/**************************************************************************
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*
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* Copyright 2009 VMware, Inc.
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* Copyright 2012 Marek Olšák <maraeo@gmail.com>
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/* A simple allocator that suballocates memory from a large buffer. */
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#include "pipe/p_defines.h"
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#include "util/u_inlines.h"
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#include "pipe/p_context.h"
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#include "util/u_memory.h"
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#include "util/u_math.h"
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#include "u_suballoc.h"
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struct u_suballocator {
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struct pipe_context *pipe;
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unsigned size; /* Size of the whole buffer, in bytes. */
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unsigned bind; /* Bitmask of PIPE_BIND_* flags. */
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enum pipe_resource_usage usage;
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unsigned flags; /* bitmask of PIPE_RESOURCE_FLAG_x */
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boolean zero_buffer_memory; /* If the buffer contents should be zeroed. */
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struct pipe_resource *buffer; /* The buffer we suballocate from. */
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unsigned offset; /* Aligned offset pointing at the first unused byte. */
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};
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/**
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* Create a suballocator.
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*
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* \param flags bitmask of PIPE_RESOURCE_FLAG_x
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* \param zero_buffer_memory determines whether the buffer contents should be
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* cleared to 0 after the allocation.
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*
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*/
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struct u_suballocator *
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u_suballocator_create(struct pipe_context *pipe, unsigned size, unsigned bind,
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enum pipe_resource_usage usage, unsigned flags,
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boolean zero_buffer_memory)
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{
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struct u_suballocator *allocator = CALLOC_STRUCT(u_suballocator);
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if (!allocator)
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return NULL;
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allocator->pipe = pipe;
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allocator->size = size;
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allocator->bind = bind;
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allocator->usage = usage;
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allocator->flags = flags;
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allocator->zero_buffer_memory = zero_buffer_memory;
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return allocator;
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}
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void
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u_suballocator_destroy(struct u_suballocator *allocator)
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{
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pipe_resource_reference(&allocator->buffer, NULL);
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FREE(allocator);
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}
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void
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u_suballocator_alloc(struct u_suballocator *allocator, unsigned size,
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unsigned alignment, unsigned *out_offset,
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struct pipe_resource **outbuf)
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{
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allocator->offset = align(allocator->offset, alignment);
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/* Don't allow allocations larger than the buffer size. */
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if (size > allocator->size)
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goto fail;
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/* Make sure we have enough space in the buffer. */
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if (!allocator->buffer ||
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allocator->offset + size > allocator->size) {
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/* Allocate a new buffer. */
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pipe_resource_reference(&allocator->buffer, NULL);
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allocator->offset = 0;
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struct pipe_resource templ;
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memset(&templ, 0, sizeof(templ));
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templ.target = PIPE_BUFFER;
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templ.format = PIPE_FORMAT_R8_UNORM;
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templ.bind = allocator->bind;
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templ.usage = allocator->usage;
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templ.flags = allocator->flags;
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templ.width0 = allocator->size;
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templ.height0 = 1;
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templ.depth0 = 1;
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templ.array_size = 1;
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struct pipe_screen *screen = allocator->pipe->screen;
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allocator->buffer = screen->resource_create(screen, &templ);
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if (!allocator->buffer)
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goto fail;
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/* Clear the memory if needed. */
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if (allocator->zero_buffer_memory) {
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struct pipe_context *pipe = allocator->pipe;
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if (pipe->clear_buffer) {
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unsigned clear_value = 0;
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pipe->clear_buffer(pipe, allocator->buffer, 0, allocator->size,
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&clear_value, 4);
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} else {
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struct pipe_transfer *transfer = NULL;
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void *ptr = pipe_buffer_map(pipe, allocator->buffer,
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PIPE_TRANSFER_WRITE, &transfer);
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memset(ptr, 0, allocator->size);
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pipe_buffer_unmap(pipe, transfer);
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}
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}
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}
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assert(allocator->offset % alignment == 0);
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assert(allocator->offset < allocator->buffer->width0);
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assert(allocator->offset + size <= allocator->buffer->width0);
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/* Return the buffer. */
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*out_offset = allocator->offset;
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pipe_resource_reference(outbuf, allocator->buffer);
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allocator->offset += size;
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return;
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fail:
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pipe_resource_reference(outbuf, NULL);
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}
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