forked from bartvdbraak/blender
7f4479da42
This commit contains all the work related on the AMD megakernel split work which was mainly done by Varun Sundar, George Kyriazis and Lenny Wang, plus some help from Sergey Sharybin, Martijn Berger, Thomas Dinges and likely someone else which we're forgetting to mention. Currently only AMD cards are enabled for the new split kernel, but it is possible to force split opencl kernel to be used by setting the following environment variable: CYCLES_OPENCL_SPLIT_KERNEL_TEST=1. Not all the features are supported yet, and that being said no motion blur, camera blur, SSS and volumetrics for now. Also transparent shadows are disabled on AMD device because of some compiler bug. This kernel is also only implements regular path tracing and supporting branched one will take a bit. Branched path tracing is exposed to the interface still, which is a bit misleading and will be hidden there soon. More feature will be enabled once they're ported to the split kernel and tested. Neither regular CPU nor CUDA has any difference, they're generating the same exact code, which means no regressions/improvements there. Based on the research paper: https://research.nvidia.com/sites/default/files/publications/laine2013hpg_paper.pdf Here's the documentation: https://docs.google.com/document/d/1LuXW-CV-sVJkQaEGZlMJ86jZ8FmoPfecaMdR-oiWbUY/edit Design discussion of the patch: https://developer.blender.org/T44197 Differential Revision: https://developer.blender.org/D1200
73 lines
2.3 KiB
C
73 lines
2.3 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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/* Bump Node */
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ccl_device void svm_node_set_bump(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node)
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{
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#ifdef __RAY_DIFFERENTIALS__
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/* get normal input */
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uint normal_offset, distance_offset, invert;
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decode_node_uchar4(node.y, &normal_offset, &distance_offset, &invert, NULL);
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float3 normal_in = stack_valid(normal_offset)? stack_load_float3(stack, normal_offset): ccl_fetch(sd, N);
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/* get surface tangents from normal */
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float3 Rx = cross(ccl_fetch(sd, dP).dy, normal_in);
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float3 Ry = cross(normal_in, ccl_fetch(sd, dP).dx);
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/* get bump values */
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uint c_offset, x_offset, y_offset, strength_offset;
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decode_node_uchar4(node.z, &c_offset, &x_offset, &y_offset, &strength_offset);
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float h_c = stack_load_float(stack, c_offset);
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float h_x = stack_load_float(stack, x_offset);
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float h_y = stack_load_float(stack, y_offset);
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/* compute surface gradient and determinant */
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float det = dot(ccl_fetch(sd, dP).dx, Rx);
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float3 surfgrad = (h_x - h_c)*Rx + (h_y - h_c)*Ry;
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float absdet = fabsf(det);
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float strength = stack_load_float(stack, strength_offset);
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float distance = stack_load_float(stack, distance_offset);
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if(invert)
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distance *= -1.0f;
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strength = max(strength, 0.0f);
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/* compute and output perturbed normal */
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float3 normal_out = normalize(absdet*normal_in - distance*signf(det)*surfgrad);
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normal_out = normalize(strength*normal_out + (1.0f - strength)*normal_in);
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stack_store_float3(stack, node.w, normal_out);
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#endif
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}
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/* Displacement Node */
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ccl_device void svm_node_set_displacement(ShaderData *sd, float *stack, uint fac_offset)
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{
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float d = stack_load_float(stack, fac_offset);
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ccl_fetch(sd, P) += ccl_fetch(sd, N)*d*0.1f; /* todo: get rid of this factor */
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}
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CCL_NAMESPACE_END
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