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// Copyright 2018 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <cstring>
#include "common/assert.h"
#include "video_core/textures/decoders.h"
#include "video_core/textures/texture.h"
namespace Tegra {
namespace Texture {
/**
* Calculates the offset of an (x, y) position within a swizzled texture.
* Taken from the Tegra X1 TRM.
*/
static u32 GetSwizzleOffset(u32 x, u32 y, u32 image_width, u32 bytes_per_pixel, u32 block_height) {
u32 image_width_in_gobs = image_width * bytes_per_pixel / 64;
u32 GOB_address = 0 + (y / (8 * block_height)) * 512 * block_height * image_width_in_gobs +
(x * bytes_per_pixel / 64) * 512 * block_height +
(y % (8 * block_height) / 8) * 512;
x *= bytes_per_pixel;
u32 address = GOB_address + ((x % 64) / 32) * 256 + ((y % 8) / 2) * 64 + ((x % 32) / 16) * 32 +
(y % 2) * 16 + (x % 16);
return address;
}
static void CopySwizzledData(u32 width, u32 height, u32 bytes_per_pixel, u32 out_bytes_per_pixel,
u8* swizzled_data, u8* unswizzled_data, bool unswizzle,
u32 block_height) {
u8* data_ptrs[2];
for (unsigned y = 0; y < height; ++y) {
for (unsigned x = 0; x < width; ++x) {
u32 swizzle_offset = GetSwizzleOffset(x, y, width, bytes_per_pixel, block_height);
u32 pixel_index = (x + y * width) * out_bytes_per_pixel;
data_ptrs[unswizzle] = swizzled_data + swizzle_offset;
data_ptrs[!unswizzle] = &unswizzled_data[pixel_index];
std::memcpy(data_ptrs[0], data_ptrs[1], bytes_per_pixel);
}
}
}
u32 BytesPerPixel(TextureFormat format) {
switch (format) {
case TextureFormat::DXT1:
// In this case a 'pixel' actually refers to a 4x4 tile.
return 8;
case TextureFormat::DXT23:
case TextureFormat::DXT45:
// In this case a 'pixel' actually refers to a 4x4 tile.
return 16;
case TextureFormat::A8R8G8B8:
return 4;
case TextureFormat::B5G6R5:
return 2;
default:
UNIMPLEMENTED_MSG("Format not implemented");
break;
}
}
std::vector<u8> UnswizzleTexture(VAddr address, TextureFormat format, u32 width, u32 height,
u32 block_height) {
u8* data = Memory::GetPointer(address);
u32 bytes_per_pixel = BytesPerPixel(format);
std::vector<u8> unswizzled_data(width * height * bytes_per_pixel);
switch (format) {
case TextureFormat::DXT1:
case TextureFormat::DXT23:
case TextureFormat::DXT45:
// In the DXT formats, each 4x4 tile is swizzled instead of just individual pixel values.
CopySwizzledData(width / 4, height / 4, bytes_per_pixel, bytes_per_pixel, data,
unswizzled_data.data(), true, block_height);
break;
case TextureFormat::A8R8G8B8:
case TextureFormat::B5G6R5:
CopySwizzledData(width, height, bytes_per_pixel, bytes_per_pixel, data,
unswizzled_data.data(), true, block_height);
break;
default:
UNIMPLEMENTED_MSG("Format not implemented");
break;
}
return unswizzled_data;
}
std::vector<u8> DecodeTexture(const std::vector<u8>& texture_data, TextureFormat format, u32 width,
u32 height) {
std::vector<u8> rgba_data;
// TODO(Subv): Implement.
switch (format) {
case TextureFormat::DXT1:
case TextureFormat::DXT23:
case TextureFormat::DXT45:
case TextureFormat::A8R8G8B8:
case TextureFormat::B5G6R5:
// TODO(Subv): For the time being just forward the same data without any decoding.
rgba_data = texture_data;
break;
default:
UNIMPLEMENTED_MSG("Format not implemented");
break;
}
return rgba_data;
}
} // namespace Texture
} // namespace Tegra
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