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
98 lines
4.6 KiB
C++
98 lines
4.6 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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/* Templated common declaration part of all CPU kernels. */
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void KERNEL_FUNCTION_FULL_NAME(path_trace)(
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KernelGlobals *kg, float *buffer, int sample, int x, int y, int offset, int stride);
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void KERNEL_FUNCTION_FULL_NAME(convert_to_byte)(KernelGlobals *kg,
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uchar4 *rgba,
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float *buffer,
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float sample_scale,
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int x,
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int y,
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int offset,
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int stride);
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void KERNEL_FUNCTION_FULL_NAME(convert_to_half_float)(KernelGlobals *kg,
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uchar4 *rgba,
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float *buffer,
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float sample_scale,
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int x,
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int y,
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int offset,
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int stride);
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void KERNEL_FUNCTION_FULL_NAME(shader)(KernelGlobals *kg,
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uint4 *input,
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float4 *output,
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int type,
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int filter,
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int i,
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int offset,
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int sample);
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/* Split kernels */
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void KERNEL_FUNCTION_FULL_NAME(data_init)(KernelGlobals *kg,
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ccl_constant KernelData *data,
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ccl_global void *split_data_buffer,
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int num_elements,
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ccl_global char *ray_state,
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int start_sample,
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int end_sample,
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int sx,
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int sy,
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int sw,
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int sh,
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int offset,
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int stride,
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ccl_global int *Queue_index,
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int queuesize,
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ccl_global char *use_queues_flag,
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ccl_global unsigned int *work_pool_wgs,
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unsigned int num_samples,
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ccl_global float *buffer);
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#define DECLARE_SPLIT_KERNEL_FUNCTION(name) \
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void KERNEL_FUNCTION_FULL_NAME(name)(KernelGlobals * kg, KernelData * data);
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DECLARE_SPLIT_KERNEL_FUNCTION(path_init)
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DECLARE_SPLIT_KERNEL_FUNCTION(scene_intersect)
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DECLARE_SPLIT_KERNEL_FUNCTION(lamp_emission)
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DECLARE_SPLIT_KERNEL_FUNCTION(do_volume)
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DECLARE_SPLIT_KERNEL_FUNCTION(queue_enqueue)
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DECLARE_SPLIT_KERNEL_FUNCTION(indirect_background)
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DECLARE_SPLIT_KERNEL_FUNCTION(shader_setup)
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DECLARE_SPLIT_KERNEL_FUNCTION(shader_sort)
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DECLARE_SPLIT_KERNEL_FUNCTION(shader_eval)
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DECLARE_SPLIT_KERNEL_FUNCTION(holdout_emission_blurring_pathtermination_ao)
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DECLARE_SPLIT_KERNEL_FUNCTION(subsurface_scatter)
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DECLARE_SPLIT_KERNEL_FUNCTION(direct_lighting)
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DECLARE_SPLIT_KERNEL_FUNCTION(shadow_blocked_ao)
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DECLARE_SPLIT_KERNEL_FUNCTION(shadow_blocked_dl)
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DECLARE_SPLIT_KERNEL_FUNCTION(enqueue_inactive)
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DECLARE_SPLIT_KERNEL_FUNCTION(next_iteration_setup)
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DECLARE_SPLIT_KERNEL_FUNCTION(indirect_subsurface)
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DECLARE_SPLIT_KERNEL_FUNCTION(buffer_update)
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DECLARE_SPLIT_KERNEL_FUNCTION(adaptive_stopping)
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DECLARE_SPLIT_KERNEL_FUNCTION(adaptive_filter_x)
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DECLARE_SPLIT_KERNEL_FUNCTION(adaptive_filter_y)
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DECLARE_SPLIT_KERNEL_FUNCTION(adaptive_adjust_samples)
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#undef KERNEL_ARCH
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