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d95794ec8a
As many open source projects have started doing it, we're removing the current year from the copyright notice, so that we don't need to bump it every year. It seems like only the first year of publication is technically relevant for copyright notices, and even that seems to be something that many companies stopped listing altogether (in a version controlled codebase, the commits are a much better source of date of publication than a hardcoded copyright statement). We also now list Godot Engine contributors first as we're collectively the current maintainers of the project, and we clarify that the "exclusive" copyright of the co-founders covers the timespan before opensourcing (their further contributions are included as part of Godot Engine contributors). Also fixed "cf." Frenchism - it's meant as "refer to / see".
344 lines
12 KiB
C++
344 lines
12 KiB
C++
/**************************************************************************/
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/* image_compress_cvtt.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_cvtt.h"
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#include "core/os/os.h"
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#include "core/os/thread.h"
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#include "core/string/print_string.h"
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#include "core/templates/safe_refcount.h"
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#include <ConvectionKernels.h>
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struct CVTTCompressionJobParams {
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bool is_hdr = false;
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bool is_signed = false;
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int bytes_per_pixel = 0;
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cvtt::BC7EncodingPlan bc7_plan;
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cvtt::Options options;
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};
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struct CVTTCompressionRowTask {
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const uint8_t *in_mm_bytes = nullptr;
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uint8_t *out_mm_bytes = nullptr;
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int y_start = 0;
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int width = 0;
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int height = 0;
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};
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struct CVTTCompressionJobQueue {
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CVTTCompressionJobParams job_params;
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const CVTTCompressionRowTask *job_tasks = nullptr;
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uint32_t num_tasks = 0;
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SafeNumeric<uint32_t> current_task;
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};
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static void _digest_row_task(const CVTTCompressionJobParams &p_job_params, const CVTTCompressionRowTask &p_row_task) {
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const uint8_t *in_bytes = p_row_task.in_mm_bytes;
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uint8_t *out_bytes = p_row_task.out_mm_bytes;
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int w = p_row_task.width;
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int h = p_row_task.height;
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int y_start = p_row_task.y_start;
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int y_end = y_start + 4;
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int bytes_per_pixel = p_job_params.bytes_per_pixel;
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bool is_hdr = p_job_params.is_hdr;
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bool is_signed = p_job_params.is_signed;
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cvtt::PixelBlockU8 input_blocks_ldr[cvtt::NumParallelBlocks];
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cvtt::PixelBlockF16 input_blocks_hdr[cvtt::NumParallelBlocks];
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for (int x_start = 0; x_start < w; x_start += 4 * cvtt::NumParallelBlocks) {
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int x_end = x_start + 4 * cvtt::NumParallelBlocks;
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for (int y = y_start; y < y_end; y++) {
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int first_input_element = (y - y_start) * 4;
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const uint8_t *row_start;
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if (y >= h) {
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row_start = in_bytes + (h - 1) * (w * bytes_per_pixel);
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} else {
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row_start = in_bytes + y * (w * bytes_per_pixel);
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}
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for (int x = x_start; x < x_end; x++) {
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const uint8_t *pixel_start;
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if (x >= w) {
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pixel_start = row_start + (w - 1) * bytes_per_pixel;
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} else {
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pixel_start = row_start + x * bytes_per_pixel;
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}
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int block_index = (x - x_start) / 4;
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int block_element = (x - x_start) % 4 + first_input_element;
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if (is_hdr) {
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memcpy(input_blocks_hdr[block_index].m_pixels[block_element], pixel_start, bytes_per_pixel);
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input_blocks_hdr[block_index].m_pixels[block_element][3] = 0x3c00; // 1.0 (unused)
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} else {
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memcpy(input_blocks_ldr[block_index].m_pixels[block_element], pixel_start, bytes_per_pixel);
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}
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}
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}
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uint8_t output_blocks[16 * cvtt::NumParallelBlocks];
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if (is_hdr) {
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if (is_signed) {
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cvtt::Kernels::EncodeBC6HS(output_blocks, input_blocks_hdr, p_job_params.options);
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} else {
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cvtt::Kernels::EncodeBC6HU(output_blocks, input_blocks_hdr, p_job_params.options);
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}
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} else {
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cvtt::Kernels::EncodeBC7(output_blocks, input_blocks_ldr, p_job_params.options, p_job_params.bc7_plan);
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}
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unsigned int num_real_blocks = ((w - x_start) + 3) / 4;
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if (num_real_blocks > cvtt::NumParallelBlocks) {
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num_real_blocks = cvtt::NumParallelBlocks;
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}
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memcpy(out_bytes, output_blocks, 16 * num_real_blocks);
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out_bytes += 16 * num_real_blocks;
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}
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}
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void image_compress_cvtt(Image *p_image, float p_lossy_quality, Image::UsedChannels p_channels) {
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if (p_image->get_format() >= Image::FORMAT_BPTC_RGBA) {
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return; //do not compress, already compressed
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}
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int w = p_image->get_width();
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int h = p_image->get_height();
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bool is_ldr = (p_image->get_format() <= Image::FORMAT_RGBA8);
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bool is_hdr = (p_image->get_format() >= Image::FORMAT_RH) && (p_image->get_format() <= Image::FORMAT_RGBE9995);
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if (!is_ldr && !is_hdr) {
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return; // Not a usable source format
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}
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cvtt::Options options;
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uint32_t flags = cvtt::Flags::Default;
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flags |= cvtt::Flags::BC7_RespectPunchThrough;
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if (p_channels == Image::USED_CHANNELS_RG) { //guessing this is a normal map
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flags |= cvtt::Flags::Uniform;
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}
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options.flags = flags;
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Image::Format target_format = Image::FORMAT_BPTC_RGBA;
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bool is_signed = false;
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if (is_hdr) {
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if (p_image->get_format() != Image::FORMAT_RGBH) {
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p_image->convert(Image::FORMAT_RGBH);
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}
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const uint8_t *rb = p_image->get_data().ptr();
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const uint16_t *source_data = reinterpret_cast<const uint16_t *>(&rb[0]);
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int pixel_element_count = w * h * 3;
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for (int i = 0; i < pixel_element_count; i++) {
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if ((source_data[i] & 0x8000) != 0 && (source_data[i] & 0x7fff) != 0) {
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is_signed = true;
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break;
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}
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}
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target_format = is_signed ? Image::FORMAT_BPTC_RGBF : Image::FORMAT_BPTC_RGBFU;
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} else {
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p_image->convert(Image::FORMAT_RGBA8); //still uses RGBA to convert
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}
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const uint8_t *rb = p_image->get_data().ptr();
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Vector<uint8_t> data;
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int target_size = Image::get_image_data_size(w, h, target_format, p_image->has_mipmaps());
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int mm_count = p_image->has_mipmaps() ? Image::get_image_required_mipmaps(w, h, target_format) : 0;
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data.resize(target_size);
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int shift = Image::get_format_pixel_rshift(target_format);
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uint8_t *wb = data.ptrw();
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int dst_ofs = 0;
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CVTTCompressionJobQueue job_queue;
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job_queue.job_params.is_hdr = is_hdr;
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job_queue.job_params.is_signed = is_signed;
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job_queue.job_params.options = options;
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job_queue.job_params.bytes_per_pixel = is_hdr ? 6 : 4;
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cvtt::Kernels::ConfigureBC7EncodingPlanFromQuality(job_queue.job_params.bc7_plan, 5);
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// Amdahl's law (Wikipedia)
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// If a program needs 20 hours to complete using a single thread, but a one-hour portion of the program cannot be parallelized,
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// therefore only the remaining 19 hours (p = 0.95) of execution time can be parallelized, then regardless of how many threads are devoted
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// to a parallelized execution of this program, the minimum execution time cannot be less than one hour.
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//
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// The number of executions with different inputs can be increased while the latency is the same.
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Vector<CVTTCompressionRowTask> tasks;
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for (int i = 0; i <= mm_count; i++) {
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int bw = w % 4 != 0 ? w + (4 - w % 4) : w;
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int bh = h % 4 != 0 ? h + (4 - h % 4) : h;
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int src_ofs = p_image->get_mipmap_offset(i);
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const uint8_t *in_bytes = &rb[src_ofs];
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uint8_t *out_bytes = &wb[dst_ofs];
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for (int y_start = 0; y_start < h; y_start += 4) {
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CVTTCompressionRowTask row_task;
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row_task.width = w;
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row_task.height = h;
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row_task.y_start = y_start;
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row_task.in_mm_bytes = in_bytes;
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row_task.out_mm_bytes = out_bytes;
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_digest_row_task(job_queue.job_params, row_task);
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out_bytes += 16 * (bw / 4);
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}
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dst_ofs += (MAX(4, bw) * MAX(4, bh)) >> shift;
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w = MAX(w / 2, 1);
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h = MAX(h / 2, 1);
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}
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p_image->set_data(p_image->get_width(), p_image->get_height(), p_image->has_mipmaps(), target_format, data);
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}
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void image_decompress_cvtt(Image *p_image) {
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Image::Format target_format;
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bool is_signed = false;
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bool is_hdr = false;
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Image::Format input_format = p_image->get_format();
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switch (input_format) {
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case Image::FORMAT_BPTC_RGBA:
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target_format = Image::FORMAT_RGBA8;
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break;
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case Image::FORMAT_BPTC_RGBF:
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case Image::FORMAT_BPTC_RGBFU:
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target_format = Image::FORMAT_RGBH;
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is_signed = (input_format == Image::FORMAT_BPTC_RGBF);
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is_hdr = true;
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break;
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default:
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return; // Invalid input format
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};
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int w = p_image->get_width();
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int h = p_image->get_height();
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const uint8_t *rb = p_image->get_data().ptr();
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Vector<uint8_t> data;
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int target_size = Image::get_image_data_size(w, h, target_format, p_image->has_mipmaps());
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int mm_count = p_image->get_mipmap_count();
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data.resize(target_size);
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uint8_t *wb = data.ptrw();
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int bytes_per_pixel = is_hdr ? 6 : 4;
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int dst_ofs = 0;
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for (int i = 0; i <= mm_count; i++) {
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int src_ofs = p_image->get_mipmap_offset(i);
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const uint8_t *in_bytes = &rb[src_ofs];
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uint8_t *out_bytes = &wb[dst_ofs];
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cvtt::PixelBlockU8 output_blocks_ldr[cvtt::NumParallelBlocks];
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cvtt::PixelBlockF16 output_blocks_hdr[cvtt::NumParallelBlocks];
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for (int y_start = 0; y_start < h; y_start += 4) {
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int y_end = y_start + 4;
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for (int x_start = 0; x_start < w; x_start += 4 * cvtt::NumParallelBlocks) {
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int x_end = x_start + 4 * cvtt::NumParallelBlocks;
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uint8_t input_blocks[16 * cvtt::NumParallelBlocks];
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memset(input_blocks, 0, sizeof(input_blocks));
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unsigned int num_real_blocks = ((w - x_start) + 3) / 4;
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if (num_real_blocks > cvtt::NumParallelBlocks) {
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num_real_blocks = cvtt::NumParallelBlocks;
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}
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memcpy(input_blocks, in_bytes, 16 * num_real_blocks);
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in_bytes += 16 * num_real_blocks;
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if (is_hdr) {
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if (is_signed) {
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cvtt::Kernels::DecodeBC6HS(output_blocks_hdr, input_blocks);
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} else {
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cvtt::Kernels::DecodeBC6HU(output_blocks_hdr, input_blocks);
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}
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} else {
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cvtt::Kernels::DecodeBC7(output_blocks_ldr, input_blocks);
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}
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for (int y = y_start; y < y_end; y++) {
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int first_input_element = (y - y_start) * 4;
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uint8_t *row_start;
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if (y >= h) {
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row_start = out_bytes + (h - 1) * (w * bytes_per_pixel);
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} else {
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row_start = out_bytes + y * (w * bytes_per_pixel);
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}
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for (int x = x_start; x < x_end; x++) {
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uint8_t *pixel_start;
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if (x >= w) {
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pixel_start = row_start + (w - 1) * bytes_per_pixel;
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} else {
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pixel_start = row_start + x * bytes_per_pixel;
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}
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int block_index = (x - x_start) / 4;
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int block_element = (x - x_start) % 4 + first_input_element;
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if (is_hdr) {
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memcpy(pixel_start, output_blocks_hdr[block_index].m_pixels[block_element], bytes_per_pixel);
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} else {
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memcpy(pixel_start, output_blocks_ldr[block_index].m_pixels[block_element], bytes_per_pixel);
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}
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}
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}
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}
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}
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dst_ofs += w * h * bytes_per_pixel;
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w >>= 1;
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h >>= 1;
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}
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p_image->set_data(p_image->get_width(), p_image->get_height(), p_image->has_mipmaps(), target_format, data);
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}
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