84ad20acef
This commit re-shuffles code in split kernel once again and makes it so common parts which is in the headers is only responsible to making all the work needed for specified ray index. Getting ray index, checking for it's validity and enqueuing tasks are now happening in the device specified part of the kernel. This actually makes sense because enqueuing is indeed device-specified and i.e. with CUDA we'll want to enqueue kernels from kernel and avoid CPU roundtrip. TODO: - Kernel comments are still placed in the common header files, but since queue related stuff is not passed to those functions those comments might need to be split as well. Just currently read them considering that they're also covering the way how all devices are invoking the common code path. - Arguments might need to be wrapped into KernelGlobals, so we don't ened to pass all them around as function arguments.
106 lines
5.0 KiB
C
106 lines
5.0 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 && (ccl_fetch(sd, flag) & SD_BSDF_HAS_EVAL))) {
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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, light_t, light_u, light_v, ccl_fetch(sd, time), ccl_fetch(sd, P), state->bounce, &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, state->bounce, state->transparent_bounce, sd_DL)) {
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/* write intermediate data to global memory to access from the next kernel */
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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
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}
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return enqueue_flag;
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}
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