Use libsquish to decompress DXT textures.

This commit is contained in:
Ferenc Arn 2017-04-29 20:14:14 -05:00
parent a75623f436
commit 3c175115eb
5 changed files with 47 additions and 328 deletions

View file

@ -1370,7 +1370,7 @@ Error Image::load(const String &p_path) {
return ImageLoader::load_image(p_path, this); return ImageLoader::load_image(p_path, this);
} }
Error Image::save_png(const String &p_path) { Error Image::save_png(const String &p_path) const {
if (save_png_func == NULL) if (save_png_func == NULL)
return ERR_UNAVAILABLE; return ERR_UNAVAILABLE;
@ -1391,337 +1391,14 @@ int Image::get_image_required_mipmaps(int p_width, int p_height, Format p_format
return mm; return mm;
} }
Error Image::_decompress_bc() {
int wd = width, ht = height;
if (wd % 4 != 0) {
wd += 4 - (wd % 4);
}
if (ht % 4 != 0) {
ht += 4 - (ht % 4);
}
int mm;
int size = _get_dst_image_size(wd, ht, FORMAT_RGBA8, mm);
PoolVector<uint8_t> newdata;
newdata.resize(size);
PoolVector<uint8_t>::Write w = newdata.write();
PoolVector<uint8_t>::Read r = data.read();
int rofs = 0;
int wofs = 0;
//print_line("width: "+itos(wd)+" height: "+itos(ht));
for (int i = 0; i <= mm; i++) {
switch (format) {
case FORMAT_DXT1: {
int len = (wd * ht) / 16;
uint8_t *dst = &w[wofs];
uint32_t ofs_table[16];
for (int x = 0; x < 4; x++) {
for (int y = 0; y < 4; y++) {
ofs_table[15 - (y * 4 + (3 - x))] = (x + y * wd) * 4;
}
}
for (int j = 0; j < len; j++) {
const uint8_t *src = &r[rofs + j * 8];
uint16_t col_a = src[1];
col_a <<= 8;
col_a |= src[0];
uint16_t col_b = src[3];
col_b <<= 8;
col_b |= src[2];
uint8_t table[4][4] = {
{ uint8_t((col_a >> 11) << 3), uint8_t(((col_a >> 5) & 0x3f) << 2), uint8_t(((col_a)&0x1f) << 3), 255 },
{ uint8_t((col_b >> 11) << 3), uint8_t(((col_b >> 5) & 0x3f) << 2), uint8_t(((col_b)&0x1f) << 3), 255 },
{ 0, 0, 0, 255 },
{ 0, 0, 0, 255 }
};
if (col_a < col_b) {
//punchrough
table[2][0] = (int(table[0][0]) + int(table[1][0])) >> 1;
table[2][1] = (int(table[0][1]) + int(table[1][1])) >> 1;
table[2][2] = (int(table[0][2]) + int(table[1][2])) >> 1;
table[3][3] = 0; //premul alpha black
} else {
//gradient
table[2][0] = (int(table[0][0]) * 2 + int(table[1][0])) / 3;
table[2][1] = (int(table[0][1]) * 2 + int(table[1][1])) / 3;
table[2][2] = (int(table[0][2]) * 2 + int(table[1][2])) / 3;
table[3][0] = (int(table[0][0]) + int(table[1][0]) * 2) / 3;
table[3][1] = (int(table[0][1]) + int(table[1][1]) * 2) / 3;
table[3][2] = (int(table[0][2]) + int(table[1][2]) * 2) / 3;
}
uint32_t block = src[4];
block <<= 8;
block |= src[5];
block <<= 8;
block |= src[6];
block <<= 8;
block |= src[7];
int y = (j / (wd / 4)) * 4;
int x = (j % (wd / 4)) * 4;
int pixofs = (y * wd + x) * 4;
for (int k = 0; k < 16; k++) {
int idx = pixofs + ofs_table[k];
dst[idx + 0] = table[block & 0x3][0];
dst[idx + 1] = table[block & 0x3][1];
dst[idx + 2] = table[block & 0x3][2];
dst[idx + 3] = table[block & 0x3][3];
block >>= 2;
}
}
rofs += len * 8;
wofs += wd * ht * 4;
wd /= 2;
ht /= 2;
} break;
case FORMAT_DXT3: {
int len = (wd * ht) / 16;
uint8_t *dst = &w[wofs];
uint32_t ofs_table[16];
for (int x = 0; x < 4; x++) {
for (int y = 0; y < 4; y++) {
ofs_table[15 - (y * 4 + (3 - x))] = (x + y * wd) * 4;
}
}
for (int j = 0; j < len; j++) {
const uint8_t *src = &r[rofs + j * 16];
uint64_t ablock = src[1];
ablock <<= 8;
ablock |= src[0];
ablock <<= 8;
ablock |= src[3];
ablock <<= 8;
ablock |= src[2];
ablock <<= 8;
ablock |= src[5];
ablock <<= 8;
ablock |= src[4];
ablock <<= 8;
ablock |= src[7];
ablock <<= 8;
ablock |= src[6];
uint16_t col_a = src[8 + 1];
col_a <<= 8;
col_a |= src[8 + 0];
uint16_t col_b = src[8 + 3];
col_b <<= 8;
col_b |= src[8 + 2];
uint8_t table[4][4] = {
{ uint8_t((col_a >> 11) << 3), uint8_t(((col_a >> 5) & 0x3f) << 2), uint8_t(((col_a)&0x1f) << 3), 255 },
{ uint8_t((col_b >> 11) << 3), uint8_t(((col_b >> 5) & 0x3f) << 2), uint8_t(((col_b)&0x1f) << 3), 255 },
{ 0, 0, 0, 255 },
{ 0, 0, 0, 255 }
};
//always gradient
table[2][0] = (int(table[0][0]) * 2 + int(table[1][0])) / 3;
table[2][1] = (int(table[0][1]) * 2 + int(table[1][1])) / 3;
table[2][2] = (int(table[0][2]) * 2 + int(table[1][2])) / 3;
table[3][0] = (int(table[0][0]) + int(table[1][0]) * 2) / 3;
table[3][1] = (int(table[0][1]) + int(table[1][1]) * 2) / 3;
table[3][2] = (int(table[0][2]) + int(table[1][2]) * 2) / 3;
uint32_t block = src[4 + 8];
block <<= 8;
block |= src[5 + 8];
block <<= 8;
block |= src[6 + 8];
block <<= 8;
block |= src[7 + 8];
int y = (j / (wd / 4)) * 4;
int x = (j % (wd / 4)) * 4;
int pixofs = (y * wd + x) * 4;
for (int k = 0; k < 16; k++) {
uint8_t alpha = ablock & 0xf;
alpha = int(alpha) * 255 / 15; //right way for alpha
int idx = pixofs + ofs_table[k];
dst[idx + 0] = table[block & 0x3][0];
dst[idx + 1] = table[block & 0x3][1];
dst[idx + 2] = table[block & 0x3][2];
dst[idx + 3] = alpha;
block >>= 2;
ablock >>= 4;
}
}
rofs += len * 16;
wofs += wd * ht * 4;
wd /= 2;
ht /= 2;
} break;
case FORMAT_DXT5: {
int len = (wd * ht) / 16;
uint8_t *dst = &w[wofs];
uint32_t ofs_table[16];
for (int x = 0; x < 4; x++) {
for (int y = 0; y < 4; y++) {
ofs_table[15 - (y * 4 + (3 - x))] = (x + y * wd) * 4;
}
}
for (int j = 0; j < len; j++) {
const uint8_t *src = &r[rofs + j * 16];
uint8_t a_start = src[1];
uint8_t a_end = src[0];
uint64_t ablock = src[3];
ablock <<= 8;
ablock |= src[2];
ablock <<= 8;
ablock |= src[5];
ablock <<= 8;
ablock |= src[4];
ablock <<= 8;
ablock |= src[7];
ablock <<= 8;
ablock |= src[6];
uint8_t atable[8];
if (a_start > a_end) {
atable[0] = (int(a_start) * 7 + int(a_end) * 0) / 7;
atable[1] = (int(a_start) * 6 + int(a_end) * 1) / 7;
atable[2] = (int(a_start) * 5 + int(a_end) * 2) / 7;
atable[3] = (int(a_start) * 4 + int(a_end) * 3) / 7;
atable[4] = (int(a_start) * 3 + int(a_end) * 4) / 7;
atable[5] = (int(a_start) * 2 + int(a_end) * 5) / 7;
atable[6] = (int(a_start) * 1 + int(a_end) * 6) / 7;
atable[7] = (int(a_start) * 0 + int(a_end) * 7) / 7;
} else {
atable[0] = (int(a_start) * 5 + int(a_end) * 0) / 5;
atable[1] = (int(a_start) * 4 + int(a_end) * 1) / 5;
atable[2] = (int(a_start) * 3 + int(a_end) * 2) / 5;
atable[3] = (int(a_start) * 2 + int(a_end) * 3) / 5;
atable[4] = (int(a_start) * 1 + int(a_end) * 4) / 5;
atable[5] = (int(a_start) * 0 + int(a_end) * 5) / 5;
atable[6] = 0;
atable[7] = 255;
}
uint16_t col_a = src[8 + 1];
col_a <<= 8;
col_a |= src[8 + 0];
uint16_t col_b = src[8 + 3];
col_b <<= 8;
col_b |= src[8 + 2];
uint8_t table[4][4] = {
{ uint8_t((col_a >> 11) << 3), uint8_t(((col_a >> 5) & 0x3f) << 2), uint8_t(((col_a)&0x1f) << 3), 255 },
{ uint8_t((col_b >> 11) << 3), uint8_t(((col_b >> 5) & 0x3f) << 2), uint8_t(((col_b)&0x1f) << 3), 255 },
{ 0, 0, 0, 255 },
{ 0, 0, 0, 255 }
};
//always gradient
table[2][0] = (int(table[0][0]) * 2 + int(table[1][0])) / 3;
table[2][1] = (int(table[0][1]) * 2 + int(table[1][1])) / 3;
table[2][2] = (int(table[0][2]) * 2 + int(table[1][2])) / 3;
table[3][0] = (int(table[0][0]) + int(table[1][0]) * 2) / 3;
table[3][1] = (int(table[0][1]) + int(table[1][1]) * 2) / 3;
table[3][2] = (int(table[0][2]) + int(table[1][2]) * 2) / 3;
uint32_t block = src[4 + 8];
block <<= 8;
block |= src[5 + 8];
block <<= 8;
block |= src[6 + 8];
block <<= 8;
block |= src[7 + 8];
int y = (j / (wd / 4)) * 4;
int x = (j % (wd / 4)) * 4;
int pixofs = (y * wd + x) * 4;
for (int k = 0; k < 16; k++) {
uint8_t alpha = ablock & 0x7;
int idx = pixofs + ofs_table[k];
dst[idx + 0] = table[block & 0x3][0];
dst[idx + 1] = table[block & 0x3][1];
dst[idx + 2] = table[block & 0x3][2];
dst[idx + 3] = atable[alpha];
block >>= 2;
ablock >>= 3;
}
}
rofs += len * 16;
wofs += wd * ht * 4;
wd /= 2;
ht /= 2;
} break;
default: {}
}
}
w = PoolVector<uint8_t>::Write();
r = PoolVector<uint8_t>::Read();
data = newdata;
format = FORMAT_RGBA8;
if (wd != width || ht != height) {
SWAP(width, wd);
SWAP(height, ht);
crop(wd, ht);
}
return OK;
}
bool Image::is_compressed() const { bool Image::is_compressed() const {
return format >= FORMAT_RGB565; return format >= FORMAT_RGB565;
} }
Error Image::decompress() { Error Image::decompress() {
if (format >= FORMAT_DXT1 && format <= FORMAT_ATI2) if (format >= FORMAT_DXT1 && format <= FORMAT_ATI2 && _image_decompress_bc)
_decompress_bc(); //_image_decompress_bc(this); _image_decompress_bc(this);
else if (format >= FORMAT_PVRTC2 && format <= FORMAT_PVRTC4A && _image_decompress_pvrtc) else if (format >= FORMAT_PVRTC2 && format <= FORMAT_PVRTC4A && _image_decompress_pvrtc)
_image_decompress_pvrtc(this); _image_decompress_pvrtc(this);
else if (format == FORMAT_ETC && _image_decompress_etc) else if (format == FORMAT_ETC && _image_decompress_etc)

View file

@ -227,7 +227,7 @@ public:
PoolVector<uint8_t> get_data() const; PoolVector<uint8_t> get_data() const;
Error load(const String &p_path); Error load(const String &p_path);
Error save_png(const String &p_path); Error save_png(const String &p_path) const;
/** /**
* create an empty image * create an empty image

View file

@ -39,6 +39,46 @@
#include <squish.h> #include <squish.h>
void image_decompress_squish(Image *p_image) {
int w = p_image->get_width();
int h = p_image->get_height();
Image::Format target_format = Image::FORMAT_RGBA8;
PoolVector<uint8_t> data;
int target_size = Image::get_image_data_size(w, h, target_format, p_image->has_mipmaps() ? -1 : 0);
int mm_count = p_image->get_mipmap_count();
data.resize(target_size);
PoolVector<uint8_t>::Read rb = p_image->get_data().read();
PoolVector<uint8_t>::Write wb = data.write();
int squish_flags = Image::FORMAT_MAX;
if (p_image->get_format() == Image::FORMAT_DXT1) {
squish_flags = squish::kDxt1;
} else if (p_image->get_format() == Image::FORMAT_DXT3) {
squish_flags = squish::kDxt3;
} else if (p_image->get_format() == Image::FORMAT_DXT5) {
squish_flags = squish::kDxt5;
} else if (p_image->get_format() == Image::FORMAT_ATI1) {
squish_flags = squish::kBc4;
} else if (p_image->get_format() == Image::FORMAT_ATI2) {
squish_flags = squish::kBc5;
} else {
ERR_FAIL_COND(true);
return;
}
int dst_ofs = 0;
for (int i = 0; i <= mm_count; i++) {
int src_ofs = 0, mipmap_size = 0, mipmap_w = 0, mipmap_h = 0;
p_image->get_mipmap_offset_size_and_dimensions(i, src_ofs, mipmap_size, mipmap_w, mipmap_h);
squish::DecompressImage(&wb[dst_ofs], mipmap_w, mipmap_h, &rb[src_ofs], squish_flags);
}
p_image->create(p_image->get_width(), p_image->get_height(), p_image->has_mipmaps(), target_format, data);
}
void image_compress_squish(Image *p_image) { void image_compress_squish(Image *p_image) {
int w = p_image->get_width(); int w = p_image->get_width();
@ -56,7 +96,7 @@ void image_compress_squish(Image *p_image) {
return; //do not compress, already compressed return; //do not compress, already compressed
int shift = 0; int shift = 0;
int squish_comp = squish::kColourRangeFit; int squish_comp = squish::kColourRangeFit; // TODO: use lossy quality setting to determine the quality
Image::Format target_format; Image::Format target_format;
if (p_image->get_format() == Image::FORMAT_LA8) { if (p_image->get_format() == Image::FORMAT_LA8) {

View file

@ -33,5 +33,6 @@
#include "image.h" #include "image.h"
void image_compress_squish(Image *p_image); void image_compress_squish(Image *p_image);
void image_decompress_squish(Image *p_image);
#endif // IMAGE_COMPRESS_SQUISH_H #endif // IMAGE_COMPRESS_SQUISH_H

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@ -36,6 +36,7 @@
void register_squish_types() { void register_squish_types() {
Image::set_compress_bc_func(image_compress_squish); Image::set_compress_bc_func(image_compress_squish);
Image::_image_decompress_bc = image_decompress_squish;
} }
void unregister_squish_types() {} void unregister_squish_types() {}