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  1. /*
  2.  * Mesa 3-D graphics library
  3.  *
  4.  * Copyright (C) 2012-2013 LunarG, Inc.
  5.  *
  6.  * Permission is hereby granted, free of charge, to any person obtaining a
  7.  * copy of this software and associated documentation files (the "Software"),
  8.  * to deal in the Software without restriction, including without limitation
  9.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10.  * and/or sell copies of the Software, and to permit persons to whom the
  11.  * Software is furnished to do so, subject to the following conditions:
  12.  *
  13.  * The above copyright notice and this permission notice shall be included
  14.  * in all copies or substantial portions of the Software.
  15.  *
  16.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22.  * DEALINGS IN THE SOFTWARE.
  23.  *
  24.  * Authors:
  25.  *    Chia-I Wu <olv@lunarg.com>
  26.  */
  27.  
  28. #ifndef ILO_FORMAT_H
  29. #define ILO_FORMAT_H
  30.  
  31. #include "brw_defines.h"
  32.  
  33. #include "ilo_common.h"
  34.  
  35. struct ilo_screen;
  36.  
  37. void
  38. ilo_init_format_functions(struct ilo_screen *is);
  39.  
  40. int
  41. ilo_translate_color_format(enum pipe_format format);
  42.  
  43. /**
  44.  * Translate a pipe format to a hardware surface format suitable for
  45.  * the given purpose.  Return -1 on errors.
  46.  *
  47.  * This is an inline function not only for performance reasons.  There are
  48.  * caveats that the callers should that before calling this function.
  49.  */
  50. static inline int
  51. ilo_translate_format(enum pipe_format format, unsigned bind)
  52. {
  53.    switch (bind) {
  54.    case PIPE_BIND_RENDER_TARGET:
  55.       /*
  56.        * Some RGBX formats are not supported as render target formats.  But we
  57.        * can use their RGBA counterparts and force the destination alpha to be
  58.        * one when blending is enabled.
  59.        */
  60.       switch (format) {
  61.       case PIPE_FORMAT_B8G8R8X8_UNORM:
  62.          return BRW_SURFACEFORMAT_B8G8R8A8_UNORM;
  63.       default:
  64.          return ilo_translate_color_format(format);
  65.       }
  66.       break;
  67.    case PIPE_BIND_SAMPLER_VIEW:
  68.       /*
  69.        * For depth formats, we want the depth values to be returned as R
  70.        * values.  But we assume in many places that the depth values are
  71.        * returned as I values (util_make_fragment_tex_shader_writedepth() is
  72.        * one such example).  We have to live with that at least for now.
  73.        *
  74.        * For ETC1 format, the texture data will be decompressed before being
  75.        * written to the bo.  See tex_staging_sys_convert_write().
  76.        */
  77.       switch (format) {
  78.       case PIPE_FORMAT_Z16_UNORM:
  79.          return BRW_SURFACEFORMAT_I16_UNORM;
  80.       case PIPE_FORMAT_Z32_FLOAT:
  81.          return BRW_SURFACEFORMAT_I32_FLOAT;
  82.       case PIPE_FORMAT_Z24X8_UNORM:
  83.       case PIPE_FORMAT_Z24_UNORM_S8_UINT:
  84.          return BRW_SURFACEFORMAT_I24X8_UNORM;
  85.       case PIPE_FORMAT_Z32_FLOAT_S8X24_UINT:
  86.          return BRW_SURFACEFORMAT_I32X32_FLOAT;
  87.       case PIPE_FORMAT_ETC1_RGB8:
  88.          return BRW_SURFACEFORMAT_R8G8B8X8_UNORM;
  89.       default:
  90.          return ilo_translate_color_format(format);
  91.       }
  92.       break;
  93.    case PIPE_BIND_VERTEX_BUFFER:
  94.       /*
  95.        * Some 3-component formats are not supported as vertex element formats.
  96.        * But since we move between vertices using vb->stride, we should be
  97.        * good to use their 4-component counterparts if we force the W
  98.        * component to be one.  The only exception is that the vb boundary
  99.        * check for the last vertex may fail.
  100.        */
  101.       switch (format) {
  102.       case PIPE_FORMAT_R16G16B16_FLOAT:
  103.          return BRW_SURFACEFORMAT_R16G16B16A16_FLOAT;
  104.       case PIPE_FORMAT_R16G16B16_UINT:
  105.          return BRW_SURFACEFORMAT_R16G16B16A16_UINT;
  106.       case PIPE_FORMAT_R16G16B16_SINT:
  107.          return BRW_SURFACEFORMAT_R16G16B16A16_SINT;
  108.       case PIPE_FORMAT_R8G8B8_UINT:
  109.          return BRW_SURFACEFORMAT_R8G8B8A8_UINT;
  110.       case PIPE_FORMAT_R8G8B8_SINT:
  111.          return BRW_SURFACEFORMAT_R8G8B8A8_SINT;
  112.       default:
  113.          return ilo_translate_color_format(format);
  114.       }
  115.       break;
  116.    default:
  117.       assert(!"cannot translate format");
  118.       break;
  119.    }
  120.  
  121.    return -1;
  122. }
  123.  
  124. static inline int
  125. ilo_translate_render_format(enum pipe_format format)
  126. {
  127.    return ilo_translate_format(format, PIPE_BIND_RENDER_TARGET);
  128. }
  129.  
  130. static inline int
  131. ilo_translate_texture_format(enum pipe_format format)
  132. {
  133.    return ilo_translate_format(format, PIPE_BIND_SAMPLER_VIEW);
  134. }
  135.  
  136. static inline int
  137. ilo_translate_vertex_format(enum pipe_format format)
  138. {
  139.    return ilo_translate_format(format, PIPE_BIND_VERTEX_BUFFER);
  140. }
  141.  
  142. #endif /* ILO_FORMAT_H */
  143.