156 lines
5.7 KiB
C
156 lines
5.7 KiB
C
/*
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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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#pragma once
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CCL_NAMESPACE_BEGIN
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/* Motion Curve Primitive
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*
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* These are stored as regular curves, plus extra positions and radii at times
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* other than the frame center. Computing the curve keys 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 curve keys are stored as ATTR_STD_MOTION_VERTEX_POSITION.
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*/
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#ifdef __HAIR__
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ccl_device_inline void motion_curve_keys_for_step_linear(KernelGlobals kg,
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int offset,
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int numkeys,
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int numsteps,
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int step,
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int k0,
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int k1,
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float4 keys[2])
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{
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if (step == numsteps) {
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/* center step: regular key location */
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keys[0] = kernel_tex_fetch(__curve_keys, k0);
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keys[1] = kernel_tex_fetch(__curve_keys, k1);
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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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keys[0] = kernel_tex_fetch(__attributes_float4, offset + k0);
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keys[1] = kernel_tex_fetch(__attributes_float4, offset + k1);
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}
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}
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/* return 2 curve key locations */
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ccl_device_inline void motion_curve_keys_linear(
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KernelGlobals kg, int object, int prim, float time, int k0, int k1, float4 keys[2])
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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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const int maxstep = numsteps * 2;
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const int step = min((int)(time * maxstep), maxstep - 1);
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const float t = time * maxstep - step;
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/* find attribute */
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const 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 next_keys[2];
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motion_curve_keys_for_step_linear(kg, offset, numkeys, numsteps, step, k0, k1, keys);
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motion_curve_keys_for_step_linear(kg, offset, numkeys, numsteps, step + 1, k0, k1, next_keys);
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/* interpolate between steps */
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keys[0] = (1.0f - t) * keys[0] + t * next_keys[0];
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keys[1] = (1.0f - t) * keys[1] + t * next_keys[1];
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}
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ccl_device_inline void motion_curve_keys_for_step(KernelGlobals kg,
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int offset,
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int numkeys,
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int numsteps,
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int step,
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int k0,
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int k1,
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int k2,
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int k3,
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float4 keys[4])
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{
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if (step == numsteps) {
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/* center step: regular key location */
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keys[0] = kernel_tex_fetch(__curve_keys, k0);
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keys[1] = kernel_tex_fetch(__curve_keys, k1);
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keys[2] = kernel_tex_fetch(__curve_keys, k2);
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keys[3] = kernel_tex_fetch(__curve_keys, k3);
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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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keys[0] = kernel_tex_fetch(__attributes_float4, offset + k0);
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keys[1] = kernel_tex_fetch(__attributes_float4, offset + k1);
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keys[2] = kernel_tex_fetch(__attributes_float4, offset + k2);
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keys[3] = kernel_tex_fetch(__attributes_float4, offset + k3);
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}
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}
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/* return 2 curve key locations */
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ccl_device_inline void motion_curve_keys(KernelGlobals kg,
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int object,
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int prim,
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float time,
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int k0,
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int k1,
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int k2,
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int k3,
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float4 keys[4])
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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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const int maxstep = numsteps * 2;
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const int step = min((int)(time * maxstep), maxstep - 1);
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const float t = time * maxstep - step;
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/* find attribute */
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const 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 next_keys[4];
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motion_curve_keys_for_step(kg, offset, numkeys, numsteps, step, k0, k1, k2, k3, keys);
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motion_curve_keys_for_step(kg, offset, numkeys, numsteps, step + 1, k0, k1, k2, k3, next_keys);
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/* interpolate between steps */
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keys[0] = (1.0f - t) * keys[0] + t * next_keys[0];
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keys[1] = (1.0f - t) * keys[1] + t * next_keys[1];
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keys[2] = (1.0f - t) * keys[2] + t * next_keys[2];
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keys[3] = (1.0f - t) * keys[3] + t * next_keys[3];
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}
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#endif
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CCL_NAMESPACE_END
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