295 lines
10 KiB
C++
295 lines
10 KiB
C++
// Copyright 2009-2021 Intel Corporation
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// SPDX-License-Identifier: Apache-2.0
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#pragma once
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#include "geometry.h"
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#include "buffer.h"
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namespace embree
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{
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/*! Grid Mesh */
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struct GridMesh : public Geometry
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{
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/*! type of this geometry */
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static const Geometry::GTypeMask geom_type = Geometry::MTY_GRID_MESH;
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/*! grid */
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struct Grid
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{
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unsigned int startVtxID;
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unsigned int lineVtxOffset;
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unsigned short resX,resY;
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/* border flags due to 3x3 vertex pattern */
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__forceinline unsigned int get3x3FlagsX(const unsigned int x) const
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{
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return (x + 2 >= (unsigned int)resX) ? (1<<15) : 0;
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}
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/* border flags due to 3x3 vertex pattern */
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__forceinline unsigned int get3x3FlagsY(const unsigned int y) const
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{
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return (y + 2 >= (unsigned int)resY) ? (1<<15) : 0;
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}
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/*! outputs grid structure */
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__forceinline friend embree_ostream operator<<(embree_ostream cout, const Grid& t) {
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return cout << "Grid { startVtxID " << t.startVtxID << ", lineVtxOffset " << t.lineVtxOffset << ", resX " << t.resX << ", resY " << t.resY << " }";
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}
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};
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public:
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/*! grid mesh construction */
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GridMesh (Device* device);
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/* geometry interface */
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public:
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void setMask(unsigned mask);
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void setNumTimeSteps (unsigned int numTimeSteps);
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void setVertexAttributeCount (unsigned int N);
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void setBuffer(RTCBufferType type, unsigned int slot, RTCFormat format, const Ref<Buffer>& buffer, size_t offset, size_t stride, unsigned int num);
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void* getBuffer(RTCBufferType type, unsigned int slot);
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void updateBuffer(RTCBufferType type, unsigned int slot);
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void commit();
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bool verify();
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void interpolate(const RTCInterpolateArguments* const args);
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template<int N>
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void interpolate_impl(const RTCInterpolateArguments* const args)
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{
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unsigned int primID = args->primID;
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float U = args->u;
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float V = args->v;
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/* clamp input u,v to [0;1] range */
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U = max(min(U,1.0f),0.0f);
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V = max(min(V,1.0f),0.0f);
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RTCBufferType bufferType = args->bufferType;
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unsigned int bufferSlot = args->bufferSlot;
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float* P = args->P;
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float* dPdu = args->dPdu;
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float* dPdv = args->dPdv;
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float* ddPdudu = args->ddPdudu;
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float* ddPdvdv = args->ddPdvdv;
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float* ddPdudv = args->ddPdudv;
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unsigned int valueCount = args->valueCount;
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/* calculate base pointer and stride */
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assert((bufferType == RTC_BUFFER_TYPE_VERTEX && bufferSlot < numTimeSteps) ||
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(bufferType == RTC_BUFFER_TYPE_VERTEX_ATTRIBUTE && bufferSlot <= vertexAttribs.size()));
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const char* src = nullptr;
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size_t stride = 0;
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if (bufferType == RTC_BUFFER_TYPE_VERTEX_ATTRIBUTE) {
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src = vertexAttribs[bufferSlot].getPtr();
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stride = vertexAttribs[bufferSlot].getStride();
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} else {
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src = vertices[bufferSlot].getPtr();
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stride = vertices[bufferSlot].getStride();
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}
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const Grid& grid = grids[primID];
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const int grid_width = grid.resX-1;
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const int grid_height = grid.resY-1;
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const float rcp_grid_width = rcp(float(grid_width));
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const float rcp_grid_height = rcp(float(grid_height));
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const int iu = min((int)floor(U*grid_width ),grid_width);
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const int iv = min((int)floor(V*grid_height),grid_height);
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const float u = U*grid_width-float(iu);
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const float v = V*grid_height-float(iv);
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for (unsigned int i=0; i<valueCount; i+=N)
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{
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const size_t ofs = i*sizeof(float);
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const unsigned int idx0 = grid.startVtxID + (iv+0)*grid.lineVtxOffset + iu;
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const unsigned int idx1 = grid.startVtxID + (iv+1)*grid.lineVtxOffset + iu;
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const vbool<N> valid = vint<N>((int)i)+vint<N>(step) < vint<N>(int(valueCount));
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const vfloat<N> p0 = mem<vfloat<N>>::loadu(valid,(float*)&src[(idx0+0)*stride+ofs]);
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const vfloat<N> p1 = mem<vfloat<N>>::loadu(valid,(float*)&src[(idx0+1)*stride+ofs]);
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const vfloat<N> p2 = mem<vfloat<N>>::loadu(valid,(float*)&src[(idx1+1)*stride+ofs]);
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const vfloat<N> p3 = mem<vfloat<N>>::loadu(valid,(float*)&src[(idx1+0)*stride+ofs]);
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const vbool<N> left = u+v <= 1.0f;
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const vfloat<N> Q0 = select(left,p0,p2);
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const vfloat<N> Q1 = select(left,p1,p3);
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const vfloat<N> Q2 = select(left,p3,p1);
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const vfloat<N> U = select(left,u,vfloat<N>(1.0f)-u);
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const vfloat<N> V = select(left,v,vfloat<N>(1.0f)-v);
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const vfloat<N> W = 1.0f-U-V;
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if (P) {
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mem<vfloat<N>>::storeu(valid,P+i,madd(W,Q0,madd(U,Q1,V*Q2)));
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}
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if (dPdu) {
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assert(dPdu); mem<vfloat<N>>::storeu(valid,dPdu+i,select(left,Q1-Q0,Q0-Q1)*rcp_grid_width);
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assert(dPdv); mem<vfloat<N>>::storeu(valid,dPdv+i,select(left,Q2-Q0,Q0-Q2)*rcp_grid_height);
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}
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if (ddPdudu) {
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assert(ddPdudu); mem<vfloat<N>>::storeu(valid,ddPdudu+i,vfloat<N>(zero));
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assert(ddPdvdv); mem<vfloat<N>>::storeu(valid,ddPdvdv+i,vfloat<N>(zero));
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assert(ddPdudv); mem<vfloat<N>>::storeu(valid,ddPdudv+i,vfloat<N>(zero));
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}
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}
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}
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void addElementsToCount (GeometryCounts & counts) const;
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__forceinline unsigned int getNumSubGrids(const size_t gridID)
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{
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const Grid &g = grid(gridID);
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return max((unsigned int)1,((unsigned int)g.resX >> 1) * ((unsigned int)g.resY >> 1));
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}
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/*! get fast access to first vertex buffer */
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__forceinline float * getCompactVertexArray () const {
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return (float*) vertices0.getPtr();
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}
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public:
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/*! returns number of vertices */
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__forceinline size_t numVertices() const {
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return vertices[0].size();
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}
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/*! returns i'th grid*/
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__forceinline const Grid& grid(size_t i) const {
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return grids[i];
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}
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/*! returns i'th vertex of the first time step */
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__forceinline const Vec3fa vertex(size_t i) const { // FIXME: check if this does a unaligned load
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return vertices0[i];
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}
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/*! returns i'th vertex of the first time step */
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__forceinline const char* vertexPtr(size_t i) const {
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return vertices0.getPtr(i);
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}
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/*! returns i'th vertex of itime'th timestep */
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__forceinline const Vec3fa vertex(size_t i, size_t itime) const {
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return vertices[itime][i];
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}
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/*! returns i'th vertex of itime'th timestep */
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__forceinline const char* vertexPtr(size_t i, size_t itime) const {
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return vertices[itime].getPtr(i);
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}
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/*! returns i'th vertex of the first timestep */
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__forceinline size_t grid_vertex_index(const Grid& g, size_t x, size_t y) const {
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assert(x < (size_t)g.resX);
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assert(y < (size_t)g.resY);
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return g.startVtxID + x + y * g.lineVtxOffset;
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}
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/*! returns i'th vertex of the first timestep */
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__forceinline const Vec3fa grid_vertex(const Grid& g, size_t x, size_t y) const {
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const size_t index = grid_vertex_index(g,x,y);
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return vertex(index);
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}
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/*! returns i'th vertex of the itime'th timestep */
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__forceinline const Vec3fa grid_vertex(const Grid& g, size_t x, size_t y, size_t itime) const {
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const size_t index = grid_vertex_index(g,x,y);
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return vertex(index,itime);
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}
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/*! calculates the build bounds of the i'th primitive, if it's valid */
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__forceinline bool buildBounds(const Grid& g, size_t sx, size_t sy, BBox3fa& bbox) const
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{
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BBox3fa b(empty);
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for (size_t t=0; t<numTimeSteps; t++)
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{
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for (size_t y=sy;y<min(sy+3,(size_t)g.resY);y++)
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for (size_t x=sx;x<min(sx+3,(size_t)g.resX);x++)
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{
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const Vec3fa v = grid_vertex(g,x,y,t);
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if (unlikely(!isvalid(v))) return false;
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b.extend(v);
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}
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}
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bbox = b;
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return true;
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}
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/*! calculates the build bounds of the i'th primitive at the itime'th time segment, if it's valid */
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__forceinline bool buildBounds(const Grid& g, size_t sx, size_t sy, size_t itime, BBox3fa& bbox) const
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{
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assert(itime < numTimeSteps);
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BBox3fa b0(empty);
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for (size_t y=sy;y<min(sy+3,(size_t)g.resY);y++)
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for (size_t x=sx;x<min(sx+3,(size_t)g.resX);x++)
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{
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const Vec3fa v = grid_vertex(g,x,y,itime);
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if (unlikely(!isvalid(v))) return false;
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b0.extend(v);
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}
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/* use bounds of first time step in builder */
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bbox = b0;
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return true;
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}
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__forceinline bool valid(size_t gridID, size_t itime=0) const {
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return valid(gridID, make_range(itime, itime));
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}
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/*! check if the i'th primitive is valid between the specified time range */
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__forceinline bool valid(size_t gridID, const range<size_t>& itime_range) const
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{
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if (unlikely(gridID >= grids.size())) return false;
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const Grid &g = grid(gridID);
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if (unlikely(g.startVtxID + 0 >= vertices0.size())) return false;
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if (unlikely(g.startVtxID + (g.resY-1)*g.lineVtxOffset + g.resX-1 >= vertices0.size())) return false;
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for (size_t y=0;y<g.resY;y++)
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for (size_t x=0;x<g.resX;x++)
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for (size_t itime = itime_range.begin(); itime <= itime_range.end(); itime++)
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if (!isvalid(grid_vertex(g,x,y,itime))) return false;
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return true;
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}
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__forceinline BBox3fa bounds(const Grid& g, size_t sx, size_t sy, size_t itime) const
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{
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BBox3fa box(empty);
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buildBounds(g,sx,sy,itime,box);
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return box;
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}
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__forceinline LBBox3fa linearBounds(const Grid& g, size_t sx, size_t sy, size_t itime) const {
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BBox3fa bounds0, bounds1;
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buildBounds(g,sx,sy,itime+0,bounds0);
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buildBounds(g,sx,sy,itime+1,bounds1);
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return LBBox3fa(bounds0,bounds1);
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}
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/*! calculates the linear bounds of the i'th primitive for the specified time range */
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__forceinline LBBox3fa linearBounds(const Grid& g, size_t sx, size_t sy, const BBox1f& dt) const {
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return LBBox3fa([&] (size_t itime) { return bounds(g,sx,sy,itime); }, dt, time_range, fnumTimeSegments);
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}
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public:
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BufferView<Grid> grids; //!< array of triangles
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BufferView<Vec3fa> vertices0; //!< fast access to first vertex buffer
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vector<BufferView<Vec3fa>> vertices; //!< vertex array for each timestep
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vector<RawBufferView> vertexAttribs; //!< vertex attributes
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};
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namespace isa
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{
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struct GridMeshISA : public GridMesh
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{
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GridMeshISA (Device* device)
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: GridMesh(device) {}
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};
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}
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DECLARE_ISA_FUNCTION(GridMesh*, createGridMesh, Device*);
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}
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