src/gallium/drivers/vc4/vc4_formats.c

   1 /*
   2  * Copyright © 2014 Broadcom
   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 /**
  25  * @file vc4_formats.c
  26  *
  27  * Contains the table and accessors for VC4 texture and render target format
  28  * support.
  29  *
  30  * The hardware has limited support for texture formats, and extremely limited
  31  * support for render target formats.  As a result, we emulate other formats
  32  * in our shader code, and this stores the table for doing so.
  33  */
  34
  35 #include "util/format/u_format.h"
  36 #include "util/macros.h"
  37
  38 #include "vc4_context.h"
  39
  40 #define RT_NO        0
  41 #define RT_RGBA8888  1
  42 #define RT_RGB565    2
  43
  44 struct vc4_format {
  45         /** Set if the pipe format is defined in the table. */
  46         bool present;
  47
  48         /** Set to 0 if unsupported, 1 if RGBA8888, 2 if rgb565. */
  49         uint8_t rt_type;
  50
  51         /** One of VC4_TEXTURE_TYPE_*. */
  52         uint8_t tex_type;
  53
  54         /**
  55          * Swizzle to apply to the RGBA shader output for storing to the tile
  56          * buffer, to the RGBA tile buffer to produce shader input (for
  57          * blending), and for turning the rgba8888 texture sampler return
  58          * value into shader rgba values.
  59          */
  60         uint8_t swizzle[4];
  61 };
  62
  63 #define SWIZ(x,y,z,w) {          \
  64         PIPE_SWIZZLE_##x, \
  65         PIPE_SWIZZLE_##y, \
  66         PIPE_SWIZZLE_##z, \
  67         PIPE_SWIZZLE_##w  \
  68 }
  69
  70 #define FORMAT(pipe, rt, tex, swiz)                                     \
  71         [PIPE_FORMAT_##pipe] = { true, RT_##rt, VC4_TEXTURE_TYPE_##tex, swiz }
  72
  73 static const struct vc4_format vc4_format_table[] = {
  74         FORMAT(R8G8B8A8_UNORM, RGBA8888, RGBA8888, SWIZ(X, Y, Z, W)),
  75         FORMAT(R8G8B8X8_UNORM, RGBA8888, RGBA8888, SWIZ(X, Y, Z, 1)),
  76         FORMAT(R8G8B8A8_SRGB,  RGBA8888, RGBA8888, SWIZ(X, Y, Z, W)),
  77         FORMAT(R8G8B8X8_SRGB,  RGBA8888, RGBA8888, SWIZ(X, Y, Z, 1)),
  78
  79         FORMAT(B8G8R8A8_UNORM, RGBA8888, RGBA8888, SWIZ(Z, Y, X, W)),
  80         FORMAT(B8G8R8X8_UNORM, RGBA8888, RGBA8888, SWIZ(Z, Y, X, 1)),
  81         FORMAT(B8G8R8A8_SRGB, RGBA8888, RGBA8888, SWIZ(Z, Y, X, W)),
  82         FORMAT(B8G8R8X8_SRGB, RGBA8888, RGBA8888, SWIZ(Z, Y, X, 1)),
  83
  84         FORMAT(B5G6R5_UNORM, RGB565, RGB565, SWIZ(X, Y, Z, 1)),
  85
  86         FORMAT(ETC1_RGB8, NO, ETC1, SWIZ(X, Y, Z, 1)),
  87
  88         /* Depth sampling will be handled by doing nearest filtering and not
  89          * unpacking the RGBA value.
  90          */
  91         FORMAT(S8_UINT_Z24_UNORM, NO, RGBA8888, SWIZ(X, Y, Z, W)),
  92         FORMAT(X8Z24_UNORM,       NO, RGBA8888, SWIZ(X, Y, Z, W)),
  93
  94         FORMAT(B4G4R4A4_UNORM, NO, RGBA4444, SWIZ(Y, Z, W, X)),
  95         FORMAT(B4G4R4X4_UNORM, NO, RGBA4444, SWIZ(Y, Z, W, 1)),
  96
  97         FORMAT(A1B5G5R5_UNORM, NO, RGBA5551, SWIZ(X, Y, Z, W)),
  98         FORMAT(X1B5G5R5_UNORM, NO, RGBA5551, SWIZ(X, Y, Z, 1)),
  99
 100         FORMAT(A8_UNORM, NO, ALPHA, SWIZ(0, 0, 0, W)),
 101         FORMAT(L8_UNORM, NO, ALPHA, SWIZ(W, W, W, 1)),
 102         FORMAT(I8_UNORM, NO, ALPHA, SWIZ(W, W, W, W)),
 103         FORMAT(R8_UNORM, NO, ALPHA, SWIZ(W, 0, 0, 1)),
 104
 105         FORMAT(L8A8_UNORM, NO, LUMALPHA, SWIZ(X, X, X, W)),
 106         FORMAT(R8G8_UNORM, NO, LUMALPHA, SWIZ(X, W, 0, 1)),
 107 };
 108
 109 static const struct vc4_format *
 110 get_format(enum pipe_format f)
 111 {
 112         if (f >= ARRAY_SIZE(vc4_format_table) ||
 113             !vc4_format_table[f].present)
 114                 return NULL;
 115         else
 116                 return &vc4_format_table[f];
 117 }
 118
 119 bool
 120 vc4_rt_format_supported(enum pipe_format f)
 121 {
 122         const struct vc4_format *vf = get_format(f);
 123
 124         if (!vf)
 125                 return false;
 126
 127         return vf->rt_type != RT_NO;
 128 }
 129
 130 bool
 131 vc4_rt_format_is_565(enum pipe_format f)
 132 {
 133         const struct vc4_format *vf = get_format(f);
 134
 135         if (!vf)
 136                 return false;
 137
 138         return vf->rt_type == RT_RGB565;
 139 }
 140
 141 bool
 142 vc4_tex_format_supported(enum pipe_format f)
 143 {
 144         const struct vc4_format *vf = get_format(f);
 145
 146         return vf != NULL;
 147 }
 148
 149 uint8_t
 150 vc4_get_tex_format(enum pipe_format f)
 151 {
 152         const struct vc4_format *vf = get_format(f);
 153
 154         if (!vf)
 155                 return 0;
 156
 157         return vf->tex_type;
 158 }
 159
 160 const uint8_t *
 161 vc4_get_format_swizzle(enum pipe_format f)
 162 {
 163         const struct vc4_format *vf = get_format(f);
 164         static const uint8_t fallback[] = {0, 1, 2, 3};
 165
 166         if (!vf)
 167                 return fallback;
 168
 169         return vf->swizzle;
 170 }