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diff --git a/modules/astcenc/image_compress_astcenc.cpp b/modules/astcenc/image_compress_astcenc.cpp
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+/**************************************************************************/
+/* image_compress_astcenc.cpp */
+/**************************************************************************/
+/* This file is part of: */
+/* GODOT ENGINE */
+/* https://godotengine.org */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
+/* */
+/* 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_compress_astcenc.h"
+
+#include "core/os/os.h"
+#include "core/string/print_string.h"
+
+#include <astcenc.h>
+
+void _compress_astc(Image *r_img, float p_lossy_quality, Image::ASTCFormat p_format) {
+ uint64_t start_time = OS::get_singleton()->get_ticks_msec();
+
+ // TODO: See how to handle lossy quality.
+
+ Image::Format img_format = r_img->get_format();
+ if (img_format >= Image::FORMAT_DXT1) {
+ return; // Do not compress, already compressed.
+ }
+
+ bool is_hdr = false;
+ if ((img_format >= Image::FORMAT_RH) && (img_format <= Image::FORMAT_RGBE9995)) {
+ is_hdr = true;
+ r_img->convert(Image::FORMAT_RGBAF);
+ } else {
+ r_img->convert(Image::FORMAT_RGBA8);
+ }
+
+ // Determine encoder output format from our enum.
+
+ Image::Format target_format = Image::FORMAT_RGBA8;
+ astcenc_profile profile = ASTCENC_PRF_LDR;
+ unsigned int block_x = 4;
+ unsigned int block_y = 4;
+
+ if (p_format == Image::ASTCFormat::ASTC_FORMAT_4x4) {
+ if (is_hdr) {
+ target_format = Image::FORMAT_ASTC_4x4_HDR;
+ profile = ASTCENC_PRF_HDR;
+ } else {
+ target_format = Image::FORMAT_ASTC_4x4;
+ }
+ } else if (p_format == Image::ASTCFormat::ASTC_FORMAT_8x8) {
+ if (is_hdr) {
+ target_format = Image::FORMAT_ASTC_8x8_HDR;
+ profile = ASTCENC_PRF_HDR;
+ } else {
+ target_format = Image::FORMAT_ASTC_8x8;
+ }
+ block_x = 8;
+ block_y = 8;
+ }
+
+ // Compress image data and (if required) mipmaps.
+
+ const bool mipmaps = r_img->has_mipmaps();
+ int width = r_img->get_width();
+ int height = r_img->get_height();
+
+ print_verbose(vformat("astcenc: Encoding image size %dx%d to format %s%s.", width, height, Image::get_format_name(target_format), mipmaps ? ", with mipmaps" : ""));
+
+ // Initialize astcenc.
+
+ astcenc_config config;
+ config.block_x = block_x;
+ config.block_y = block_y;
+ config.profile = profile;
+ const float quality = ASTCENC_PRE_MEDIUM;
+
+ astcenc_error status = astcenc_config_init(profile, block_x, block_y, block_x, quality, 0, &config);
+ ERR_FAIL_COND_MSG(status != ASTCENC_SUCCESS,
+ vformat("astcenc: Configuration initialization failed: %s.", astcenc_get_error_string(status)));
+
+ // Context allocation.
+
+ astcenc_context *context;
+ const unsigned int thread_count = OS::get_singleton()->get_processor_count();
+
+ status = astcenc_context_alloc(&config, thread_count, &context);
+ ERR_FAIL_COND_MSG(status != ASTCENC_SUCCESS,
+ vformat("astcenc: Context allocation failed: %s.", astcenc_get_error_string(status)));
+
+ // Compress image.
+
+ Vector<uint8_t> image_data = r_img->get_data();
+ uint8_t *slices = image_data.ptrw();
+
+ astcenc_image image;
+ image.dim_x = width;
+ image.dim_y = height;
+ image.dim_z = 1;
+ image.data_type = ASTCENC_TYPE_U8;
+ if (is_hdr) {
+ image.data_type = ASTCENC_TYPE_F32;
+ }
+ image.data = reinterpret_cast<void **>(&slices);
+
+ // Compute the number of ASTC blocks in each dimension.
+ unsigned int block_count_x = (width + block_x - 1) / block_x;
+ unsigned int block_count_y = (height + block_y - 1) / block_y;
+ size_t comp_len = block_count_x * block_count_y * 16;
+
+ Vector<uint8_t> compressed_data;
+ compressed_data.resize(comp_len);
+ compressed_data.fill(0);
+
+ const astcenc_swizzle swizzle = {
+ ASTCENC_SWZ_R, ASTCENC_SWZ_G, ASTCENC_SWZ_B, ASTCENC_SWZ_A
+ };
+
+ status = astcenc_compress_image(context, &image, &swizzle, compressed_data.ptrw(), comp_len, 0);
+ ERR_FAIL_COND_MSG(status != ASTCENC_SUCCESS,
+ vformat("astcenc: ASTC image compression failed: %s.", astcenc_get_error_string(status)));
+
+ // Replace original image with compressed one.
+
+ r_img->set_data(width, height, mipmaps, target_format, compressed_data);
+
+ print_verbose(vformat("astcenc: Encoding took %s ms.", rtos(OS::get_singleton()->get_ticks_msec() - start_time)));
+}
+
+void _decompress_astc(Image *r_img) {
+ uint64_t start_time = OS::get_singleton()->get_ticks_msec();
+
+ // Determine decompression parameters from image format.
+
+ Image::Format img_format = r_img->get_format();
+ bool is_hdr = false;
+ unsigned int block_x = 0;
+ unsigned int block_y = 0;
+ if (img_format == Image::FORMAT_ASTC_4x4) {
+ block_x = 4;
+ block_y = 4;
+ is_hdr = false;
+ } else if (img_format == Image::FORMAT_ASTC_4x4_HDR) {
+ block_x = 4;
+ block_y = 4;
+ is_hdr = true;
+ } else if (img_format == Image::FORMAT_ASTC_8x8) {
+ block_x = 8;
+ block_y = 8;
+ is_hdr = false;
+ } else if (img_format == Image::FORMAT_ASTC_8x8_HDR) {
+ block_x = 8;
+ block_y = 8;
+ is_hdr = true;
+ } else {
+ ERR_FAIL_MSG("astcenc: Cannot decompress Image with a non-ASTC format.");
+ }
+
+ // Initialize astcenc.
+
+ astcenc_profile profile = ASTCENC_PRF_LDR;
+ if (is_hdr) {
+ profile = ASTCENC_PRF_HDR;
+ }
+ astcenc_config config;
+ const float quality = ASTCENC_PRE_MEDIUM;
+
+ astcenc_error status = astcenc_config_init(profile, block_x, block_y, block_x, quality, 0, &config);
+ ERR_FAIL_COND_MSG(status != ASTCENC_SUCCESS,
+ vformat("astcenc: Configuration initialization failed: %s.", astcenc_get_error_string(status)));
+
+ // Context allocation.
+
+ astcenc_context *context = nullptr;
+ const unsigned int thread_count = OS::get_singleton()->get_processor_count();
+
+ status = astcenc_context_alloc(&config, thread_count, &context);
+ ERR_FAIL_COND_MSG(status != ASTCENC_SUCCESS,
+ vformat("astcenc: Context allocation failed: %s.", astcenc_get_error_string(status)));
+
+ // Decompress image.
+
+ const bool mipmaps = r_img->has_mipmaps();
+ int width = r_img->get_width();
+ int height = r_img->get_height();
+
+ astcenc_image image;
+ image.dim_x = width;
+ image.dim_y = height;
+ image.dim_z = 1;
+ image.data_type = ASTCENC_TYPE_U8;
+ Image::Format target_format = Image::FORMAT_RGBA8;
+ if (is_hdr) {
+ target_format = Image::FORMAT_RGBAF;
+ image.data_type = ASTCENC_TYPE_F32;
+ }
+
+ Vector<uint8_t> image_data = r_img->get_data();
+
+ Vector<uint8_t> new_image_data;
+ new_image_data.resize(Image::get_image_data_size(width, height, target_format, false));
+ new_image_data.fill(0);
+ uint8_t *slices = new_image_data.ptrw();
+ image.data = reinterpret_cast<void **>(&slices);
+
+ const astcenc_swizzle swizzle = {
+ ASTCENC_SWZ_R, ASTCENC_SWZ_G, ASTCENC_SWZ_B, ASTCENC_SWZ_A
+ };
+
+ status = astcenc_decompress_image(context, image_data.ptr(), image_data.size(), &image, &swizzle, 0);
+ ERR_FAIL_COND_MSG(status != ASTCENC_SUCCESS,
+ vformat("astcenc: ASTC decompression failed: %s.", astcenc_get_error_string(status)));
+ ERR_FAIL_COND_MSG(image.dim_z > 1,
+ "astcenc: ASTC decompression failed because this is a 3D texture, which is not supported.");
+
+ // Replace original image with compressed one.
+
+ Image::Format image_format = Image::FORMAT_RGBA8;
+ if (image.data_type == ASTCENC_TYPE_F32) {
+ image_format = Image::FORMAT_RGBAF;
+ } else if (image.data_type == ASTCENC_TYPE_U8) {
+ image_format = Image::FORMAT_RGBA8;
+ } else if (image.data_type == ASTCENC_TYPE_F16) {
+ image_format = Image::FORMAT_RGBAH;
+ } else {
+ ERR_FAIL_MSG("astcenc: ASTC decompression failed with an unknown format.");
+ }
+
+ r_img->set_data(image.dim_x, image.dim_y, mipmaps, image_format, new_image_data);
+
+ print_verbose(vformat("astcenc: Decompression took %s ms.", rtos(OS::get_singleton()->get_ticks_msec() - start_time)));
+}
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