66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
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*
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* SPDX-License-Identifier: Apache-2.0 */
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#pragma once
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#include "kernel/closure/bsdf_util.h"
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#include "kernel/svm/node_types.h"
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#include "kernel/svm/util.h"
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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 *ccl_restrict stack,
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const ccl_global SVMNodeFresnel &ccl_restrict node)
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{
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float eta = stack_load(stack, node.ior);
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const float3 normal_in = stack_load_float3_default(stack, node.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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const float f = fresnel_dielectric_cos(dot(sd->wi, normal_in), eta);
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stack_store_float(stack, node.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 *ccl_restrict stack,
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const ccl_global SVMNodeLayerWeight &ccl_restrict
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node)
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{
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float blend = stack_load(stack, node.blend);
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const float3 normal_in = stack_load_float3_default(stack, node.normal_offset, sd->N);
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float f;
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if (node.weight_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->wi, normal_in), eta);
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}
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else {
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f = fabsf(dot(sd->wi, 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, node.out_offset, f);
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}
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CCL_NAMESPACE_END
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