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// Copyright 2017 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "common/assert.h"
#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/regs_texturing.h"
#include "video_core/texture/etc1.h"
#include "video_core/texture/texture_decode.h"
#include "video_core/utils.h"
using TextureFormat = Pica::TexturingRegs::TextureFormat;
namespace Pica {
namespace Texture {
constexpr size_t TILE_SIZE = 8 * 8;
constexpr size_t ETC1_SUBTILES = 2 * 2;
size_t CalculateTileSize(TextureFormat format) {
switch (format) {
case TextureFormat::RGBA8:
return 4 * TILE_SIZE;
case TextureFormat::RGB8:
return 3 * TILE_SIZE;
case TextureFormat::RGB5A1:
case TextureFormat::RGB565:
case TextureFormat::RGBA4:
case TextureFormat::IA8:
case TextureFormat::RG8:
return 2 * TILE_SIZE;
case TextureFormat::I8:
case TextureFormat::A8:
case TextureFormat::IA4:
return 1 * TILE_SIZE;
case TextureFormat::I4:
case TextureFormat::A4:
return TILE_SIZE / 2;
case TextureFormat::ETC1:
return ETC1_SUBTILES * 8;
case TextureFormat::ETC1A4:
return ETC1_SUBTILES * 16;
default: // placeholder for yet unknown formats
UNIMPLEMENTED();
return 0;
}
}
Math::Vec4<u8> LookupTexture(const u8* source, unsigned int x, unsigned int y,
const TextureInfo& info, bool disable_alpha) {
// Coordinate in tiles
const unsigned int coarse_x = x / 8;
const unsigned int coarse_y = y / 8;
// Coordinate inside the tile
const unsigned int fine_x = x % 8;
const unsigned int fine_y = y % 8;
const u8* line = source + coarse_y * info.stride;
const u8* tile = line + coarse_x * CalculateTileSize(info.format);
return LookupTexelInTile(tile, fine_x, fine_y, info, disable_alpha);
}
Math::Vec4<u8> LookupTexelInTile(const u8* source, unsigned int x, unsigned int y,
const TextureInfo& info, bool disable_alpha) {
DEBUG_ASSERT(x < 8);
DEBUG_ASSERT(y < 8);
using VideoCore::MortonInterleave;
switch (info.format) {
case TextureFormat::RGBA8: {
auto res = Color::DecodeRGBA8(source + MortonInterleave(x, y) * 4);
return {res.r(), res.g(), res.b(), static_cast<u8>(disable_alpha ? 255 : res.a())};
}
case TextureFormat::RGB8: {
auto res = Color::DecodeRGB8(source + MortonInterleave(x, y) * 3);
return {res.r(), res.g(), res.b(), 255};
}
case TextureFormat::RGB5A1: {
auto res = Color::DecodeRGB5A1(source + MortonInterleave(x, y) * 2);
return {res.r(), res.g(), res.b(), static_cast<u8>(disable_alpha ? 255 : res.a())};
}
case TextureFormat::RGB565: {
auto res = Color::DecodeRGB565(source + MortonInterleave(x, y) * 2);
return {res.r(), res.g(), res.b(), 255};
}
case TextureFormat::RGBA4: {
auto res = Color::DecodeRGBA4(source + MortonInterleave(x, y) * 2);
return {res.r(), res.g(), res.b(), static_cast<u8>(disable_alpha ? 255 : res.a())};
}
case TextureFormat::IA8: {
const u8* source_ptr = source + MortonInterleave(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 TextureFormat::RG8: {
auto res = Color::DecodeRG8(source + MortonInterleave(x, y) * 2);
return {res.r(), res.g(), 0, 255};
}
case TextureFormat::I8: {
const u8* source_ptr = source + MortonInterleave(x, y);
return {*source_ptr, *source_ptr, *source_ptr, 255};
}
case TextureFormat::A8: {
const u8* source_ptr = source + MortonInterleave(x, y);
if (disable_alpha) {
return {*source_ptr, *source_ptr, *source_ptr, 255};
} else {
return {0, 0, 0, *source_ptr};
}
}
case TextureFormat::IA4: {
const u8* source_ptr = source + MortonInterleave(x, y);
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 TextureFormat::I4: {
u32 morton_offset = MortonInterleave(x, y);
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 TextureFormat::A4: {
u32 morton_offset = MortonInterleave(x, y);
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 TextureFormat::ETC1:
case TextureFormat::ETC1A4: {
bool has_alpha = (info.format == 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);
x %= subtile_width;
y %= subtile_height;
const u8* subtile_ptr = source + subtile_index * subtile_size;
u8 alpha = 255;
if (has_alpha) {
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);
}
u64_le subtile_data;
memcpy(&subtile_data, subtile_ptr, sizeof(u64));
return Math::MakeVec(SampleETC1Subtile(subtile_data, x, y),
disable_alpha ? (u8)255 : alpha);
}
default:
LOG_ERROR(HW_GPU, "Unknown texture format: %x", (u32)info.format);
DEBUG_ASSERT(false);
return {};
}
}
TextureInfo TextureInfo::FromPicaRegister(const TexturingRegs::TextureConfig& config,
const TexturingRegs::TextureFormat& format) {
TextureInfo info;
info.physical_address = config.GetPhysicalAddress();
info.width = config.width;
info.height = config.height;
info.format = format;
info.SetDefaultStride();
return info;
}
} // namespace Texture
} // namespace Pica
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