forked from eden-emu/eden
126 lines
4.2 KiB
C++
126 lines
4.2 KiB
C++
// Copyright 2018 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <cstring>
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#include "common/assert.h"
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#include "core/memory.h"
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#include "video_core/textures/decoders.h"
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#include "video_core/textures/texture.h"
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namespace Tegra {
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namespace Texture {
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/**
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* Calculates the offset of an (x, y) position within a swizzled texture.
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* Taken from the Tegra X1 TRM.
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*/
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static u32 GetSwizzleOffset(u32 x, u32 y, u32 image_width, u32 bytes_per_pixel, u32 block_height) {
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u32 image_width_in_gobs = image_width * bytes_per_pixel / 64;
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u32 GOB_address = 0 + (y / (8 * block_height)) * 512 * block_height * image_width_in_gobs +
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(x * bytes_per_pixel / 64) * 512 * block_height +
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(y % (8 * block_height) / 8) * 512;
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x *= bytes_per_pixel;
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u32 address = GOB_address + ((x % 64) / 32) * 256 + ((y % 8) / 2) * 64 + ((x % 32) / 16) * 32 +
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(y % 2) * 16 + (x % 16);
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return address;
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}
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void CopySwizzledData(u32 width, u32 height, u32 bytes_per_pixel, u32 out_bytes_per_pixel,
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u8* swizzled_data, u8* unswizzled_data, bool unswizzle, u32 block_height) {
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u8* data_ptrs[2];
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for (unsigned y = 0; y < height; ++y) {
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for (unsigned x = 0; x < width; ++x) {
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u32 swizzle_offset = GetSwizzleOffset(x, y, width, bytes_per_pixel, block_height);
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u32 pixel_index = (x + y * width) * out_bytes_per_pixel;
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data_ptrs[unswizzle] = swizzled_data + swizzle_offset;
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data_ptrs[!unswizzle] = &unswizzled_data[pixel_index];
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std::memcpy(data_ptrs[0], data_ptrs[1], bytes_per_pixel);
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}
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}
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}
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u32 BytesPerPixel(TextureFormat format) {
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switch (format) {
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case TextureFormat::DXT1:
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// In this case a 'pixel' actually refers to a 4x4 tile.
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return 8;
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case TextureFormat::DXT23:
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case TextureFormat::DXT45:
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// In this case a 'pixel' actually refers to a 4x4 tile.
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return 16;
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case TextureFormat::A8R8G8B8:
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case TextureFormat::A2B10G10R10:
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return 4;
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case TextureFormat::A1B5G5R5:
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case TextureFormat::B5G6R5:
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return 2;
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case TextureFormat::R8:
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return 1;
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default:
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UNIMPLEMENTED_MSG("Format not implemented");
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break;
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}
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}
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std::vector<u8> UnswizzleTexture(VAddr address, TextureFormat format, u32 width, u32 height,
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u32 block_height) {
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u8* data = Memory::GetPointer(address);
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u32 bytes_per_pixel = BytesPerPixel(format);
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std::vector<u8> unswizzled_data(width * height * bytes_per_pixel);
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switch (format) {
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case TextureFormat::DXT1:
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case TextureFormat::DXT23:
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case TextureFormat::DXT45:
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// In the DXT formats, each 4x4 tile is swizzled instead of just individual pixel values.
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CopySwizzledData(width / 4, height / 4, bytes_per_pixel, bytes_per_pixel, data,
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unswizzled_data.data(), true, block_height);
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break;
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case TextureFormat::A8R8G8B8:
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case TextureFormat::A2B10G10R10:
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case TextureFormat::A1B5G5R5:
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case TextureFormat::B5G6R5:
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case TextureFormat::R8:
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CopySwizzledData(width, height, bytes_per_pixel, bytes_per_pixel, data,
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unswizzled_data.data(), true, block_height);
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break;
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default:
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UNIMPLEMENTED_MSG("Format not implemented");
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break;
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}
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return unswizzled_data;
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}
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std::vector<u8> DecodeTexture(const std::vector<u8>& texture_data, TextureFormat format, u32 width,
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u32 height) {
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std::vector<u8> rgba_data;
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// TODO(Subv): Implement.
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switch (format) {
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case TextureFormat::DXT1:
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case TextureFormat::DXT23:
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case TextureFormat::DXT45:
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case TextureFormat::A8R8G8B8:
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case TextureFormat::A2B10G10R10:
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case TextureFormat::A1B5G5R5:
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case TextureFormat::B5G6R5:
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case TextureFormat::R8:
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// TODO(Subv): For the time being just forward the same data without any decoding.
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rgba_data = texture_data;
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break;
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default:
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UNIMPLEMENTED_MSG("Format not implemented");
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break;
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}
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return rgba_data;
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}
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} // namespace Texture
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} // namespace Tegra
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