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gallium: Reusable pipe buffer library.

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This is an optional library that winsys drivers can use to simplify memory
management, and help meet the winsys interface requirements.
This commit is contained in:
José Fonseca
2007-11-23 17:22:54 +00:00
parent 708582f6d5
commit b478362251
16 changed files with 2266 additions and 3 deletions
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340
src/mesa/pipe/pipebuffer/pb_buffer_fenced.c Normal file
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/**************************************************************************
*
* Copyright 2007 Tungsten Graphics, 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"), 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 TUNGSTEN GRAPHICS 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.
*
**************************************************************************/
/**
* \file
* Implementation of fenced buffers.
*
* \author Jos<6F> Fonseca <jrfonseca-at-tungstengraphics-dot-com>
* \author Thomas Hellstr<74>m <thomas-at-tungstengraphics-dot-com>
*/
#include <assert.h>
#include <stdlib.h>
#include <unistd.h>
#include "main/imports.h"
#include "glapi/glthread.h"
#include "linked_list.h"
#include "p_winsys.h"
#include "pb_buffer.h"
#include "pb_buffer_fenced.h"
/**
* Convenience macro (type safe).
*/
#define SUPER(__derived) (&(__derived)->base)
struct fenced_buffer_list
{
_glthread_Mutex mutex;
struct pipe_winsys *winsys;
size_t numDelayed;
size_t checkDelayed;
struct list_head delayed;
};
/**
* Wrapper around a pipe buffer which adds fencing and reference counting.
*/
struct fenced_buffer
{
struct pipe_buffer base;
struct pipe_buffer *buffer;
unsigned refcount;
struct pipe_fence_handle *fence;
struct list_head head;
struct fenced_buffer_list *list;
};
static inline struct fenced_buffer *
fenced_buffer(struct pipe_buffer *buf)
{
assert(buf);
assert(buf->vtbl == &fenced_buffer_vtbl);
return (struct fenced_buffer *)buf;
}
static void
_fenced_buffer_destroy(struct fenced_buffer *fenced_buf)
{
buffer_release(fenced_buf->buffer);
free(fenced_buf);
}
static void
_fenced_buffer_list_check_free(struct fenced_buffer_list *fenced_list,
int wait)
{
struct pipe_winsys *winsys = fenced_list->winsys;
struct fenced_buffer *fenced_buf;
struct list_head *list, *prev;
int signaled = -1;
int i;
list = fenced_list->delayed.next;
if (fenced_list->numDelayed > 3) {
for (i = 0; i < fenced_list->numDelayed; i += 3) {
list = list->next;
}
}
prev = list->prev;
for (; list != &fenced_list->delayed; list = prev, prev = list->prev) {
fenced_buf = LIST_ENTRY(struct fenced_buffer, list, head);
if (signaled != 0) {
if (wait) {
signaled = winsys->fence_finish(winsys, fenced_buf->fence, 0);
}
else {
signaled = winsys->fence_signalled(winsys, fenced_buf->fence, 0);
}
}
if (signaled != 0)
/* XXX: we are assuming that buffers are freed in the same order they
* are fenced which may not always be true...
*/
break;
winsys->fence_reference(winsys, &fenced_buf->fence, NULL);
LIST_DEL(list);
fenced_list->numDelayed--;
_fenced_buffer_destroy(fenced_buf);
}
}
static void
fenced_buffer_reference(struct pipe_buffer *buf)
{
struct fenced_buffer *fenced_buf = fenced_buffer(buf);
struct fenced_buffer_list *fenced_list = fenced_buf->list;
_glthread_LOCK_MUTEX(fenced_list->mutex);
fenced_buf->refcount++;
_glthread_UNLOCK_MUTEX(fenced_list->mutex);
}
static void
fenced_buffer_release(struct pipe_buffer *buf)
{
struct fenced_buffer *fenced_buf = fenced_buffer(buf);
struct fenced_buffer_list *fenced_list = fenced_buf->list;
_glthread_LOCK_MUTEX(fenced_list->mutex);
fenced_buf->refcount--;
if(!fenced_buf->refcount) {
if (fenced_buf->fence) {
LIST_ADDTAIL(&fenced_buf->head, &fenced_list->delayed);
fenced_list->numDelayed++;
}
else {
_fenced_buffer_destroy(fenced_buf);
}
if ((fenced_list->numDelayed % fenced_list->checkDelayed) == 0)
_fenced_buffer_list_check_free(fenced_list, 0);
}
_glthread_UNLOCK_MUTEX(fenced_list->mutex);
}
static void *
fenced_buffer_map(struct pipe_buffer *buf,
unsigned flags)
{
struct fenced_buffer *fenced_buf = fenced_buffer(buf);
return buffer_map(fenced_buf->buffer, flags);
}
static void
fenced_buffer_unmap(struct pipe_buffer *buf)
{
struct fenced_buffer *fenced_buf = fenced_buffer(buf);
buffer_unmap(fenced_buf->buffer);
}
static void
fenced_buffer_get_base_buffer(struct pipe_buffer *buf,
struct pipe_buffer **base_buf,
unsigned *offset)
{
struct fenced_buffer *fenced_buf = fenced_buffer(buf);
buffer_get_base_buffer(fenced_buf->buffer, base_buf, offset);
}
const struct pipe_buffer_vtbl
fenced_buffer_vtbl = {
fenced_buffer_reference,
fenced_buffer_release,
fenced_buffer_map,
fenced_buffer_unmap,
fenced_buffer_get_base_buffer
};
struct pipe_buffer *
fenced_buffer_create(struct fenced_buffer_list *fenced_list,
struct pipe_buffer *buffer)
{
struct fenced_buffer *buf;
buf = (struct fenced_buffer *)calloc(1, sizeof(struct fenced_buffer));
if(!buf)
return NULL;
buf->base.vtbl = &fenced_buffer_vtbl;
buf->buffer = buffer;
buf->refcount = 1;
buf->list = fenced_list;
return &buf->base;
}
void
buffer_fence(struct pipe_buffer *buf,
struct pipe_fence_handle *fence)
{
if(buf->vtbl == &fenced_buffer_vtbl) {
struct fenced_buffer *fenced_buf = fenced_buffer(buf);
struct fenced_buffer_list *fenced_list = fenced_buf->list;
struct pipe_winsys *winsys = fenced_list->winsys;
_glthread_LOCK_MUTEX(fenced_list->mutex);
winsys->fence_reference(winsys, &fenced_buf->fence, fence);
_glthread_UNLOCK_MUTEX(fenced_list->mutex);
}
else
assert(0);
}
void
buffer_unfence(struct pipe_buffer *buf)
{
buffer_fence(buf, NULL);
}
int
buffer_finish(struct pipe_buffer *buf,
unsigned flag)
{
if(buf->vtbl == &fenced_buffer_vtbl) {
struct fenced_buffer *fenced_buf = fenced_buffer(buf);
if(fenced_buf->fence) {
struct fenced_buffer_list *fenced_list = fenced_buf->list;
struct pipe_winsys *winsys = fenced_list->winsys;
return winsys->fence_finish(winsys, fenced_buf->fence, flag);
}
}
return 0;
}
struct fenced_buffer_list *
fenced_buffer_list_create(struct pipe_winsys *winsys)
{
struct fenced_buffer_list *fenced_list;
fenced_list = (struct fenced_buffer_list *)calloc(1, sizeof(*fenced_list));
if (!fenced_list)
return NULL;
fenced_list->winsys = winsys;
LIST_INITHEAD(&fenced_list->delayed);
fenced_list->numDelayed = 0;
/* TODO: don't hard code this */
fenced_list->checkDelayed = 5;
_glthread_INIT_MUTEX(fenced_list->mutex);
return fenced_list;
}
void
fenced_buffer_list_check_free(struct fenced_buffer_list *fenced_list,
int wait)
{
_glthread_LOCK_MUTEX(fenced_list->mutex);
_fenced_buffer_list_check_free(fenced_list, wait);
_glthread_UNLOCK_MUTEX(fenced_list->mutex);
}
void
fenced_buffer_list_destroy(struct fenced_buffer_list *fenced_list)
{
_glthread_LOCK_MUTEX(fenced_list->mutex);
/* Wait on outstanding fences */
while (fenced_list->numDelayed) {
_glthread_UNLOCK_MUTEX(fenced_list->mutex);
sched_yield();
_fenced_buffer_list_check_free(fenced_list, GL_TRUE);
_glthread_LOCK_MUTEX(fenced_list->mutex);
}
_glthread_UNLOCK_MUTEX(fenced_list->mutex);
free(fenced_list);
}