Yuri Kunde Schlesner
GitHub
commit
18c981b996
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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 <array>
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#include "common/bit_field.h"
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#include "common/color.h"
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#include "common/common_types.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/etc1.h"
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namespace Pica {
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namespace Texture {
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namespace {
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constexpr std::array<u8[2], 8> etc1_modifier_table = {{
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{2, 8}, {5, 17}, {9, 29}, {13, 42}, {18, 60}, {24, 80}, {33, 106}, {47, 183},
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}};
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union ETC1Tile {
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u64 raw;
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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(unsigned int x, unsigned 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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int modifier = etc1_modifier_table[table_index][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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};
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} // anonymous namespace
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Math::Vec3<u8> SampleETC1Subtile(u64 value, unsigned int x, unsigned int y) {
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ETC1Tile tile{value};
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return tile.GetRGB(x, y);
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}
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} // namespace Texture
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} // namespace Pica
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@ -0,0 +1,16 @@
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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/common_types.h"
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#include "common/vector_math.h"
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namespace Pica {
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namespace Texture {
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Math::Vec3<u8> SampleETC1Subtile(u64 value, unsigned int x, unsigned int y);
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} // namespace Texture
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} // namespace Pica
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@ -0,0 +1,229 @@
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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/swap.h"
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#include "common/vector_math.h"
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#include "video_core/pica.h"
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#include "video_core/texture/etc1.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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using TextureFormat = Pica::Regs::TextureFormat;
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namespace Pica {
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namespace Texture {
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constexpr size_t TILE_SIZE = 8 * 8;
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constexpr size_t ETC1_SUBTILES = 2 * 2;
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size_t CalculateTileSize(TextureFormat format) {
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switch (format) {
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case TextureFormat::RGBA8:
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return 4 * TILE_SIZE;
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case TextureFormat::RGB8:
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return 3 * TILE_SIZE;
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case TextureFormat::RGB5A1:
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case TextureFormat::RGB565:
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case TextureFormat::RGBA4:
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case TextureFormat::IA8:
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case TextureFormat::RG8:
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return 2 * TILE_SIZE;
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case TextureFormat::I8:
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case TextureFormat::A8:
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case TextureFormat::IA4:
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return 1 * TILE_SIZE;
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case TextureFormat::I4:
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case TextureFormat::A4:
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return TILE_SIZE / 2;
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case TextureFormat::ETC1:
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return ETC1_SUBTILES * 8;
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case TextureFormat::ETC1A4:
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return ETC1_SUBTILES * 16;
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default: // placeholder for yet unknown formats
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UNIMPLEMENTED();
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return 0;
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}
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}
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Math::Vec4<u8> LookupTexture(const u8* source, unsigned int x, unsigned int y,
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const TextureInfo& info, bool disable_alpha) {
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// Coordinate in tiles
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const unsigned int coarse_x = x / 8;
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const unsigned int coarse_y = y / 8;
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// Coordinate inside the tile
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const unsigned int fine_x = x % 8;
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const unsigned int fine_y = y % 8;
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const u8* line = source + coarse_y * info.stride;
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const u8* tile = line + coarse_x * CalculateTileSize(info.format);
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return LookupTexelInTile(tile, fine_x, fine_y, info, disable_alpha);
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}
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Math::Vec4<u8> LookupTexelInTile(const u8* source, unsigned int x, unsigned int y,
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const TextureInfo& info, bool disable_alpha) {
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DEBUG_ASSERT(x < 8);
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DEBUG_ASSERT(y < 8);
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using VideoCore::MortonInterleave;
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switch (info.format) {
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case Regs::TextureFormat::RGBA8: {
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auto res = Color::DecodeRGBA8(source + MortonInterleave(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 + MortonInterleave(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 + MortonInterleave(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 + MortonInterleave(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 + MortonInterleave(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 + MortonInterleave(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 + MortonInterleave(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 + MortonInterleave(x, y);
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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 + MortonInterleave(x, y);
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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 + MortonInterleave(x, y);
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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 = MortonInterleave(x, y);
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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 = MortonInterleave(x, y);
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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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size_t subtile_size = has_alpha ? 16 : 8;
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// ETC1 further subdivides each 8x8 tile into four 4x4 subtiles
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constexpr unsigned int subtile_width = 4;
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constexpr unsigned int subtile_height = 4;
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unsigned int subtile_index = (x / subtile_width) + 2 * (y / subtile_height);
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x %= subtile_width;
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y %= subtile_height;
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const u8* subtile_ptr = source + subtile_index * subtile_size;
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u8 alpha = 255;
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if (has_alpha) {
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u64_le packed_alpha;
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memcpy(&packed_alpha, subtile_ptr, sizeof(u64));
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subtile_ptr += sizeof(u64);
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alpha = Color::Convert4To8((packed_alpha >> (4 * (x * subtile_width + y))) & 0xF);
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}
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u64_le subtile_data;
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memcpy(&subtile_data, subtile_ptr, sizeof(u64));
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return Math::MakeVec(SampleETC1Subtile(subtile_data, x, y),
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disable_alpha ? (u8)255 : alpha);
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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.SetDefaultStride();
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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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@ -0,0 +1,60 @@
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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/common_types.h"
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#include "common/vector_math.h"
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#include "video_core/pica.h"
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namespace Pica {
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namespace Texture {
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/// Returns the byte size of a 8*8 tile of the specified texture format.
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size_t CalculateTileSize(Pica::Regs::TextureFormat format);
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struct TextureInfo {
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PAddr physical_address;
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unsigned int width;
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unsigned int height;
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ptrdiff_t stride;
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Pica::Regs::TextureFormat format;
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static TextureInfo FromPicaRegister(const Pica::Regs::TextureConfig& config,
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const Pica::Regs::TextureFormat& format);
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/// Calculates stride from format and width, assuming that the entire texture is contiguous.
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void SetDefaultStride() {
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stride = Pica::Texture::CalculateTileSize(format) * (width / 8);
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}
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};
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/**
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* Lookup texel located at the given coordinates and return an RGBA vector of its color.
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* @param source Source pointer to read data from
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* @param x,y Texture coordinates to read from
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* @param info TextureInfo object describing the texture setup
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* @param disable_alpha This is used for debug widgets which use this method to display textures
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* without providing a good way to visualize alpha by themselves. If true, this will return 255 for
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* the alpha component, and either drop the information entirely or store it in an "unused" color
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* channel.
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* @todo Eventually we should get rid of the disable_alpha parameter.
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*/
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Math::Vec4<u8> LookupTexture(const u8* source, unsigned int x, unsigned int y,
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const TextureInfo& info, bool disable_alpha = false);
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/**
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* Looks up a texel from a single 8x8 texture tile.
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*
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* @param source Pointer to the beginning of the tile.
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* @param x, y In-tile coordinates to read from. Must be < 8.
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* @param info TextureInfo describing the texture format.
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* @param disable_alpha Used for debugging. Sets the result alpha to 255 and either discards the
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* real alpha or inserts it in an otherwise unused channel.
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*/
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Math::Vec4<u8> LookupTexelInTile(const u8* source, unsigned int x, unsigned int y,
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const TextureInfo& info, bool disable_alpha);
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} // namespace Texture
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} // namespace Pica
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