private static Vector4 MaxDotProductPlaneAABB(ref BoxMinMaxSoA Box, Vector4 Plane)
{
return(Vector4.Max(Box.MinX * Plane.x, Box.MaxX * Plane.x) +
Vector4.Max(Box.MinY * Plane.y, Box.MaxY * Plane.y) +
Vector4.Max(Box.MinZ * Plane.z, Box.MaxZ * Plane.z) +
new Vector4(Plane.w, Plane.w, Plane.w, Plane.w));
}
private static Vector4 FrustumOutsideAABB(ref BoxMinMaxSoA Box, Vector3 FrustumAABBMin, Vector3 FrustumAABBMax)
{
var r0 = new Vector4(FrustumAABBMax.x, FrustumAABBMax.x, FrustumAABBMax.x, FrustumAABBMax.x) - Box.MinX;
var r1 = new Vector4(FrustumAABBMax.y, FrustumAABBMax.y, FrustumAABBMax.y, FrustumAABBMax.y) - Box.MinY;
var r2 = new Vector4(FrustumAABBMax.z, FrustumAABBMax.z, FrustumAABBMax.z, FrustumAABBMax.z) - Box.MinZ;
var r3 = Box.MaxX - new Vector4(FrustumAABBMin.x, FrustumAABBMin.x, FrustumAABBMin.x, FrustumAABBMin.x);
var r4 = Box.MaxY - new Vector4(FrustumAABBMin.y, FrustumAABBMin.y, FrustumAABBMin.y, FrustumAABBMin.y);
var r5 = Box.MaxZ - new Vector4(FrustumAABBMin.z, FrustumAABBMin.z, FrustumAABBMin.z, FrustumAABBMin.z);
return(Vector4.Min(Vector4.Min(Vector4.Min(r0, r1), Vector4.Min(r2, r3)), Vector4.Min(r4, r5)));
}
static private void CullBoxesAoSoA_Default(
ref byte[] OutVisibilityMask,
ref Vector4[] InBoxesMinMaxAoSoA,
ref Vector4[] InFrustumData,
Vector3 FrustumAABBMax,
Vector3 FrustumAABBMin,
bool TestFrustumCorners)
{
int NumSoAPackets = InBoxesMinMaxAoSoA.Length / 6;
for (int i = 0; i < NumSoAPackets; ++i)
{
var BoxMinMax = new BoxMinMaxSoA(ref InBoxesMinMaxAoSoA, i);
var DotsL = MaxDotProductPlaneAABB(ref BoxMinMax, InFrustumData[0]);
var DotsR = MaxDotProductPlaneAABB(ref BoxMinMax, InFrustumData[1]);
var DotsT = MaxDotProductPlaneAABB(ref BoxMinMax, InFrustumData[2]);
var DotsB = MaxDotProductPlaneAABB(ref BoxMinMax, InFrustumData[3]);
var DotsN = MaxDotProductPlaneAABB(ref BoxMinMax, InFrustumData[4]);
var DotsF = MaxDotProductPlaneAABB(ref BoxMinMax, InFrustumData[5]);
var R = Vector4.Min(Vector4.Min(DotsL, DotsR), Vector4.Min(Vector4.Min(DotsT, DotsB), Vector4.Min(DotsF, DotsN)));
if (TestFrustumCorners)
{
R = Vector4.Min(R, FrustumOutsideAABB(ref BoxMinMax, FrustumAABBMin, FrustumAABBMax));
}
int Mask = (R.w < 0.0f ? 0x8 : 0x0)
| (R.z < 0.0f ? 0x4 : 0x0)
| (R.y < 0.0f ? 0x2 : 0x0)
| (R.x < 0.0f ? 0x1 : 0x0);
// init mask when index is even, update mask when it's odd
if ((i & 0x1) == 0)
{
OutVisibilityMask[i >> 1] = (byte)Mask;
}
else
{
OutVisibilityMask[i >> 1] |= (byte)(Mask << 4);
}
}
}