9cfc7967dd
* Replace license text in headers with SPDX identifiers. * Remove specific license info from outdated readme.txt, instead leave details to the source files. * Add list of SPDX license identifiers used, and corresponding license texts. * Update copyright dates while we're at it. Ref D14069, T95597
72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
/* SPDX-License-Identifier: Apache-2.0
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* Copyright 2011-2022 Blender Foundation */
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#pragma once
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CCL_NAMESPACE_BEGIN
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/* Fresnel Node */
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ccl_device_noinline void svm_node_fresnel(ccl_private ShaderData *sd,
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ccl_private float *stack,
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uint ior_offset,
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uint ior_value,
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uint node)
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{
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uint normal_offset, out_offset;
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svm_unpack_node_uchar2(node, &normal_offset, &out_offset);
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float eta = (stack_valid(ior_offset)) ? stack_load_float(stack, ior_offset) :
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__uint_as_float(ior_value);
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float3 normal_in = stack_valid(normal_offset) ? stack_load_float3(stack, normal_offset) : sd->N;
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eta = fmaxf(eta, 1e-5f);
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eta = (sd->flag & SD_BACKFACING) ? 1.0f / eta : eta;
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float f = fresnel_dielectric_cos(dot(sd->I, normal_in), eta);
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stack_store_float(stack, out_offset, f);
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}
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/* Layer Weight Node */
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ccl_device_noinline void svm_node_layer_weight(ccl_private ShaderData *sd,
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ccl_private float *stack,
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uint4 node)
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{
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uint blend_offset = node.y;
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uint blend_value = node.z;
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uint type, normal_offset, out_offset;
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svm_unpack_node_uchar3(node.w, &type, &normal_offset, &out_offset);
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float blend = (stack_valid(blend_offset)) ? stack_load_float(stack, blend_offset) :
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__uint_as_float(blend_value);
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float3 normal_in = (stack_valid(normal_offset)) ? stack_load_float3(stack, normal_offset) :
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sd->N;
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float f;
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if (type == NODE_LAYER_WEIGHT_FRESNEL) {
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float eta = fmaxf(1.0f - blend, 1e-5f);
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eta = (sd->flag & SD_BACKFACING) ? eta : 1.0f / eta;
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f = fresnel_dielectric_cos(dot(sd->I, normal_in), eta);
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}
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else {
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f = fabsf(dot(sd->I, normal_in));
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if (blend != 0.5f) {
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blend = clamp(blend, 0.0f, 1.0f - 1e-5f);
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blend = (blend < 0.5f) ? 2.0f * blend : 0.5f / (1.0f - blend);
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f = powf(f, blend);
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}
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f = 1.0f - f;
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}
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stack_store_float(stack, out_offset, f);
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}
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CCL_NAMESPACE_END
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