ff1883307f
* Rename "texture" to "data array". This has not used textures for a long time, there are just global memory arrays now. (On old CUDA GPUs there was a cache for textures but not global memory, so we used to put all data in textures.) * For CUDA and HIP, put globals in KernelParams struct like other devices. * Drop __ prefix for data array names, no possibility for naming conflict now that these are in a struct.
189 lines
7.0 KiB
C
189 lines
7.0 KiB
C
/* SPDX-License-Identifier: Apache-2.0
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* Copyright 2011-2022 Blender Foundation */
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/* Motion Triangle Primitive
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*
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* These are stored as regular triangles, plus extra positions and normals at
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* times other than the frame center. Computing the triangle vertex positions
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* or normals at a given ray time is a matter of interpolation of the two steps
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* between which the ray time lies.
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*
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* The extra positions and normals are stored as ATTR_STD_MOTION_VERTEX_POSITION
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* and ATTR_STD_MOTION_VERTEX_NORMAL mesh attributes.
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*/
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#pragma once
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#include "kernel/bvh/util.h"
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CCL_NAMESPACE_BEGIN
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/* Time interpolation of vertex positions and normals */
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ccl_device_inline void motion_triangle_verts_for_step(KernelGlobals kg,
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uint4 tri_vindex,
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int offset,
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int numverts,
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int numsteps,
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int step,
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float3 verts[3])
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{
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if (step == numsteps) {
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/* center step: regular vertex location */
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verts[0] = kernel_data_fetch(tri_verts, tri_vindex.w + 0);
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verts[1] = kernel_data_fetch(tri_verts, tri_vindex.w + 1);
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verts[2] = kernel_data_fetch(tri_verts, tri_vindex.w + 2);
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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 * numverts;
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verts[0] = kernel_data_fetch(attributes_float3, offset + tri_vindex.x);
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verts[1] = kernel_data_fetch(attributes_float3, offset + tri_vindex.y);
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verts[2] = kernel_data_fetch(attributes_float3, offset + tri_vindex.z);
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}
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}
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ccl_device_inline void motion_triangle_normals_for_step(KernelGlobals kg,
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uint4 tri_vindex,
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int offset,
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int numverts,
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int numsteps,
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int step,
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float3 normals[3])
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{
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if (step == numsteps) {
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/* center step: regular vertex location */
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normals[0] = kernel_data_fetch(tri_vnormal, tri_vindex.x);
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normals[1] = kernel_data_fetch(tri_vnormal, tri_vindex.y);
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normals[2] = kernel_data_fetch(tri_vnormal, tri_vindex.z);
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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 * numverts;
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normals[0] = kernel_data_fetch(attributes_float3, offset + tri_vindex.x);
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normals[1] = kernel_data_fetch(attributes_float3, offset + tri_vindex.y);
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normals[2] = kernel_data_fetch(attributes_float3, offset + tri_vindex.z);
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}
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}
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ccl_device_inline void motion_triangle_vertices(
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KernelGlobals kg, int object, int prim, float time, float3 verts[3])
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{
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/* get motion info */
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int numsteps, numverts;
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object_motion_info(kg, object, &numsteps, &numverts, NULL);
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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 vertex coordinates */
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float3 next_verts[3];
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uint4 tri_vindex = kernel_data_fetch(tri_vindex, prim);
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motion_triangle_verts_for_step(kg, tri_vindex, offset, numverts, numsteps, step, verts);
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motion_triangle_verts_for_step(kg, tri_vindex, offset, numverts, numsteps, step + 1, next_verts);
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/* interpolate between steps */
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verts[0] = (1.0f - t) * verts[0] + t * next_verts[0];
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verts[1] = (1.0f - t) * verts[1] + t * next_verts[1];
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verts[2] = (1.0f - t) * verts[2] + t * next_verts[2];
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}
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ccl_device_inline void motion_triangle_vertices_and_normals(
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KernelGlobals kg, int object, int prim, float time, float3 verts[3], float3 normals[3])
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{
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/* get motion info */
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int numsteps, numverts;
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object_motion_info(kg, object, &numsteps, &numverts, NULL);
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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 vertex coordinates. */
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float3 next_verts[3];
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uint4 tri_vindex = kernel_data_fetch(tri_vindex, prim);
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motion_triangle_verts_for_step(kg, tri_vindex, offset, numverts, numsteps, step, verts);
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motion_triangle_verts_for_step(kg, tri_vindex, offset, numverts, numsteps, step + 1, next_verts);
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/* Interpolate between steps. */
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verts[0] = (1.0f - t) * verts[0] + t * next_verts[0];
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verts[1] = (1.0f - t) * verts[1] + t * next_verts[1];
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verts[2] = (1.0f - t) * verts[2] + t * next_verts[2];
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/* Compute smooth normal. */
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/* Find attribute. */
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offset = intersection_find_attribute(kg, object, ATTR_STD_MOTION_VERTEX_NORMAL);
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kernel_assert(offset != ATTR_STD_NOT_FOUND);
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/* Fetch vertex coordinates. */
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float3 next_normals[3];
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motion_triangle_normals_for_step(kg, tri_vindex, offset, numverts, numsteps, step, normals);
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motion_triangle_normals_for_step(
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kg, tri_vindex, offset, numverts, numsteps, step + 1, next_normals);
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/* Interpolate between steps. */
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normals[0] = (1.0f - t) * normals[0] + t * next_normals[0];
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normals[1] = (1.0f - t) * normals[1] + t * next_normals[1];
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normals[2] = (1.0f - t) * normals[2] + t * next_normals[2];
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}
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ccl_device_inline float3 motion_triangle_smooth_normal(
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KernelGlobals kg, float3 Ng, int object, int prim, float u, float v, float time)
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{
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/* get motion info */
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int numsteps, numverts;
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object_motion_info(kg, object, &numsteps, &numverts, NULL);
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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_NORMAL);
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kernel_assert(offset != ATTR_STD_NOT_FOUND);
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/* fetch normals */
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float3 normals[3], next_normals[3];
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uint4 tri_vindex = kernel_data_fetch(tri_vindex, prim);
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motion_triangle_normals_for_step(kg, tri_vindex, offset, numverts, numsteps, step, normals);
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motion_triangle_normals_for_step(
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kg, tri_vindex, offset, numverts, numsteps, step + 1, next_normals);
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/* interpolate between steps */
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normals[0] = (1.0f - t) * normals[0] + t * next_normals[0];
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normals[1] = (1.0f - t) * normals[1] + t * next_normals[1];
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normals[2] = (1.0f - t) * normals[2] + t * next_normals[2];
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/* interpolate between vertices */
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float w = 1.0f - u - v;
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float3 N = safe_normalize(u * normals[0] + v * normals[1] + w * normals[2]);
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return is_zero(N) ? Ng : N;
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}
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CCL_NAMESPACE_END
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