64 lines
2.0 KiB
C
64 lines
2.0 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/globals.h"
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#include "kernel/geom/attribute.h"
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#include "kernel/geom/object.h"
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#include "kernel/geom/primitive.h"
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#include "kernel/svm/node_types.h"
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#include "kernel/svm/util.h"
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#include "kernel/util/differential.h"
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CCL_NAMESPACE_BEGIN
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/* Bump Eval Nodes */
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ccl_device_noinline void svm_node_enter_bump_eval(KernelGlobals kg,
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ccl_private ShaderData *sd,
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ccl_private float *stack,
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const ccl_global SVMNodeEnterBumpEval &node)
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{
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const uint offset = node.state_offset;
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/* save state */
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stack_store_float3(stack, offset + 0, sd->P);
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stack_store_float(stack, offset + 3, sd->dP);
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/* Set position as if undisplaced. */
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const AttributeDescriptor desc = find_attribute(kg, sd, ATTR_STD_POSITION_UNDISPLACED);
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if (is_attribute_found(desc)) {
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dual3 attr = primitive_surface_attribute<dual3>(kg, sd, desc);
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object_position_transform(kg, sd, &attr);
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sd->P = attr.val;
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sd->dP = differential_make_compact(attr);
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/* Save the full differential, the compact form isn't enough for svm_node_set_bump. */
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stack_store_float3(stack, offset + 4, attr.dx);
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stack_store_float3(stack, offset + 7, attr.dy);
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/* Set normal as if undisplaced. Note this does not need to be restored,
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* because the bump evaluation will write to sd->N. */
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primitive_normal_set_undisplaced(kg, sd, desc.offset);
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}
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}
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ccl_device_noinline void svm_node_leave_bump_eval(ccl_private ShaderData *sd,
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ccl_private float *stack,
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const ccl_global SVMNodeLeaveBumpEval &node)
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{
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const uint offset = node.state_offset;
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/* restore state */
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sd->P = stack_load_float3(stack, offset + 0);
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sd->dP = stack_load_float(stack, offset + 3);
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}
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CCL_NAMESPACE_END
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