src/gallium/drivers/etnaviv/etnaviv_etc2.c

   1 /*
   2  * Copyright (c) 2019 Etnaviv Project
   3  * Copyright (C) 2019 Zodiac Inflight Innovations
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sub license,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the
  13  * next paragraph) shall be included in all copies or substantial portions
  14  * 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 NON-INFRINGEMENT. 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  *    Christian Gmeiner <christian.gmeiner@gmail.com>
  26  */
  27
  28 #include "etnaviv_etc2.h"
  29 #include "etnaviv_resource.h"
  30 #include "etnaviv_screen.h"
  31 #include "hw/common.xml.h"
  32 #include "util/format/u_format.h"
  33
  34 bool
  35 etna_etc2_needs_patching(const struct pipe_resource *prsc)
  36 {
  37    const struct etna_screen *screen = etna_screen(prsc->screen);
  38
  39    if (!util_format_is_etc(prsc->format))
  40       return false;
  41
  42    if (VIV_FEATURE(screen, chipMinorFeatures2, HALTI1))
  43       return false;
  44
  45    switch (prsc->format) {
  46    case PIPE_FORMAT_ETC2_RGB8:
  47    case PIPE_FORMAT_ETC2_SRGB8:
  48    case PIPE_FORMAT_ETC2_RGB8A1:
  49    case PIPE_FORMAT_ETC2_SRGB8A1:
  50    case PIPE_FORMAT_ETC2_RGBA8:
  51    case PIPE_FORMAT_ETC2_SRGBA8:
  52       return true;
  53       break;
  54
  55    default:
  56       return false;
  57    }
  58 }
  59
  60 static inline bool
  61 needs_patching(uint8_t *buffer, bool punchthrough_alpha)
  62 {
  63    /* punchthrough_alpha or etc2 individual mode? */
  64    if (!punchthrough_alpha && !(buffer[3] & 0x2))
  65      return false;
  66
  67    /* etc2 t-mode? */
  68    static const int lookup[8] = { 0, 1, 2, 3, -4, -3, -2, -1 };
  69    const int R_plus_dR = (buffer[0] >> 3) + lookup[buffer[0] & 0x7];
  70
  71    if (R_plus_dR < 0 || R_plus_dR > 31)
  72       return true;
  73
  74    return false;
  75 }
  76
  77 void
  78 etna_etc2_calculate_blocks(uint8_t *buffer, unsigned stride,
  79                            unsigned width, unsigned height,
  80                            enum pipe_format format,
  81                            struct util_dynarray *offsets)
  82 {
  83    const unsigned bw = util_format_get_blockwidth(format);
  84    const unsigned bh = util_format_get_blockheight(format);
  85    const unsigned bs = util_format_get_blocksize(format);
  86    bool punchthrough_alpha = false;
  87    unsigned offset = 0;
  88    const uint8_t *base = buffer;
  89
  90    if (format == PIPE_FORMAT_ETC2_RGB8A1 ||
  91        format == PIPE_FORMAT_ETC2_SRGB8A1)
  92       punchthrough_alpha = true;
  93
  94    if (format == PIPE_FORMAT_ETC2_RGBA8 ||
  95        format == PIPE_FORMAT_ETC2_SRGBA8 ||
  96        format == PIPE_FORMAT_ETC2_SRGB8A1)
  97       offset = 8;
  98
  99    for (unsigned y = 0; y < height; y += bh) {
 100       uint8_t *src = buffer;
 101
 102       for (unsigned x = 0; x < width; x += bw) {
 103          if (needs_patching(src + offset, punchthrough_alpha))
 104             util_dynarray_append(offsets, unsigned, src + offset - base);
 105
 106          src += bs;
 107       }
 108
 109       buffer += stride;
 110    }
 111 }
 112
 113 static inline void
 114 swap_colors(uint8_t *buffer)
 115 {
 116    const uint8_t r1a = (buffer[0] & 0x18) >> 3;
 117    const uint8_t r1b = (buffer[0] & 0x3);
 118    const uint8_t r1 = (r1a << 2) | r1b;
 119    const uint8_t g1 = (buffer[1] & 0xf0) >> 4;
 120    const uint8_t b1 = (buffer[1] & 0x0f);
 121    const uint8_t r2 = (buffer[2] & 0xf0) >> 4;
 122    const uint8_t g2 = buffer[2] & 0x0f;
 123    const uint8_t b2 = (buffer[3] & 0xf0) >> 4;
 124    const uint8_t rest = (buffer[3] & 0x0f);
 125
 126    /* fixup R and dR used for t-mode detection */
 127    static const uint8_t fixup[16] = {
 128       0x04, 0x04, 0x04, 0x04,
 129       0x04, 0x04, 0x04, 0xe0,
 130       0x04, 0x04, 0xe0, 0xe0,
 131       0x04, 0xe0, 0xe0, 0xe0
 132    };
 133
 134    /* swap colors */
 135    buffer[0] = fixup[r2] | ((r2 & 0x0c) << 1) | (r2 & 0x03);
 136    buffer[1] = (g2 << 4) | b2;
 137    buffer[2] = (r1 << 4) | g1;
 138    buffer[3] = (b1 << 4) | rest;
 139 }
 140
 141 void
 142 etna_etc2_patch(uint8_t *buffer, const struct util_dynarray *offsets)
 143 {
 144    util_dynarray_foreach(offsets, unsigned, offset)
 145       swap_colors(buffer + *offset);
 146 }