Upgrade Embree to the latest official release.

Since Embree v3.13.0 supports AARCH64, switch back to the
official repo instead of using Embree-aarch64.

`thirdparty/embree/patches/godot-changes.patch` should now contain
an accurate diff of the changes done to the library.

1 files changed, 138 insertions, 0 deletions

diff --git a/thirdparty/embree/kernels/common/primref.h b/thirdparty/embree/kernels/common/primref.h
new file mode 100644
index 0000000000..d61763487b
--- /dev/null
+++ b/thirdparty/embree/kernels/common/primref.h
@@ -0,0 +1,138 @@
+// Copyright 2009-2021 Intel Corporation
+// SPDX-License-Identifier: Apache-2.0
+
+#pragma once
+
+#include "default.h"
+
+namespace embree
+{
+  /*! A primitive reference stores the bounds of the primitive and its ID. */
+  struct __aligned(32) PrimRef 
+  {
+    __forceinline PrimRef () {}
+
+#if defined(__AVX__)
+    __forceinline PrimRef(const PrimRef& v) { 
+      vfloat8::store((float*)this,vfloat8::load((float*)&v));
+    }
+    __forceinline PrimRef& operator=(const PrimRef& v) { 
+      vfloat8::store((float*)this,vfloat8::load((float*)&v)); return *this;
+    }
+#endif
+
+    __forceinline PrimRef (const BBox3fa& bounds, unsigned int geomID, unsigned int primID) 
+    {
+      lower = Vec3fx(bounds.lower, geomID);
+      upper = Vec3fx(bounds.upper, primID);
+    }
+
+    __forceinline PrimRef (const BBox3fa& bounds, size_t id) 
+    {
+#if defined(__64BIT__)
+      lower = Vec3fx(bounds.lower, (unsigned)(id & 0xFFFFFFFF));
+      upper = Vec3fx(bounds.upper, (unsigned)((id >> 32) & 0xFFFFFFFF));
+#else
+      lower = Vec3fx(bounds.lower, (unsigned)id);
+      upper = Vec3fx(bounds.upper, (unsigned)0);
+#endif
+    }
+
+    /*! calculates twice the center of the primitive */
+    __forceinline const Vec3fa center2() const {
+      return lower+upper;
+    }
+    
+    /*! return the bounding box of the primitive */
+    __forceinline const BBox3fa bounds() const {
+      return BBox3fa(lower,upper);
+    }
+
+    /*! size for bin heuristic is 1 */
+    __forceinline unsigned size() const { 
+      return 1;
+    }
+
+    /*! returns bounds and centroid used for binning */
+    __forceinline void binBoundsAndCenter(BBox3fa& bounds_o, Vec3fa& center_o) const 
+    {
+      bounds_o = bounds();
+      center_o = embree::center2(bounds_o);
+    }
+
+    __forceinline unsigned& geomIDref() {  // FIXME: remove !!!!!!!
+      return lower.u;
+    }
+    __forceinline unsigned& primIDref() {  // FIXME: remove !!!!!!!
+      return upper.u;
+    }
+    
+    /*! returns the geometry ID */
+    __forceinline unsigned geomID() const { 
+      return lower.a;
+    }
+
+    /*! returns the primitive ID */
+    __forceinline unsigned primID() const { 
+      return upper.a;
+    }
+
+    /*! returns an size_t sized ID */
+    __forceinline size_t ID() const { 
+#if defined(__64BIT__)
+      return size_t(lower.u) + (size_t(upper.u) << 32);
+#else
+      return size_t(lower.u);
+#endif
+    }
+
+    /*! special function for operator< */
+    __forceinline uint64_t ID64() const {
+      return (((uint64_t)primID()) << 32) + (uint64_t)geomID();
+    }
+    
+    /*! allows sorting the primrefs by ID */
+    friend __forceinline bool operator<(const PrimRef& p0, const PrimRef& p1) {
+      return p0.ID64() < p1.ID64();
+    }
+
+    /*! Outputs primitive reference to a stream. */
+    friend __forceinline embree_ostream operator<<(embree_ostream cout, const PrimRef& ref) {
+      return cout << "{ lower = " << ref.lower << ", upper = " << ref.upper << ", geomID = " << ref.geomID() << ", primID = " << ref.primID() << " }";
+    }
+
+  public:
+    Vec3fx lower;     //!< lower bounds and geomID
+    Vec3fx upper;     //!< upper bounds and primID
+  };
+
+  /*! fast exchange for PrimRefs */
+  __forceinline void xchg(PrimRef& a, PrimRef& b)
+  {
+#if defined(__AVX__)
+    const vfloat8 aa = vfloat8::load((float*)&a);
+    const vfloat8 bb = vfloat8::load((float*)&b);
+    vfloat8::store((float*)&a,bb);
+    vfloat8::store((float*)&b,aa);
+#else
+    std::swap(a,b);
+#endif
+  }
+
+  /************************************************************************************/
+  /************************************************************************************/
+  /************************************************************************************/
+  /************************************************************************************/
+  
+  struct SubGridBuildData {
+    unsigned short sx,sy;
+    unsigned int primID;
+    
+    __forceinline SubGridBuildData() {};
+    __forceinline SubGridBuildData(const unsigned int sx, const unsigned int sy, const unsigned int primID) : sx(sx), sy(sy), primID(primID) {};
+    
+    __forceinline size_t x() const { return (size_t)sx & 0x7fff; }
+    __forceinline size_t y() const { return (size_t)sy & 0x7fff; }
+    
+  };
+}