From c74787a11c44bd1fa444425d36ac3049dffe1496 Mon Sep 17 00:00:00 2001 From: Yuri Kunde Schlesner Date: Fri, 6 Jan 2017 01:59:34 -0200 Subject: [PATCH] Pica/Texture: Move part of ETC1 decoding to new file and cleanups --- src/video_core/CMakeLists.txt | 2 + src/video_core/texture/etc1.cpp | 124 +++++++++++++++++++++ src/video_core/texture/etc1.h | 16 +++ src/video_core/texture/texture_decode.cpp | 125 +++------------------- 4 files changed, 158 insertions(+), 109 deletions(-) create mode 100644 src/video_core/texture/etc1.cpp create mode 100644 src/video_core/texture/etc1.h diff --git a/src/video_core/CMakeLists.txt b/src/video_core/CMakeLists.txt index ecb424cfd..ad984cd94 100644 --- a/src/video_core/CMakeLists.txt +++ b/src/video_core/CMakeLists.txt @@ -15,6 +15,7 @@ set(SRCS shader/shader.cpp shader/shader_interpreter.cpp swrasterizer.cpp + texture/etc1.cpp texture/texture_decode.cpp vertex_loader.cpp video_core.cpp @@ -44,6 +45,7 @@ set(HEADERS shader/shader.h shader/shader_interpreter.h swrasterizer.h + texture/etc1.h texture/texture_decode.h utils.h vertex_loader.h diff --git a/src/video_core/texture/etc1.cpp b/src/video_core/texture/etc1.cpp new file mode 100644 index 000000000..af60cde1e --- /dev/null +++ b/src/video_core/texture/etc1.cpp @@ -0,0 +1,124 @@ +// Copyright 2017 Citra Emulator Project +// Licensed under GPLv2 or any later version +// Refer to the license.txt file included. + +#pragma once + +#include +#include "common/bit_field.h" +#include "common/color.h" +#include "common/common_types.h" +#include "common/math_util.h" +#include "common/vector_math.h" +#include "video_core/texture/etc1.h" + +namespace Pica { +namespace Texture { + +namespace { + +constexpr std::array etc1_modifier_table = {{ + {2, 8}, {5, 17}, {9, 29}, {13, 42}, {18, 60}, {24, 80}, {33, 106}, {47, 183}, +}}; + +union ETC1Tile { + u64 raw; + + // Each of these two is a collection of 16 bits (one per lookup value) + BitField<0, 16, u64> table_subindexes; + BitField<16, 16, u64> negation_flags; + + unsigned GetTableSubIndex(unsigned index) const { + return (table_subindexes >> index) & 1; + } + + bool GetNegationFlag(unsigned index) const { + return ((negation_flags >> index) & 1) == 1; + } + + BitField<32, 1, u64> flip; + BitField<33, 1, u64> differential_mode; + + BitField<34, 3, u64> table_index_2; + BitField<37, 3, u64> table_index_1; + + union { + // delta value + base value + BitField<40, 3, s64> db; + BitField<43, 5, u64> b; + + BitField<48, 3, s64> dg; + BitField<51, 5, u64> g; + + BitField<56, 3, s64> dr; + BitField<59, 5, u64> r; + } differential; + + union { + BitField<40, 4, u64> b2; + BitField<44, 4, u64> b1; + + BitField<48, 4, u64> g2; + BitField<52, 4, u64> g1; + + BitField<56, 4, u64> r2; + BitField<60, 4, u64> r1; + } separate; + + const Math::Vec3 GetRGB(unsigned int x, unsigned int y) const { + int texel = 4 * x + y; + + if (flip) + std::swap(x, y); + + // Lookup base value + Math::Vec3 ret; + if (differential_mode) { + ret.r() = static_cast(differential.r); + ret.g() = static_cast(differential.g); + ret.b() = static_cast(differential.b); + if (x >= 2) { + ret.r() += static_cast(differential.dr); + ret.g() += static_cast(differential.dg); + ret.b() += static_cast(differential.db); + } + ret.r() = Color::Convert5To8(ret.r()); + ret.g() = Color::Convert5To8(ret.g()); + ret.b() = Color::Convert5To8(ret.b()); + } else { + if (x < 2) { + ret.r() = Color::Convert4To8(static_cast(separate.r1)); + ret.g() = Color::Convert4To8(static_cast(separate.g1)); + ret.b() = Color::Convert4To8(static_cast(separate.b1)); + } else { + ret.r() = Color::Convert4To8(static_cast(separate.r2)); + ret.g() = Color::Convert4To8(static_cast(separate.g2)); + ret.b() = Color::Convert4To8(static_cast(separate.b2)); + } + } + + // Add modifier + unsigned table_index = + static_cast((x < 2) ? table_index_1.Value() : table_index_2.Value()); + + int modifier = etc1_modifier_table[table_index][GetTableSubIndex(texel)]; + if (GetNegationFlag(texel)) + modifier *= -1; + + ret.r() = MathUtil::Clamp(ret.r() + modifier, 0, 255); + ret.g() = MathUtil::Clamp(ret.g() + modifier, 0, 255); + ret.b() = MathUtil::Clamp(ret.b() + modifier, 0, 255); + + return ret.Cast(); + } +}; + +} // anonymous namespace + +Math::Vec3 SampleETC1Subtile(u64 value, unsigned int x, unsigned int y) { + ETC1Tile tile{value}; + return tile.GetRGB(x, y); +} + +} // namespace Texture +} // namespace Pica diff --git a/src/video_core/texture/etc1.h b/src/video_core/texture/etc1.h new file mode 100644 index 000000000..e188b19df --- /dev/null +++ b/src/video_core/texture/etc1.h @@ -0,0 +1,16 @@ +// Copyright 2017 Citra Emulator Project +// Licensed under GPLv2 or any later version +// Refer to the license.txt file included. + +#pragma once + +#include "common/common_types.h" +#include "common/vector_math.h" + +namespace Pica { +namespace Texture { + +Math::Vec3 SampleETC1Subtile(u64 value, unsigned int x, unsigned int y); + +} // namespace Texture +} // namespace Pica diff --git a/src/video_core/texture/texture_decode.cpp b/src/video_core/texture/texture_decode.cpp index f13d6e577..f611a1aa9 100644 --- a/src/video_core/texture/texture_decode.cpp +++ b/src/video_core/texture/texture_decode.cpp @@ -8,8 +8,10 @@ #include "common/color.h" #include "common/logging/log.h" #include "common/math_util.h" +#include "common/swap.h" #include "common/vector_math.h" #include "video_core/pica.h" +#include "video_core/texture/etc1.h" #include "video_core/texture/texture_decode.h" #include "video_core/utils.h" @@ -177,127 +179,32 @@ Math::Vec4 LookupTexelInTile(const u8* source, unsigned int x, unsigned int case Regs::TextureFormat::ETC1: case Regs::TextureFormat::ETC1A4: { bool has_alpha = (info.format == Regs::TextureFormat::ETC1A4); + size_t subtile_size = has_alpha ? 16 : 8; // ETC1 further subdivides each 8x8 tile into four 4x4 subtiles constexpr unsigned int subtile_width = 4; constexpr unsigned int subtile_height = 4; unsigned int subtile_index = (x / subtile_width) + 2 * (y / subtile_height); - size_t subtile_size = has_alpha ? 16 : 8; + x %= subtile_width; + y %= subtile_height; - // TODO(yuriks): Use memcpy instead of reinterpret_cast - const u64* source_ptr = reinterpret_cast(source + subtile_index * subtile_size); + const u8* subtile_ptr = source + subtile_index * subtile_size; - u64 alpha = 0xFFFFFFFFFFFFFFFF; + u8 alpha = 255; if (has_alpha) { - alpha = *source_ptr; - source_ptr++; + u64_le packed_alpha; + memcpy(&packed_alpha, subtile_ptr, sizeof(u64)); + subtile_ptr += sizeof(u64); + + alpha = Color::Convert4To8((packed_alpha >> (4 * (x * subtile_width + y))) & 0xF); } - union ETC1Tile { - // Each of these two is a collection of 16 bits (one per lookup value) - BitField<0, 16, u64> table_subindexes; - BitField<16, 16, u64> negation_flags; + u64_le subtile_data; + memcpy(&subtile_data, subtile_ptr, sizeof(u64)); - unsigned GetTableSubIndex(unsigned index) const { - return (table_subindexes >> index) & 1; - } - - bool GetNegationFlag(unsigned index) const { - return ((negation_flags >> index) & 1) == 1; - } - - BitField<32, 1, u64> flip; - BitField<33, 1, u64> differential_mode; - - BitField<34, 3, u64> table_index_2; - BitField<37, 3, u64> table_index_1; - - union { - // delta value + base value - BitField<40, 3, s64> db; - BitField<43, 5, u64> b; - - BitField<48, 3, s64> dg; - BitField<51, 5, u64> g; - - BitField<56, 3, s64> dr; - BitField<59, 5, u64> r; - } differential; - - union { - BitField<40, 4, u64> b2; - BitField<44, 4, u64> b1; - - BitField<48, 4, u64> g2; - BitField<52, 4, u64> g1; - - BitField<56, 4, u64> r2; - BitField<60, 4, u64> r1; - } separate; - - const Math::Vec3 GetRGB(int x, int y) const { - int texel = 4 * x + y; - - if (flip) - std::swap(x, y); - - // Lookup base value - Math::Vec3 ret; - if (differential_mode) { - ret.r() = static_cast(differential.r); - ret.g() = static_cast(differential.g); - ret.b() = static_cast(differential.b); - if (x >= 2) { - ret.r() += static_cast(differential.dr); - ret.g() += static_cast(differential.dg); - ret.b() += static_cast(differential.db); - } - ret.r() = Color::Convert5To8(ret.r()); - ret.g() = Color::Convert5To8(ret.g()); - ret.b() = Color::Convert5To8(ret.b()); - } else { - if (x < 2) { - ret.r() = Color::Convert4To8(static_cast(separate.r1)); - ret.g() = Color::Convert4To8(static_cast(separate.g1)); - ret.b() = Color::Convert4To8(static_cast(separate.b1)); - } else { - ret.r() = Color::Convert4To8(static_cast(separate.r2)); - ret.g() = Color::Convert4To8(static_cast(separate.g2)); - ret.b() = Color::Convert4To8(static_cast(separate.b2)); - } - } - - // Add modifier - unsigned table_index = - static_cast((x < 2) ? table_index_1.Value() : table_index_2.Value()); - - static const std::array, 8> etc1_modifier_table = {{ - {{2, 8}}, - {{5, 17}}, - {{9, 29}}, - {{13, 42}}, - {{18, 60}}, - {{24, 80}}, - {{33, 106}}, - {{47, 183}}, - }}; - - int modifier = etc1_modifier_table.at(table_index).at(GetTableSubIndex(texel)); - if (GetNegationFlag(texel)) - modifier *= -1; - - ret.r() = MathUtil::Clamp(ret.r() + modifier, 0, 255); - ret.g() = MathUtil::Clamp(ret.g() + modifier, 0, 255); - ret.b() = MathUtil::Clamp(ret.b() + modifier, 0, 255); - - return ret.Cast(); - } - } const* etc1_tile = reinterpret_cast(source_ptr); - - alpha >>= 4 * ((x & 3) * 4 + (y & 3)); - return Math::MakeVec(etc1_tile->GetRGB(x & 3, y & 3), - disable_alpha ? (u8)255 : Color::Convert4To8(alpha & 0xF)); + return Math::MakeVec(SampleETC1Subtile(subtile_data, x, y), + disable_alpha ? (u8)255 : alpha); } default: