271 lines
9.5 KiB
C++
271 lines
9.5 KiB
C++
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// Copyright 2017 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include "common/assert.h"
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#include "common/color.h"
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#include "common/logging/log.h"
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#include "common/math_util.h"
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#include "common/vector_math.h"
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#include "video_core/texture/texture_decode.h"
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#include "video_core/utils.h"
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namespace Pica {
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namespace Texture {
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Math::Vec4<u8> LookupTexture(const u8* source, int x, int y, const TextureInfo& info,
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bool disable_alpha) {
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const unsigned int coarse_x = x & ~7;
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const unsigned int coarse_y = y & ~7;
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if (info.format != Regs::TextureFormat::ETC1 && info.format != Regs::TextureFormat::ETC1A4) {
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// TODO(neobrain): Fix code design to unify vertical block offsets!
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source += coarse_y * info.stride;
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}
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// TODO: Assert that width/height are multiples of block dimensions
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switch (info.format) {
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case Regs::TextureFormat::RGBA8: {
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auto res = Color::DecodeRGBA8(source + VideoCore::GetMortonOffset(x, y, 4));
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return {res.r(), res.g(), res.b(), static_cast<u8>(disable_alpha ? 255 : res.a())};
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}
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case Regs::TextureFormat::RGB8: {
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auto res = Color::DecodeRGB8(source + VideoCore::GetMortonOffset(x, y, 3));
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return {res.r(), res.g(), res.b(), 255};
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}
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case Regs::TextureFormat::RGB5A1: {
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auto res = Color::DecodeRGB5A1(source + VideoCore::GetMortonOffset(x, y, 2));
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return {res.r(), res.g(), res.b(), static_cast<u8>(disable_alpha ? 255 : res.a())};
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}
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case Regs::TextureFormat::RGB565: {
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auto res = Color::DecodeRGB565(source + VideoCore::GetMortonOffset(x, y, 2));
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return {res.r(), res.g(), res.b(), 255};
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}
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case Regs::TextureFormat::RGBA4: {
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auto res = Color::DecodeRGBA4(source + VideoCore::GetMortonOffset(x, y, 2));
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return {res.r(), res.g(), res.b(), static_cast<u8>(disable_alpha ? 255 : res.a())};
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}
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case Regs::TextureFormat::IA8: {
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const u8* source_ptr = source + VideoCore::GetMortonOffset(x, y, 2);
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if (disable_alpha) {
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// Show intensity as red, alpha as green
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return {source_ptr[1], source_ptr[0], 0, 255};
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} else {
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return {source_ptr[1], source_ptr[1], source_ptr[1], source_ptr[0]};
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}
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}
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case Regs::TextureFormat::RG8: {
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auto res = Color::DecodeRG8(source + VideoCore::GetMortonOffset(x, y, 2));
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return {res.r(), res.g(), 0, 255};
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}
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case Regs::TextureFormat::I8: {
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const u8* source_ptr = source + VideoCore::GetMortonOffset(x, y, 1);
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return {*source_ptr, *source_ptr, *source_ptr, 255};
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}
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case Regs::TextureFormat::A8: {
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const u8* source_ptr = source + VideoCore::GetMortonOffset(x, y, 1);
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if (disable_alpha) {
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return {*source_ptr, *source_ptr, *source_ptr, 255};
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} else {
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return {0, 0, 0, *source_ptr};
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}
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}
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case Regs::TextureFormat::IA4: {
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const u8* source_ptr = source + VideoCore::GetMortonOffset(x, y, 1);
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u8 i = Color::Convert4To8(((*source_ptr) & 0xF0) >> 4);
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u8 a = Color::Convert4To8((*source_ptr) & 0xF);
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if (disable_alpha) {
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// Show intensity as red, alpha as green
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return {i, a, 0, 255};
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} else {
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return {i, i, i, a};
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}
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}
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case Regs::TextureFormat::I4: {
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u32 morton_offset = VideoCore::GetMortonOffset(x, y, 1);
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const u8* source_ptr = source + morton_offset / 2;
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u8 i = (morton_offset % 2) ? ((*source_ptr & 0xF0) >> 4) : (*source_ptr & 0xF);
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i = Color::Convert4To8(i);
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return {i, i, i, 255};
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}
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case Regs::TextureFormat::A4: {
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u32 morton_offset = VideoCore::GetMortonOffset(x, y, 1);
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const u8* source_ptr = source + morton_offset / 2;
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u8 a = (morton_offset % 2) ? ((*source_ptr & 0xF0) >> 4) : (*source_ptr & 0xF);
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a = Color::Convert4To8(a);
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if (disable_alpha) {
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return {a, a, a, 255};
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} else {
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return {0, 0, 0, a};
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}
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}
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case Regs::TextureFormat::ETC1:
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case Regs::TextureFormat::ETC1A4: {
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bool has_alpha = (info.format == Regs::TextureFormat::ETC1A4);
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// ETC1 further subdivides each 8x8 tile into four 4x4 subtiles
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const int subtile_width = 4;
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const int subtile_height = 4;
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int subtile_index = ((x / subtile_width) & 1) + 2 * ((y / subtile_height) & 1);
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unsigned subtile_bytes = has_alpha ? 2 : 1; // TODO: Name...
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const u64* source_ptr = (const u64*)(source + coarse_x * subtile_bytes * 4 +
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coarse_y * subtile_bytes * 4 * (info.width / 8) +
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subtile_index * subtile_bytes * 8);
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u64 alpha = 0xFFFFFFFFFFFFFFFF;
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if (has_alpha) {
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alpha = *source_ptr;
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source_ptr++;
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}
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union ETC1Tile {
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// Each of these two is a collection of 16 bits (one per lookup value)
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BitField<0, 16, u64> table_subindexes;
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BitField<16, 16, u64> negation_flags;
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unsigned GetTableSubIndex(unsigned index) const {
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return (table_subindexes >> index) & 1;
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}
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bool GetNegationFlag(unsigned index) const {
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return ((negation_flags >> index) & 1) == 1;
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}
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BitField<32, 1, u64> flip;
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BitField<33, 1, u64> differential_mode;
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BitField<34, 3, u64> table_index_2;
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BitField<37, 3, u64> table_index_1;
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union {
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// delta value + base value
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BitField<40, 3, s64> db;
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BitField<43, 5, u64> b;
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BitField<48, 3, s64> dg;
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BitField<51, 5, u64> g;
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BitField<56, 3, s64> dr;
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BitField<59, 5, u64> r;
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} differential;
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union {
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BitField<40, 4, u64> b2;
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BitField<44, 4, u64> b1;
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BitField<48, 4, u64> g2;
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BitField<52, 4, u64> g1;
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BitField<56, 4, u64> r2;
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BitField<60, 4, u64> r1;
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} separate;
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const Math::Vec3<u8> GetRGB(int x, int y) const {
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int texel = 4 * x + y;
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if (flip)
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std::swap(x, y);
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// Lookup base value
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Math::Vec3<int> ret;
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if (differential_mode) {
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ret.r() = static_cast<int>(differential.r);
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ret.g() = static_cast<int>(differential.g);
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ret.b() = static_cast<int>(differential.b);
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if (x >= 2) {
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ret.r() += static_cast<int>(differential.dr);
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ret.g() += static_cast<int>(differential.dg);
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ret.b() += static_cast<int>(differential.db);
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}
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ret.r() = Color::Convert5To8(ret.r());
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ret.g() = Color::Convert5To8(ret.g());
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ret.b() = Color::Convert5To8(ret.b());
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} else {
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if (x < 2) {
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ret.r() = Color::Convert4To8(static_cast<u8>(separate.r1));
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ret.g() = Color::Convert4To8(static_cast<u8>(separate.g1));
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ret.b() = Color::Convert4To8(static_cast<u8>(separate.b1));
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} else {
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ret.r() = Color::Convert4To8(static_cast<u8>(separate.r2));
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ret.g() = Color::Convert4To8(static_cast<u8>(separate.g2));
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ret.b() = Color::Convert4To8(static_cast<u8>(separate.b2));
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}
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}
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// Add modifier
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unsigned table_index =
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static_cast<int>((x < 2) ? table_index_1.Value() : table_index_2.Value());
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static const std::array<std::array<u8, 2>, 8> etc1_modifier_table = {{
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{{2, 8}},
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{{5, 17}},
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{{9, 29}},
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{{13, 42}},
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{{18, 60}},
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{{24, 80}},
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{{33, 106}},
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{{47, 183}},
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}};
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int modifier = etc1_modifier_table.at(table_index).at(GetTableSubIndex(texel));
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if (GetNegationFlag(texel))
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modifier *= -1;
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ret.r() = MathUtil::Clamp(ret.r() + modifier, 0, 255);
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ret.g() = MathUtil::Clamp(ret.g() + modifier, 0, 255);
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ret.b() = MathUtil::Clamp(ret.b() + modifier, 0, 255);
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return ret.Cast<u8>();
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}
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} const* etc1_tile = reinterpret_cast<const ETC1Tile*>(source_ptr);
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alpha >>= 4 * ((x & 3) * 4 + (y & 3));
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return Math::MakeVec(etc1_tile->GetRGB(x & 3, y & 3),
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disable_alpha ? (u8)255 : Color::Convert4To8(alpha & 0xF));
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}
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default:
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LOG_ERROR(HW_GPU, "Unknown texture format: %x", (u32)info.format);
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DEBUG_ASSERT(false);
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return {};
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}
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}
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TextureInfo TextureInfo::FromPicaRegister(const Regs::TextureConfig& config,
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const Regs::TextureFormat& format) {
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TextureInfo info;
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info.physical_address = config.GetPhysicalAddress();
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info.width = config.width;
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info.height = config.height;
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info.format = format;
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info.stride = Pica::Regs::NibblesPerPixel(info.format) * info.width / 2;
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return info;
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}
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} // namespace Texture
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} // namespace Pica
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