From 34b3e8f9e2ae076990ecf3b2827eff759ba2abf9 Mon Sep 17 00:00:00 2001
From: jfons <joan.fonssanchez@gmail.com>
Date: Tue, 20 Apr 2021 18:38:09 +0200
Subject: Add Embree-aarch64 thirdparty library

---
 .../kernels/common/scene_grid_mesh.h               | 215 +++++++++++++++++++++
 1 file changed, 215 insertions(+)
 create mode 100644 thirdparty/embree-aarch64/kernels/common/scene_grid_mesh.h

(limited to 'thirdparty/embree-aarch64/kernels/common/scene_grid_mesh.h')

diff --git a/thirdparty/embree-aarch64/kernels/common/scene_grid_mesh.h b/thirdparty/embree-aarch64/kernels/common/scene_grid_mesh.h
new file mode 100644
index 0000000000..c08658466a
--- /dev/null
+++ b/thirdparty/embree-aarch64/kernels/common/scene_grid_mesh.h
@@ -0,0 +1,215 @@
+// Copyright 2009-2020 Intel Corporation
+// SPDX-License-Identifier: Apache-2.0
+
+#pragma once
+
+#include "geometry.h"
+#include "buffer.h"
+
+namespace embree
+{
+  /*! Grid Mesh */
+  struct GridMesh : public Geometry
+  {
+    /*! type of this geometry */
+    static const Geometry::GTypeMask geom_type = Geometry::MTY_GRID_MESH;
+
+    /*! grid */
+    struct Grid 
+    {
+      unsigned int startVtxID;
+      unsigned int lineVtxOffset;
+      unsigned short resX,resY;
+
+      /* border flags due to 3x3 vertex pattern */
+      __forceinline unsigned int get3x3FlagsX(const unsigned int x) const
+      {
+        return (x + 2 >= (unsigned int)resX) ? (1<<15) : 0;
+      }
+
+      /* border flags due to 3x3 vertex pattern */
+      __forceinline unsigned int get3x3FlagsY(const unsigned int y) const
+      {
+        return (y + 2 >= (unsigned int)resY) ? (1<<15) : 0;
+      }
+
+      /*! outputs grid structure */
+      __forceinline friend embree_ostream operator<<(embree_ostream cout, const Grid& t) {
+        return cout << "Grid { startVtxID " << t.startVtxID << ", lineVtxOffset " << t.lineVtxOffset << ", resX " << t.resX << ", resY " << t.resY << " }";
+      }
+    };
+
+  public:
+
+    /*! grid mesh construction */
+    GridMesh (Device* device); 
+
+    /* geometry interface */
+  public:
+    void setMask(unsigned mask);
+    void setNumTimeSteps (unsigned int numTimeSteps);
+    void setVertexAttributeCount (unsigned int N);
+    void setBuffer(RTCBufferType type, unsigned int slot, RTCFormat format, const Ref<Buffer>& buffer, size_t offset, size_t stride, unsigned int num);
+    void* getBuffer(RTCBufferType type, unsigned int slot);
+    void updateBuffer(RTCBufferType type, unsigned int slot);
+    void commit();
+    bool verify();
+    void interpolate(const RTCInterpolateArguments* const args);
+    void addElementsToCount (GeometryCounts & counts) const;
+
+    __forceinline unsigned int getNumSubGrids(const size_t gridID)
+    {
+      const Grid &g = grid(gridID);
+      return max((unsigned int)1,((unsigned int)g.resX >> 1) * ((unsigned int)g.resY >> 1));
+    }
+
+    /*! get fast access to first vertex buffer */
+    __forceinline float * getCompactVertexArray () const {
+      return (float*) vertices0.getPtr();
+    }
+
+  public:
+
+    /*! returns number of vertices */
+    __forceinline size_t numVertices() const {
+      return vertices[0].size();
+    }
+    
+    /*! returns i'th grid*/
+    __forceinline const Grid& grid(size_t i) const {
+      return grids[i];
+    }
+
+    /*! returns i'th vertex of the first time step  */
+    __forceinline const Vec3fa vertex(size_t i) const { // FIXME: check if this does a unaligned load
+      return vertices0[i];
+    }
+
+    /*! returns i'th vertex of the first time step */
+    __forceinline const char* vertexPtr(size_t i) const {
+      return vertices0.getPtr(i);
+    }
+
+    /*! returns i'th vertex of itime'th timestep */
+    __forceinline const Vec3fa vertex(size_t i, size_t itime) const {
+      return vertices[itime][i];
+    }
+
+    /*! returns i'th vertex of itime'th timestep */
+    __forceinline const char* vertexPtr(size_t i, size_t itime) const {
+      return vertices[itime].getPtr(i);
+    }
+
+    /*! returns i'th vertex of the first timestep */
+    __forceinline size_t grid_vertex_index(const Grid& g, size_t x, size_t y) const {
+      assert(x < (size_t)g.resX);
+      assert(y < (size_t)g.resY);
+      return g.startVtxID + x + y * g.lineVtxOffset;
+    }
+    
+    /*! returns i'th vertex of the first timestep */
+    __forceinline const Vec3fa grid_vertex(const Grid& g, size_t x, size_t y) const {
+      const size_t index = grid_vertex_index(g,x,y);
+      return vertex(index);
+    }
+
+    /*! returns i'th vertex of the itime'th timestep */
+    __forceinline const Vec3fa grid_vertex(const Grid& g, size_t x, size_t y, size_t itime) const {
+      const size_t index = grid_vertex_index(g,x,y);
+      return vertex(index,itime);
+    }
+
+    /*! calculates the build bounds of the i'th primitive, if it's valid */
+    __forceinline bool buildBounds(const Grid& g, size_t sx, size_t sy, BBox3fa& bbox) const
+    {
+      BBox3fa b(empty);
+      for (size_t t=0; t<numTimeSteps; t++)
+      {
+        for (size_t y=sy;y<min(sy+3,(size_t)g.resY);y++)
+          for (size_t x=sx;x<min(sx+3,(size_t)g.resX);x++)
+          {
+            const Vec3fa v = grid_vertex(g,x,y,t);
+            if (unlikely(!isvalid(v))) return false;
+            b.extend(v);
+          }
+      }
+
+      bbox = b;
+      return true;
+    }
+
+    /*! calculates the build bounds of the i'th primitive at the itime'th time segment, if it's valid */
+    __forceinline bool buildBounds(const Grid& g, size_t sx, size_t sy, size_t itime, BBox3fa& bbox) const
+    {
+      assert(itime < numTimeSteps);
+      BBox3fa b0(empty);
+      for (size_t y=sy;y<min(sy+3,(size_t)g.resY);y++)
+        for (size_t x=sx;x<min(sx+3,(size_t)g.resX);x++)
+        {
+          const Vec3fa v = grid_vertex(g,x,y,itime);
+          if (unlikely(!isvalid(v))) return false;
+          b0.extend(v);
+        }
+
+      /* use bounds of first time step in builder */
+      bbox = b0;
+      return true;
+    }
+
+    __forceinline bool valid(size_t gridID, size_t itime=0) const {
+      return valid(gridID, make_range(itime, itime));
+    }
+
+    /*! check if the i'th primitive is valid between the specified time range */
+    __forceinline bool valid(size_t gridID, const range<size_t>& itime_range) const
+    {
+      if (unlikely(gridID >= grids.size())) return false;
+      const Grid &g = grid(gridID);
+      if (unlikely(g.startVtxID + 0                                     >= vertices0.size())) return false;
+      if (unlikely(g.startVtxID + (g.resY-1)*g.lineVtxOffset + g.resX-1 >= vertices0.size())) return false;
+
+      for (size_t y=0;y<g.resY;y++)
+        for (size_t x=0;x<g.resX;x++)
+          for (size_t itime = itime_range.begin(); itime <= itime_range.end(); itime++)
+            if (!isvalid(grid_vertex(g,x,y,itime))) return false;
+      return true;
+    }
+
+
+    __forceinline BBox3fa bounds(const Grid& g, size_t sx, size_t sy, size_t itime) const
+    {
+      BBox3fa box(empty);
+      buildBounds(g,sx,sy,itime,box);
+      return box;
+    }
+
+    __forceinline LBBox3fa linearBounds(const Grid& g, size_t sx, size_t sy, size_t itime) const {
+      BBox3fa bounds0, bounds1;
+      buildBounds(g,sx,sy,itime+0,bounds0);
+      buildBounds(g,sx,sy,itime+1,bounds1);
+      return LBBox3fa(bounds0,bounds1);
+    }
+
+    /*! calculates the linear bounds of the i'th primitive for the specified time range */
+    __forceinline LBBox3fa linearBounds(const Grid& g, size_t sx, size_t sy, const BBox1f& dt) const {
+      return LBBox3fa([&] (size_t itime) { return bounds(g,sx,sy,itime); }, dt, time_range, fnumTimeSegments);
+    }
+
+  public:
+    BufferView<Grid> grids;      //!< array of triangles
+    BufferView<Vec3fa> vertices0;        //!< fast access to first vertex buffer
+    vector<BufferView<Vec3fa>> vertices; //!< vertex array for each timestep
+    vector<RawBufferView> vertexAttribs; //!< vertex attributes
+  };
+
+  namespace isa
+  {
+    struct GridMeshISA : public GridMesh
+    {
+      GridMeshISA (Device* device)
+        : GridMesh(device) {}
+    };
+  }
+
+  DECLARE_ISA_FUNCTION(GridMesh*, createGridMesh, Device*);
+}
-- 
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