forked from bartvdbraak/blender
e7ea1ae78c
Object coordinates can now be used in the displacement shader and will give correct results, where as before bump mapping was calculated from the displace positions and resulted in incorrect shading. This works by evaluating the shader in two parts, first bump then surface, and setting the shader state to match what it would be if the surface was undisplaced for the bump shader evaluation. Currently only `P` is set as if undisplaced, but other shader variables could be set as well, such as `I` or `time`. Since these aren't set to anything meaningful for displacement I left them out of this patch, we can decide what to do with them separately. Reviewed By: brecht Differential Revision: https://developer.blender.org/D2156
55 lines
1.7 KiB
C
55 lines
1.7 KiB
C
/*
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* Copyright 2011-2016 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 Eval Nodes */
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ccl_device void svm_node_enter_bump_eval(KernelGlobals *kg, ShaderData *sd, float *stack, uint offset)
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{
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/* save state */
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stack_store_float3(stack, offset+0, ccl_fetch(sd, P));
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stack_store_float3(stack, offset+3, ccl_fetch(sd, dP).dx);
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stack_store_float3(stack, offset+6, ccl_fetch(sd, dP).dy);
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/* set state as if undisplaced */
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const AttributeDescriptor desc = find_attribute(kg, sd, ATTR_STD_POSITION_UNDISPLACED);
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if(desc.offset != ATTR_STD_NOT_FOUND) {
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float3 P, dPdx, dPdy;
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P = primitive_attribute_float3(kg, sd, desc, &dPdx, &dPdy);
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object_position_transform(kg, sd, &P);
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object_dir_transform(kg, sd, &dPdx);
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object_dir_transform(kg, sd, &dPdy);
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ccl_fetch(sd, P) = P;
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ccl_fetch(sd, dP).dx = dPdx;
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ccl_fetch(sd, dP).dy = dPdy;
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}
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}
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ccl_device void svm_node_leave_bump_eval(KernelGlobals *kg, ShaderData *sd, float *stack, uint offset)
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{
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/* restore state */
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ccl_fetch(sd, P) = stack_load_float3(stack, offset+0);
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ccl_fetch(sd, dP).dx = stack_load_float3(stack, offset+3);
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ccl_fetch(sd, dP).dy = stack_load_float3(stack, offset+6);
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}
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CCL_NAMESPACE_END
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