forked from bartvdbraak/blender
51e898324d
This feature takes some inspiration from "RenderMan: An Advanced Path Tracing Architecture for Movie Rendering" and "A Hierarchical Automatic Stopping Condition for Monte Carlo Global Illumination" The basic principle is as follows: While samples are being added to a pixel, the adaptive sampler writes half of the samples to a separate buffer. This gives it two separate estimates of the same pixel, and by comparing their difference it estimates convergence. Once convergence drops below a given threshold, the pixel is considered done. When a pixel has not converged yet and needs more samples than the minimum, its immediate neighbors are also set to take more samples. This is done in order to more reliably detect sharp features such as caustics. A 3x3 box filter that is run periodically over the tile buffer is used for that purpose. After a tile has finished rendering, the values of all passes are scaled as if they were rendered with the full number of samples. This way, any code operating on these buffers, for example the denoiser, does not need to be changed for per-pixel sample counts. Reviewed By: brecht, #cycles Differential Revision: https://developer.blender.org/D4686
140 lines
3.5 KiB
C++
140 lines
3.5 KiB
C++
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __DEVICE_TASK_H__
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#define __DEVICE_TASK_H__
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#include "device/device_memory.h"
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#include "util/util_function.h"
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#include "util/util_list.h"
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#include "util/util_task.h"
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CCL_NAMESPACE_BEGIN
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/* Device Task */
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class Device;
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class RenderBuffers;
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class RenderTile;
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class Tile;
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class DenoiseParams {
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public:
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/* Pixel radius for neighboring pixels to take into account. */
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int radius;
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/* Controls neighbor pixel weighting for the denoising filter. */
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float strength;
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/* Preserve more or less detail based on feature passes. */
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float feature_strength;
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/* When removing pixels that don't carry information,
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* use a relative threshold instead of an absolute one. */
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bool relative_pca;
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/* How many frames before and after the current center frame are included. */
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int neighbor_frames;
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/* Clamp the input to the range of +-1e8. Should be enough for any legitimate data. */
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bool clamp_input;
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/* Passes handed over to the OptiX denoiser (default to color + albedo). */
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int optix_input_passes;
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DenoiseParams()
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{
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radius = 8;
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strength = 0.5f;
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feature_strength = 0.5f;
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relative_pca = false;
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neighbor_frames = 2;
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clamp_input = true;
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optix_input_passes = 2;
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}
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};
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class AdaptiveSampling {
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public:
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AdaptiveSampling();
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int align_static_samples(int samples) const;
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int align_dynamic_samples(int offset, int samples) const;
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bool need_filter(int sample) const;
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bool use;
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int adaptive_step;
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int min_samples;
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};
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class DeviceTask : public Task {
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public:
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typedef enum { RENDER, FILM_CONVERT, SHADER, DENOISE_BUFFER } Type;
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Type type;
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int x, y, w, h;
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device_ptr rgba_byte;
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device_ptr rgba_half;
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device_ptr buffer;
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int sample;
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int num_samples;
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int offset, stride;
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device_ptr shader_input;
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device_ptr shader_output;
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int shader_eval_type;
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int shader_filter;
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int shader_x, shader_w;
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RenderBuffers *buffers;
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explicit DeviceTask(Type type = RENDER);
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int get_subtask_count(int num, int max_size = 0);
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void split(list<DeviceTask> &tasks, int num, int max_size = 0);
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void update_progress(RenderTile *rtile, int pixel_samples = -1);
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function<bool(Device *device, RenderTile &, uint)> acquire_tile;
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function<void(long, int)> update_progress_sample;
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function<void(RenderTile &)> update_tile_sample;
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function<void(RenderTile &)> release_tile;
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function<bool()> get_cancel;
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function<void(RenderTile *, Device *)> map_neighbor_tiles;
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function<void(RenderTile *, Device *)> unmap_neighbor_tiles;
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uint tile_types;
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DenoiseParams denoising;
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bool denoising_from_render;
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vector<int> denoising_frames;
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bool denoising_do_filter;
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bool denoising_use_optix;
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bool denoising_write_passes;
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int pass_stride;
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int frame_stride;
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int target_pass_stride;
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int pass_denoising_data;
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int pass_denoising_clean;
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bool need_finish_queue;
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bool integrator_branched;
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AdaptiveSampling adaptive_sampling;
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protected:
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double last_update_time;
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};
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CCL_NAMESPACE_END
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#endif /* __DEVICE_TASK_H__ */
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