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Diffstat (limited to 'intern/cycles/bvh/bvh2.cpp')
| -rw-r--r-- | intern/cycles/bvh/bvh2.cpp | 364 |
1 files changed, 364 insertions, 0 deletions
diff --git a/intern/cycles/bvh/bvh2.cpp b/intern/cycles/bvh/bvh2.cpp new file mode 100644 index 00000000000..340ba7dcf53 --- /dev/null +++ b/intern/cycles/bvh/bvh2.cpp @@ -0,0 +1,364 @@ +/* + * Adapted from code copyright 2009-2010 NVIDIA Corporation + * Modifications Copyright 2011, 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. + */ + +#include "bvh/bvh2.h" + +#include "render/mesh.h" +#include "render/object.h" + +#include "bvh/bvh_node.h" +#include "bvh/bvh_unaligned.h" + +CCL_NAMESPACE_BEGIN + +static bool node_bvh_is_unaligned(const BVHNode *node) +{ + const BVHNode *node0 = node->get_child(0), + *node1 = node->get_child(1); + return node0->is_unaligned || node1->is_unaligned; +} + +BVH2::BVH2(const BVHParams& params_, const vector<Object*>& objects_) +: BVH(params_, objects_) +{ +} + +void BVH2::pack_leaf(const BVHStackEntry& e, + const LeafNode *leaf) +{ + assert(e.idx + BVH_NODE_LEAF_SIZE <= pack.leaf_nodes.size()); + float4 data[BVH_NODE_LEAF_SIZE]; + memset(data, 0, sizeof(data)); + if(leaf->num_triangles() == 1 && pack.prim_index[leaf->lo] == -1) { + /* object */ + data[0].x = __int_as_float(~(leaf->lo)); + data[0].y = __int_as_float(0); + } + else { + /* triangle */ + data[0].x = __int_as_float(leaf->lo); + data[0].y = __int_as_float(leaf->hi); + } + data[0].z = __uint_as_float(leaf->visibility); + if(leaf->num_triangles() != 0) { + data[0].w = __uint_as_float(pack.prim_type[leaf->lo]); + } + + memcpy(&pack.leaf_nodes[e.idx], data, sizeof(float4)*BVH_NODE_LEAF_SIZE); +} + +void BVH2::pack_inner(const BVHStackEntry& e, + const BVHStackEntry& e0, + const BVHStackEntry& e1) +{ + if(e0.node->is_unaligned || e1.node->is_unaligned) { + pack_unaligned_inner(e, e0, e1); + } else { + pack_aligned_inner(e, e0, e1); + } +} + +void BVH2::pack_aligned_inner(const BVHStackEntry& e, + const BVHStackEntry& e0, + const BVHStackEntry& e1) +{ + pack_aligned_node(e.idx, + e0.node->bounds, e1.node->bounds, + e0.encodeIdx(), e1.encodeIdx(), + e0.node->visibility, e1.node->visibility); +} + +void BVH2::pack_aligned_node(int idx, + const BoundBox& b0, + const BoundBox& b1, + int c0, int c1, + uint visibility0, uint visibility1) +{ + assert(idx + BVH_NODE_SIZE <= pack.nodes.size()); + assert(c0 < 0 || c0 < pack.nodes.size()); + assert(c1 < 0 || c1 < pack.nodes.size()); + + int4 data[BVH_NODE_SIZE] = { + make_int4(visibility0 & ~PATH_RAY_NODE_UNALIGNED, + visibility1 & ~PATH_RAY_NODE_UNALIGNED, + c0, c1), + make_int4(__float_as_int(b0.min.x), + __float_as_int(b1.min.x), + __float_as_int(b0.max.x), + __float_as_int(b1.max.x)), + make_int4(__float_as_int(b0.min.y), + __float_as_int(b1.min.y), + __float_as_int(b0.max.y), + __float_as_int(b1.max.y)), + make_int4(__float_as_int(b0.min.z), + __float_as_int(b1.min.z), + __float_as_int(b0.max.z), + __float_as_int(b1.max.z)), + }; + + memcpy(&pack.nodes[idx], data, sizeof(int4)*BVH_NODE_SIZE); +} + +void BVH2::pack_unaligned_inner(const BVHStackEntry& e, + const BVHStackEntry& e0, + const BVHStackEntry& e1) +{ + pack_unaligned_node(e.idx, + e0.node->get_aligned_space(), + e1.node->get_aligned_space(), + e0.node->bounds, + e1.node->bounds, + e0.encodeIdx(), e1.encodeIdx(), + e0.node->visibility, e1.node->visibility); +} + +void BVH2::pack_unaligned_node(int idx, + const Transform& aligned_space0, + const Transform& aligned_space1, + const BoundBox& bounds0, + const BoundBox& bounds1, + int c0, int c1, + uint visibility0, uint visibility1) +{ + assert(idx + BVH_UNALIGNED_NODE_SIZE <= pack.nodes.size()); + assert(c0 < 0 || c0 < pack.nodes.size()); + assert(c1 < 0 || c1 < pack.nodes.size()); + + float4 data[BVH_UNALIGNED_NODE_SIZE]; + Transform space0 = BVHUnaligned::compute_node_transform(bounds0, + aligned_space0); + Transform space1 = BVHUnaligned::compute_node_transform(bounds1, + aligned_space1); + data[0] = make_float4(__int_as_float(visibility0 | PATH_RAY_NODE_UNALIGNED), + __int_as_float(visibility1 | PATH_RAY_NODE_UNALIGNED), + __int_as_float(c0), + __int_as_float(c1)); + + data[1] = space0.x; + data[2] = space0.y; + data[3] = space0.z; + data[4] = space1.x; + data[5] = space1.y; + data[6] = space1.z; + + memcpy(&pack.nodes[idx], data, sizeof(float4)*BVH_UNALIGNED_NODE_SIZE); +} + +void BVH2::pack_nodes(const BVHNode *root) +{ + const size_t num_nodes = root->getSubtreeSize(BVH_STAT_NODE_COUNT); + const size_t num_leaf_nodes = root->getSubtreeSize(BVH_STAT_LEAF_COUNT); + assert(num_leaf_nodes <= num_nodes); + const size_t num_inner_nodes = num_nodes - num_leaf_nodes; + size_t node_size; + if(params.use_unaligned_nodes) { + const size_t num_unaligned_nodes = + root->getSubtreeSize(BVH_STAT_UNALIGNED_INNER_COUNT); + node_size = (num_unaligned_nodes * BVH_UNALIGNED_NODE_SIZE) + + (num_inner_nodes - num_unaligned_nodes) * BVH_NODE_SIZE; + } + else { + node_size = num_inner_nodes * BVH_NODE_SIZE; + } + /* Resize arrays */ + pack.nodes.clear(); + pack.leaf_nodes.clear(); + /* For top level BVH, first merge existing BVH's so we know the offsets. */ + if(params.top_level) { + pack_instances(node_size, num_leaf_nodes*BVH_NODE_LEAF_SIZE); + } + else { + pack.nodes.resize(node_size); + pack.leaf_nodes.resize(num_leaf_nodes*BVH_NODE_LEAF_SIZE); + } + + int nextNodeIdx = 0, nextLeafNodeIdx = 0; + + vector<BVHStackEntry> stack; + stack.reserve(BVHParams::MAX_DEPTH*2); + if(root->is_leaf()) { + stack.push_back(BVHStackEntry(root, nextLeafNodeIdx++)); + } + else { + stack.push_back(BVHStackEntry(root, nextNodeIdx)); + nextNodeIdx += node_bvh_is_unaligned(root) + ? BVH_UNALIGNED_NODE_SIZE + : BVH_NODE_SIZE; + } + + while(stack.size()) { + BVHStackEntry e = stack.back(); + stack.pop_back(); + + if(e.node->is_leaf()) { + /* leaf node */ + const LeafNode *leaf = reinterpret_cast<const LeafNode*>(e.node); + pack_leaf(e, leaf); + } + else { + /* innner node */ + int idx[2]; + for(int i = 0; i < 2; ++i) { + if(e.node->get_child(i)->is_leaf()) { + idx[i] = nextLeafNodeIdx++; + } + else { + idx[i] = nextNodeIdx; + nextNodeIdx += node_bvh_is_unaligned(e.node->get_child(i)) + ? BVH_UNALIGNED_NODE_SIZE + : BVH_NODE_SIZE; + } + } + + stack.push_back(BVHStackEntry(e.node->get_child(0), idx[0])); + stack.push_back(BVHStackEntry(e.node->get_child(1), idx[1])); + + pack_inner(e, stack[stack.size()-2], stack[stack.size()-1]); + } + } + assert(node_size == nextNodeIdx); + /* root index to start traversal at, to handle case of single leaf node */ + pack.root_index = (root->is_leaf())? -1: 0; +} + +void BVH2::refit_nodes() +{ + assert(!params.top_level); + + BoundBox bbox = BoundBox::empty; + uint visibility = 0; + refit_node(0, (pack.root_index == -1)? true: false, bbox, visibility); +} + +void BVH2::refit_node(int idx, bool leaf, BoundBox& bbox, uint& visibility) +{ + if(leaf) { + assert(idx + BVH_NODE_LEAF_SIZE <= pack.leaf_nodes.size()); + const int4 *data = &pack.leaf_nodes[idx]; + const int c0 = data[0].x; + const int c1 = data[0].y; + /* refit leaf node */ + for(int prim = c0; prim < c1; prim++) { + int pidx = pack.prim_index[prim]; + int tob = pack.prim_object[prim]; + Object *ob = objects[tob]; + + if(pidx == -1) { + /* object instance */ + bbox.grow(ob->bounds); + } + else { + /* primitives */ + const Mesh *mesh = ob->mesh; + + if(pack.prim_type[prim] & PRIMITIVE_ALL_CURVE) { + /* curves */ + int str_offset = (params.top_level)? mesh->curve_offset: 0; + Mesh::Curve curve = mesh->get_curve(pidx - str_offset); + int k = PRIMITIVE_UNPACK_SEGMENT(pack.prim_type[prim]); + + curve.bounds_grow(k, &mesh->curve_keys[0], &mesh->curve_radius[0], bbox); + + visibility |= PATH_RAY_CURVE; + + /* motion curves */ + if(mesh->use_motion_blur) { + Attribute *attr = mesh->curve_attributes.find(ATTR_STD_MOTION_VERTEX_POSITION); + + if(attr) { + size_t mesh_size = mesh->curve_keys.size(); + size_t steps = mesh->motion_steps - 1; + float3 *key_steps = attr->data_float3(); + + for(size_t i = 0; i < steps; i++) + curve.bounds_grow(k, key_steps + i*mesh_size, &mesh->curve_radius[0], bbox); + } + } + } + else { + /* triangles */ + int tri_offset = (params.top_level)? mesh->tri_offset: 0; + Mesh::Triangle triangle = mesh->get_triangle(pidx - tri_offset); + const float3 *vpos = &mesh->verts[0]; + + triangle.bounds_grow(vpos, bbox); + + /* motion triangles */ + if(mesh->use_motion_blur) { + Attribute *attr = mesh->attributes.find(ATTR_STD_MOTION_VERTEX_POSITION); + + if(attr) { + size_t mesh_size = mesh->verts.size(); + size_t steps = mesh->motion_steps - 1; + float3 *vert_steps = attr->data_float3(); + + for(size_t i = 0; i < steps; i++) + triangle.bounds_grow(vert_steps + i*mesh_size, bbox); + } + } + } + } + + visibility |= ob->visibility; + } + + /* TODO(sergey): De-duplicate with pack_leaf(). */ + float4 leaf_data[BVH_NODE_LEAF_SIZE]; + leaf_data[0].x = __int_as_float(c0); + leaf_data[0].y = __int_as_float(c1); + leaf_data[0].z = __uint_as_float(visibility); + leaf_data[0].w = __uint_as_float(data[0].w); + memcpy(&pack.leaf_nodes[idx], leaf_data, sizeof(float4)*BVH_NODE_LEAF_SIZE); + } + else { + assert(idx + BVH_NODE_SIZE <= pack.nodes.size()); + + const int4 *data = &pack.nodes[idx]; + const bool is_unaligned = (data[0].x & PATH_RAY_NODE_UNALIGNED) != 0; + const int c0 = data[0].z; + const int c1 = data[0].w; + /* refit inner node, set bbox from children */ + BoundBox bbox0 = BoundBox::empty, bbox1 = BoundBox::empty; + uint visibility0 = 0, visibility1 = 0; + + refit_node((c0 < 0)? -c0-1: c0, (c0 < 0), bbox0, visibility0); + refit_node((c1 < 0)? -c1-1: c1, (c1 < 0), bbox1, visibility1); + + if(is_unaligned) { + Transform aligned_space = transform_identity(); + pack_unaligned_node(idx, + aligned_space, aligned_space, + bbox0, bbox1, + c0, c1, + visibility0, + visibility1); + } + else { + pack_aligned_node(idx, + bbox0, bbox1, + c0, c1, + visibility0, + visibility1); + } + + bbox.grow(bbox0); + bbox.grow(bbox1); + visibility = visibility0|visibility1; + } +} + +CCL_NAMESPACE_END |