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bcdec: Fix decompressing mipmaps of non-power-of-2 textures

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BlueCube3310
2025-02-25 12:18:41 +01:00
parent 8f78e7510d
commit 8402a1d0bd
1 changed files with 127 additions and 78 deletions
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205
modules/bcdec/image_decompress_bcdec.cpp
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@@ -44,110 +44,174 @@ inline void bcdec_bc6h_half_u(const void *compressedBlock, void *decompressedBlo
bcdec_bc6h_half(compressedBlock, decompressedBlock, destinationPitch, false);
}
template <void (*decompress_func)(const void *, void *, int), int block_size, int pixel_size, int component_size>
static inline void _safe_decompress_mipmap(int width, int height, const uint8_t *src, uint8_t *dst) {
// A stack-allocated output buffer large enough to contain an entire uncompressed block.
uint8_t temp_buf[4 * 4 * pixel_size];
// The amount of misaligned pixels on each axis.
const int width_diff = width - (width & ~0x03);
const int height_diff = height - (height & ~0x03);
// The amount of uncompressed blocks on each axis.
const int width_blocks = (width & ~0x03) / 4;
const int height_blocks = (height & ~0x03) / 4;
// The pitch of the image in bytes.
const int image_pitch = width * pixel_size;
// The pitch of a block in bytes.
const int block_pitch = 4 * pixel_size;
// The pitch of the last block in bytes.
const int odd_pitch = width_diff * pixel_size;
size_t src_pos = 0;
size_t dst_pos = 0;
// Decompress the blocks, starting from the top.
for (int y = 0; y < height_blocks; y += 1) {
// Decompress the blocks, starting from the left.
for (int x = 0; x < width_blocks; x += 1) {
decompress_func(&src[src_pos], &dst[dst_pos], image_pitch / component_size);
src_pos += block_size;
dst_pos += block_pitch;
}
// Decompress the block on the right.
if (width_diff > 0) {
decompress_func(&src[src_pos], temp_buf, block_pitch / component_size);
// Copy the data from the temporary buffer to the output.
for (int i = 0; i < 4; i++) {
memcpy(&dst[dst_pos + i * image_pitch], &temp_buf[i * block_pitch], odd_pitch);
}
src_pos += block_size;
dst_pos += odd_pitch;
}
// Skip to the next row of blocks, the current one has already been filled.
dst_pos += 3 * image_pitch;
}
// Decompress the blocks at the bottom of the image.
if (height_diff > 0) {
// Decompress the blocks at the bottom.
for (int x = 0; x < width_blocks; x += 1) {
decompress_func(&src[src_pos], temp_buf, block_pitch / component_size);
// Copy the data from the temporary buffer to the output.
for (int i = 0; i < height_diff; i++) {
memcpy(&dst[dst_pos + i * image_pitch], &temp_buf[i * block_pitch], block_pitch);
}
src_pos += block_size;
dst_pos += block_pitch;
}
// Decompress the block in the lower-right corner.
if (width_diff > 0) {
decompress_func(&src[src_pos], temp_buf, block_pitch / component_size);
// Copy the data from the temporary buffer to the output.
for (int i = 0; i < height_diff; i++) {
memcpy(&dst[dst_pos + i * image_pitch], &temp_buf[i * block_pitch], odd_pitch);
}
src_pos += block_size;
dst_pos += odd_pitch;
}
}
}
template <void (*decompress_func)(const void *, void *, int), int block_size, int pixel_size, int component_size>
static inline void _decompress_mipmap(int width, int height, const uint8_t *src, uint8_t *dst) {
size_t src_pos = 0;
size_t dst_pos = 0;
// The size of a single block in bytes.
const int block_pitch = 4 * pixel_size;
// The pitch of the image in bytes.
const int image_pitch = width * pixel_size;
for (int y = 0; y < height; y += 4) {
for (int x = 0; x < width; x += 4) {
decompress_func(&src[src_pos], &dst[dst_pos], image_pitch / component_size);
src_pos += block_size;
dst_pos += block_pitch;
}
// Skip to the next row of blocks, the current one has already been filled.
dst_pos += 3 * image_pitch;
}
}
static void decompress_image(BCdecFormat format, const void *src, void *dst, const uint64_t width, const uint64_t height) {
const uint8_t *src_blocks = reinterpret_cast<const uint8_t *>(src);
uint8_t *dec_blocks = reinterpret_cast<uint8_t *>(dst);
#define DECOMPRESS_LOOP(func, block_size, color_bytesize, color_components) \
for (uint64_t y = 0; y < height; y += 4) { \
for (uint64_t x = 0; x < width; x += 4) { \
func(&src_blocks[src_pos], &dec_blocks[dst_pos], width * color_components); \
src_pos += block_size; \
dst_pos += 4 * color_bytesize; \
} \
dst_pos += 3 * width * color_bytesize; \
}
#define DECOMPRESS_LOOP_SAFE(func, block_size, color_bytesize, color_components, output) \
for (uint64_t y = 0; y < height; y += 4) { \
for (uint64_t x = 0; x < width; x += 4) { \
const uint32_t yblock = MIN(height - y, 4ul); \
const uint32_t xblock = MIN(width - x, 4ul); \
\
const bool incomplete = yblock < 4 || xblock < 4; \
uint8_t *dec_out = incomplete ? output : &dec_blocks[y * 4 * width + x * color_bytesize]; \
\
func(&src_blocks[src_pos], dec_out, 4 * color_components); \
src_pos += block_size; \
\
if (incomplete) { \
for (uint32_t cy = 0; cy < yblock; cy++) { \
for (uint32_t cx = 0; cx < xblock; cx++) { \
memcpy(&dec_blocks[(y + cy) * 4 * width + (x + cx) * color_bytesize], &output[cy * 4 + cx * color_bytesize], color_bytesize); \
} \
} \
} \
} \
}
if (width % 4 != 0 || height % 4 != 0) {
uint64_t src_pos = 0;
uint8_t r8_output[4 * 4];
uint8_t rg8_output[4 * 4 * 2];
uint8_t rgba8_output[4 * 4 * 4];
uint8_t rgbh_output[4 * 4 * 6];
const uint64_t aligned_width = (width + 3) & ~0x03;
const uint64_t aligned_height = (height + 3) & ~0x03;
if (width != aligned_width || height != aligned_height) {
// Decompress the mipmap in a 'safe' way, which involves starting from the top left.
// For each block row, decompress all of the 'full' blocks, then the misaligned one (on the x axis).
// Then, decompress the final misaligned block row at the bottom.
// Finally, decompress the misaligned block at the bottom right.
switch (format) {
case BCdec_BC1: {
DECOMPRESS_LOOP_SAFE(bcdec_bc1, BCDEC_BC1_BLOCK_SIZE, 4, 4, rgba8_output)
_safe_decompress_mipmap<bcdec_bc1, BCDEC_BC1_BLOCK_SIZE, 4, 1>(width, height, src_blocks, dec_blocks);
} break;
case BCdec_BC2: {
DECOMPRESS_LOOP_SAFE(bcdec_bc2, BCDEC_BC2_BLOCK_SIZE, 4, 4, rgba8_output)
_safe_decompress_mipmap<bcdec_bc2, BCDEC_BC2_BLOCK_SIZE, 4, 1>(width, height, src_blocks, dec_blocks);
} break;
case BCdec_BC3: {
DECOMPRESS_LOOP_SAFE(bcdec_bc3, BCDEC_BC3_BLOCK_SIZE, 4, 4, rgba8_output)
_safe_decompress_mipmap<bcdec_bc3, BCDEC_BC3_BLOCK_SIZE, 4, 1>(width, height, src_blocks, dec_blocks);
} break;
case BCdec_BC4: {
DECOMPRESS_LOOP_SAFE(bcdec_bc4, BCDEC_BC4_BLOCK_SIZE, 1, 1, r8_output)
_safe_decompress_mipmap<bcdec_bc4, BCDEC_BC4_BLOCK_SIZE, 1, 1>(width, height, src_blocks, dec_blocks);
} break;
case BCdec_BC5: {
DECOMPRESS_LOOP_SAFE(bcdec_bc5, BCDEC_BC5_BLOCK_SIZE, 2, 2, rg8_output)
_safe_decompress_mipmap<bcdec_bc5, BCDEC_BC5_BLOCK_SIZE, 2, 1>(width, height, src_blocks, dec_blocks);
} break;
case BCdec_BC6U: {
DECOMPRESS_LOOP_SAFE(bcdec_bc6h_half_u, BCDEC_BC6H_BLOCK_SIZE, 6, 3, rgbh_output)
_safe_decompress_mipmap<bcdec_bc6h_half_u, BCDEC_BC6H_BLOCK_SIZE, 6, 2>(width, height, src_blocks, dec_blocks);
} break;
case BCdec_BC6S: {
DECOMPRESS_LOOP_SAFE(bcdec_bc6h_half_s, BCDEC_BC6H_BLOCK_SIZE, 6, 3, rgbh_output)
_safe_decompress_mipmap<bcdec_bc6h_half_s, BCDEC_BC6H_BLOCK_SIZE, 6, 2>(width, height, src_blocks, dec_blocks);
} break;
case BCdec_BC7: {
DECOMPRESS_LOOP_SAFE(bcdec_bc7, BCDEC_BC7_BLOCK_SIZE, 4, 4, rgba8_output)
_safe_decompress_mipmap<bcdec_bc7, BCDEC_BC7_BLOCK_SIZE, 4, 1>(width, height, src_blocks, dec_blocks);
} break;
}
} else {
uint64_t src_pos = 0, dst_pos = 0;
// Just decompress as usual, as fast as possible.
switch (format) {
case BCdec_BC1: {
DECOMPRESS_LOOP(bcdec_bc1, BCDEC_BC1_BLOCK_SIZE, 4, 4)
_decompress_mipmap<bcdec_bc1, BCDEC_BC1_BLOCK_SIZE, 4, 1>(width, height, src_blocks, dec_blocks);
} break;
case BCdec_BC2: {
DECOMPRESS_LOOP(bcdec_bc2, BCDEC_BC2_BLOCK_SIZE, 4, 4)
_decompress_mipmap<bcdec_bc2, BCDEC_BC2_BLOCK_SIZE, 4, 1>(width, height, src_blocks, dec_blocks);
} break;
case BCdec_BC3: {
DECOMPRESS_LOOP(bcdec_bc3, BCDEC_BC3_BLOCK_SIZE, 4, 4)
_decompress_mipmap<bcdec_bc3, BCDEC_BC3_BLOCK_SIZE, 4, 1>(width, height, src_blocks, dec_blocks);
} break;
case BCdec_BC4: {
DECOMPRESS_LOOP(bcdec_bc4, BCDEC_BC4_BLOCK_SIZE, 1, 1)
_decompress_mipmap<bcdec_bc4, BCDEC_BC4_BLOCK_SIZE, 1, 1>(width, height, src_blocks, dec_blocks);
} break;
case BCdec_BC5: {
DECOMPRESS_LOOP(bcdec_bc5, BCDEC_BC5_BLOCK_SIZE, 2, 2)
_decompress_mipmap<bcdec_bc5, BCDEC_BC5_BLOCK_SIZE, 2, 1>(width, height, src_blocks, dec_blocks);
} break;
case BCdec_BC6U: {
DECOMPRESS_LOOP(bcdec_bc6h_half_u, BCDEC_BC6H_BLOCK_SIZE, 6, 3)
_decompress_mipmap<bcdec_bc6h_half_u, BCDEC_BC6H_BLOCK_SIZE, 6, 2>(width, height, src_blocks, dec_blocks);
} break;
case BCdec_BC6S: {
DECOMPRESS_LOOP(bcdec_bc6h_half_s, BCDEC_BC6H_BLOCK_SIZE, 6, 3)
_decompress_mipmap<bcdec_bc6h_half_s, BCDEC_BC6H_BLOCK_SIZE, 6, 2>(width, height, src_blocks, dec_blocks);
} break;
case BCdec_BC7: {
DECOMPRESS_LOOP(bcdec_bc7, BCDEC_BC7_BLOCK_SIZE, 4, 4)
_decompress_mipmap<bcdec_bc7, BCDEC_BC7_BLOCK_SIZE, 4, 1>(width, height, src_blocks, dec_blocks);
} break;
}
}
#undef DECOMPRESS_LOOP
#undef DECOMPRESS_LOOP_SAFE
}
void image_decompress_bcdec(Image *p_image) {
@@ -156,21 +220,6 @@ void image_decompress_bcdec(Image *p_image) {
int width = p_image->get_width();
int height = p_image->get_height();
// Compressed images' dimensions should be padded to the upper multiple of 4.
// If they aren't, they need to be realigned (the actual data is correctly padded though).
const bool need_width_realign = width % 4 != 0;
const bool need_height_realign = height % 4 != 0;
if (need_width_realign || need_height_realign) {
int new_width = need_width_realign ? width + (4 - (width % 4)) : width;
int new_height = need_height_realign ? height + (4 - (height % 4)) : height;
print_verbose(vformat("Compressed image's dimensions are not multiples of 4 (%dx%d), aligning to (%dx%d)", width, height, new_width, new_height));
width = new_width;
height = new_height;
}
Image::Format source_format = p_image->get_format();
Image::Format target_format = Image::FORMAT_MAX;
@@ -237,8 +286,8 @@ void image_decompress_bcdec(Image *p_image) {
// Decompress mipmaps.
for (int i = 0; i <= mm_count; i++) {
int mipmap_w = 0, mipmap_h = 0;
int64_t src_ofs = Image::get_image_mipmap_offset_and_dimensions(width, height, source_format, i, mipmap_w, mipmap_h);
int64_t dst_ofs = Image::get_image_mipmap_offset(width, height, target_format, i);
int64_t src_ofs = Image::get_image_mipmap_offset(width, height, source_format, i);
int64_t dst_ofs = Image::get_image_mipmap_offset_and_dimensions(width, height, target_format, i, mipmap_w, mipmap_h);
decompress_image(bcdec_format, rb + src_ofs, wb + dst_ofs, mipmap_w, mipmap_h);
}