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/*************************************************************************/
/* image_etc.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "image_etc.h"
#include "Etc.h"
#include "EtcFilter.h"
#include "core/io/image.h"
#include "core/os/copymem.h"
#include "core/os/os.h"
#include "core/string/print_string.h"
static Image::Format _get_etc2_mode(Image::UsedChannels format) {
switch (format) {
case Image::USED_CHANNELS_R:
return Image::FORMAT_ETC2_R11;
case Image::USED_CHANNELS_RG:
return Image::FORMAT_ETC2_RG11;
case Image::USED_CHANNELS_RGB:
return Image::FORMAT_ETC2_RGB8;
case Image::USED_CHANNELS_RGBA:
return Image::FORMAT_ETC2_RGBA8;
// TODO: would be nice if we could use FORMAT_ETC2_RGB8A1 for FORMAT_RGBA5551
default:
// TODO: Kept for compatibility, but should be investigated whether it's correct or if it should error out
return Image::FORMAT_ETC2_RGBA8;
}
}
static Etc::Image::Format _image_format_to_etc2comp_format(Image::Format format) {
switch (format) {
case Image::FORMAT_ETC:
return Etc::Image::Format::ETC1;
case Image::FORMAT_ETC2_R11:
return Etc::Image::Format::R11;
case Image::FORMAT_ETC2_R11S:
return Etc::Image::Format::SIGNED_R11;
case Image::FORMAT_ETC2_RG11:
return Etc::Image::Format::RG11;
case Image::FORMAT_ETC2_RG11S:
return Etc::Image::Format::SIGNED_RG11;
case Image::FORMAT_ETC2_RGB8:
return Etc::Image::Format::RGB8;
case Image::FORMAT_ETC2_RGBA8:
return Etc::Image::Format::RGBA8;
case Image::FORMAT_ETC2_RGB8A1:
return Etc::Image::Format::RGB8A1;
default:
ERR_FAIL_V(Etc::Image::Format::UNKNOWN);
}
}
static void _compress_etc(Image *p_img, float p_lossy_quality, bool force_etc1_format, Image::UsedChannels p_channels) {
Image::Format img_format = p_img->get_format();
if (img_format >= Image::FORMAT_DXT1) {
return; //do not compress, already compressed
}
if (img_format > Image::FORMAT_RGBA8) {
// TODO: we should be able to handle FORMAT_RGBA4444 and FORMAT_RGBA5551 eventually
return;
}
// FIXME: Commented out during Vulkan rebase.
/*
if (force_etc1_format) {
// If VRAM compression is using ETC, but image has alpha, convert to RGBA4444 or LA8
// This saves space while maintaining the alpha channel
if (detected_channels == Image::USED_CHANNELS_RGBA) {
if (p_img->has_mipmaps()) {
// Image doesn't support mipmaps with RGBA4444 textures
p_img->clear_mipmaps();
}
p_img->convert(Image::FORMAT_RGBA4444);
return;
} else if (detected_channels == Image::USE_CHANNELS_LA) {
p_img->convert(Image::FORMAT_LA8);
return;
}
}
*/
uint32_t imgw = p_img->get_width(), imgh = p_img->get_height();
Image::Format etc_format = force_etc1_format ? Image::FORMAT_ETC : _get_etc2_mode(p_channels);
Ref<Image> img = p_img->duplicate();
if (img->get_format() != Image::FORMAT_RGBA8) {
img->convert(Image::FORMAT_RGBA8); //still uses RGBA to convert
}
if (img->has_mipmaps()) {
if (next_power_of_2(imgw) != imgw || next_power_of_2(imgh) != imgh) {
img->resize_to_po2();
imgw = img->get_width();
imgh = img->get_height();
}
} else {
if (imgw % 4 != 0 || imgh % 4 != 0) {
if (imgw % 4) {
imgw += 4 - imgw % 4;
}
if (imgh % 4) {
imgh += 4 - imgh % 4;
}
img->resize(imgw, imgh);
}
}
const uint8_t *r = img->get_data().ptr();
ERR_FAIL_COND(!r);
unsigned int target_size = Image::get_image_data_size(imgw, imgh, etc_format, p_img->has_mipmaps());
int mmc = 1 + (p_img->has_mipmaps() ? Image::get_image_required_mipmaps(imgw, imgh, etc_format) : 0);
Vector<uint8_t> dst_data;
dst_data.resize(target_size);
uint8_t *w = dst_data.ptrw();
// prepare parameters to be passed to etc2comp
int num_cpus = OS::get_singleton()->get_processor_count();
int encoding_time = 0;
float effort = 0.0; //default, reasonable time
if (p_lossy_quality > 0.75) {
effort = 0.4;
} else if (p_lossy_quality > 0.85) {
effort = 0.6;
} else if (p_lossy_quality > 0.95) {
effort = 0.8;
}
Etc::ErrorMetric error_metric = Etc::ErrorMetric::RGBX; // NOTE: we can experiment with other error metrics
Etc::Image::Format etc2comp_etc_format = _image_format_to_etc2comp_format(etc_format);
int wofs = 0;
print_verbose("ETC: Begin encoding, format: " + Image::get_format_name(etc_format));
uint64_t t = OS::get_singleton()->get_ticks_msec();
for (int i = 0; i < mmc; i++) {
// convert source image to internal etc2comp format (which is equivalent to Image::FORMAT_RGBAF)
// NOTE: We can alternatively add a case to Image::convert to handle Image::FORMAT_RGBAF conversion.
int mipmap_ofs = 0, mipmap_size = 0, mipmap_w = 0, mipmap_h = 0;
img->get_mipmap_offset_size_and_dimensions(i, mipmap_ofs, mipmap_size, mipmap_w, mipmap_h);
const uint8_t *src = &r[mipmap_ofs];
Etc::ColorFloatRGBA *src_rgba_f = new Etc::ColorFloatRGBA[mipmap_w * mipmap_h];
for (int j = 0; j < mipmap_w * mipmap_h; j++) {
int si = j * 4; // RGBA8
src_rgba_f[j] = Etc::ColorFloatRGBA::ConvertFromRGBA8(src[si], src[si + 1], src[si + 2], src[si + 3]);
}
unsigned char *etc_data = nullptr;
unsigned int etc_data_len = 0;
unsigned int extended_width = 0, extended_height = 0;
Etc::Encode((float *)src_rgba_f, mipmap_w, mipmap_h, etc2comp_etc_format, error_metric, effort, num_cpus, num_cpus, &etc_data, &etc_data_len, &extended_width, &extended_height, &encoding_time);
CRASH_COND(wofs + etc_data_len > target_size);
memcpy(&w[wofs], etc_data, etc_data_len);
wofs += etc_data_len;
delete[] etc_data;
delete[] src_rgba_f;
}
print_verbose("ETC: Time encoding: " + rtos(OS::get_singleton()->get_ticks_msec() - t));
p_img->create(imgw, imgh, p_img->has_mipmaps(), etc_format, dst_data);
}
static void _compress_etc1(Image *p_img, float p_lossy_quality) {
_compress_etc(p_img, p_lossy_quality, true, Image::USED_CHANNELS_RGB);
}
static void _compress_etc2(Image *p_img, float p_lossy_quality, Image::UsedChannels p_channels) {
_compress_etc(p_img, p_lossy_quality, false, p_channels);
}
void _register_etc_compress_func() {
Image::_image_compress_etc1_func = _compress_etc1;
Image::_image_compress_etc2_func = _compress_etc2;
}
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