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
390 lines
14 KiB
C++
390 lines
14 KiB
C++
/*
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* Copyright 2011-2016 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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#include "device/device_split_kernel.h"
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#include "kernel/kernel_types.h"
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#include "kernel/split/kernel_split_data_types.h"
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#include "util/util_logging.h"
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#include "util/util_time.h"
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CCL_NAMESPACE_BEGIN
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static const double alpha = 0.1; /* alpha for rolling average */
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DeviceSplitKernel::DeviceSplitKernel(Device *device)
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: device(device),
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split_data(device, "split_data"),
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ray_state(device, "ray_state", MEM_READ_WRITE),
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queue_index(device, "queue_index"),
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use_queues_flag(device, "use_queues_flag"),
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work_pool_wgs(device, "work_pool_wgs"),
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kernel_data_initialized(false)
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{
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avg_time_per_sample = 0.0;
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kernel_path_init = NULL;
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kernel_scene_intersect = NULL;
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kernel_lamp_emission = NULL;
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kernel_do_volume = NULL;
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kernel_queue_enqueue = NULL;
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kernel_indirect_background = NULL;
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kernel_shader_setup = NULL;
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kernel_shader_sort = NULL;
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kernel_shader_eval = NULL;
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kernel_holdout_emission_blurring_pathtermination_ao = NULL;
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kernel_subsurface_scatter = NULL;
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kernel_direct_lighting = NULL;
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kernel_shadow_blocked_ao = NULL;
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kernel_shadow_blocked_dl = NULL;
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kernel_enqueue_inactive = NULL;
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kernel_next_iteration_setup = NULL;
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kernel_indirect_subsurface = NULL;
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kernel_buffer_update = NULL;
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kernel_adaptive_stopping = NULL;
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kernel_adaptive_filter_x = NULL;
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kernel_adaptive_filter_y = NULL;
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kernel_adaptive_adjust_samples = NULL;
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}
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DeviceSplitKernel::~DeviceSplitKernel()
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{
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split_data.free();
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ray_state.free();
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use_queues_flag.free();
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queue_index.free();
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work_pool_wgs.free();
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delete kernel_path_init;
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delete kernel_scene_intersect;
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delete kernel_lamp_emission;
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delete kernel_do_volume;
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delete kernel_queue_enqueue;
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delete kernel_indirect_background;
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delete kernel_shader_setup;
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delete kernel_shader_sort;
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delete kernel_shader_eval;
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delete kernel_holdout_emission_blurring_pathtermination_ao;
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delete kernel_subsurface_scatter;
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delete kernel_direct_lighting;
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delete kernel_shadow_blocked_ao;
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delete kernel_shadow_blocked_dl;
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delete kernel_enqueue_inactive;
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delete kernel_next_iteration_setup;
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delete kernel_indirect_subsurface;
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delete kernel_buffer_update;
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delete kernel_adaptive_stopping;
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delete kernel_adaptive_filter_x;
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delete kernel_adaptive_filter_y;
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delete kernel_adaptive_adjust_samples;
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}
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bool DeviceSplitKernel::load_kernels(const DeviceRequestedFeatures &requested_features)
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{
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#define LOAD_KERNEL(name) \
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kernel_##name = get_split_kernel_function(#name, requested_features); \
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if (!kernel_##name) { \
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device->set_error(string("Split kernel error: failed to load kernel_") + #name); \
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return false; \
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}
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LOAD_KERNEL(path_init);
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LOAD_KERNEL(scene_intersect);
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LOAD_KERNEL(lamp_emission);
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if (requested_features.use_volume) {
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LOAD_KERNEL(do_volume);
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}
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LOAD_KERNEL(queue_enqueue);
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LOAD_KERNEL(indirect_background);
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LOAD_KERNEL(shader_setup);
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LOAD_KERNEL(shader_sort);
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LOAD_KERNEL(shader_eval);
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LOAD_KERNEL(holdout_emission_blurring_pathtermination_ao);
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LOAD_KERNEL(subsurface_scatter);
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LOAD_KERNEL(direct_lighting);
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LOAD_KERNEL(shadow_blocked_ao);
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LOAD_KERNEL(shadow_blocked_dl);
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LOAD_KERNEL(enqueue_inactive);
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LOAD_KERNEL(next_iteration_setup);
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LOAD_KERNEL(indirect_subsurface);
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LOAD_KERNEL(buffer_update);
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LOAD_KERNEL(adaptive_stopping);
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LOAD_KERNEL(adaptive_filter_x);
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LOAD_KERNEL(adaptive_filter_y);
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LOAD_KERNEL(adaptive_adjust_samples);
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#undef LOAD_KERNEL
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/* Re-initialiaze kernel-dependent data when kernels change. */
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kernel_data_initialized = false;
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return true;
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}
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size_t DeviceSplitKernel::max_elements_for_max_buffer_size(device_memory &kg,
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device_memory &data,
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uint64_t max_buffer_size)
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{
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uint64_t size_per_element = state_buffer_size(kg, data, 1024) / 1024;
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VLOG(1) << "Split state element size: " << string_human_readable_number(size_per_element)
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<< " bytes. (" << string_human_readable_size(size_per_element) << ").";
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return max_buffer_size / size_per_element;
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}
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bool DeviceSplitKernel::path_trace(DeviceTask *task,
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RenderTile &tile,
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device_memory &kgbuffer,
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device_memory &kernel_data)
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{
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if (device->have_error()) {
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return false;
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}
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/* Allocate all required global memory once. */
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if (!kernel_data_initialized) {
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kernel_data_initialized = true;
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/* Set local size */
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int2 lsize = split_kernel_local_size();
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local_size[0] = lsize[0];
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local_size[1] = lsize[1];
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/* Set global size */
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int2 gsize = split_kernel_global_size(kgbuffer, kernel_data, task);
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/* Make sure that set work size is a multiple of local
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* work size dimensions.
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*/
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global_size[0] = round_up(gsize[0], local_size[0]);
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global_size[1] = round_up(gsize[1], local_size[1]);
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int num_global_elements = global_size[0] * global_size[1];
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assert(num_global_elements % WORK_POOL_SIZE == 0);
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/* Calculate max groups */
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/* Denotes the maximum work groups possible w.r.t. current requested tile size. */
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unsigned int work_pool_size = (device->info.type == DEVICE_CPU) ? WORK_POOL_SIZE_CPU :
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WORK_POOL_SIZE_GPU;
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unsigned int max_work_groups = num_global_elements / work_pool_size + 1;
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/* Allocate work_pool_wgs memory. */
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work_pool_wgs.alloc_to_device(max_work_groups);
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queue_index.alloc_to_device(NUM_QUEUES);
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use_queues_flag.alloc_to_device(1);
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split_data.alloc_to_device(state_buffer_size(kgbuffer, kernel_data, num_global_elements));
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ray_state.alloc(num_global_elements);
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}
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/* Number of elements in the global state buffer */
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int num_global_elements = global_size[0] * global_size[1];
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#define ENQUEUE_SPLIT_KERNEL(name, global_size, local_size) \
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if (device->have_error()) { \
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return false; \
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} \
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if (!kernel_##name->enqueue( \
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KernelDimensions(global_size, local_size), kgbuffer, kernel_data)) { \
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return false; \
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}
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tile.sample = tile.start_sample;
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/* for exponential increase between tile updates */
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int time_multiplier = 1;
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while (tile.sample < tile.start_sample + tile.num_samples) {
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/* to keep track of how long it takes to run a number of samples */
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double start_time = time_dt();
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/* initial guess to start rolling average */
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const int initial_num_samples = 1;
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/* approx number of samples per second */
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const int samples_per_second = (avg_time_per_sample > 0.0) ?
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int(double(time_multiplier) / avg_time_per_sample) + 1 :
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initial_num_samples;
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RenderTile subtile = tile;
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subtile.start_sample = tile.sample;
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subtile.num_samples = samples_per_second;
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if (task->adaptive_sampling.use) {
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subtile.num_samples = task->adaptive_sampling.align_dynamic_samples(subtile.start_sample,
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subtile.num_samples);
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}
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/* Don't go beyond requested number of samples. */
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subtile.num_samples = min(subtile.num_samples,
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tile.start_sample + tile.num_samples - tile.sample);
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if (device->have_error()) {
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return false;
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}
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/* reset state memory here as global size for data_init
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* kernel might not be large enough to do in kernel
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*/
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work_pool_wgs.zero_to_device();
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split_data.zero_to_device();
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ray_state.zero_to_device();
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if (!enqueue_split_kernel_data_init(KernelDimensions(global_size, local_size),
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subtile,
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num_global_elements,
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kgbuffer,
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kernel_data,
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split_data,
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ray_state,
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queue_index,
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use_queues_flag,
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work_pool_wgs)) {
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return false;
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}
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ENQUEUE_SPLIT_KERNEL(path_init, global_size, local_size);
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bool activeRaysAvailable = true;
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double cancel_time = DBL_MAX;
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while (activeRaysAvailable) {
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/* Do path-iteration in host [Enqueue Path-iteration kernels. */
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for (int PathIter = 0; PathIter < 16; PathIter++) {
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ENQUEUE_SPLIT_KERNEL(scene_intersect, global_size, local_size);
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ENQUEUE_SPLIT_KERNEL(lamp_emission, global_size, local_size);
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if (kernel_do_volume) {
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ENQUEUE_SPLIT_KERNEL(do_volume, global_size, local_size);
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}
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ENQUEUE_SPLIT_KERNEL(queue_enqueue, global_size, local_size);
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ENQUEUE_SPLIT_KERNEL(indirect_background, global_size, local_size);
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ENQUEUE_SPLIT_KERNEL(shader_setup, global_size, local_size);
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ENQUEUE_SPLIT_KERNEL(shader_sort, global_size, local_size);
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ENQUEUE_SPLIT_KERNEL(shader_eval, global_size, local_size);
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ENQUEUE_SPLIT_KERNEL(
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holdout_emission_blurring_pathtermination_ao, global_size, local_size);
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ENQUEUE_SPLIT_KERNEL(subsurface_scatter, global_size, local_size);
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ENQUEUE_SPLIT_KERNEL(queue_enqueue, global_size, local_size);
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ENQUEUE_SPLIT_KERNEL(direct_lighting, global_size, local_size);
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ENQUEUE_SPLIT_KERNEL(shadow_blocked_ao, global_size, local_size);
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ENQUEUE_SPLIT_KERNEL(shadow_blocked_dl, global_size, local_size);
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ENQUEUE_SPLIT_KERNEL(enqueue_inactive, global_size, local_size);
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ENQUEUE_SPLIT_KERNEL(next_iteration_setup, global_size, local_size);
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ENQUEUE_SPLIT_KERNEL(indirect_subsurface, global_size, local_size);
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ENQUEUE_SPLIT_KERNEL(queue_enqueue, global_size, local_size);
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ENQUEUE_SPLIT_KERNEL(buffer_update, global_size, local_size);
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if (task->get_cancel() && cancel_time == DBL_MAX) {
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/* Wait up to twice as many seconds for current samples to finish
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* to avoid artifacts in render result from ending too soon.
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*/
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cancel_time = time_dt() + 2.0 * time_multiplier;
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}
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if (time_dt() > cancel_time) {
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return true;
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}
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}
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/* Decide if we should exit path-iteration in host. */
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ray_state.copy_from_device(0, global_size[0] * global_size[1], 1);
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activeRaysAvailable = false;
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for (int rayStateIter = 0; rayStateIter < global_size[0] * global_size[1]; ++rayStateIter) {
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if (!IS_STATE(ray_state.data(), rayStateIter, RAY_INACTIVE)) {
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if (IS_STATE(ray_state.data(), rayStateIter, RAY_INVALID)) {
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/* Something went wrong, abort to avoid looping endlessly. */
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device->set_error("Split kernel error: invalid ray state");
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return false;
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}
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/* Not all rays are RAY_INACTIVE. */
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activeRaysAvailable = true;
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break;
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}
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}
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if (time_dt() > cancel_time) {
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return true;
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}
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}
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int filter_sample = tile.sample + subtile.num_samples - 1;
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if (task->adaptive_sampling.use && task->adaptive_sampling.need_filter(filter_sample)) {
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size_t buffer_size[2];
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buffer_size[0] = round_up(tile.w, local_size[0]);
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buffer_size[1] = round_up(tile.h, local_size[1]);
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kernel_adaptive_stopping->enqueue(
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KernelDimensions(buffer_size, local_size), kgbuffer, kernel_data);
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buffer_size[0] = round_up(tile.h, local_size[0]);
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buffer_size[1] = round_up(1, local_size[1]);
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kernel_adaptive_filter_x->enqueue(
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KernelDimensions(buffer_size, local_size), kgbuffer, kernel_data);
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buffer_size[0] = round_up(tile.w, local_size[0]);
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buffer_size[1] = round_up(1, local_size[1]);
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kernel_adaptive_filter_y->enqueue(
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KernelDimensions(buffer_size, local_size), kgbuffer, kernel_data);
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}
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double time_per_sample = ((time_dt() - start_time) / subtile.num_samples);
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if (avg_time_per_sample == 0.0) {
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/* start rolling average */
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avg_time_per_sample = time_per_sample;
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}
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else {
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avg_time_per_sample = alpha * time_per_sample + (1.0 - alpha) * avg_time_per_sample;
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}
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#undef ENQUEUE_SPLIT_KERNEL
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tile.sample += subtile.num_samples;
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task->update_progress(&tile, tile.w * tile.h * subtile.num_samples);
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time_multiplier = min(time_multiplier << 1, 10);
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if (task->get_cancel()) {
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return true;
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}
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}
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if (task->adaptive_sampling.use) {
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/* Reset the start samples. */
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RenderTile subtile = tile;
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subtile.start_sample = tile.start_sample;
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subtile.num_samples = tile.sample - tile.start_sample;
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enqueue_split_kernel_data_init(KernelDimensions(global_size, local_size),
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subtile,
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num_global_elements,
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kgbuffer,
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kernel_data,
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split_data,
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ray_state,
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queue_index,
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use_queues_flag,
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work_pool_wgs);
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size_t buffer_size[2];
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buffer_size[0] = round_up(tile.w, local_size[0]);
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buffer_size[1] = round_up(tile.h, local_size[1]);
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kernel_adaptive_adjust_samples->enqueue(
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KernelDimensions(buffer_size, local_size), kgbuffer, kernel_data);
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}
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return true;
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}
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CCL_NAMESPACE_END
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