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 * Remove specific license info from outdated readme.txt, instead leave details to the source files.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
62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/* SPDX-License-Identifier: Apache-2.0
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* Licensed under the Apache License, Version 2.0 (the "License"); */
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CCL_NAMESPACE_BEGIN
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/* Motion Point Primitive
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*
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* These are stored as regular points, plus extra positions and radii at times
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* other than the frame center. Computing the point at a given ray time is
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* a matter of interpolation of the two steps between which the ray time lies.
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*
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* The extra points are stored as ATTR_STD_MOTION_VERTEX_POSITION.
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*/
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#ifdef __POINTCLOUD__
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ccl_device_inline float4
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motion_point_for_step(KernelGlobals kg, int offset, int numkeys, int numsteps, int step, int prim)
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{
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if (step == numsteps) {
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/* center step: regular key location */
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return kernel_tex_fetch(__points, prim);
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}
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else {
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/* center step is not stored in this array */
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if (step > numsteps)
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step--;
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offset += step * numkeys;
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return kernel_tex_fetch(__attributes_float4, offset + prim);
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}
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}
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/* return 2 point key locations */
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ccl_device_inline float4 motion_point(KernelGlobals kg, int object, int prim, float time)
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{
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/* get motion info */
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int numsteps, numkeys;
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object_motion_info(kg, object, &numsteps, NULL, &numkeys);
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/* figure out which steps we need to fetch and their interpolation factor */
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int maxstep = numsteps * 2;
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int step = min((int)(time * maxstep), maxstep - 1);
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float t = time * maxstep - step;
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/* find attribute */
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int offset = intersection_find_attribute(kg, object, ATTR_STD_MOTION_VERTEX_POSITION);
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kernel_assert(offset != ATTR_STD_NOT_FOUND);
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/* fetch key coordinates */
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float4 point = motion_point_for_step(kg, offset, numkeys, numsteps, step, prim);
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float4 next_point = motion_point_for_step(kg, offset, numkeys, numsteps, step + 1, prim);
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/* interpolate between steps */
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return (1.0f - t) * point + t * next_point;
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}
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#endif
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CCL_NAMESPACE_END
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