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/**************************************************************************
*
* Copyright 2009 VMware, Inc.
* 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 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 VMWARE AND/OR ITS 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.
*
**************************************************************************/
#include "pipe/p_screen.h"
#include "util/u_memory.h"
#include "util/u_inlines.h"
#include "lp_debug.h"
#include "lp_fence.h"
/**
* Create a new fence object.
*
* The rank will be the number of bins in the scene. Whenever a rendering
* thread hits a fence command, it'll increment the fence counter. When
* the counter == the rank, the fence is finished.
*
* \param rank the expected finished value of the fence counter.
*/
struct lp_fence *
lp_fence_create(unsigned rank)
{
struct lp_fence *fence = CALLOC_STRUCT(lp_fence);
pipe_reference_init(&fence->reference, 1);
pipe_mutex_init(fence->mutex);
pipe_condvar_init(fence->signalled);
fence->rank = rank;
return fence;
}
/** Destroy a fence. Called when refcount hits zero. */
static void
lp_fence_destroy(struct lp_fence *fence)
{
pipe_mutex_destroy(fence->mutex);
pipe_condvar_destroy(fence->signalled);
FREE(fence);
}
/**
* For reference counting.
* This is a Gallium API function.
*/
static void
llvmpipe_fence_reference(struct pipe_screen *screen,
struct pipe_fence_handle **ptr,
struct pipe_fence_handle *fence)
{
struct lp_fence *old = (struct lp_fence *) *ptr;
struct lp_fence *f = (struct lp_fence *) fence;
if (pipe_reference(&old->reference, &f->reference)) {
lp_fence_destroy(old);
}
}
/**
* Has the fence been executed/finished?
* This is a Gallium API function.
*/
static int
llvmpipe_fence_signalled(struct pipe_screen *screen,
struct pipe_fence_handle *fence,
unsigned flag)
{
struct lp_fence *f = (struct lp_fence *) fence;
return f->count == f->rank;
}
/**
* Wait for the fence to finish.
* This is a Gallium API function.
*/
static int
llvmpipe_fence_finish(struct pipe_screen *screen,
struct pipe_fence_handle *fence_handle,
unsigned flag)
{
struct lp_fence *fence = (struct lp_fence *) fence_handle;
pipe_mutex_lock(fence->mutex);
while (fence->count < fence->rank) {
pipe_condvar_wait(fence->signalled, fence->mutex);
}
pipe_mutex_unlock(fence->mutex);
return 0;
}
/**
* Called by the rendering threads to increment the fence counter.
* When the counter == the rank, the fence is finished.
*/
void
lp_fence_signal(struct lp_fence *fence)
{
pipe_mutex_lock(fence->mutex);
fence->count++;
assert(fence->count <= fence->rank);
LP_DBG(DEBUG_RAST, "%s count=%u rank=%u\n", __FUNCTION__,
fence->count, fence->rank);
pipe_condvar_signal(fence->signalled);
pipe_mutex_unlock(fence->mutex);
}
void
llvmpipe_init_screen_fence_funcs(struct pipe_screen *screen)
{
screen->fence_reference = llvmpipe_fence_reference;
screen->fence_signalled = llvmpipe_fence_signalled;
screen->fence_finish = llvmpipe_fence_finish;
}
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