
{
int32_t n;
int32_t d;
int interval;
float usage = 1.0;
__DRIscreen *psp = dPriv->driScreenPriv;
if ( (*psp->systemTime->getMSCRate)(dPriv, &n, &d, dPriv->loaderPrivate) ) {
interval = (dPriv->swap_interval != 0) ? dPriv->swap_interval : 1;
/* We want to calculate
* (current_UST - last_swap_UST) / (interval * us_per_refresh). We get
* current_UST by calling __glXGetUST. last_swap_UST is stored in
* dPriv->swap_ust. interval has already been calculated.
*
* The only tricky part is us_per_refresh. us_per_refresh is
* 1000000 / MSC_rate. We know the MSC_rate is n / d. We can flip it
* around and say us_per_refresh = 1000000 * d / n. Since this goes in
* the denominator of the final calculation, we calculate
* (interval * 1000000 * d) and move n into the numerator.
*/
usage = (current_ust - last_swap_ust);
usage *= n;
usage /= (interval * d);
usage /= 1000000.0;
}
return usage;
}
void
dri2InvalidateDrawable(__DRIdrawable *drawable)
{

4
src/mesa/drivers/dri/common/dri_util.h
View file

@ -448,10 +448,6 @@ struct __DRIscreenRec {
void *loaderPrivate;
};
extern float
driCalculateSwapUsage( __DRIdrawable *dPriv,
int64_t last_swap_ust, int64_t current_ust );
extern void
dri2InvalidateDrawable(__DRIdrawable *drawable);