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/*
* Copyright 2011-2013 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* Motion Triangle Primitive
*
* These are stored as regular triangles, plus extra positions and normals at
* times other than the frame center. Computing the triangle vertex positions
* or normals at a given ray time is a matter of interpolation of the two steps
* between which the ray time lies.
*
* The extra positions and normals are stored as ATTR_STD_MOTION_VERTEX_POSITION
* and ATTR_STD_MOTION_VERTEX_NORMAL mesh attributes.
*/
CCL_NAMESPACE_BEGIN
/* Time interpolation of vertex positions and normals */
ccl_device_inline int find_attribute_motion(KernelGlobals *kg, int object, uint id, AttributeElement *elem)
{
/* todo: find a better (faster) solution for this, maybe store offset per object */
uint attr_offset = object*kernel_data.bvh.attributes_map_stride;
uint4 attr_map = kernel_tex_fetch(__attributes_map, attr_offset);
while(attr_map.x != id) {
attr_offset += ATTR_PRIM_TYPES;
attr_map = kernel_tex_fetch(__attributes_map, attr_offset);
}
*elem = (AttributeElement)attr_map.y;
/* return result */
return (attr_map.y == ATTR_ELEMENT_NONE) ? (int)ATTR_STD_NOT_FOUND : (int)attr_map.z;
}
ccl_device_inline void motion_triangle_verts_for_step(KernelGlobals *kg, uint4 tri_vindex, int offset, int numverts, int numsteps, int step, float3 verts[3])
{
if(step == numsteps) {
/* center step: regular vertex location */
verts[0] = float4_to_float3(kernel_tex_fetch(__prim_tri_verts, tri_vindex.w+0));
verts[1] = float4_to_float3(kernel_tex_fetch(__prim_tri_verts, tri_vindex.w+1));
verts[2] = float4_to_float3(kernel_tex_fetch(__prim_tri_verts, tri_vindex.w+2));
}
else {
/* center step not store in this array */
if(step > numsteps)
step--;
offset += step*numverts;
verts[0] = float4_to_float3(kernel_tex_fetch(__attributes_float3, offset + tri_vindex.x));
verts[1] = float4_to_float3(kernel_tex_fetch(__attributes_float3, offset + tri_vindex.y));
verts[2] = float4_to_float3(kernel_tex_fetch(__attributes_float3, offset + tri_vindex.z));
}
}
ccl_device_inline void motion_triangle_normals_for_step(KernelGlobals *kg, uint4 tri_vindex, int offset, int numverts, int numsteps, int step, float3 normals[3])
{
if(step == numsteps) {
/* center step: regular vertex location */
normals[0] = float4_to_float3(kernel_tex_fetch(__tri_vnormal, tri_vindex.x));
normals[1] = float4_to_float3(kernel_tex_fetch(__tri_vnormal, tri_vindex.y));
normals[2] = float4_to_float3(kernel_tex_fetch(__tri_vnormal, tri_vindex.z));
}
else {
/* center step is not stored in this array */
if(step > numsteps)
step--;
offset += step*numverts;
normals[0] = float4_to_float3(kernel_tex_fetch(__attributes_float3, offset + tri_vindex.x));
normals[1] = float4_to_float3(kernel_tex_fetch(__attributes_float3, offset + tri_vindex.y));
normals[2] = float4_to_float3(kernel_tex_fetch(__attributes_float3, offset + tri_vindex.z));
}
}
ccl_device_inline void motion_triangle_vertices(KernelGlobals *kg, int object, int prim, float time, float3 verts[3])
{
/* get motion info */
int numsteps, numverts;
object_motion_info(kg, object, &numsteps, &numverts, NULL);
/* figure out which steps we need to fetch and their interpolation factor */
int maxstep = numsteps*2;
int step = min((int)(time*maxstep), maxstep-1);
float t = time*maxstep - step;
/* find attribute */
AttributeElement elem;
int offset = find_attribute_motion(kg, object, ATTR_STD_MOTION_VERTEX_POSITION, &elem);
kernel_assert(offset != ATTR_STD_NOT_FOUND);
/* fetch vertex coordinates */
float3 next_verts[3];
uint4 tri_vindex = kernel_tex_fetch(__tri_vindex, prim);
motion_triangle_verts_for_step(kg, tri_vindex, offset, numverts, numsteps, step, verts);
motion_triangle_verts_for_step(kg, tri_vindex, offset, numverts, numsteps, step+1, next_verts);
/* interpolate between steps */
verts[0] = (1.0f - t)*verts[0] + t*next_verts[0];
verts[1] = (1.0f - t)*verts[1] + t*next_verts[1];
verts[2] = (1.0f - t)*verts[2] + t*next_verts[2];
}
CCL_NAMESPACE_END
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