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Diffstat (limited to 'intern/cycles/kernel/geom/motion_triangle_shader.h')
| -rw-r--r-- | intern/cycles/kernel/geom/motion_triangle_shader.h | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/intern/cycles/kernel/geom/motion_triangle_shader.h b/intern/cycles/kernel/geom/motion_triangle_shader.h new file mode 100644 index 00000000000..fc7c181882e --- /dev/null +++ b/intern/cycles/kernel/geom/motion_triangle_shader.h @@ -0,0 +1,117 @@ +/* + * Copyright 2011-2016 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 + +CCL_NAMESPACE_BEGIN + +/* Setup of motion triangle specific parts of ShaderData, moved into this one + * function to more easily share computation of interpolated positions and + * normals */ + +/* return 3 triangle vertex normals */ +ccl_device_noinline void motion_triangle_shader_setup(KernelGlobals kg, + ccl_private ShaderData *sd, + const float3 P, + const float3 D, + const float ray_t, + const int isect_object, + const int isect_prim, + bool is_local) +{ + /* Get shader. */ + sd->shader = kernel_tex_fetch(__tri_shader, sd->prim); + /* Get motion info. */ + /* TODO(sergey): This logic is really similar to motion_triangle_vertices(), + * can we de-duplicate something here? + */ + int numsteps, numverts; + object_motion_info(kg, sd->object, &numsteps, &numverts, NULL); + /* Figure out which steps we need to fetch and their interpolation factor. */ + int maxstep = numsteps * 2; + int step = min((int)(sd->time * maxstep), maxstep - 1); + float t = sd->time * maxstep - step; + /* Find attribute. */ + int offset = intersection_find_attribute(kg, sd->object, ATTR_STD_MOTION_VERTEX_POSITION); + kernel_assert(offset != ATTR_STD_NOT_FOUND); + /* Fetch vertex coordinates. */ + float3 verts[3], next_verts[3]; + uint4 tri_vindex = kernel_tex_fetch(__tri_vindex, sd->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]; + /* Compute refined position. */ +#ifdef __BVH_LOCAL__ + if (is_local) { + sd->P = motion_triangle_refine_local(kg, sd, P, D, ray_t, isect_object, isect_prim, verts); + } + else +#endif /* __BVH_LOCAL__*/ + { + sd->P = motion_triangle_refine(kg, sd, P, D, ray_t, isect_object, isect_prim, verts); + } + /* Compute face normal. */ + float3 Ng; + if (sd->object_flag & SD_OBJECT_NEGATIVE_SCALE_APPLIED) { + Ng = normalize(cross(verts[2] - verts[0], verts[1] - verts[0])); + } + else { + Ng = normalize(cross(verts[1] - verts[0], verts[2] - verts[0])); + } + sd->Ng = Ng; + sd->N = Ng; + /* Compute derivatives of P w.r.t. uv. */ +#ifdef __DPDU__ + sd->dPdu = (verts[0] - verts[2]); + sd->dPdv = (verts[1] - verts[2]); +#endif + /* Compute smooth normal. */ + if (sd->shader & SHADER_SMOOTH_NORMAL) { + /* Find attribute. */ + int offset = intersection_find_attribute(kg, sd->object, ATTR_STD_MOTION_VERTEX_NORMAL); + kernel_assert(offset != ATTR_STD_NOT_FOUND); + /* Fetch vertex coordinates. */ + float3 normals[3], next_normals[3]; + 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 u = sd->u; + float v = sd->v; + float w = 1.0f - u - v; + sd->N = (u * normals[0] + v * normals[1] + w * normals[2]); + } +} + +CCL_NAMESPACE_END |