suyu/src/video_core/textures/decoders.h

// Copyright 2018 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#pragma once

#include <vector>
#include "common/common_types.h"
#include "video_core/textures/texture.h"

namespace Tegra::Texture {

// GOBSize constant. Calculated by 64 bytes in x multiplied by 8 y coords, represents
// an small rect of (64/bytes_per_pixel)X8.
inline std::size_t GetGOBSize() {
    return 512;
}

inline std::size_t GetGOBSizeShift() {
    return 9;
}

/// Unswizzles a swizzled texture without changing its format.
void UnswizzleTexture(u8* unswizzled_data, u8* address, u32 tile_size_x, u32 tile_size_y,
                      u32 bytes_per_pixel, u32 width, u32 height, u32 depth,
                      u32 block_height = TICEntry::DefaultBlockHeight,
                      u32 block_depth = TICEntry::DefaultBlockHeight, u32 width_spacing = 0);

/// Unswizzles a swizzled texture without changing its format.
std::vector<u8> UnswizzleTexture(u8* address, u32 tile_size_x, u32 tile_size_y, u32 bytes_per_pixel,
                                 u32 width, u32 height, u32 depth,
                                 u32 block_height = TICEntry::DefaultBlockHeight,
                                 u32 block_depth = TICEntry::DefaultBlockHeight,
                                 u32 width_spacing = 0);

/// Copies texture data from a buffer and performs swizzling/unswizzling as necessary.
void CopySwizzledData(u32 width, u32 height, u32 depth, u32 bytes_per_pixel,
                      u32 out_bytes_per_pixel, u8* swizzled_data, u8* unswizzled_data,
                      bool unswizzle, u32 block_height, u32 block_depth, u32 width_spacing);

/// Decodes an unswizzled texture into a A8R8G8B8 texture.
std::vector<u8> DecodeTexture(const std::vector<u8>& texture_data, TextureFormat format, u32 width,
                              u32 height);

/// This function calculates the correct size of a texture depending if it's tiled or not.
std::size_t CalculateSize(bool tiled, u32 bytes_per_pixel, u32 width, u32 height, u32 depth,
                          u32 block_height, u32 block_depth);

/// Copies an untiled subrectangle into a tiled surface.
void SwizzleSubrect(u32 subrect_width, u32 subrect_height, u32 source_pitch, u32 swizzled_width,
                    u32 bytes_per_pixel, u8* swizzled_data, u8* unswizzled_data, u32 block_height,
                    u32 offset_x, u32 offset_y);

/// Copies a tiled subrectangle into a linear surface.
void UnswizzleSubrect(u32 subrect_width, u32 subrect_height, u32 dest_pitch, u32 swizzled_width,
                      u32 bytes_per_pixel, u8* swizzled_data, u8* unswizzled_data, u32 block_height,
                      u32 offset_x, u32 offset_y);

void SwizzleKepler(u32 width, u32 height, u32 dst_x, u32 dst_y, u32 block_height,
                   std::size_t copy_size, const u8* source_data, u8* swizzle_data);

/// Obtains the offset of the gob for positions 'dst_x' & 'dst_y'
u64 GetGOBOffset(u32 width, u32 height, u32 dst_x, u32 dst_y, u32 block_height,
                 u32 bytes_per_pixel);

} // namespace Tegra::Texture