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/**************************************************************************
*
* Copyright 2009 VMware, Inc.
* Copyright 2012 Marek Olšák <maraeo@gmail.com>
* 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 THE AUTHORS 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.
*
**************************************************************************/
/* A simple allocator that suballocates memory from a large buffer. */
#include "pipe/p_defines.h"
#include "util/u_inlines.h"
#include "pipe/p_context.h"
#include "util/u_memory.h"
#include "util/u_math.h"
#include "u_suballoc.h"
struct u_suballocator {
struct pipe_context *pipe;
unsigned size; /* Size of the whole buffer, in bytes. */
unsigned bind; /* Bitmask of PIPE_BIND_* flags. */
enum pipe_resource_usage usage;
boolean zero_buffer_memory; /* If the buffer contents should be zeroed. */
struct pipe_resource *buffer; /* The buffer we suballocate from. */
unsigned offset; /* Aligned offset pointing at the first unused byte. */
};
/**
* Create a suballocator.
*
* \p zero_buffer_memory determines whether the buffer contents should be
* cleared to 0 after the allocation.
*/
struct u_suballocator *
u_suballocator_create(struct pipe_context *pipe, unsigned size, unsigned bind,
enum pipe_resource_usage usage,
boolean zero_buffer_memory)
{
struct u_suballocator *allocator = CALLOC_STRUCT(u_suballocator);
if (!allocator)
return NULL;
allocator->pipe = pipe;
allocator->size = size;
allocator->bind = bind;
allocator->usage = usage;
allocator->zero_buffer_memory = zero_buffer_memory;
return allocator;
}
void
u_suballocator_destroy(struct u_suballocator *allocator)
{
pipe_resource_reference(&allocator->buffer, NULL);
FREE(allocator);
}
void
u_suballocator_alloc(struct u_suballocator *allocator, unsigned size,
unsigned alignment, unsigned *out_offset,
struct pipe_resource **outbuf)
{
allocator->offset = align(allocator->offset, alignment);
/* Don't allow allocations larger than the buffer size. */
if (size > allocator->size)
goto fail;
/* Make sure we have enough space in the buffer. */
if (!allocator->buffer ||
allocator->offset + size > allocator->size) {
/* Allocate a new buffer. */
pipe_resource_reference(&allocator->buffer, NULL);
allocator->offset = 0;
allocator->buffer =
pipe_buffer_create(allocator->pipe->screen, allocator->bind,
allocator->usage, allocator->size);
if (!allocator->buffer)
goto fail;
/* Clear the memory if needed. */
if (allocator->zero_buffer_memory) {
struct pipe_transfer *transfer = NULL;
void *ptr;
ptr = pipe_buffer_map(allocator->pipe, allocator->buffer,
PIPE_TRANSFER_WRITE, &transfer);
memset(ptr, 0, allocator->size);
pipe_buffer_unmap(allocator->pipe, transfer);
}
}
assert(allocator->offset % alignment == 0);
assert(allocator->offset < allocator->buffer->width0);
assert(allocator->offset + size <= allocator->buffer->width0);
/* Return the buffer. */
*out_offset = allocator->offset;
pipe_resource_reference(outbuf, allocator->buffer);
allocator->offset += size;
return;
fail:
pipe_resource_reference(outbuf, NULL);
}
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