forked from bartvdbraak/blender
Brecht Van Lommel
b66efbecf4
This save a little memory and copying in the kernel by storing only a 4x3 matrix instead of a 4x4 matrix. We already did this in a few places, and those don't need to be special exceptions anymore now.
112 lines
3.2 KiB
C
112 lines
3.2 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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/* Attributes
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*
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* We support an arbitrary number of attributes on various mesh elements.
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* On vertices, triangles, curve keys, curves, meshes and volume grids.
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* Most of the code for attribute reading is in the primitive files.
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*
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* Lookup of attributes is different between OSL and SVM, as OSL is ustring
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* based while for SVM we use integer ids. */
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ccl_device_inline uint subd_triangle_patch(KernelGlobals *kg, const ShaderData *sd);
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ccl_device_inline uint attribute_primitive_type(KernelGlobals *kg, const ShaderData *sd)
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{
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#ifdef __HAIR__
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if(sd->type & PRIMITIVE_ALL_CURVE) {
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return ATTR_PRIM_CURVE;
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}
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else
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#endif
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if(subd_triangle_patch(kg, sd) != ~0) {
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return ATTR_PRIM_SUBD;
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}
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else {
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return ATTR_PRIM_TRIANGLE;
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}
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}
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ccl_device_inline AttributeDescriptor attribute_not_found()
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{
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const AttributeDescriptor desc = {ATTR_ELEMENT_NONE, (NodeAttributeType)0, 0, ATTR_STD_NOT_FOUND};
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return desc;
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}
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/* Find attribute based on ID */
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ccl_device_inline uint object_attribute_map_offset(KernelGlobals *kg, int object)
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{
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return kernel_tex_fetch(__objects, object).attribute_map_offset;
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}
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ccl_device_inline AttributeDescriptor find_attribute(KernelGlobals *kg, const ShaderData *sd, uint id)
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{
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if(sd->object == OBJECT_NONE) {
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return attribute_not_found();
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}
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/* for SVM, find attribute by unique id */
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uint attr_offset = object_attribute_map_offset(kg, sd->object);
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attr_offset += attribute_primitive_type(kg, sd);
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uint4 attr_map = kernel_tex_fetch(__attributes_map, attr_offset);
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while(attr_map.x != id) {
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if(UNLIKELY(attr_map.x == ATTR_STD_NONE)) {
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return attribute_not_found();
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}
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attr_offset += ATTR_PRIM_TYPES;
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attr_map = kernel_tex_fetch(__attributes_map, attr_offset);
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}
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AttributeDescriptor desc;
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desc.element = (AttributeElement)attr_map.y;
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if(sd->prim == PRIM_NONE &&
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desc.element != ATTR_ELEMENT_MESH &&
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desc.element != ATTR_ELEMENT_VOXEL &&
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desc.element != ATTR_ELEMENT_OBJECT)
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{
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return attribute_not_found();
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}
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/* return result */
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desc.offset = (attr_map.y == ATTR_ELEMENT_NONE) ? (int)ATTR_STD_NOT_FOUND : (int)attr_map.z;
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desc.type = (NodeAttributeType)(attr_map.w & 0xff);
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desc.flags = (AttributeFlag)(attr_map.w >> 8);
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return desc;
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}
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/* Transform matrix attribute on meshes */
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ccl_device Transform primitive_attribute_matrix(KernelGlobals *kg, const ShaderData *sd, const AttributeDescriptor desc)
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{
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Transform tfm;
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tfm.x = kernel_tex_fetch(__attributes_float3, desc.offset + 0);
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tfm.y = kernel_tex_fetch(__attributes_float3, desc.offset + 1);
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tfm.z = kernel_tex_fetch(__attributes_float3, desc.offset + 2);
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return tfm;
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}
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CCL_NAMESPACE_END
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