forked from bartvdbraak/blender
83e73a2100
This commit changes the way how we pass bounce information to the Light Path node. Instead of manualy copying the bounces into ShaderData, we now directly pass PathState. This reduces the arguments that we need to pass around and also makes it easier to extend the feature. This commit also exposes the Transmission Bounce Depth to the Light Path node. It works similar to the Transparent Depth Output: Replace a Transmission lightpath after X bounces with another shader, e.g a Diffuse one. This can be used to avoid black surfaces, due to low amount of max bounces. Reviewed by Sergey and Brecht, thanks for some hlp with this. I tested compilation and usage on CPU (SVM and OSL), CUDA, OpenCL Split and Mega kernel. Hopefully this covers all devices. :)
71 lines
3.5 KiB
C
71 lines
3.5 KiB
C
/*
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* Copyright 2011-2015 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 "kernel_split_common.h"
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/* Note on kernel_shader_eval kernel
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* This kernel is the 5th kernel in the ray tracing logic. This is
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* the 4rd kernel in path iteration. This kernel sets up the ShaderData
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* structure from the values computed by the previous kernels. It also identifies
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* the rays of state RAY_TO_REGENERATE and enqueues them in QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS queue.
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*
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* The input and output of the kernel is as follows,
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* rng_coop -------------------------------------------|--- kernel_shader_eval --|--- sd
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* Ray_coop -------------------------------------------| |--- Queue_data (QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS)
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* PathState_coop -------------------------------------| |--- Queue_index (QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS)
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* Intersection_coop ----------------------------------| |
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* Queue_data (QUEUE_ACTIVE_AND_REGENERATD_RAYS)-------| |
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* Queue_index(QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS)---| |
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* ray_state ------------------------------------------| |
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* kg (globals) ---------------------------------------| |
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* queuesize ------------------------------------------| |
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*
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* Note on Queues :
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* This kernel reads from the QUEUE_ACTIVE_AND_REGENERATED_RAYS queue and processes
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* only the rays of state RAY_ACTIVE;
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* State of queues when this kernel is called,
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* at entry,
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* QUEUE_ACTIVE_AND_REGENERATED_RAYS will be filled with RAY_ACTIVE and RAY_REGENERATED rays
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* QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS will be empty.
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* at exit,
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* QUEUE_ACTIVE_AND_REGENERATED_RAYS will be filled with RAY_ACTIVE and RAY_REGENERATED rays
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* QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS will be filled with RAY_TO_REGENERATE rays
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*/
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ccl_device void kernel_shader_eval(
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KernelGlobals *kg,
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ShaderData *sd, /* Output ShaderData structure to be filled */
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ccl_global uint *rng_coop, /* Required for rbsdf calculation */
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ccl_global Ray *Ray_coop, /* Required for setting up shader from ray */
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ccl_global PathState *PathState_coop, /* Required for all functions in this kernel */
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Intersection *Intersection_coop, /* Required for setting up shader from ray */
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ccl_global char *ray_state, /* Denotes the state of each ray */
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int ray_index)
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{
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if(IS_STATE(ray_state, ray_index, RAY_ACTIVE)) {
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Intersection *isect = &Intersection_coop[ray_index];
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ccl_global uint *rng = &rng_coop[ray_index];
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ccl_global PathState *state = &PathState_coop[ray_index];
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Ray ray = Ray_coop[ray_index];
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shader_setup_from_ray(kg,
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sd,
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isect,
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&ray);
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float rbsdf = path_state_rng_1D_for_decision(kg, rng, state, PRNG_BSDF);
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shader_eval_surface(kg, sd, state, rbsdf, state->flag, SHADER_CONTEXT_MAIN);
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}
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}
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