343 lines
12 KiB
C++
343 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) 2007-2022 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2022 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_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->create(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->create(p_image->get_width(), p_image->get_height(), p_image->has_mipmaps(), target_format, data);
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}
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