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. :)
73 lines
2.7 KiB
C
73 lines
2.7 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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/* Light Path Node */
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ccl_device void svm_node_light_path(ShaderData *sd, ccl_addr_space PathState *state, float *stack, uint type, uint out_offset, int path_flag)
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{
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float info = 0.0f;
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switch(type) {
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case NODE_LP_camera: info = (path_flag & PATH_RAY_CAMERA)? 1.0f: 0.0f; break;
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case NODE_LP_shadow: info = (path_flag & PATH_RAY_SHADOW)? 1.0f: 0.0f; break;
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case NODE_LP_diffuse: info = (path_flag & PATH_RAY_DIFFUSE)? 1.0f: 0.0f; break;
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case NODE_LP_glossy: info = (path_flag & PATH_RAY_GLOSSY)? 1.0f: 0.0f; break;
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case NODE_LP_singular: info = (path_flag & PATH_RAY_SINGULAR)? 1.0f: 0.0f; break;
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case NODE_LP_reflection: info = (path_flag & PATH_RAY_REFLECT)? 1.0f: 0.0f; break;
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case NODE_LP_transmission: info = (path_flag & PATH_RAY_TRANSMIT)? 1.0f: 0.0f; break;
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case NODE_LP_volume_scatter: info = (path_flag & PATH_RAY_VOLUME_SCATTER)? 1.0f: 0.0f; break;
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case NODE_LP_backfacing: info = (ccl_fetch(sd, flag) & SD_BACKFACING)? 1.0f: 0.0f; break;
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case NODE_LP_ray_length: info = ccl_fetch(sd, ray_length); break;
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case NODE_LP_ray_depth: info = (float)state->bounce; break;
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case NODE_LP_ray_transparent: info = (float)state->transparent_bounce; break;
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case NODE_LP_ray_transmission: info = (float)state->transmission_bounce; break;
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}
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stack_store_float(stack, out_offset, info);
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}
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/* Light Falloff Node */
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ccl_device void svm_node_light_falloff(ShaderData *sd, float *stack, uint4 node)
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{
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uint strength_offset, out_offset, smooth_offset;
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decode_node_uchar4(node.z, &strength_offset, &smooth_offset, &out_offset, NULL);
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float strength = stack_load_float(stack, strength_offset);
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uint type = node.y;
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switch(type) {
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case NODE_LIGHT_FALLOFF_QUADRATIC: break;
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case NODE_LIGHT_FALLOFF_LINEAR: strength *= ccl_fetch(sd, ray_length); break;
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case NODE_LIGHT_FALLOFF_CONSTANT: strength *= ccl_fetch(sd, ray_length)*ccl_fetch(sd, ray_length); break;
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}
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float smooth = stack_load_float(stack, smooth_offset);
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if(smooth > 0.0f) {
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float squared = ccl_fetch(sd, ray_length)*ccl_fetch(sd, ray_length);
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strength *= squared/(smooth + squared);
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}
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stack_store_float(stack, out_offset, strength);
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}
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CCL_NAMESPACE_END
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