5bb677e592
This was originally done with the first sample in the kernel for better performance, but it doesn't work anymore with atomics. Any benefit was very minor anyway, too small to measure it seems.
373 lines
13 KiB
C
373 lines
13 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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CCL_NAMESPACE_BEGIN
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ccl_device_inline void kernel_write_pass_float(ccl_global float *buffer, float value)
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{
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ccl_global float *buf = buffer;
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#if defined(__SPLIT_KERNEL__)
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atomic_add_and_fetch_float(buf, value);
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#else
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*buf += value;
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#endif /* __SPLIT_KERNEL__ */
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}
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ccl_device_inline void kernel_write_pass_float3(ccl_global float *buffer, float3 value)
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{
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#if defined(__SPLIT_KERNEL__)
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ccl_global float *buf_x = buffer + 0;
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ccl_global float *buf_y = buffer + 1;
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ccl_global float *buf_z = buffer + 2;
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atomic_add_and_fetch_float(buf_x, value.x);
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atomic_add_and_fetch_float(buf_y, value.y);
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atomic_add_and_fetch_float(buf_z, value.z);
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#else
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ccl_global float3 *buf = (ccl_global float3*)buffer;
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*buf += value;
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#endif /* __SPLIT_KERNEL__ */
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}
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ccl_device_inline void kernel_write_pass_float4(ccl_global float *buffer, float4 value)
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{
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#if defined(__SPLIT_KERNEL__)
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ccl_global float *buf_x = buffer + 0;
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ccl_global float *buf_y = buffer + 1;
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ccl_global float *buf_z = buffer + 2;
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ccl_global float *buf_w = buffer + 3;
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atomic_add_and_fetch_float(buf_x, value.x);
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atomic_add_and_fetch_float(buf_y, value.y);
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atomic_add_and_fetch_float(buf_z, value.z);
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atomic_add_and_fetch_float(buf_w, value.w);
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#else
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ccl_global float4 *buf = (ccl_global float4*)buffer;
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*buf += value;
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#endif /* __SPLIT_KERNEL__ */
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}
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#ifdef __DENOISING_FEATURES__
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ccl_device_inline void kernel_write_pass_float_variance(ccl_global float *buffer, float value)
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{
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kernel_write_pass_float(buffer, value);
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/* The online one-pass variance update that's used for the megakernel can't easily be implemented
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* with atomics, so for the split kernel the E[x^2] - 1/N * (E[x])^2 fallback is used. */
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kernel_write_pass_float(buffer+1, value*value);
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}
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# if defined(__SPLIT_KERNEL__)
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# define kernel_write_pass_float3_unaligned kernel_write_pass_float3
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# else
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ccl_device_inline void kernel_write_pass_float3_unaligned(ccl_global float *buffer, float3 value)
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{
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buffer[0] += value.x;
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buffer[1] += value.y;
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buffer[2] += value.z;
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}
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# endif
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ccl_device_inline void kernel_write_pass_float3_variance(ccl_global float *buffer, float3 value)
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{
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kernel_write_pass_float3_unaligned(buffer, value);
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kernel_write_pass_float3_unaligned(buffer+3, value*value);
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}
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ccl_device_inline void kernel_write_denoising_shadow(KernelGlobals *kg, ccl_global float *buffer,
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int sample, float path_total, float path_total_shaded)
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{
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if(kernel_data.film.pass_denoising_data == 0)
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return;
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buffer += (sample & 1)? DENOISING_PASS_SHADOW_B : DENOISING_PASS_SHADOW_A;
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path_total = ensure_finite(path_total);
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path_total_shaded = ensure_finite(path_total_shaded);
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kernel_write_pass_float(buffer, path_total);
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kernel_write_pass_float(buffer+1, path_total_shaded);
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float value = path_total_shaded / max(path_total, 1e-7f);
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kernel_write_pass_float(buffer+2, value*value);
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}
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#endif /* __DENOISING_FEATURES__ */
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ccl_device_inline void kernel_update_denoising_features(KernelGlobals *kg,
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ShaderData *sd,
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ccl_addr_space PathState *state,
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PathRadiance *L)
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{
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#ifdef __DENOISING_FEATURES__
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if(state->denoising_feature_weight == 0.0f) {
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return;
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}
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L->denoising_depth += ensure_finite(state->denoising_feature_weight * sd->ray_length);
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/* Skip implicitly transparent surfaces. */
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if(sd->flag & SD_HAS_ONLY_VOLUME) {
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return;
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}
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float3 normal = make_float3(0.0f, 0.0f, 0.0f);
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float3 albedo = make_float3(0.0f, 0.0f, 0.0f);
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float sum_weight = 0.0f, sum_nonspecular_weight = 0.0f;
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for(int i = 0; i < sd->num_closure; i++) {
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ShaderClosure *sc = &sd->closure[i];
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if(!CLOSURE_IS_BSDF_OR_BSSRDF(sc->type))
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continue;
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/* All closures contribute to the normal feature, but only diffuse-like ones to the albedo. */
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normal += sc->N * sc->sample_weight;
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sum_weight += sc->sample_weight;
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if(!bsdf_is_specular_like(sc)) {
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albedo += sc->weight;
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sum_nonspecular_weight += sc->sample_weight;
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}
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}
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/* Wait for next bounce if 75% or more sample weight belongs to specular-like closures. */
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if((sum_weight == 0.0f) || (sum_nonspecular_weight*4.0f > sum_weight)) {
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if(sum_weight != 0.0f) {
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normal /= sum_weight;
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}
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L->denoising_normal += ensure_finite3(state->denoising_feature_weight * normal);
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L->denoising_albedo += ensure_finite3(state->denoising_feature_weight * albedo);
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state->denoising_feature_weight = 0.0f;
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}
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#else
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(void) kg;
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(void) sd;
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(void) state;
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(void) L;
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#endif /* __DENOISING_FEATURES__ */
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}
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#ifdef __KERNEL_DEBUG__
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ccl_device_inline void kernel_write_debug_passes(KernelGlobals *kg,
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ccl_global float *buffer,
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PathRadiance *L)
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{
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int flag = kernel_data.film.pass_flag;
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if(flag & PASS_BVH_TRAVERSED_NODES) {
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kernel_write_pass_float(buffer + kernel_data.film.pass_bvh_traversed_nodes,
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L->debug_data.num_bvh_traversed_nodes);
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}
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if(flag & PASS_BVH_TRAVERSED_INSTANCES) {
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kernel_write_pass_float(buffer + kernel_data.film.pass_bvh_traversed_instances,
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L->debug_data.num_bvh_traversed_instances);
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}
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if(flag & PASS_BVH_INTERSECTIONS) {
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kernel_write_pass_float(buffer + kernel_data.film.pass_bvh_intersections,
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L->debug_data.num_bvh_intersections);
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}
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if(flag & PASS_RAY_BOUNCES) {
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kernel_write_pass_float(buffer + kernel_data.film.pass_ray_bounces,
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L->debug_data.num_ray_bounces);
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}
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}
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#endif /* __KERNEL_DEBUG__ */
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ccl_device_inline void kernel_write_data_passes(KernelGlobals *kg, ccl_global float *buffer, PathRadiance *L,
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ShaderData *sd, ccl_addr_space PathState *state, float3 throughput)
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{
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#ifdef __PASSES__
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int path_flag = state->flag;
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if(!(path_flag & PATH_RAY_CAMERA))
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return;
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int flag = kernel_data.film.pass_flag;
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if(!(flag & PASS_ALL))
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return;
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if(!(path_flag & PATH_RAY_SINGLE_PASS_DONE)) {
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if(!(sd->flag & SD_TRANSPARENT) ||
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kernel_data.film.pass_alpha_threshold == 0.0f ||
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average(shader_bsdf_alpha(kg, sd)) >= kernel_data.film.pass_alpha_threshold)
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{
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if(state->sample == 0) {
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if(flag & PASS_DEPTH) {
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float depth = camera_distance(kg, sd->P);
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kernel_write_pass_float(buffer + kernel_data.film.pass_depth, depth);
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}
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if(flag & PASS_OBJECT_ID) {
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float id = object_pass_id(kg, sd->object);
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kernel_write_pass_float(buffer + kernel_data.film.pass_object_id, id);
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}
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if(flag & PASS_MATERIAL_ID) {
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float id = shader_pass_id(kg, sd);
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kernel_write_pass_float(buffer + kernel_data.film.pass_material_id, id);
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}
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}
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if(flag & PASS_NORMAL) {
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float3 normal = shader_bsdf_average_normal(kg, sd);
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kernel_write_pass_float3(buffer + kernel_data.film.pass_normal, normal);
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}
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if(flag & PASS_UV) {
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float3 uv = primitive_uv(kg, sd);
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kernel_write_pass_float3(buffer + kernel_data.film.pass_uv, uv);
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}
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if(flag & PASS_MOTION) {
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float4 speed = primitive_motion_vector(kg, sd);
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kernel_write_pass_float4(buffer + kernel_data.film.pass_motion, speed);
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kernel_write_pass_float(buffer + kernel_data.film.pass_motion_weight, 1.0f);
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}
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state->flag |= PATH_RAY_SINGLE_PASS_DONE;
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}
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}
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if(flag & (PASS_DIFFUSE_INDIRECT|PASS_DIFFUSE_COLOR|PASS_DIFFUSE_DIRECT))
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L->color_diffuse += shader_bsdf_diffuse(kg, sd)*throughput;
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if(flag & (PASS_GLOSSY_INDIRECT|PASS_GLOSSY_COLOR|PASS_GLOSSY_DIRECT))
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L->color_glossy += shader_bsdf_glossy(kg, sd)*throughput;
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if(flag & (PASS_TRANSMISSION_INDIRECT|PASS_TRANSMISSION_COLOR|PASS_TRANSMISSION_DIRECT))
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L->color_transmission += shader_bsdf_transmission(kg, sd)*throughput;
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if(flag & (PASS_SUBSURFACE_INDIRECT|PASS_SUBSURFACE_COLOR|PASS_SUBSURFACE_DIRECT))
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L->color_subsurface += shader_bsdf_subsurface(kg, sd)*throughput;
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if(flag & PASS_MIST) {
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/* bring depth into 0..1 range */
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float mist_start = kernel_data.film.mist_start;
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float mist_inv_depth = kernel_data.film.mist_inv_depth;
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float depth = camera_distance(kg, sd->P);
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float mist = saturate((depth - mist_start)*mist_inv_depth);
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/* falloff */
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float mist_falloff = kernel_data.film.mist_falloff;
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if(mist_falloff == 1.0f)
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;
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else if(mist_falloff == 2.0f)
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mist = mist*mist;
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else if(mist_falloff == 0.5f)
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mist = sqrtf(mist);
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else
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mist = powf(mist, mist_falloff);
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/* modulate by transparency */
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float3 alpha = shader_bsdf_alpha(kg, sd);
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L->mist += (1.0f - mist)*average(throughput*alpha);
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}
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#endif
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}
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ccl_device_inline void kernel_write_light_passes(KernelGlobals *kg, ccl_global float *buffer, PathRadiance *L)
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{
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#ifdef __PASSES__
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int flag = kernel_data.film.pass_flag;
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if(!kernel_data.film.use_light_pass)
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return;
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if(flag & PASS_DIFFUSE_INDIRECT)
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kernel_write_pass_float3(buffer + kernel_data.film.pass_diffuse_indirect, L->indirect_diffuse);
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if(flag & PASS_GLOSSY_INDIRECT)
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kernel_write_pass_float3(buffer + kernel_data.film.pass_glossy_indirect, L->indirect_glossy);
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if(flag & PASS_TRANSMISSION_INDIRECT)
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kernel_write_pass_float3(buffer + kernel_data.film.pass_transmission_indirect, L->indirect_transmission);
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if(flag & PASS_SUBSURFACE_INDIRECT)
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kernel_write_pass_float3(buffer + kernel_data.film.pass_subsurface_indirect, L->indirect_subsurface);
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if(flag & PASS_DIFFUSE_DIRECT)
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kernel_write_pass_float3(buffer + kernel_data.film.pass_diffuse_direct, L->direct_diffuse);
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if(flag & PASS_GLOSSY_DIRECT)
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kernel_write_pass_float3(buffer + kernel_data.film.pass_glossy_direct, L->direct_glossy);
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if(flag & PASS_TRANSMISSION_DIRECT)
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kernel_write_pass_float3(buffer + kernel_data.film.pass_transmission_direct, L->direct_transmission);
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if(flag & PASS_SUBSURFACE_DIRECT)
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kernel_write_pass_float3(buffer + kernel_data.film.pass_subsurface_direct, L->direct_subsurface);
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if(flag & PASS_EMISSION)
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kernel_write_pass_float3(buffer + kernel_data.film.pass_emission, L->emission);
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if(flag & PASS_BACKGROUND)
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kernel_write_pass_float3(buffer + kernel_data.film.pass_background, L->background);
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if(flag & PASS_AO)
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kernel_write_pass_float3(buffer + kernel_data.film.pass_ao, L->ao);
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if(flag & PASS_DIFFUSE_COLOR)
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kernel_write_pass_float3(buffer + kernel_data.film.pass_diffuse_color, L->color_diffuse);
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if(flag & PASS_GLOSSY_COLOR)
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kernel_write_pass_float3(buffer + kernel_data.film.pass_glossy_color, L->color_glossy);
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if(flag & PASS_TRANSMISSION_COLOR)
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kernel_write_pass_float3(buffer + kernel_data.film.pass_transmission_color, L->color_transmission);
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if(flag & PASS_SUBSURFACE_COLOR)
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kernel_write_pass_float3(buffer + kernel_data.film.pass_subsurface_color, L->color_subsurface);
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if(flag & PASS_SHADOW) {
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float4 shadow = L->shadow;
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shadow.w = kernel_data.film.pass_shadow_scale;
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kernel_write_pass_float4(buffer + kernel_data.film.pass_shadow, shadow);
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}
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if(flag & PASS_MIST)
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kernel_write_pass_float(buffer + kernel_data.film.pass_mist, 1.0f - L->mist);
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#endif
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}
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ccl_device_inline void kernel_write_result(KernelGlobals *kg, ccl_global float *buffer,
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int sample, PathRadiance *L)
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{
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float alpha;
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float3 L_sum = path_radiance_clamp_and_sum(kg, L, &alpha);
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kernel_write_pass_float4(buffer, make_float4(L_sum.x, L_sum.y, L_sum.z, alpha));
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kernel_write_light_passes(kg, buffer, L);
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#ifdef __DENOISING_FEATURES__
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if(kernel_data.film.pass_denoising_data) {
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# ifdef __SHADOW_TRICKS__
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kernel_write_denoising_shadow(kg, buffer + kernel_data.film.pass_denoising_data, sample, average(L->path_total), average(L->path_total_shaded));
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# else
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kernel_write_denoising_shadow(kg, buffer + kernel_data.film.pass_denoising_data, sample, 0.0f, 0.0f);
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# endif
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if(kernel_data.film.pass_denoising_clean) {
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float3 noisy, clean;
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path_radiance_split_denoising(kg, L, &noisy, &clean);
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kernel_write_pass_float3_variance(buffer + kernel_data.film.pass_denoising_data + DENOISING_PASS_COLOR,
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noisy);
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kernel_write_pass_float3_unaligned(buffer + kernel_data.film.pass_denoising_clean,
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clean);
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}
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else {
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kernel_write_pass_float3_variance(buffer + kernel_data.film.pass_denoising_data + DENOISING_PASS_COLOR,
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ensure_finite3(L_sum));
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}
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kernel_write_pass_float3_variance(buffer + kernel_data.film.pass_denoising_data + DENOISING_PASS_NORMAL,
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L->denoising_normal);
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kernel_write_pass_float3_variance(buffer + kernel_data.film.pass_denoising_data + DENOISING_PASS_ALBEDO,
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L->denoising_albedo);
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kernel_write_pass_float_variance(buffer + kernel_data.film.pass_denoising_data + DENOISING_PASS_DEPTH,
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L->denoising_depth);
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}
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#endif /* __DENOISING_FEATURES__ */
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#ifdef __KERNEL_DEBUG__
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kernel_write_debug_passes(kg, buffer, L);
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#endif
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}
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CCL_NAMESPACE_END
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