IABSD.fr/xenocara/lib/mesa/src/microsoft/compiler/dxil_buffer.c

Branch : - branch - master - tag -

• Show log

  Commit

• Author : jsg
  Date : 2021-07-22 09:57:37
  Hash : f849497a
  Message : Import Mesa 21.1.5

• lib/mesa/src/microsoft/compiler/dxil_buffer.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;
  }