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242 lines
11 KiB
C++
242 lines
11 KiB
C++
/**************************************************************************/
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/* image_compress_etcpak.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) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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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_compress_etcpak.h"
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#include "core/os/os.h"
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#include "core/string/print_string.h"
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#include <ProcessDxtc.hpp>
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#include <ProcessRGB.hpp>
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EtcpakType _determine_etc_type(Image::UsedChannels p_channels) {
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switch (p_channels) {
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case Image::USED_CHANNELS_L:
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return EtcpakType::ETCPAK_TYPE_ETC1;
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case Image::USED_CHANNELS_LA:
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return EtcpakType::ETCPAK_TYPE_ETC2_ALPHA;
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case Image::USED_CHANNELS_R:
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return EtcpakType::ETCPAK_TYPE_ETC2;
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case Image::USED_CHANNELS_RG:
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return EtcpakType::ETCPAK_TYPE_ETC2_RA_AS_RG;
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case Image::USED_CHANNELS_RGB:
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return EtcpakType::ETCPAK_TYPE_ETC2;
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case Image::USED_CHANNELS_RGBA:
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return EtcpakType::ETCPAK_TYPE_ETC2_ALPHA;
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default:
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return EtcpakType::ETCPAK_TYPE_ETC2_ALPHA;
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}
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}
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EtcpakType _determine_dxt_type(Image::UsedChannels p_channels) {
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switch (p_channels) {
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case Image::USED_CHANNELS_L:
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return EtcpakType::ETCPAK_TYPE_DXT1;
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case Image::USED_CHANNELS_LA:
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return EtcpakType::ETCPAK_TYPE_DXT5;
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case Image::USED_CHANNELS_R:
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return EtcpakType::ETCPAK_TYPE_DXT5;
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case Image::USED_CHANNELS_RG:
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return EtcpakType::ETCPAK_TYPE_DXT5_RA_AS_RG;
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case Image::USED_CHANNELS_RGB:
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return EtcpakType::ETCPAK_TYPE_DXT1;
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case Image::USED_CHANNELS_RGBA:
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return EtcpakType::ETCPAK_TYPE_DXT5;
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default:
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return EtcpakType::ETCPAK_TYPE_DXT5;
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}
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}
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void _compress_etc1(Image *r_img) {
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_compress_etcpak(EtcpakType::ETCPAK_TYPE_ETC1, r_img);
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}
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void _compress_etc2(Image *r_img, Image::UsedChannels p_channels) {
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EtcpakType type = _determine_etc_type(p_channels);
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_compress_etcpak(type, r_img);
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}
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void _compress_bc(Image *r_img, Image::UsedChannels p_channels) {
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EtcpakType type = _determine_dxt_type(p_channels);
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_compress_etcpak(type, r_img);
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}
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void _compress_etcpak(EtcpakType p_compresstype, Image *r_img) {
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uint64_t start_time = OS::get_singleton()->get_ticks_msec();
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Image::Format img_format = r_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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// Use RGBA8 to convert.
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if (img_format != Image::FORMAT_RGBA8) {
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r_img->convert(Image::FORMAT_RGBA8);
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}
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// Determine output format based on Etcpak type.
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Image::Format target_format = Image::FORMAT_RGBA8;
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if (p_compresstype == EtcpakType::ETCPAK_TYPE_ETC1) {
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target_format = Image::FORMAT_ETC;
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r_img->convert_rgba8_to_bgra8(); // It's badly documented but ETCPAK seems to be expected BGRA8 for ETC.
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} else if (p_compresstype == EtcpakType::ETCPAK_TYPE_ETC2) {
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target_format = Image::FORMAT_ETC2_RGB8;
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r_img->convert_rgba8_to_bgra8(); // It's badly documented but ETCPAK seems to be expected BGRA8 for ETC.
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} else if (p_compresstype == EtcpakType::ETCPAK_TYPE_ETC2_RA_AS_RG) {
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target_format = Image::FORMAT_ETC2_RA_AS_RG;
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r_img->convert_rg_to_ra_rgba8();
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r_img->convert_rgba8_to_bgra8(); // It's badly documented but ETCPAK seems to be expected BGRA8 for ETC.
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} else if (p_compresstype == EtcpakType::ETCPAK_TYPE_ETC2_ALPHA) {
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target_format = Image::FORMAT_ETC2_RGBA8;
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r_img->convert_rgba8_to_bgra8(); // It's badly documented but ETCPAK seems to be expected BGRA8 for ETC.
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} else if (p_compresstype == EtcpakType::ETCPAK_TYPE_DXT1) {
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target_format = Image::FORMAT_DXT1;
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} else if (p_compresstype == EtcpakType::ETCPAK_TYPE_DXT5_RA_AS_RG) {
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target_format = Image::FORMAT_DXT5_RA_AS_RG;
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r_img->convert_rg_to_ra_rgba8();
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} else if (p_compresstype == EtcpakType::ETCPAK_TYPE_DXT5) {
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target_format = Image::FORMAT_DXT5;
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} else {
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ERR_FAIL_MSG("Invalid or unsupported etcpak compression format, not ETC or DXT.");
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}
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// Compress image data and (if required) mipmaps.
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const bool mipmaps = r_img->has_mipmaps();
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int width = r_img->get_width();
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int height = r_img->get_height();
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/*
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The first mipmap level of a compressed texture must be a multiple of 4. Quote from D3D11.3 spec:
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BC format surfaces are always multiples of full blocks, each block representing 4x4 pixels.
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For mipmaps, the top level map is required to be a multiple of 4 size in all dimensions.
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The sizes for the lower level maps are computed as they are for all mipmapped surfaces,
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and thus may not be a multiple of 4, for example a top level map of 20 results in a second level
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map size of 10. For these cases, there is a differing 'physical' size and a 'virtual' size.
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The virtual size is that computed for each mip level without adjustment, which is 10 for the example.
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The physical size is the virtual size rounded up to the next multiple of 4, which is 12 for the example,
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and this represents the actual memory size. The sampling hardware will apply texture address
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processing based on the virtual size (using, for example, border color if specified for accesses
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beyond 10), and thus for the example case will not access the 11th and 12th row of the resource.
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So for mipmap chains when an axis becomes < 4 in size, only texels 'a','b','e','f'
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are used for a 2x2 map, and texel 'a' is used for 1x1. Note that this is similar to, but distinct from,
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the surface pitch, which can encompass additional padding beyond the physical surface size.
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*/
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int next_width = width <= 2 ? width : (width + 3) & ~3;
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int next_height = height <= 2 ? height : (height + 3) & ~3;
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if (next_width != width || next_height != height) {
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r_img->resize(next_width, next_height, Image::INTERPOLATE_LANCZOS);
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width = r_img->get_width();
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height = r_img->get_height();
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}
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// ERR_FAIL_COND(width % 4 != 0 || height % 4 != 0); // FIXME: No longer guaranteed.
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// Multiple-of-4 should be guaranteed by above.
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// However, power-of-two 3d textures will create Nx2 and Nx1 mipmap levels,
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// which are individually compressed Image objects that violate the above rule.
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// Hence, we allow Nx1 and Nx2 images through without forcing to multiple-of-4.
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const uint8_t *src_read = r_img->get_data().ptr();
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print_verbose(vformat("etcpak: Encoding image size %dx%d to format %s%s.", width, height, Image::get_format_name(target_format), mipmaps ? ", with mipmaps" : ""));
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int dest_size = Image::get_image_data_size(width, height, target_format, mipmaps);
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Vector<uint8_t> dest_data;
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dest_data.resize(dest_size);
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uint8_t *dest_write = dest_data.ptrw();
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int mip_count = mipmaps ? Image::get_image_required_mipmaps(width, height, target_format) : 0;
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Vector<uint32_t> padded_src;
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for (int i = 0; i < mip_count + 1; i++) {
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// Get write mip metrics for target image.
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int orig_mip_w, orig_mip_h;
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int mip_ofs = Image::get_image_mipmap_offset_and_dimensions(width, height, target_format, i, orig_mip_w, orig_mip_h);
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// Ensure that mip offset is a multiple of 8 (etcpak expects uint64_t pointer).
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ERR_FAIL_COND(mip_ofs % 8 != 0);
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uint64_t *dest_mip_write = (uint64_t *)&dest_write[mip_ofs];
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// Block size. Align stride to multiple of 4 (RGBA8).
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int mip_w = (orig_mip_w + 3) & ~3;
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int mip_h = (orig_mip_h + 3) & ~3;
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const uint32_t blocks = mip_w * mip_h / 16;
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// Get mip data from source image for reading.
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int src_mip_ofs = r_img->get_mipmap_offset(i);
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const uint32_t *src_mip_read = (const uint32_t *)&src_read[src_mip_ofs];
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// Pad textures to nearest block by smearing.
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if (mip_w != orig_mip_w || mip_h != orig_mip_h) {
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padded_src.resize(mip_w * mip_h);
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uint32_t *ptrw = padded_src.ptrw();
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int x = 0, y = 0;
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for (y = 0; y < orig_mip_h; y++) {
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for (x = 0; x < orig_mip_w; x++) {
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ptrw[mip_w * y + x] = src_mip_read[orig_mip_w * y + x];
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}
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// First, smear in x.
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for (; x < mip_w; x++) {
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ptrw[mip_w * y + x] = ptrw[mip_w * y + x - 1];
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}
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}
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// Then, smear in y.
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for (; y < mip_h; y++) {
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for (x = 0; x < mip_w; x++) {
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ptrw[mip_w * y + x] = ptrw[mip_w * y + x - mip_w];
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}
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}
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// Override the src_mip_read pointer to our temporary Vector.
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src_mip_read = padded_src.ptr();
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}
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if (p_compresstype == EtcpakType::ETCPAK_TYPE_ETC1) {
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CompressEtc1RgbDither(src_mip_read, dest_mip_write, blocks, mip_w);
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} else if (p_compresstype == EtcpakType::ETCPAK_TYPE_ETC2) {
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CompressEtc2Rgb(src_mip_read, dest_mip_write, blocks, mip_w, true);
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} else if (p_compresstype == EtcpakType::ETCPAK_TYPE_ETC2_ALPHA || p_compresstype == EtcpakType::ETCPAK_TYPE_ETC2_RA_AS_RG) {
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CompressEtc2Rgba(src_mip_read, dest_mip_write, blocks, mip_w, true);
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} else if (p_compresstype == EtcpakType::ETCPAK_TYPE_DXT1) {
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CompressDxt1Dither(src_mip_read, dest_mip_write, blocks, mip_w);
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} else if (p_compresstype == EtcpakType::ETCPAK_TYPE_DXT5 || p_compresstype == EtcpakType::ETCPAK_TYPE_DXT5_RA_AS_RG) {
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CompressDxt5(src_mip_read, dest_mip_write, blocks, mip_w);
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} else {
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ERR_FAIL_MSG("etcpak: Invalid or unsupported compression format.");
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}
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}
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// Replace original image with compressed one.
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r_img->set_data(width, height, mipmaps, target_format, dest_data);
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print_verbose(vformat("etcpak: Encoding took %s ms.", rtos(OS::get_singleton()->get_ticks_msec() - start_time)));
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}
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