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Improved Legacy Swizzler to be better documented and work better
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1 changed files with 21 additions and 15 deletions
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@ -14,17 +14,12 @@ namespace Tegra::Texture {
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/**
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/**
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* Calculates the offset of an (x, y) position within a swizzled texture.
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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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* Taken from the Tegra X1 Technical Reference Manual. pages 1187-1188
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*/
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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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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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// Round up to the next gob
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const u32 image_width_in_gobs{(image_width * bytes_per_pixel + 63) / 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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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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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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(y % 2) * 16 + (x % 16);
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return address;
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return address;
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@ -32,21 +27,31 @@ static u32 GetSwizzleOffset(u32 x, u32 y, u32 image_width, u32 bytes_per_pixel,
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void CopySwizzledData(u32 width, u32 height, u32 bytes_per_pixel, u32 out_bytes_per_pixel,
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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* swizzled_data, u8* unswizzled_data, bool unswizzle, u32 block_height) {
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u8* data_ptrs[2];
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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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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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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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const u32 gob_address =
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u32 pixel_index = (x + y * width) * out_bytes_per_pixel;
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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] = swizzled_data + swizzle_offset;
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data_ptrs[!unswizzle] = &unswizzled_data[pixel_index];
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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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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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}
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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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// 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>
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struct alignas(64) SwizzleTable {
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struct alignas(64) SwizzleTable {
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constexpr SwizzleTable() {
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constexpr SwizzleTable() {
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@ -72,7 +77,7 @@ void FastSwizzleData(u32 width, u32 height, u32 bytes_per_pixel, u8* swizzled_da
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const std::size_t stride{width * bytes_per_pixel};
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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_x = 64;
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const std::size_t gobs_in_y = 8;
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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 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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const std::size_t image_width_in_gobs{(stride + gobs_in_x - 1) / gobs_in_x};
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const std::size_t copy_size{16};
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const std::size_t copy_size{16};
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for (std::size_t y = 0; y < height; ++y) {
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for (std::size_t y = 0; y < height; ++y) {
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@ -83,7 +88,8 @@ void FastSwizzleData(u32 width, u32 height, u32 bytes_per_pixel, u8* swizzled_da
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const auto& table = swizzle_table[y % gobs_in_y];
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const auto& table = 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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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 truncated_copy = std::min(copy_size, stride - xb);
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const std::size_t gob_address{initial_gob + (xb / gobs_in_x) * gobs_size * block_height};
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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 swizzle_offset{gob_address + table[(xb / 16) % 4]};
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const std::size_t pixel_index{xb + pixel_base};
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const std::size_t pixel_index{xb + pixel_base};
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data_ptrs[unswizzle] = swizzled_data + swizzle_offset;
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data_ptrs[unswizzle] = swizzled_data + swizzle_offset;
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