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