src/gallium/drivers/panfrost/pan_format.c

   1 /*
   2  * © Copyright 2018 Alyssa Rosenzweig
   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 FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  *
  23  */
  24
  25 #include "pan_format.h"
  26
  27 /* From panwrap/panwrap-decoder, but we don't want to bring in all those headers */
  28 char *panwrap_format_name(enum mali_format format);
  29
  30 /* Construct a default swizzle based on the number of components */
  31
  32 static unsigned
  33 panfrost_translate_swizzle(enum pipe_swizzle s)
  34 {
  35         switch (s) {
  36         case PIPE_SWIZZLE_X:
  37                 return MALI_CHANNEL_RED;
  38
  39         case PIPE_SWIZZLE_Y:
  40                 return MALI_CHANNEL_GREEN;
  41
  42         case PIPE_SWIZZLE_Z:
  43                 return MALI_CHANNEL_BLUE;
  44
  45         case PIPE_SWIZZLE_W:
  46                 return MALI_CHANNEL_ALPHA;
  47
  48         case PIPE_SWIZZLE_0:
  49         case PIPE_SWIZZLE_NONE:
  50                 return MALI_CHANNEL_ZERO;
  51
  52         case PIPE_SWIZZLE_1:
  53                 return MALI_CHANNEL_ONE;
  54
  55         default:
  56                 assert(0);
  57                 return 0;
  58         }
  59 }
  60
  61 /* Translate a Gallium swizzle quad to a 12-bit Mali swizzle code */
  62
  63 unsigned
  64 panfrost_translate_swizzle_4(const unsigned char swizzle[4])
  65 {
  66         unsigned out = 0;
  67
  68         for (unsigned i = 0; i < 4; ++i) {
  69                 unsigned translated = panfrost_translate_swizzle(swizzle[i]);
  70                 out |= (translated << (3*i));
  71         }
  72
  73         return out;
  74 }
  75
  76 unsigned
  77 panfrost_get_default_swizzle(unsigned components)
  78 {
  79         unsigned char default_swizzles[4][4] = {
  80                 {PIPE_SWIZZLE_X, PIPE_SWIZZLE_0, PIPE_SWIZZLE_0, PIPE_SWIZZLE_1},
  81                 {PIPE_SWIZZLE_X, PIPE_SWIZZLE_Y, PIPE_SWIZZLE_0, PIPE_SWIZZLE_1},
  82                 {PIPE_SWIZZLE_X, PIPE_SWIZZLE_Y, PIPE_SWIZZLE_Z, PIPE_SWIZZLE_1},
  83                 {PIPE_SWIZZLE_X, PIPE_SWIZZLE_Y, PIPE_SWIZZLE_Z, PIPE_SWIZZLE_W},
  84         };
  85
  86         assert(components >= 1 && components <= 4);
  87         return panfrost_translate_swizzle_4(default_swizzles[components - 1]);
  88 }
  89
  90 static unsigned
  91 panfrost_translate_channel_width(unsigned size)
  92 {
  93         switch (size) {
  94                 case 4:
  95                         return MALI_CHANNEL_4;
  96                 case 8:
  97                         return MALI_CHANNEL_8;
  98                 case 16:
  99                         return MALI_CHANNEL_16;
 100                 case 32:
 101                         return MALI_CHANNEL_32;
 102                 default:
 103                         fprintf(stderr, "Unknown width %d\n", size);
 104                         assert(0);
 105                         return 0;
 106         }
 107 }
 108
 109 static unsigned
 110 panfrost_translate_channel_type(unsigned type, unsigned size, bool norm) {
 111         switch (type) {
 112                 case UTIL_FORMAT_TYPE_UNSIGNED:
 113                         return norm ? MALI_FORMAT_UNORM : MALI_FORMAT_UINT;
 114
 115                 case UTIL_FORMAT_TYPE_SIGNED:
 116                         return norm ? MALI_FORMAT_SNORM : MALI_FORMAT_SINT;
 117
 118                 case UTIL_FORMAT_TYPE_FLOAT:
 119                         if (size == 16) {
 120                                 /* With FLOAT, fp16 */
 121                                 return MALI_FORMAT_SINT;
 122                         } else if (size == 32) {
 123                                 /* With FLOAT< fp32 */
 124                                 return MALI_FORMAT_UNORM;
 125                         } else {
 126                                 assert(0);
 127                                 return 0;
 128                         }
 129
 130                 default:
 131                         assert(0);
 132                         return 0;
 133         }
 134 }
 135
 136 /* Constructs a mali_format satisfying the specified Gallium format
 137  * description */
 138
 139 enum mali_format
 140 panfrost_find_format(const struct util_format_description *desc)
 141 {
 142         /* Find first non-VOID channel */
 143         struct util_format_channel_description chan = desc->channel[0];
 144
 145         for (unsigned c = 0; c < 4; ++c) {
 146                 if (desc->channel[c].type == UTIL_FORMAT_TYPE_VOID)
 147                         continue;
 148
 149                 chan = desc->channel[c];
 150                 break;
 151         }
 152
 153         /* Check for special formats */
 154         switch (desc->format) {
 155                 case PIPE_FORMAT_YV12:
 156                 case PIPE_FORMAT_YV16:
 157                 case PIPE_FORMAT_IYUV:
 158                 case PIPE_FORMAT_NV21:
 159                         fprintf(stderr, "YUV format type %s (%d) is not yet supported, but it's probably close to NV12!\n", desc->name, desc->format);
 160                         assert(0);
 161                         break;
 162
 163                 case PIPE_FORMAT_NV12:
 164                         return MALI_NV12;
 165
 166                 case PIPE_FORMAT_R10G10B10X2_UNORM:
 167                 case PIPE_FORMAT_B10G10R10X2_UNORM:
 168                 case PIPE_FORMAT_R10G10B10A2_UNORM:
 169                 case PIPE_FORMAT_B10G10R10A2_UNORM:
 170                         return MALI_RGB10_A2_UNORM;
 171
 172                 case PIPE_FORMAT_R10G10B10X2_SNORM:
 173                 case PIPE_FORMAT_R10G10B10A2_SNORM:
 174                 case PIPE_FORMAT_B10G10R10A2_SNORM:
 175                         return MALI_RGB10_A2_SNORM;
 176
 177                 case PIPE_FORMAT_R10G10B10A2_UINT:
 178                 case PIPE_FORMAT_B10G10R10A2_UINT:
 179                         return MALI_RGB10_A2UI;
 180
 181                 /* TODO: ZS isn't really special case */
 182                 case PIPE_FORMAT_Z32_UNORM:
 183                         return MALI_Z32_UNORM;
 184
 185                 case PIPE_FORMAT_B5G6R5_UNORM:
 186                         return MALI_RGB565;
 187
 188                 case PIPE_FORMAT_B5G5R5A1_UNORM:
 189                         return MALI_RGB5_A1_UNORM;
 190
 191                 case PIPE_FORMAT_A1B5G5R5_UNORM:
 192                 case PIPE_FORMAT_X1B5G5R5_UNORM:
 193                         /* Not supported - this is backwards from OpenGL! */
 194                         assert(0);
 195                         break;
 196
 197                 case PIPE_FORMAT_R32_FIXED:
 198                         return MALI_R32_FIXED;
 199                 case PIPE_FORMAT_R32G32_FIXED:
 200                         return MALI_RG32_FIXED;
 201                 case PIPE_FORMAT_R32G32B32_FIXED:
 202                         return MALI_RGB32_FIXED;
 203                 case PIPE_FORMAT_R32G32B32A32_FIXED:
 204                         return MALI_RGBA32_FIXED;
 205
 206                 default:
 207                         /* Fallthrough to default */
 208                         break;
 209         }
 210
 211         /* Formats must match in channel count */
 212         assert(desc->nr_channels >= 1 && desc->nr_channels <= 4);
 213         unsigned format = MALI_NR_CHANNELS(desc->nr_channels);
 214
 215         switch (chan.type) {
 216                 case UTIL_FORMAT_TYPE_UNSIGNED:
 217                 case UTIL_FORMAT_TYPE_SIGNED:
 218                 case UTIL_FORMAT_TYPE_FIXED:
 219                         /* Channel width */
 220                         format |= panfrost_translate_channel_width(chan.size);
 221
 222                         /* Channel type */
 223                         format |= panfrost_translate_channel_type(chan.type, chan.size, chan.normalized);
 224                         break;
 225
 226                 case UTIL_FORMAT_TYPE_FLOAT:
 227                         /* Float formats use a special width and encode width
 228                          * with type mixed */
 229
 230                         format |= MALI_CHANNEL_FLOAT;
 231                         format |= panfrost_translate_channel_type(chan.type, chan.size, chan.normalized);
 232                         break;
 233
 234                 default:
 235                         fprintf(stderr, "Unknown format type in %s\n", desc->name);
 236                         assert(0);
 237                         break;
 238         }
 239
 240         return (enum mali_format) format;
 241 }
 242
 243