1// Copyright 2009-2021 Intel Corporation
2// SPDX-License-Identifier: Apache-2.0
3
4#pragma once
5
6#include "geometry.h"
7#include "buffer.h"
8
9namespace embree
10{
11 /*! Grid Mesh */
12 struct GridMesh : public Geometry
13 {
14 /*! type of this geometry */
15 static const Geometry::GTypeMask geom_type = Geometry::MTY_GRID_MESH;
16
17 /*! grid */
18 struct Grid
19 {
20 unsigned int startVtxID;
21 unsigned int lineVtxOffset;
22 unsigned short resX,resY;
23
24 /* border flags due to 3x3 vertex pattern */
25 __forceinline unsigned int get3x3FlagsX(const unsigned int x) const
26 {
27 return (x + 2 >= (unsigned int)resX) ? (1<<15) : 0;
28 }
29
30 /* border flags due to 3x3 vertex pattern */
31 __forceinline unsigned int get3x3FlagsY(const unsigned int y) const
32 {
33 return (y + 2 >= (unsigned int)resY) ? (1<<15) : 0;
34 }
35
36 /*! outputs grid structure */
37 __forceinline friend embree_ostream operator<<(embree_ostream cout, const Grid& t) {
38 return cout << "Grid { startVtxID " << t.startVtxID << ", lineVtxOffset " << t.lineVtxOffset << ", resX " << t.resX << ", resY " << t.resY << " }";
39 }
40 };
41
42 public:
43
44 /*! grid mesh construction */
45 GridMesh (Device* device);
46
47 /* geometry interface */
48 public:
49 void setMask(unsigned mask);
50 void setNumTimeSteps (unsigned int numTimeSteps);
51 void setVertexAttributeCount (unsigned int N);
52 void setBuffer(RTCBufferType type, unsigned int slot, RTCFormat format, const Ref<Buffer>& buffer, size_t offset, size_t stride, unsigned int num);
53 void* getBuffer(RTCBufferType type, unsigned int slot);
54 void updateBuffer(RTCBufferType type, unsigned int slot);
55 void commit();
56 bool verify();
57 void interpolate(const RTCInterpolateArguments* const args);
58
59 template<int N>
60 void interpolate_impl(const RTCInterpolateArguments* const args)
61 {
62 unsigned int primID = args->primID;
63 float U = args->u;
64 float V = args->v;
65
66 /* clamp input u,v to [0;1] range */
67 U = max(a: min(a: U,b: 1.0f),b: 0.0f);
68 V = max(a: min(a: V,b: 1.0f),b: 0.0f);
69
70 RTCBufferType bufferType = args->bufferType;
71 unsigned int bufferSlot = args->bufferSlot;
72 float* P = args->P;
73 float* dPdu = args->dPdu;
74 float* dPdv = args->dPdv;
75 float* ddPdudu = args->ddPdudu;
76 float* ddPdvdv = args->ddPdvdv;
77 float* ddPdudv = args->ddPdudv;
78 unsigned int valueCount = args->valueCount;
79
80 /* calculate base pointer and stride */
81 assert((bufferType == RTC_BUFFER_TYPE_VERTEX && bufferSlot < numTimeSteps) ||
82 (bufferType == RTC_BUFFER_TYPE_VERTEX_ATTRIBUTE && bufferSlot <= vertexAttribs.size()));
83 const char* src = nullptr;
84 size_t stride = 0;
85 if (bufferType == RTC_BUFFER_TYPE_VERTEX_ATTRIBUTE) {
86 src = vertexAttribs[bufferSlot].getPtr();
87 stride = vertexAttribs[bufferSlot].getStride();
88 } else {
89 src = vertices[bufferSlot].getPtr();
90 stride = vertices[bufferSlot].getStride();
91 }
92
93 const Grid& grid = grids[primID];
94 const int grid_width = grid.resX-1;
95 const int grid_height = grid.resY-1;
96 const float rcp_grid_width = rcp(x: float(grid_width));
97 const float rcp_grid_height = rcp(x: float(grid_height));
98 const int iu = min(a: (int)floor(x: U*grid_width ),b: grid_width);
99 const int iv = min(a: (int)floor(x: V*grid_height),b: grid_height);
100 const float u = U*grid_width-float(iu);
101 const float v = V*grid_height-float(iv);
102
103 for (unsigned int i=0; i<valueCount; i+=N)
104 {
105 const size_t ofs = i*sizeof(float);
106 const unsigned int idx0 = grid.startVtxID + (iv+0)*grid.lineVtxOffset + iu;
107 const unsigned int idx1 = grid.startVtxID + (iv+1)*grid.lineVtxOffset + iu;
108
109 const vbool<N> valid = vint<N>((int)i)+vint<N>(step) < vint<N>(int(valueCount));
110 const vfloat<N> p0 = mem<vfloat<N>>::loadu(valid,(float*)&src[(idx0+0)*stride+ofs]);
111 const vfloat<N> p1 = mem<vfloat<N>>::loadu(valid,(float*)&src[(idx0+1)*stride+ofs]);
112 const vfloat<N> p2 = mem<vfloat<N>>::loadu(valid,(float*)&src[(idx1+1)*stride+ofs]);
113 const vfloat<N> p3 = mem<vfloat<N>>::loadu(valid,(float*)&src[(idx1+0)*stride+ofs]);
114 const vbool<N> left = u+v <= 1.0f;
115 const vfloat<N> Q0 = select(left,p0,p2);
116 const vfloat<N> Q1 = select(left,p1,p3);
117 const vfloat<N> Q2 = select(left,p3,p1);
118 const vfloat<N> U = select(left,u,vfloat<N>(1.0f)-u);
119 const vfloat<N> V = select(left,v,vfloat<N>(1.0f)-v);
120 const vfloat<N> W = 1.0f-U-V;
121
122 if (P) {
123 mem<vfloat<N>>::storeu(valid,P+i,madd(W,Q0,madd(U,Q1,V*Q2)));
124 }
125 if (dPdu) {
126 assert(dPdu); mem<vfloat<N>>::storeu(valid,dPdu+i,select(left,Q1-Q0,Q0-Q1)*rcp_grid_width);
127 assert(dPdv); mem<vfloat<N>>::storeu(valid,dPdv+i,select(left,Q2-Q0,Q0-Q2)*rcp_grid_height);
128 }
129 if (ddPdudu) {
130 assert(ddPdudu); mem<vfloat<N>>::storeu(valid,ddPdudu+i,vfloat<N>(zero));
131 assert(ddPdvdv); mem<vfloat<N>>::storeu(valid,ddPdvdv+i,vfloat<N>(zero));
132 assert(ddPdudv); mem<vfloat<N>>::storeu(valid,ddPdudv+i,vfloat<N>(zero));
133 }
134 }
135 }
136
137 void addElementsToCount (GeometryCounts & counts) const;
138
139 __forceinline unsigned int getNumSubGrids(const size_t gridID)
140 {
141 const Grid &g = grid(i: gridID);
142 return max(a: (unsigned int)1,b: ((unsigned int)g.resX >> 1) * ((unsigned int)g.resY >> 1));
143 }
144
145 /*! get fast access to first vertex buffer */
146 __forceinline float * getCompactVertexArray () const {
147 return (float*) vertices0.getPtr();
148 }
149
150 public:
151
152 /*! returns number of vertices */
153 __forceinline size_t numVertices() const {
154 return vertices[0].size();
155 }
156
157 /*! returns i'th grid*/
158 __forceinline const Grid& grid(size_t i) const {
159 return grids[i];
160 }
161
162 /*! returns i'th vertex of the first time step */
163 __forceinline const Vec3fa vertex(size_t i) const { // FIXME: check if this does a unaligned load
164 return vertices0[i];
165 }
166
167 /*! returns i'th vertex of the first time step */
168 __forceinline const char* vertexPtr(size_t i) const {
169 return vertices0.getPtr(i);
170 }
171
172 /*! returns i'th vertex of itime'th timestep */
173 __forceinline const Vec3fa vertex(size_t i, size_t itime) const {
174 return vertices[itime][i];
175 }
176
177 /*! returns i'th vertex of itime'th timestep */
178 __forceinline const char* vertexPtr(size_t i, size_t itime) const {
179 return vertices[itime].getPtr(i);
180 }
181
182 /*! returns i'th vertex of the first timestep */
183 __forceinline size_t grid_vertex_index(const Grid& g, size_t x, size_t y) const {
184 assert(x < (size_t)g.resX);
185 assert(y < (size_t)g.resY);
186 return g.startVtxID + x + y * g.lineVtxOffset;
187 }
188
189 /*! returns i'th vertex of the first timestep */
190 __forceinline const Vec3fa grid_vertex(const Grid& g, size_t x, size_t y) const {
191 const size_t index = grid_vertex_index(g,x,y);
192 return vertex(i: index);
193 }
194
195 /*! returns i'th vertex of the itime'th timestep */
196 __forceinline const Vec3fa grid_vertex(const Grid& g, size_t x, size_t y, size_t itime) const {
197 const size_t index = grid_vertex_index(g,x,y);
198 return vertex(i: index,itime);
199 }
200
201 /*! calculates the build bounds of the i'th primitive, if it's valid */
202 __forceinline bool buildBounds(const Grid& g, size_t sx, size_t sy, BBox3fa& bbox) const
203 {
204 BBox3fa b(empty);
205 for (size_t t=0; t<numTimeSteps; t++)
206 {
207 for (size_t y=sy;y<min(a: sy+3,b: (size_t)g.resY);y++)
208 for (size_t x=sx;x<min(a: sx+3,b: (size_t)g.resX);x++)
209 {
210 const Vec3fa v = grid_vertex(g,x,y,itime: t);
211 if (unlikely(!isvalid(v))) return false;
212 b.extend(other: v);
213 }
214 }
215
216 bbox = b;
217 return true;
218 }
219
220 /*! calculates the build bounds of the i'th primitive at the itime'th time segment, if it's valid */
221 __forceinline bool buildBounds(const Grid& g, size_t sx, size_t sy, size_t itime, BBox3fa& bbox) const
222 {
223 assert(itime < numTimeSteps);
224 BBox3fa b0(empty);
225 for (size_t y=sy;y<min(a: sy+3,b: (size_t)g.resY);y++)
226 for (size_t x=sx;x<min(a: sx+3,b: (size_t)g.resX);x++)
227 {
228 const Vec3fa v = grid_vertex(g,x,y,itime);
229 if (unlikely(!isvalid(v))) return false;
230 b0.extend(other: v);
231 }
232
233 /* use bounds of first time step in builder */
234 bbox = b0;
235 return true;
236 }
237
238 __forceinline bool valid(size_t gridID, size_t itime=0) const {
239 return valid(gridID, itime_range: make_range(begin: itime, end: itime));
240 }
241
242 /*! check if the i'th primitive is valid between the specified time range */
243 __forceinline bool valid(size_t gridID, const range<size_t>& itime_range) const
244 {
245 if (unlikely(gridID >= grids.size())) return false;
246 const Grid &g = grid(i: gridID);
247 if (unlikely(g.startVtxID + 0 >= vertices0.size())) return false;
248 if (unlikely(g.startVtxID + (g.resY-1)*g.lineVtxOffset + g.resX-1 >= vertices0.size())) return false;
249
250 for (size_t y=0;y<g.resY;y++)
251 for (size_t x=0;x<g.resX;x++)
252 for (size_t itime = itime_range.begin(); itime <= itime_range.end(); itime++)
253 if (!isvalid(v: grid_vertex(g,x,y,itime))) return false;
254 return true;
255 }
256
257
258 __forceinline BBox3fa bounds(const Grid& g, size_t sx, size_t sy, size_t itime) const
259 {
260 BBox3fa box(empty);
261 buildBounds(g,sx,sy,itime,bbox&: box);
262 return box;
263 }
264
265 __forceinline LBBox3fa linearBounds(const Grid& g, size_t sx, size_t sy, size_t itime) const {
266 BBox3fa bounds0, bounds1;
267 buildBounds(g,sx,sy,itime: itime+0,bbox&: bounds0);
268 buildBounds(g,sx,sy,itime: itime+1,bbox&: bounds1);
269 return LBBox3fa(bounds0,bounds1);
270 }
271
272 /*! calculates the linear bounds of the i'th primitive for the specified time range */
273 __forceinline LBBox3fa linearBounds(const Grid& g, size_t sx, size_t sy, const BBox1f& dt) const {
274 return LBBox3fa([&] (size_t itime) { return bounds(g,sx,sy,itime); }, dt, time_range, fnumTimeSegments);
275 }
276
277 public:
278 BufferView<Grid> grids; //!< array of triangles
279 BufferView<Vec3fa> vertices0; //!< fast access to first vertex buffer
280 vector<BufferView<Vec3fa>> vertices; //!< vertex array for each timestep
281 vector<RawBufferView> vertexAttribs; //!< vertex attributes
282 };
283
284 namespace isa
285 {
286 struct GridMeshISA : public GridMesh
287 {
288 GridMeshISA (Device* device)
289 : GridMesh(device) {}
290 };
291 }
292
293 DECLARE_ISA_FUNCTION(GridMesh*, createGridMesh, Device*);
294}
295

source code of qtquick3d/src/3rdparty/embree/kernels/common/scene_grid_mesh.h