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* Copyright (c) 2019 Etnaviv Project
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* Copyright (C) 2019 Zodiac Inflight Innovations
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sub license,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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* Christian Gmeiner <christian.gmeiner@gmail.com>
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#include "etnaviv_etc2.h"
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#include "etnaviv_resource.h"
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#include "etnaviv_screen.h"
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#include "hw/common.xml.h"
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#include "util/format/u_format.h"
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etna_etc2_needs_patching(const struct pipe_resource *prsc)
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const struct etna_screen *screen = etna_screen(prsc->screen);
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if (!util_format_is_etc(prsc->format))
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if (VIV_FEATURE(screen, chipMinorFeatures2, HALTI1))
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switch (prsc->format) {
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case PIPE_FORMAT_ETC2_RGB8:
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case PIPE_FORMAT_ETC2_SRGB8:
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case PIPE_FORMAT_ETC2_RGB8A1:
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case PIPE_FORMAT_ETC2_SRGB8A1:
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case PIPE_FORMAT_ETC2_RGBA8:
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case PIPE_FORMAT_ETC2_SRGBA8:
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needs_patching(uint8_t *buffer, bool punchthrough_alpha)
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/* punchthrough_alpha or etc2 individual mode? */
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if (!punchthrough_alpha && !(buffer[3] & 0x2))
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static const int lookup[8] = { 0, 1, 2, 3, -4, -3, -2, -1 };
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const int R_plus_dR = (buffer[0] >> 3) + lookup[buffer[0] & 0x7];
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if (R_plus_dR < 0 || R_plus_dR > 31)
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etna_etc2_calculate_blocks(uint8_t *buffer, unsigned stride,
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unsigned width, unsigned height,
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enum pipe_format format,
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struct util_dynarray *offsets)
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const unsigned bw = util_format_get_blockwidth(format);
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const unsigned bh = util_format_get_blockheight(format);
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const unsigned bs = util_format_get_blocksize(format);
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bool punchthrough_alpha = false;
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const uint8_t *base = buffer;
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if (format == PIPE_FORMAT_ETC2_RGB8A1 ||
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format == PIPE_FORMAT_ETC2_SRGB8A1)
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punchthrough_alpha = true;
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if (format == PIPE_FORMAT_ETC2_RGBA8 ||
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format == PIPE_FORMAT_ETC2_SRGBA8 ||
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format == PIPE_FORMAT_ETC2_SRGB8A1)
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for (unsigned y = 0; y < height; y += bh) {
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uint8_t *src = buffer;
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for (unsigned x = 0; x < width; x += bw) {
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if (needs_patching(src + offset, punchthrough_alpha))
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util_dynarray_append(offsets, unsigned, src + offset - base);
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swap_colors(uint8_t *buffer)
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const uint8_t r1a = (buffer[0] & 0x18) >> 3;
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const uint8_t r1b = (buffer[0] & 0x3);
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const uint8_t r1 = (r1a << 2) | r1b;
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const uint8_t g1 = (buffer[1] & 0xf0) >> 4;
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const uint8_t b1 = (buffer[1] & 0x0f);
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const uint8_t r2 = (buffer[2] & 0xf0) >> 4;
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const uint8_t g2 = buffer[2] & 0x0f;
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const uint8_t b2 = (buffer[3] & 0xf0) >> 4;
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const uint8_t rest = (buffer[3] & 0x0f);
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/* fixup R and dR used for t-mode detection */
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static const uint8_t fixup[16] = {
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0x04, 0x04, 0x04, 0x04,
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0x04, 0x04, 0x04, 0xe0,
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0x04, 0x04, 0xe0, 0xe0,
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0x04, 0xe0, 0xe0, 0xe0
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buffer[0] = fixup[r2] | ((r2 & 0x0c) << 1) | (r2 & 0x03);
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buffer[1] = (g2 << 4) | b2;
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buffer[2] = (r1 << 4) | g1;
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buffer[3] = (b1 << 4) | rest;
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etna_etc2_patch(uint8_t *buffer, const struct util_dynarray *offsets)
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util_dynarray_foreach(offsets, unsigned, offset)
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swap_colors(buffer + *offset);