src/gallium/drivers/ilo/ilo_format.h

   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       switch (format) {
  75       case PIPE_FORMAT_Z16_UNORM:
  76          return BRW_SURFACEFORMAT_I16_UNORM;
  77       case PIPE_FORMAT_Z32_FLOAT:
  78          return BRW_SURFACEFORMAT_I32_FLOAT;
  79       case PIPE_FORMAT_Z24X8_UNORM:
  80       case PIPE_FORMAT_Z24_UNORM_S8_UINT:
  81          return BRW_SURFACEFORMAT_I24X8_UNORM;
  82       case PIPE_FORMAT_Z32_FLOAT_S8X24_UINT:
  83          return BRW_SURFACEFORMAT_I32X32_FLOAT;
  84       default:
  85          return ilo_translate_color_format(format);
  86       }
  87       break;
  88    case PIPE_BIND_VERTEX_BUFFER:
  89       /*
  90        * Some 3-component formats are not supported as vertex element formats.
  91        * But since we move between vertices using vb->stride, we should be
  92        * good to use their 4-component counterparts if we force the W
  93        * component to be one.  The only exception is that the vb boundary
  94        * check for the last vertex may fail.
  95        */
  96       switch (format) {
  97       case PIPE_FORMAT_R16G16B16_FLOAT:
  98          return BRW_SURFACEFORMAT_R16G16B16A16_FLOAT;
  99       case PIPE_FORMAT_R16G16B16_UINT:
 100          return BRW_SURFACEFORMAT_R16G16B16A16_UINT;
 101       case PIPE_FORMAT_R16G16B16_SINT:
 102          return BRW_SURFACEFORMAT_R16G16B16A16_SINT;
 103       case PIPE_FORMAT_R8G8B8_UINT:
 104          return BRW_SURFACEFORMAT_R8G8B8A8_UINT;
 105       case PIPE_FORMAT_R8G8B8_SINT:
 106          return BRW_SURFACEFORMAT_R8G8B8A8_SINT;
 107       default:
 108          return ilo_translate_color_format(format);
 109       }
 110       break;
 111    default:
 112       assert(!"cannot translate format");
 113       break;
 114    }
 115
 116    return -1;
 117 }
 118
 119 static inline int
 120 ilo_translate_render_format(enum pipe_format format)
 121 {
 122    return ilo_translate_format(format, PIPE_BIND_RENDER_TARGET);
 123 }
 124
 125 static inline int
 126 ilo_translate_texture_format(enum pipe_format format)
 127 {
 128    return ilo_translate_format(format, PIPE_BIND_SAMPLER_VIEW);
 129 }
 130
 131 static inline int
 132 ilo_translate_vertex_format(enum pipe_format format)
 133 {
 134    return ilo_translate_format(format, PIPE_BIND_VERTEX_BUFFER);
 135 }
 136
 137 #endif /* ILO_FORMAT_H */