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Diffstat (limited to 'intern/cycles/kernel/geom/motion_triangle.h')
| -rw-r--r-- | intern/cycles/kernel/geom/motion_triangle.h | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/intern/cycles/kernel/geom/motion_triangle.h b/intern/cycles/kernel/geom/motion_triangle.h new file mode 100644 index 00000000000..43f894938e0 --- /dev/null +++ b/intern/cycles/kernel/geom/motion_triangle.h @@ -0,0 +1,155 @@ +/* + * 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. + */ + +#pragma once + +#include "kernel/bvh/util.h" + +CCL_NAMESPACE_BEGIN + +/* Time interpolation of vertex positions and normals */ + +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(__tri_verts, tri_vindex.w + 0)); + verts[1] = float4_to_float3(kernel_tex_fetch(__tri_verts, tri_vindex.w + 1)); + verts[2] = float4_to_float3(kernel_tex_fetch(__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 */ + int offset = intersection_find_attribute(kg, object, ATTR_STD_MOTION_VERTEX_POSITION); + 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_device_inline float3 motion_triangle_smooth_normal( + KernelGlobals kg, float3 Ng, int object, int prim, float u, float v, float time) +{ + /* 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 */ + int offset = intersection_find_attribute(kg, object, ATTR_STD_MOTION_VERTEX_NORMAL); + kernel_assert(offset != ATTR_STD_NOT_FOUND); + + /* fetch normals */ + float3 normals[3], next_normals[3]; + uint4 tri_vindex = kernel_tex_fetch(__tri_vindex, prim); + + motion_triangle_normals_for_step(kg, tri_vindex, offset, numverts, numsteps, step, normals); + motion_triangle_normals_for_step( + kg, tri_vindex, offset, numverts, numsteps, step + 1, next_normals); + + /* interpolate between steps */ + normals[0] = (1.0f - t) * normals[0] + t * next_normals[0]; + normals[1] = (1.0f - t) * normals[1] + t * next_normals[1]; + normals[2] = (1.0f - t) * normals[2] + t * next_normals[2]; + + /* interpolate between vertices */ + float w = 1.0f - u - v; + float3 N = safe_normalize(u * normals[0] + v * normals[1] + w * normals[2]); + + return is_zero(N) ? Ng : N; +} + +CCL_NAMESPACE_END |