305 lines
11 KiB
C++
305 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_ETC2;
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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_R;
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case Image::USED_CHANNELS_RG:
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return EtcpakType::ETCPAK_TYPE_ETC2_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_RGTC_R;
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case Image::USED_CHANNELS_RG:
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return EtcpakType::ETCPAK_TYPE_RGTC_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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_compress_etcpak(_determine_etc_type(p_channels), r_img);
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}
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void _compress_bc(Image *r_img, Image::UsedChannels p_channels) {
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_compress_etcpak(_determine_dxt_type(p_channels), r_img);
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}
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void _compress_etcpak(EtcpakType p_compress_type, Image *r_img) {
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uint64_t start_time = OS::get_singleton()->get_ticks_msec();
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// The image is already compressed, return.
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if (r_img->is_compressed()) {
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return;
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}
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// Convert to RGBA8 for compression.
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r_img->convert(Image::FORMAT_RGBA8);
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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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switch (p_compress_type) {
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case EtcpakType::ETCPAK_TYPE_ETC1:
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target_format = Image::FORMAT_ETC;
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break;
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case EtcpakType::ETCPAK_TYPE_ETC2:
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target_format = Image::FORMAT_ETC2_RGB8;
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break;
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case EtcpakType::ETCPAK_TYPE_ETC2_ALPHA:
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target_format = Image::FORMAT_ETC2_RGBA8;
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break;
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case EtcpakType::ETCPAK_TYPE_ETC2_R:
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target_format = Image::FORMAT_ETC2_R11;
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break;
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case EtcpakType::ETCPAK_TYPE_ETC2_RG:
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target_format = Image::FORMAT_ETC2_RG11;
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break;
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case 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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break;
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case EtcpakType::ETCPAK_TYPE_DXT1:
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target_format = Image::FORMAT_DXT1;
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break;
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case EtcpakType::ETCPAK_TYPE_DXT5:
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target_format = Image::FORMAT_DXT5;
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break;
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case EtcpakType::ETCPAK_TYPE_RGTC_R:
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target_format = Image::FORMAT_RGTC_R;
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break;
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case EtcpakType::ETCPAK_TYPE_RGTC_RG:
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target_format = Image::FORMAT_RGTC_RG;
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break;
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case 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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break;
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default:
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ERR_FAIL_MSG("Invalid or unsupported etcpak compression format, not ETC or DXT.");
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break;
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}
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// It's badly documented but ETCPAK seems to expect BGRA8 for ETC formats.
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if (p_compress_type < EtcpakType::ETCPAK_TYPE_DXT1) {
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r_img->convert_rgba8_to_bgra8();
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}
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// Compress image data and (if required) mipmaps.
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const bool has_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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if (width % 4 != 0 || height % 4 != 0) {
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width = width <= 2 ? width : (width + 3) & ~3;
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height = height <= 2 ? height : (height + 3) & ~3;
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}
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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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// Create the buffer for compressed image data.
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Vector<uint8_t> dest_data;
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dest_data.resize(Image::get_image_data_size(width, height, target_format, has_mipmaps));
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uint8_t *dest_write = dest_data.ptrw();
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const uint8_t *src_read = r_img->get_data().ptr();
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const int mip_count = has_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 dest_mip_w, dest_mip_h;
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int64_t dest_mip_ofs = Image::get_image_mipmap_offset_and_dimensions(width, height, target_format, i, dest_mip_w, dest_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(dest_mip_ofs % 8 != 0);
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uint64_t *dest_mip_write = reinterpret_cast<uint64_t *>(dest_write + dest_mip_ofs);
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// Block size.
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dest_mip_w = (dest_mip_w + 3) & ~3;
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dest_mip_h = (dest_mip_h + 3) & ~3;
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const uint32_t blocks = dest_mip_w * dest_mip_h / 16;
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// Get mip data from source image for reading.
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int64_t src_mip_ofs, src_mip_size;
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int src_mip_w, src_mip_h;
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r_img->get_mipmap_offset_size_and_dimensions(i, src_mip_ofs, src_mip_size, src_mip_w, src_mip_h);
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const uint32_t *src_mip_read = reinterpret_cast<const uint32_t *>(src_read + src_mip_ofs);
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// Pad textures to nearest block by smearing.
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if (dest_mip_w != src_mip_w || dest_mip_h != src_mip_h) {
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// Reserve the buffer for padded image data.
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padded_src.resize(dest_mip_w * dest_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 < src_mip_h; y++) {
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for (x = 0; x < src_mip_w; x++) {
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ptrw[dest_mip_w * y + x] = src_mip_read[src_mip_w * y + x];
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}
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// First, smear in x.
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for (; x < dest_mip_w; x++) {
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ptrw[dest_mip_w * y + x] = ptrw[dest_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 < dest_mip_h; y++) {
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for (x = 0; x < dest_mip_w; x++) {
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ptrw[dest_mip_w * y + x] = ptrw[dest_mip_w * y + x - dest_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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switch (p_compress_type) {
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case EtcpakType::ETCPAK_TYPE_ETC1:
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CompressEtc1RgbDither(src_mip_read, dest_mip_write, blocks, dest_mip_w);
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break;
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case EtcpakType::ETCPAK_TYPE_ETC2:
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CompressEtc2Rgb(src_mip_read, dest_mip_write, blocks, dest_mip_w, true);
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break;
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case EtcpakType::ETCPAK_TYPE_ETC2_ALPHA:
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case EtcpakType::ETCPAK_TYPE_ETC2_RA_AS_RG:
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CompressEtc2Rgba(src_mip_read, dest_mip_write, blocks, dest_mip_w, true);
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break;
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case EtcpakType::ETCPAK_TYPE_ETC2_R:
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CompressEacR(src_mip_read, dest_mip_write, blocks, dest_mip_w);
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break;
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case EtcpakType::ETCPAK_TYPE_ETC2_RG:
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CompressEacRg(src_mip_read, dest_mip_write, blocks, dest_mip_w);
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break;
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case EtcpakType::ETCPAK_TYPE_DXT1:
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CompressDxt1Dither(src_mip_read, dest_mip_write, blocks, dest_mip_w);
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break;
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case EtcpakType::ETCPAK_TYPE_DXT5:
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case EtcpakType::ETCPAK_TYPE_DXT5_RA_AS_RG:
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CompressDxt5(src_mip_read, dest_mip_write, blocks, dest_mip_w);
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break;
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case EtcpakType::ETCPAK_TYPE_RGTC_R:
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CompressBc4(src_mip_read, dest_mip_write, blocks, dest_mip_w);
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break;
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case EtcpakType::ETCPAK_TYPE_RGTC_RG:
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CompressBc5(src_mip_read, dest_mip_write, blocks, dest_mip_w);
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break;
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default:
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ERR_FAIL_MSG("etcpak: Invalid or unsupported compression format.");
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break;
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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, has_mipmaps, target_format, dest_data);
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print_verbose(vformat("etcpak: Encoding took %d ms.", OS::get_singleton()->get_ticks_msec() - start_time));
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}
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