forked from bartvdbraak/blender
117 lines
5.1 KiB
C
117 lines
5.1 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_direct_lighting kernel.
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* This is the eighth kernel in the ray tracing logic. This is the seventh
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* of the path iteration kernels. This kernel takes care of direct lighting
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* logic. However, the "shadow ray cast" part of direct lighting is handled
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* in the next kernel.
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*
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* This kernels determines the rays for which a shadow_blocked() function associated with direct lighting should be executed.
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* Those rays for which a shadow_blocked() function for direct-lighting must be executed, are marked with flag RAY_SHADOW_RAY_CAST_DL and
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* enqueued into the queue QUEUE_SHADOW_RAY_CAST_DL_RAYS
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*
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* The input and output are as follows,
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*
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* rng_coop -----------------------------------------|--- kernel_direct_lighting --|--- BSDFEval_coop
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* PathState_coop -----------------------------------| |--- ISLamp_coop
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* shader_data --------------------------------------| |--- LightRay_coop
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* ray_state ----------------------------------------| |--- ray_state
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* Queue_data (QUEUE_ACTIVE_AND_REGENERATED_RAYS) ---| |
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* kg (globals + data) ------------------------------| |
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* queuesize ----------------------------------------| |
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*
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* note on shader_DL : shader_DL is neither input nor output to this kernel; shader_DL is filled and consumed in this kernel itself.
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* Note on Queues :
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* This kernel only reads from the QUEUE_ACTIVE_AND_REGENERATED_RAYS queue and processes
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* only the rays of state RAY_ACTIVE; If a ray needs to execute the corresponding shadow_blocked
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* part, after direct lighting, the ray is marked with RAY_SHADOW_RAY_CAST_DL flag.
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*
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* State of queues when this kernel is called :
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* state of queues QUEUE_ACTIVE_AND_REGENERATED_RAYS and QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS will be same
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* before and after this kernel call.
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* QUEUE_SHADOW_RAY_CAST_DL_RAYS queue will be filled with rays for which a shadow_blocked function must be executed, after this
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* kernel call. Before this kernel call the QUEUE_SHADOW_RAY_CAST_DL_RAYS will be empty.
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*/
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ccl_device char kernel_direct_lighting(
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ccl_global char *globals,
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ccl_constant KernelData *data,
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ccl_global char *shader_data, /* Required for direct lighting */
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ccl_global char *shader_DL, /* Required for direct lighting */
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ccl_global uint *rng_coop, /* Required for direct lighting */
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ccl_global PathState *PathState_coop, /* Required for direct lighting */
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ccl_global int *ISLamp_coop, /* Required for direct lighting */
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ccl_global Ray *LightRay_coop, /* Required for direct lighting */
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ccl_global BsdfEval *BSDFEval_coop, /* Required for direct lighting */
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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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char enqueue_flag = 0;
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if(IS_STATE(ray_state, ray_index, RAY_ACTIVE)) {
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/* Load kernel globals structure and ShaderData structure. */
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KernelGlobals *kg = (KernelGlobals *)globals;
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ShaderData *sd = (ShaderData *)shader_data;
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ShaderData *sd_DL = (ShaderData *)shader_DL;
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ccl_global PathState *state = &PathState_coop[ray_index];
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/* direct lighting */
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#ifdef __EMISSION__
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if((kernel_data.integrator.use_direct_light &&
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(ccl_fetch(sd, flag) & SD_BSDF_HAS_EVAL)))
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{
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/* Sample illumination from lights to find path contribution. */
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ccl_global RNG* rng = &rng_coop[ray_index];
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float light_t = path_state_rng_1D(kg, rng, state, PRNG_LIGHT);
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float light_u, light_v;
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path_state_rng_2D(kg, rng, state, PRNG_LIGHT_U, &light_u, &light_v);
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LightSample ls;
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light_sample(kg,
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light_t, light_u, light_v,
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ccl_fetch(sd, time),
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ccl_fetch(sd, P),
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state->bounce,
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&ls);
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Ray light_ray;
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#ifdef __OBJECT_MOTION__
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light_ray.time = ccl_fetch(sd, time);
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#endif
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BsdfEval L_light;
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bool is_lamp;
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if(direct_emission(kg, sd, &ls, &light_ray, &L_light, &is_lamp,
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state->bounce, state->transparent_bounce, sd_DL))
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{
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/* Write intermediate data to global memory to access from
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* the next kernel.
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*/
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LightRay_coop[ray_index] = light_ray;
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BSDFEval_coop[ray_index] = L_light;
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ISLamp_coop[ray_index] = is_lamp;
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/* Mark ray state for next shadow kernel. */
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ADD_RAY_FLAG(ray_state, ray_index, RAY_SHADOW_RAY_CAST_DL);
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enqueue_flag = 1;
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}
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}
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#endif /* __EMISSION__ */
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}
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return enqueue_flag;
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}
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