105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
/*
|
||
* Copyright © Microsoft Corporation
|
||
*
|
||
* 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 (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 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.
|
||
*/
|
||
|
||
#include "dxil_buffer.h"
|
||
#include <assert.h>
|
||
|
||
void
|
||
dxil_buffer_init(struct dxil_buffer *b, unsigned abbrev_width)
|
||
{
|
||
blob_init(&b->blob);
|
||
b->buf = 0;
|
||
b->buf_bits = 0;
|
||
|
||
b->abbrev_width = abbrev_width;
|
||
}
|
||
|
||
void
|
||
dxil_buffer_finish(struct dxil_buffer *b)
|
||
{
|
||
blob_finish(&b->blob);
|
||
}
|
||
|
||
static bool
|
||
flush_dword(struct dxil_buffer *b)
|
||
{
|
||
assert(b->buf_bits >= 32 && b->buf_bits < 64);
|
||
|
||
uint32_t lower_bits = b->buf & UINT32_MAX;
|
||
if (!blob_write_bytes(&b->blob, &lower_bits, sizeof(lower_bits)))
|
||
return false;
|
||
|
||
b->buf >>= 32;
|
||
b->buf_bits -= 32;
|
||
|
||
return true;
|
||
}
|
||
|
||
bool
|
||
dxil_buffer_emit_bits(struct dxil_buffer *b, uint32_t data, unsigned width)
|
||
{
|
||
assert(b->buf_bits < 32);
|
||
assert(width > 0 && width <= 32);
|
||
assert((data & ~((UINT64_C(1) << width) - 1)) == 0);
|
||
|
||
b->buf |= ((uint64_t)data) << b->buf_bits;
|
||
b->buf_bits += width;
|
||
|
||
if (b->buf_bits >= 32)
|
||
return flush_dword(b);
|
||
|
||
return true;
|
||
}
|
||
|
||
bool
|
||
dxil_buffer_emit_vbr_bits(struct dxil_buffer *b, uint64_t data,
|
||
unsigned width)
|
||
{
|
||
assert(width > 1 && width <= 32);
|
||
|
||
uint32_t tag = UINT32_C(1) << (width - 1);
|
||
uint32_t max = tag - 1;
|
||
while (data > max) {
|
||
uint32_t value = (data & max) | tag;
|
||
data >>= width - 1;
|
||
|
||
if (!dxil_buffer_emit_bits(b, value, width))
|
||
return false;
|
||
}
|
||
|
||
return dxil_buffer_emit_bits(b, data, width);
|
||
}
|
||
|
||
bool
|
||
dxil_buffer_align(struct dxil_buffer *b)
|
||
{
|
||
assert(b->buf_bits < 32);
|
||
|
||
if (b->buf_bits) {
|
||
b->buf_bits = 32;
|
||
return flush_dword(b);
|
||
}
|
||
|
||
return true;
|
||
}
|