/*
* Mesa 3-D graphics library
*
* Copyright (C) 2012-2013 LunarG, Inc.
*
* 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, sublicense,
* 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 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 NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS 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.
*
* Authors:
* Chia-I Wu <olv@lunarg.com>
*/
#ifndef ILO_BUFFER_H
#define ILO_BUFFER_H
#include "intel_winsys.h"
#include "ilo_core.h"
#include "ilo_dev.h"
struct ilo_buffer {
unsigned bo_size;
struct intel_bo *bo;
};
static inline void
ilo_buffer_init(struct ilo_buffer *buf, const struct ilo_dev *dev,
unsigned size, uint32_t bind, uint32_t flags)
{
buf->bo_size = size;
/*
* From the Sandy Bridge PRM, volume 1 part 1, page 118:
*
* "For buffers, which have no inherent "height," padding requirements
* are different. A buffer must be padded to the next multiple of 256
* array elements, with an additional 16 bytes added beyond that to
* account for the L1 cache line."
*/
if (bind & PIPE_BIND_SAMPLER_VIEW)
buf->bo_size = align(buf->bo_size, 256) + 16;
if ((bind & PIPE_BIND_VERTEX_BUFFER) && ilo_dev_gen(dev) < ILO_GEN(7.5)) {
/*
* As noted in ilo_format_translate(), we treat some 3-component formats
* as 4-component formats to work around hardware limitations. Imagine
* the case where the vertex buffer holds a single
* PIPE_FORMAT_R16G16B16_FLOAT vertex, and buf->bo_size is 6. The
* hardware would fail to fetch it at boundary check because the vertex
* buffer is expected to hold a PIPE_FORMAT_R16G16B16A16_FLOAT vertex
* and that takes at least 8 bytes.
*
* For the workaround to work, we should add 2 to the bo size. But that
* would waste a page when the bo size is already page aligned. Let's
* round it to page size for now and revisit this when needed.
*/
buf->bo_size = align(buf->bo_size, 4096);
}
}
static inline void
ilo_buffer_cleanup(struct ilo_buffer *buf)
{
intel_bo_unref(buf->bo);
}
static inline void
ilo_buffer_set_bo(struct ilo_buffer *buf, struct intel_bo *bo)
{
intel_bo_unref(buf->bo);
buf->bo = intel_bo_ref(bo);
}
#endif /* ILO_BUFFER_H */