275 lines
12 KiB
C++
275 lines
12 KiB
C++
// Copyright 2009-2020 Intel Corporation
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// SPDX-License-Identifier: Apache-2.0
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#pragma once
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#include "../common/ray.h"
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#include "../common/scene_subdiv_mesh.h"
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#include "../bvh/bvh.h"
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#include "../subdiv/tessellation.h"
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#include "../subdiv/tessellation_cache.h"
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#include "subdivpatch1.h"
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namespace embree
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{
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namespace isa
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{
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class GridSOA
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{
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public:
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/*! GridSOA constructor */
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GridSOA(const SubdivPatch1Base* patches, const unsigned time_steps,
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const unsigned x0, const unsigned x1, const unsigned y0, const unsigned y1, const unsigned swidth, const unsigned sheight,
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const SubdivMesh* const geom, const size_t totalBvhBytes, const size_t gridBytes, BBox3fa* bounds_o = nullptr);
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/*! Subgrid creation */
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template<typename Allocator>
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static GridSOA* create(const SubdivPatch1Base* patches, const unsigned time_steps,
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unsigned x0, unsigned x1, unsigned y0, unsigned y1,
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const Scene* scene, Allocator& alloc, BBox3fa* bounds_o = nullptr)
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{
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const unsigned width = x1-x0+1;
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const unsigned height = y1-y0+1;
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const GridRange range(0,width-1,0,height-1);
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size_t bvhBytes = 0;
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if (time_steps == 1)
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bvhBytes = getBVHBytes(range,sizeof(BVH4::AABBNode),0);
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else {
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bvhBytes = (time_steps-1)*getBVHBytes(range,sizeof(BVH4::AABBNodeMB),0);
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bvhBytes += getTemporalBVHBytes(make_range(0,int(time_steps-1)),sizeof(BVH4::AABBNodeMB4D));
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}
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const size_t gridBytes = 4*size_t(width)*size_t(height)*sizeof(float);
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size_t rootBytes = time_steps*sizeof(BVH4::NodeRef);
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#if !defined(__X86_64__) && !defined(__aarch64__)
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rootBytes += 4; // We read 2 elements behind the grid. As we store at least 8 root bytes after the grid we are fine in 64 bit mode. But in 32 bit mode we have to do additional padding.
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#endif
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void* data = alloc(offsetof(GridSOA,data)+bvhBytes+time_steps*gridBytes+rootBytes);
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assert(data);
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return new (data) GridSOA(patches,time_steps,x0,x1,y0,y1,patches->grid_u_res,patches->grid_v_res,scene->get<SubdivMesh>(patches->geomID()),bvhBytes,gridBytes,bounds_o);
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}
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/*! Grid creation */
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template<typename Allocator>
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static GridSOA* create(const SubdivPatch1Base* const patches, const unsigned time_steps,
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const Scene* scene, const Allocator& alloc, BBox3fa* bounds_o = nullptr)
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{
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return create(patches,time_steps,0,patches->grid_u_res-1,0,patches->grid_v_res-1,scene,alloc,bounds_o);
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}
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/*! returns reference to root */
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__forceinline BVH4::NodeRef& root(size_t t = 0) { return (BVH4::NodeRef&)data[rootOffset + t*sizeof(BVH4::NodeRef)]; }
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__forceinline const BVH4::NodeRef& root(size_t t = 0) const { return (BVH4::NodeRef&)data[rootOffset + t*sizeof(BVH4::NodeRef)]; }
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/*! returns pointer to BVH array */
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__forceinline int8_t* bvhData() { return &data[0]; }
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__forceinline const int8_t* bvhData() const { return &data[0]; }
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/*! returns pointer to Grid array */
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__forceinline float* gridData(size_t t = 0) { return (float*) &data[gridOffset + t*gridBytes]; }
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__forceinline const float* gridData(size_t t = 0) const { return (float*) &data[gridOffset + t*gridBytes]; }
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__forceinline void* encodeLeaf(size_t u, size_t v) {
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return (void*) (16*(v * width + u + 1)); // +1 to not create empty leaf
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}
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__forceinline float* decodeLeaf(size_t t, const void* ptr) {
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return gridData(t) + (((size_t) (ptr) >> 4) - 1);
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}
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/*! returns the size of the BVH over the grid in bytes */
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static size_t getBVHBytes(const GridRange& range, const size_t nodeBytes, const size_t leafBytes);
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/*! returns the size of the temporal BVH over the time range BVHs */
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static size_t getTemporalBVHBytes(const range<int> time_range, const size_t nodeBytes);
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/*! calculates bounding box of grid range */
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__forceinline BBox3fa calculateBounds(size_t time, const GridRange& range) const
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{
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const float* const grid_array = gridData(time);
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const float* const grid_x_array = grid_array + 0 * dim_offset;
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const float* const grid_y_array = grid_array + 1 * dim_offset;
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const float* const grid_z_array = grid_array + 2 * dim_offset;
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/* compute the bounds just for the range! */
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BBox3fa bounds( empty );
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for (unsigned v = range.v_start; v<=range.v_end; v++)
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{
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for (unsigned u = range.u_start; u<=range.u_end; u++)
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{
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const float x = grid_x_array[ v * width + u];
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const float y = grid_y_array[ v * width + u];
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const float z = grid_z_array[ v * width + u];
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bounds.extend( Vec3fa(x,y,z) );
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}
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}
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assert(is_finite(bounds));
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return bounds;
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}
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/*! Evaluates grid over patch and builds BVH4 tree over the grid. */
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std::pair<BVH4::NodeRef,BBox3fa> buildBVH(BBox3fa* bounds_o);
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/*! Create BVH4 tree over grid. */
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std::pair<BVH4::NodeRef,BBox3fa> buildBVH(const GridRange& range, size_t& allocator);
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/*! Evaluates grid over patch and builds MSMBlur BVH4 tree over the grid. */
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std::pair<BVH4::NodeRef,LBBox3fa> buildMSMBlurBVH(const range<int> time_range, BBox3fa* bounds_o);
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/*! Create MBlur BVH4 tree over grid. */
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std::pair<BVH4::NodeRef,LBBox3fa> buildMBlurBVH(size_t time, const GridRange& range, size_t& allocator);
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/*! Create MSMBlur BVH4 tree over grid. */
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std::pair<BVH4::NodeRef,LBBox3fa> buildMSMBlurBVH(const range<int> time_range, size_t& allocator, BBox3fa* bounds_o);
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template<typename Loader>
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struct MapUV
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{
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typedef typename Loader::vfloat vfloat;
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const float* const grid_uv;
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size_t line_offset;
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size_t lines;
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__forceinline MapUV(const float* const grid_uv, size_t line_offset, const size_t lines)
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: grid_uv(grid_uv), line_offset(line_offset), lines(lines) {}
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__forceinline void operator() (vfloat& u, vfloat& v) const {
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const Vec3<vfloat> tri_v012_uv = Loader::gather(grid_uv,line_offset,lines);
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const Vec2<vfloat> uv0 = GridSOA::decodeUV(tri_v012_uv[0]);
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const Vec2<vfloat> uv1 = GridSOA::decodeUV(tri_v012_uv[1]);
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const Vec2<vfloat> uv2 = GridSOA::decodeUV(tri_v012_uv[2]);
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const Vec2<vfloat> uv = u * uv1 + v * uv2 + (1.0f-u-v) * uv0;
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u = uv[0];v = uv[1];
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}
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};
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struct Gather2x3
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{
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enum { M = 4 };
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typedef vbool4 vbool;
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typedef vint4 vint;
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typedef vfloat4 vfloat;
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static __forceinline const Vec3vf4 gather(const float* const grid, const size_t line_offset, const size_t lines)
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{
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vfloat4 r0 = vfloat4::loadu(grid + 0*line_offset);
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vfloat4 r1 = vfloat4::loadu(grid + 1*line_offset); // this accesses 2 elements too much in case of 2x2 grid, but this is ok as we ensure enough padding after the grid
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if (unlikely(line_offset == 2))
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{
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r0 = shuffle<0,1,1,1>(r0);
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r1 = shuffle<0,1,1,1>(r1);
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}
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return Vec3vf4(unpacklo(r0,r1), // r00, r10, r01, r11
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shuffle<1,1,2,2>(r0), // r01, r01, r02, r02
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shuffle<0,1,1,2>(r1)); // r10, r11, r11, r12
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}
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static __forceinline void gather(const float* const grid_x,
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const float* const grid_y,
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const float* const grid_z,
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const size_t line_offset,
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const size_t lines,
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Vec3vf4& v0_o,
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Vec3vf4& v1_o,
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Vec3vf4& v2_o)
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{
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const Vec3vf4 tri_v012_x = gather(grid_x,line_offset,lines);
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const Vec3vf4 tri_v012_y = gather(grid_y,line_offset,lines);
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const Vec3vf4 tri_v012_z = gather(grid_z,line_offset,lines);
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v0_o = Vec3vf4(tri_v012_x[0],tri_v012_y[0],tri_v012_z[0]);
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v1_o = Vec3vf4(tri_v012_x[1],tri_v012_y[1],tri_v012_z[1]);
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v2_o = Vec3vf4(tri_v012_x[2],tri_v012_y[2],tri_v012_z[2]);
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}
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};
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#if defined (__AVX__)
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struct Gather3x3
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{
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enum { M = 8 };
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typedef vbool8 vbool;
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typedef vint8 vint;
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typedef vfloat8 vfloat;
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static __forceinline const Vec3vf8 gather(const float* const grid, const size_t line_offset, const size_t lines)
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{
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vfloat4 ra = vfloat4::loadu(grid + 0*line_offset);
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vfloat4 rb = vfloat4::loadu(grid + 1*line_offset); // this accesses 2 elements too much in case of 2x2 grid, but this is ok as we ensure enough padding after the grid
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vfloat4 rc;
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if (likely(lines > 2))
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rc = vfloat4::loadu(grid + 2*line_offset);
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else
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rc = rb;
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if (unlikely(line_offset == 2))
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{
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ra = shuffle<0,1,1,1>(ra);
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rb = shuffle<0,1,1,1>(rb);
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rc = shuffle<0,1,1,1>(rc);
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}
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const vfloat8 r0 = vfloat8(ra,rb);
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const vfloat8 r1 = vfloat8(rb,rc);
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return Vec3vf8(unpacklo(r0,r1), // r00, r10, r01, r11, r10, r20, r11, r21
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shuffle<1,1,2,2>(r0), // r01, r01, r02, r02, r11, r11, r12, r12
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shuffle<0,1,1,2>(r1)); // r10, r11, r11, r12, r20, r21, r21, r22
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}
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static __forceinline void gather(const float* const grid_x,
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const float* const grid_y,
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const float* const grid_z,
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const size_t line_offset,
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const size_t lines,
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Vec3vf8& v0_o,
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Vec3vf8& v1_o,
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Vec3vf8& v2_o)
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{
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const Vec3vf8 tri_v012_x = gather(grid_x,line_offset,lines);
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const Vec3vf8 tri_v012_y = gather(grid_y,line_offset,lines);
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const Vec3vf8 tri_v012_z = gather(grid_z,line_offset,lines);
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v0_o = Vec3vf8(tri_v012_x[0],tri_v012_y[0],tri_v012_z[0]);
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v1_o = Vec3vf8(tri_v012_x[1],tri_v012_y[1],tri_v012_z[1]);
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v2_o = Vec3vf8(tri_v012_x[2],tri_v012_y[2],tri_v012_z[2]);
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}
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};
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#endif
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template<typename vfloat>
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static __forceinline Vec2<vfloat> decodeUV(const vfloat& uv)
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{
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typedef typename vfloat::Int vint;
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const vint iu = asInt(uv) & 0xffff;
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const vint iv = srl(asInt(uv),16);
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const vfloat u = (vfloat)iu * vfloat(8.0f/0x10000);
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const vfloat v = (vfloat)iv * vfloat(8.0f/0x10000);
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return Vec2<vfloat>(u,v);
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}
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__forceinline unsigned int geomID() const {
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return _geomID;
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}
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__forceinline unsigned int primID() const {
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return _primID;
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}
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public:
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BVH4::NodeRef troot;
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#if !defined(__X86_64__) && !defined(__aarch64__)
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unsigned align1;
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#endif
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unsigned time_steps;
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unsigned width;
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unsigned height;
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unsigned dim_offset;
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unsigned _geomID;
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unsigned _primID;
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unsigned align2;
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unsigned gridOffset;
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unsigned gridBytes;
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unsigned rootOffset;
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int8_t data[1]; //!< after the struct we first store the BVH, then the grid, and finally the roots
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};
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}
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}
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