forked from bartvdbraak/blender
149 lines
5.0 KiB
C
149 lines
5.0 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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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 int find_attribute_curve_motion(KernelGlobals *kg, int object, uint id, AttributeElement *elem)
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{
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/* todo: find a better (faster) solution for this, maybe store offset per object */
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uint attr_offset = object*kernel_data.bvh.attributes_map_stride + ATTR_PRIM_CURVE;
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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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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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*elem = (AttributeElement)attr_map.y;
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/* return result */
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return (attr_map.y == ATTR_ELEMENT_NONE) ? (int)ATTR_STD_NOT_FOUND : (int)attr_map.z;
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}
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ccl_device_inline void motion_curve_keys_for_step(KernelGlobals *kg, int offset, int numkeys, int numsteps, int step, int k0, int k1, float4 keys[2])
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{
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if(step == numsteps) {
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/* center step: regular vertex 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 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_float3, offset + k0);
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keys[1] = kernel_tex_fetch(__attributes_float3, 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(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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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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AttributeElement elem;
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int offset = find_attribute_curve_motion(kg, object, ATTR_STD_MOTION_VERTEX_POSITION, &elem);
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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(kg, offset, numkeys, numsteps, step, k0, k1, keys);
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motion_curve_keys_for_step(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_cardinal_curve_keys_for_step(KernelGlobals *kg, int offset, int numkeys, int numsteps, int step, int k0, int k1, int k2, int k3, float4 keys[4])
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{
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if(step == numsteps) {
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/* center step: regular vertex 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 not store 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_float3, offset + k0);
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keys[1] = kernel_tex_fetch(__attributes_float3, offset + k1);
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keys[2] = kernel_tex_fetch(__attributes_float3, offset + k2);
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keys[3] = kernel_tex_fetch(__attributes_float3, 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_cardinal_curve_keys(KernelGlobals *kg, int object, int prim, float time, int k0, int k1, int k2, int k3, 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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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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AttributeElement elem;
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int offset = find_attribute_curve_motion(kg, object, ATTR_STD_MOTION_VERTEX_POSITION, &elem);
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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_cardinal_curve_keys_for_step(kg, offset, numkeys, numsteps, step, k0, k1, k2, k3, keys);
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motion_cardinal_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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