diff options
Diffstat (limited to 'src/video_core/texture')
| -rw-r--r-- | src/video_core/texture/texture_decode.cpp | 270 | ||||
| -rw-r--r-- | src/video_core/texture/texture_decode.h | 40 |
2 files changed, 310 insertions, 0 deletions
diff --git a/src/video_core/texture/texture_decode.cpp b/src/video_core/texture/texture_decode.cpp new file mode 100644 index 000000000..a3b05fe81 --- /dev/null +++ b/src/video_core/texture/texture_decode.cpp @@ -0,0 +1,270 @@ +// Copyright 2017 Citra Emulator Project +// Licensed under GPLv2 or any later version +// Refer to the license.txt file included. + +#pragma once + +#include "common/assert.h" +#include "common/color.h" +#include "common/logging/log.h" +#include "common/math_util.h" +#include "common/vector_math.h" +#include "video_core/texture/texture_decode.h" +#include "video_core/utils.h" + +namespace Pica { +namespace Texture { + +Math::Vec4<u8> LookupTexture(const u8* source, int x, int y, const TextureInfo& info, + bool disable_alpha) { + const unsigned int coarse_x = x & ~7; + const unsigned int coarse_y = y & ~7; + + if (info.format != Regs::TextureFormat::ETC1 && info.format != Regs::TextureFormat::ETC1A4) { + // TODO(neobrain): Fix code design to unify vertical block offsets! + source += coarse_y * info.stride; + } + + // TODO: Assert that width/height are multiples of block dimensions + + switch (info.format) { + case Regs::TextureFormat::RGBA8: { + auto res = Color::DecodeRGBA8(source + VideoCore::GetMortonOffset(x, y, 4)); + return {res.r(), res.g(), res.b(), static_cast<u8>(disable_alpha ? 255 : res.a())}; + } + + case Regs::TextureFormat::RGB8: { + auto res = Color::DecodeRGB8(source + VideoCore::GetMortonOffset(x, y, 3)); + return {res.r(), res.g(), res.b(), 255}; + } + + case Regs::TextureFormat::RGB5A1: { + auto res = Color::DecodeRGB5A1(source + VideoCore::GetMortonOffset(x, y, 2)); + return {res.r(), res.g(), res.b(), static_cast<u8>(disable_alpha ? 255 : res.a())}; + } + + case Regs::TextureFormat::RGB565: { + auto res = Color::DecodeRGB565(source + VideoCore::GetMortonOffset(x, y, 2)); + return {res.r(), res.g(), res.b(), 255}; + } + + case Regs::TextureFormat::RGBA4: { + auto res = Color::DecodeRGBA4(source + VideoCore::GetMortonOffset(x, y, 2)); + return {res.r(), res.g(), res.b(), static_cast<u8>(disable_alpha ? 255 : res.a())}; + } + + case Regs::TextureFormat::IA8: { + const u8* source_ptr = source + VideoCore::GetMortonOffset(x, y, 2); + + if (disable_alpha) { + // Show intensity as red, alpha as green + return {source_ptr[1], source_ptr[0], 0, 255}; + } else { + return {source_ptr[1], source_ptr[1], source_ptr[1], source_ptr[0]}; + } + } + + case Regs::TextureFormat::RG8: { + auto res = Color::DecodeRG8(source + VideoCore::GetMortonOffset(x, y, 2)); + return {res.r(), res.g(), 0, 255}; + } + + case Regs::TextureFormat::I8: { + const u8* source_ptr = source + VideoCore::GetMortonOffset(x, y, 1); + return {*source_ptr, *source_ptr, *source_ptr, 255}; + } + + case Regs::TextureFormat::A8: { + const u8* source_ptr = source + VideoCore::GetMortonOffset(x, y, 1); + + if (disable_alpha) { + return {*source_ptr, *source_ptr, *source_ptr, 255}; + } else { + return {0, 0, 0, *source_ptr}; + } + } + + case Regs::TextureFormat::IA4: { + const u8* source_ptr = source + VideoCore::GetMortonOffset(x, y, 1); + + u8 i = Color::Convert4To8(((*source_ptr) & 0xF0) >> 4); + u8 a = Color::Convert4To8((*source_ptr) & 0xF); + + if (disable_alpha) { + // Show intensity as red, alpha as green + return {i, a, 0, 255}; + } else { + return {i, i, i, a}; + } + } + + case Regs::TextureFormat::I4: { + u32 morton_offset = VideoCore::GetMortonOffset(x, y, 1); + const u8* source_ptr = source + morton_offset / 2; + + u8 i = (morton_offset % 2) ? ((*source_ptr & 0xF0) >> 4) : (*source_ptr & 0xF); + i = Color::Convert4To8(i); + + return {i, i, i, 255}; + } + + case Regs::TextureFormat::A4: { + u32 morton_offset = VideoCore::GetMortonOffset(x, y, 1); + const u8* source_ptr = source + morton_offset / 2; + + u8 a = (morton_offset % 2) ? ((*source_ptr & 0xF0) >> 4) : (*source_ptr & 0xF); + a = Color::Convert4To8(a); + + if (disable_alpha) { + return {a, a, a, 255}; + } else { + return {0, 0, 0, a}; + } + } + + case Regs::TextureFormat::ETC1: + case Regs::TextureFormat::ETC1A4: { + bool has_alpha = (info.format == Regs::TextureFormat::ETC1A4); + + // ETC1 further subdivides each 8x8 tile into four 4x4 subtiles + const int subtile_width = 4; + const int subtile_height = 4; + + int subtile_index = ((x / subtile_width) & 1) + 2 * ((y / subtile_height) & 1); + unsigned subtile_bytes = has_alpha ? 2 : 1; // TODO: Name... + + const u64* source_ptr = (const u64*)(source + coarse_x * subtile_bytes * 4 + + coarse_y * subtile_bytes * 4 * (info.width / 8) + + subtile_index * subtile_bytes * 8); + u64 alpha = 0xFFFFFFFFFFFFFFFF; + if (has_alpha) { + alpha = *source_ptr; + source_ptr++; + } + + 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; + + 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<u8> GetRGB(int x, int y) const { + int texel = 4 * x + y; + + if (flip) + std::swap(x, y); + + // Lookup base value + Math::Vec3<int> ret; + if (differential_mode) { + ret.r() = static_cast<int>(differential.r); + ret.g() = static_cast<int>(differential.g); + ret.b() = static_cast<int>(differential.b); + if (x >= 2) { + ret.r() += static_cast<int>(differential.dr); + ret.g() += static_cast<int>(differential.dg); + ret.b() += static_cast<int>(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<u8>(separate.r1)); + ret.g() = Color::Convert4To8(static_cast<u8>(separate.g1)); + ret.b() = Color::Convert4To8(static_cast<u8>(separate.b1)); + } else { + ret.r() = Color::Convert4To8(static_cast<u8>(separate.r2)); + ret.g() = Color::Convert4To8(static_cast<u8>(separate.g2)); + ret.b() = Color::Convert4To8(static_cast<u8>(separate.b2)); + } + } + + // Add modifier + unsigned table_index = + static_cast<int>((x < 2) ? table_index_1.Value() : table_index_2.Value()); + + static const std::array<std::array<u8, 2>, 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<u8>(); + } + } const* etc1_tile = reinterpret_cast<const ETC1Tile*>(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)); + } + + default: + LOG_ERROR(HW_GPU, "Unknown texture format: %x", (u32)info.format); + DEBUG_ASSERT(false); + return {}; + } +} + +TextureInfo TextureInfo::FromPicaRegister(const Regs::TextureConfig& config, + const Regs::TextureFormat& format) { + TextureInfo info; + info.physical_address = config.GetPhysicalAddress(); + info.width = config.width; + info.height = config.height; + info.format = format; + info.stride = Pica::Regs::NibblesPerPixel(info.format) * info.width / 2; + return info; +} + +} // namespace Texture +} // namespace Pica diff --git a/src/video_core/texture/texture_decode.h b/src/video_core/texture/texture_decode.h new file mode 100644 index 000000000..0c1438b0f --- /dev/null +++ b/src/video_core/texture/texture_decode.h @@ -0,0 +1,40 @@ +// 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" +#include "video_core/pica.h" + +namespace Pica { +namespace Texture { + +struct TextureInfo { + PAddr physical_address; + int width; + int height; + int stride; + Pica::Regs::TextureFormat format; + + static TextureInfo FromPicaRegister(const Pica::Regs::TextureConfig& config, + const Pica::Regs::TextureFormat& format); +}; + +/** + * Lookup texel located at the given coordinates and return an RGBA vector of its color. + * @param source Source pointer to read data from + * @param s,t Texture coordinates to read from + * @param info TextureInfo object describing the texture setup + * @param disable_alpha This is used for debug widgets which use this method to display textures + * without providing a good way to visualize alpha by themselves. If true, this will return 255 for + * the alpha component, and either drop the information entirely or store it in an "unused" color + * channel. + * @todo Eventually we should get rid of the disable_alpha parameter. + */ +Math::Vec4<u8> LookupTexture(const u8* source, int s, int t, const TextureInfo& info, + bool disable_alpha = false); + +} // namespace Texture +} // namespace Pica |