src/amd/common/ac_shader_util.c

   1 /*
   2  * Copyright 2012 Advanced Micro Devices, Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #include "ac_shader_util.h"
  25 #include "sid.h"
  26
  27 unsigned
  28 ac_get_spi_shader_z_format(bool writes_z, bool writes_stencil,
  29                            bool writes_samplemask)
  30 {
  31         if (writes_z) {
  32                 /* Z needs 32 bits. */
  33                 if (writes_samplemask)
  34                         return V_028710_SPI_SHADER_32_ABGR;
  35                 else if (writes_stencil)
  36                         return V_028710_SPI_SHADER_32_GR;
  37                 else
  38                         return V_028710_SPI_SHADER_32_R;
  39         } else if (writes_stencil || writes_samplemask) {
  40                 /* Both stencil and sample mask need only 16 bits. */
  41                 return V_028710_SPI_SHADER_UINT16_ABGR;
  42         } else {
  43                 return V_028710_SPI_SHADER_ZERO;
  44         }
  45 }