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Standarized Legacy Swizzle to look alike FastSwizzle and use a Swizzling Table instead
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1 changed files with 40 additions and 44 deletions
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@ -13,53 +13,20 @@
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namespace Tegra::Texture {
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/**
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* This table represents the internal swizzle of a gob,
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* in format 16 bytes x 2 sector packing.
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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 Technical Reference Manual. pages 1187-1188
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*/
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static u32 GetSwizzleOffset(u32 x, u32 y, u32 bytes_per_pixel, u32 gob_address) {
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// Round up to the next gob
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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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std::array<u8*, 2> data_ptrs;
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const u32 stride = width * bytes_per_pixel;
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const u32 gobs_in_x = 64;
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const u32 gobs_in_y = 8;
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const u32 gobs_size = gobs_in_x * gobs_in_y;
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const u32 image_width_in_gobs{(stride + gobs_in_x - 1) / gobs_in_x};
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for (unsigned y = 0; y < height; ++y) {
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const u32 gob_y_address =
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(y / (gobs_in_y * block_height)) * gobs_size * block_height * image_width_in_gobs +
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(y % (gobs_in_y * block_height) / gobs_in_y) * gobs_size;
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for (unsigned x = 0; x < width; ++x) {
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const u32 gob_address =
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gob_y_address + (x * bytes_per_pixel / gobs_in_x) * gobs_size * block_height;
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const u32 swizzle_offset = GetSwizzleOffset(x, y, bytes_per_pixel, gob_address);
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const 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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// This table represents the internal swizzle of a gob.
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template <std::size_t N, std::size_t M>
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template <std::size_t N, std::size_t M, u32 Align>
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struct alignas(64) SwizzleTable {
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static_assert(M * Align == 64, "Swizzle Table does not align to GOB");
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constexpr SwizzleTable() {
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for (u32 y = 0; y < N; ++y) {
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for (u32 x = 0; x < M; ++x) {
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const u32 x2 = x * 16;
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const u32 x2 = x * Align;
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values[y][x] = static_cast<u16>(((x2 % 64) / 32) * 256 + ((y % 8) / 2) * 64 +
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((x2 % 32) / 16) * 32 + (y % 2) * 16);
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((x2 % 32) / 16) * 32 + (y % 2) * 16 + (x2 % 16));
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}
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}
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}
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@ -69,10 +36,39 @@ struct alignas(64) SwizzleTable {
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std::array<std::array<u16, M>, N> values{};
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};
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constexpr auto swizzle_table = SwizzleTable<8, 4>();
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constexpr auto legacy_swizzle_table = SwizzleTable<8, 64, 1>();
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constexpr auto fast_swizzle_table = SwizzleTable<8, 4, 16>();
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void FastSwizzleData(u32 width, u32 height, u32 bytes_per_pixel, u32 out_bytes_per_pixel, u8* swizzled_data,
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u8* unswizzled_data, bool unswizzle, u32 block_height) {
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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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std::array<u8*, 2> data_ptrs;
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const std::size_t stride = width * bytes_per_pixel;
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const std::size_t gobs_in_x = 64;
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const std::size_t gobs_in_y = 8;
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const std::size_t gobs_size = gobs_in_x * gobs_in_y;
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const std::size_t image_width_in_gobs{(stride + gobs_in_x - 1) / gobs_in_x};
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for (std::size_t y = 0; y < height; ++y) {
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const std::size_t gob_y_address =
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(y / (gobs_in_y * block_height)) * gobs_size * block_height * image_width_in_gobs +
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(y % (gobs_in_y * block_height) / gobs_in_y) * gobs_size;
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const auto& table = legacy_swizzle_table[y % gobs_in_y];
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for (std::size_t x = 0; x < width; ++x) {
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const std::size_t gob_address =
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gob_y_address + (x * bytes_per_pixel / gobs_in_x) * gobs_size * block_height;
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const std::size_t x2 = x * bytes_per_pixel;
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const std::size_t swizzle_offset = gob_address + table[x2 % gobs_in_x];
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const std::size_t 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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void FastSwizzleData(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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std::array<u8*, 2> data_ptrs;
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const std::size_t stride{width * bytes_per_pixel};
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const std::size_t gobs_in_x = 64;
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@ -85,13 +81,13 @@ void FastSwizzleData(u32 width, u32 height, u32 bytes_per_pixel, u32 out_bytes_p
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(y / (gobs_in_y * block_height)) * gobs_size * block_height * image_width_in_gobs +
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(y % (gobs_in_y * block_height) / gobs_in_y) * gobs_size;
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const std::size_t pixel_base{y * width * out_bytes_per_pixel};
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const auto& table = swizzle_table[y % gobs_in_y];
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const auto& table = fast_swizzle_table[y % gobs_in_y];
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for (std::size_t xb = 0; xb < stride; xb += copy_size) {
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const std::size_t truncated_copy = std::min(copy_size, stride - xb);
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const std::size_t gob_address{initial_gob +
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(xb / gobs_in_x) * gobs_size * block_height};
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const std::size_t swizzle_offset{gob_address + table[(xb / 16) % 4]};
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const std::size_t out_x = xb*out_bytes_per_pixel / bytes_per_pixel;
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const std::size_t out_x = xb * out_bytes_per_pixel / bytes_per_pixel;
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const std::size_t pixel_index{out_x + pixel_base};
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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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