1f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org/* 2f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Copyright (C) 2011 LunarG, Inc. 3f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * 4f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Permission is hereby granted, free of charge, to any person obtaining a 5f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * copy of this software and associated documentation files (the "Software"), 6f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * to deal in the Software without restriction, including without limitation 7f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * and/or sell copies of the Software, and to permit persons to whom the 9f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Software is furnished to do so, subject to the following conditions: 10f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * 11f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * The above copyright notice and this permission notice (including the next 12f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * paragraph) shall be included in all copies or substantial portions of the 13f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Software. 14f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * 15f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 21f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * DEALINGS IN THE SOFTWARE. 22f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org */ 23f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 24f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org/* 25f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Included by texcompress_etc1 and gallium to define ETC1 decoding routines. 26f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org */ 27f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 28f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgstruct TAG(etc1_block) { 29f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org uint32_t pixel_indices; 30f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org int flipped; 31f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const int *modifier_tables[2]; 32f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org UINT8_TYPE base_colors[2][3]; 33f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org}; 34f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 35f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgstatic UINT8_TYPE 36f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgTAG(etc1_base_color_diff_hi)(UINT8_TYPE in) 37f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 38f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return (in & 0xf8) | (in >> 5); 39f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 40f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 41f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgstatic UINT8_TYPE 42f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgTAG(etc1_base_color_diff_lo)(UINT8_TYPE in) 43f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 44f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org static const int lookup[8] = { 0, 1, 2, 3, -4, -3, -2, -1 }; 45f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 46f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org in = (in >> 3) + lookup[in & 0x7]; 47f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 48f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return (in << 3) | (in >> 2); 49f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 50f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 51f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgstatic UINT8_TYPE 52f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgTAG(etc1_base_color_ind_hi)(UINT8_TYPE in) 53f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 54f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return (in & 0xf0) | ((in & 0xf0) >> 4); 55f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 56f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 57f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgstatic UINT8_TYPE 58f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgTAG(etc1_base_color_ind_lo)(UINT8_TYPE in) 59f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 60f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return ((in & 0xf) << 4) | (in & 0xf); 61f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 62f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 63f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgstatic UINT8_TYPE 64f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgTAG(etc1_clamp)(UINT8_TYPE base, int modifier) 65f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 66f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org int tmp = (int) base + modifier; 67f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 68f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /* CLAMP(tmp, 0, 255) */ 69f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return (UINT8_TYPE) ((tmp < 0) ? 0 : ((tmp > 255) ? 255 : tmp)); 70f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 71f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 72f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgstatic const int TAG(etc1_modifier_tables)[8][4] = { 73f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org { 2, 8, -2, -8}, 74f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org { 5, 17, -5, -17}, 75f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org { 9, 29, -9, -29}, 76f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org { 13, 42, -13, -42}, 77f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org { 18, 60, -18, -60}, 78f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org { 24, 80, -24, -80}, 79f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org { 33, 106, -33, -106}, 80f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org { 47, 183, -47, -183} 81f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org}; 82f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 83f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgstatic void 84f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgTAG(etc1_parse_block)(struct TAG(etc1_block) *block, const UINT8_TYPE *src) 85f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 86f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (src[3] & 0x2) { 87f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /* differential mode */ 88f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org block->base_colors[0][0] = (int) TAG(etc1_base_color_diff_hi)(src[0]); 89f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org block->base_colors[1][0] = (int) TAG(etc1_base_color_diff_lo)(src[0]); 90f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org block->base_colors[0][1] = (int) TAG(etc1_base_color_diff_hi)(src[1]); 91f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org block->base_colors[1][1] = (int) TAG(etc1_base_color_diff_lo)(src[1]); 92f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org block->base_colors[0][2] = (int) TAG(etc1_base_color_diff_hi)(src[2]); 93f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org block->base_colors[1][2] = (int) TAG(etc1_base_color_diff_lo)(src[2]); 94f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 95f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org else { 96f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /* individual mode */ 97f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org block->base_colors[0][0] = (int) TAG(etc1_base_color_ind_hi)(src[0]); 98f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org block->base_colors[1][0] = (int) TAG(etc1_base_color_ind_lo)(src[0]); 99f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org block->base_colors[0][1] = (int) TAG(etc1_base_color_ind_hi)(src[1]); 100f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org block->base_colors[1][1] = (int) TAG(etc1_base_color_ind_lo)(src[1]); 101f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org block->base_colors[0][2] = (int) TAG(etc1_base_color_ind_hi)(src[2]); 102f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org block->base_colors[1][2] = (int) TAG(etc1_base_color_ind_lo)(src[2]); 103f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 104f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 105f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /* pick modifier tables */ 106f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org block->modifier_tables[0] = TAG(etc1_modifier_tables)[(src[3] >> 5) & 0x7]; 107f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org block->modifier_tables[1] = TAG(etc1_modifier_tables)[(src[3] >> 2) & 0x7]; 108f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 109f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org block->flipped = (src[3] & 0x1); 110f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 111f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org block->pixel_indices = 112f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org (src[4] << 24) | (src[5] << 16) | (src[6] << 8) | src[7]; 113f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 114f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 115f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgstatic void 116f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgTAG(etc1_fetch_texel)(const struct TAG(etc1_block) *block, 117f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org int x, int y, UINT8_TYPE *dst) 118f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 119f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const UINT8_TYPE *base_color; 120f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org int modifier, bit, idx, blk; 121f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 122f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /* get pixel index */ 123f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org bit = y + x * 4; 124f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org idx = ((block->pixel_indices >> (15 + bit)) & 0x2) | 125f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org ((block->pixel_indices >> (bit)) & 0x1); 126f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 127f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org /* get subblock */ 128f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org blk = (block->flipped) ? (y >= 2) : (x >= 2); 129f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 130f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org base_color = block->base_colors[blk]; 131f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org modifier = block->modifier_tables[blk][idx]; 132f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 133f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org dst[0] = TAG(etc1_clamp)(base_color[0], modifier); 134f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org dst[1] = TAG(etc1_clamp)(base_color[1], modifier); 135f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org dst[2] = TAG(etc1_clamp)(base_color[2], modifier); 136f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 137f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 138f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgstatic void 139f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgetc1_unpack_rgba8888(uint8_t *dst_row, 140f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org unsigned dst_stride, 141f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const uint8_t *src_row, 142f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org unsigned src_stride, 143f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org unsigned width, 144f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org unsigned height) 145f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 146f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const unsigned bw = 4, bh = 4, bs = 8, comps = 4; 147f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org struct etc1_block block; 148f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org unsigned x, y, i, j; 149f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 150f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org for (y = 0; y < height; y += bh) { 151f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const uint8_t *src = src_row; 152f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 153f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org for (x = 0; x < width; x+= bw) { 154f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org etc1_parse_block(&block, src); 155f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 156f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org for (j = 0; j < bh; j++) { 157f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps; 158f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org for (i = 0; i < bw; i++) { 159f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org etc1_fetch_texel(&block, i, j, dst); 160f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org dst[3] = 255; 161f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org dst += comps; 162f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 163f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 164f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 165f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org src += bs; 166f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 167f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 168f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org src_row += src_stride; 169f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 170f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 171