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
222 lines
7.8 KiB
C
222 lines
7.8 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 implementation part of all CPU kernels.
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*
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* The idea is that particular .cpp files sets needed optimization flags and
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* simply includes this file without worry of copying actual implementation over.
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*/
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#include "kernel/kernel_compat_cpu.h"
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#ifndef KERNEL_STUB
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# ifndef __SPLIT_KERNEL__
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# include "kernel/kernel_math.h"
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# include "kernel/kernel_types.h"
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# include "kernel/split/kernel_split_data.h"
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# include "kernel/kernel_globals.h"
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# include "kernel/kernel_color.h"
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# include "kernel/kernels/cpu/kernel_cpu_image.h"
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# include "kernel/kernel_film.h"
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# include "kernel/kernel_path.h"
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# include "kernel/kernel_path_branched.h"
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# include "kernel/kernel_bake.h"
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# else
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# include "kernel/split/kernel_split_common.h"
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# include "kernel/split/kernel_data_init.h"
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# include "kernel/split/kernel_path_init.h"
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# include "kernel/split/kernel_scene_intersect.h"
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# include "kernel/split/kernel_lamp_emission.h"
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# include "kernel/split/kernel_do_volume.h"
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# include "kernel/split/kernel_queue_enqueue.h"
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# include "kernel/split/kernel_indirect_background.h"
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# include "kernel/split/kernel_shader_setup.h"
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# include "kernel/split/kernel_shader_sort.h"
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# include "kernel/split/kernel_shader_eval.h"
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# include "kernel/split/kernel_holdout_emission_blurring_pathtermination_ao.h"
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# include "kernel/split/kernel_subsurface_scatter.h"
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# include "kernel/split/kernel_direct_lighting.h"
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# include "kernel/split/kernel_shadow_blocked_ao.h"
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# include "kernel/split/kernel_shadow_blocked_dl.h"
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# include "kernel/split/kernel_enqueue_inactive.h"
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# include "kernel/split/kernel_next_iteration_setup.h"
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# include "kernel/split/kernel_indirect_subsurface.h"
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# include "kernel/split/kernel_buffer_update.h"
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# include "kernel/split/kernel_adaptive_stopping.h"
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# include "kernel/split/kernel_adaptive_filter_x.h"
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# include "kernel/split/kernel_adaptive_filter_y.h"
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# include "kernel/split/kernel_adaptive_adjust_samples.h"
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# endif /* __SPLIT_KERNEL__ */
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#else
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# define STUB_ASSERT(arch, name) \
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assert(!(#name " kernel stub for architecture " #arch " was called!"))
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# ifdef __SPLIT_KERNEL__
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# include "kernel/split/kernel_data_init.h"
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# endif /* __SPLIT_KERNEL__ */
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#endif /* KERNEL_STUB */
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CCL_NAMESPACE_BEGIN
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#ifndef __SPLIT_KERNEL__
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/* Path Tracing */
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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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{
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# ifdef KERNEL_STUB
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STUB_ASSERT(KERNEL_ARCH, path_trace);
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# else
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# ifdef __BRANCHED_PATH__
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if (kernel_data.integrator.branched) {
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kernel_branched_path_trace(kg, buffer, sample, x, y, offset, stride);
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}
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else
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# endif
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{
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kernel_path_trace(kg, buffer, sample, x, y, offset, stride);
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}
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# endif /* KERNEL_STUB */
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}
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/* Film */
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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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{
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# ifdef KERNEL_STUB
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STUB_ASSERT(KERNEL_ARCH, convert_to_byte);
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# else
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kernel_film_convert_to_byte(kg, rgba, buffer, sample_scale, x, y, offset, stride);
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# endif /* KERNEL_STUB */
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}
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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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{
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# ifdef KERNEL_STUB
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STUB_ASSERT(KERNEL_ARCH, convert_to_half_float);
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# else
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kernel_film_convert_to_half_float(kg, rgba, buffer, sample_scale, x, y, offset, stride);
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# endif /* KERNEL_STUB */
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}
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/* Shader Evaluate */
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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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{
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# ifdef KERNEL_STUB
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STUB_ASSERT(KERNEL_ARCH, shader);
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# else
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if (type >= SHADER_EVAL_BAKE) {
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# ifdef __BAKING__
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kernel_bake_evaluate(kg, input, output, (ShaderEvalType)type, filter, i, offset, sample);
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# endif
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}
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else if (type == SHADER_EVAL_DISPLACE) {
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kernel_displace_evaluate(kg, input, output, i);
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}
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else {
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kernel_background_evaluate(kg, input, output, i);
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}
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# endif /* KERNEL_STUB */
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}
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#else /* __SPLIT_KERNEL__ */
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/* Split Kernel Path Tracing */
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# ifdef KERNEL_STUB
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# define DEFINE_SPLIT_KERNEL_FUNCTION(name) \
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void KERNEL_FUNCTION_FULL_NAME(name)(KernelGlobals * kg, KernelData * /*data*/) \
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{ \
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STUB_ASSERT(KERNEL_ARCH, name); \
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}
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# define DEFINE_SPLIT_KERNEL_FUNCTION_LOCALS(name, type) \
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void KERNEL_FUNCTION_FULL_NAME(name)(KernelGlobals * kg, KernelData * /*data*/) \
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{ \
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STUB_ASSERT(KERNEL_ARCH, name); \
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}
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# else
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# define DEFINE_SPLIT_KERNEL_FUNCTION(name) \
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void KERNEL_FUNCTION_FULL_NAME(name)(KernelGlobals * kg, KernelData * /*data*/) \
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{ \
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kernel_##name(kg); \
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}
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# define DEFINE_SPLIT_KERNEL_FUNCTION_LOCALS(name, type) \
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void KERNEL_FUNCTION_FULL_NAME(name)(KernelGlobals * kg, KernelData * /*data*/) \
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{ \
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ccl_local type locals; \
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kernel_##name(kg, &locals); \
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}
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# endif /* KERNEL_STUB */
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DEFINE_SPLIT_KERNEL_FUNCTION(path_init)
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DEFINE_SPLIT_KERNEL_FUNCTION(scene_intersect)
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DEFINE_SPLIT_KERNEL_FUNCTION(lamp_emission)
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DEFINE_SPLIT_KERNEL_FUNCTION(do_volume)
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DEFINE_SPLIT_KERNEL_FUNCTION_LOCALS(queue_enqueue, QueueEnqueueLocals)
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DEFINE_SPLIT_KERNEL_FUNCTION(indirect_background)
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DEFINE_SPLIT_KERNEL_FUNCTION_LOCALS(shader_setup, uint)
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DEFINE_SPLIT_KERNEL_FUNCTION_LOCALS(shader_sort, ShaderSortLocals)
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DEFINE_SPLIT_KERNEL_FUNCTION(shader_eval)
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DEFINE_SPLIT_KERNEL_FUNCTION_LOCALS(holdout_emission_blurring_pathtermination_ao,
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BackgroundAOLocals)
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DEFINE_SPLIT_KERNEL_FUNCTION(subsurface_scatter)
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DEFINE_SPLIT_KERNEL_FUNCTION_LOCALS(direct_lighting, uint)
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DEFINE_SPLIT_KERNEL_FUNCTION(shadow_blocked_ao)
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DEFINE_SPLIT_KERNEL_FUNCTION(shadow_blocked_dl)
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DEFINE_SPLIT_KERNEL_FUNCTION_LOCALS(enqueue_inactive, uint)
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DEFINE_SPLIT_KERNEL_FUNCTION_LOCALS(next_iteration_setup, uint)
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DEFINE_SPLIT_KERNEL_FUNCTION(indirect_subsurface)
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DEFINE_SPLIT_KERNEL_FUNCTION_LOCALS(buffer_update, uint)
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DEFINE_SPLIT_KERNEL_FUNCTION(adaptive_stopping)
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DEFINE_SPLIT_KERNEL_FUNCTION(adaptive_filter_x)
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DEFINE_SPLIT_KERNEL_FUNCTION(adaptive_filter_y)
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DEFINE_SPLIT_KERNEL_FUNCTION(adaptive_adjust_samples)
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#endif /* __SPLIT_KERNEL__ */
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#undef KERNEL_STUB
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#undef STUB_ASSERT
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#undef KERNEL_ARCH
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CCL_NAMESPACE_END
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