// Get a single value
func (b *Array) Get(comp, x, y, z int) float64 {
b.checkBounds(comp, x, y, z)
var value float64
acomp := b.Comp[comp]
index := acomp.indexOf(x, y, z)
cu.MemcpyDtoH(cu.HostPtr(unsafe.Pointer(&value)),
cu.DevicePtr(offset(uintptr(acomp.pointer), SIZEOF_FLOAT*index)),
1*SIZEOF_FLOAT)
return value
}
// Copy from device array to host array.
func (src *Array) CopyToHost(dst *host.Array) {
CheckSize(dst.Size4D, src.size4D)
partPlaneN := src.partSize[1] * src.partSize[2] // floats per YZ plane per GPU
planeN := src.size3D[1] * src.size3D[2] // total floats per YZ plane
NPlane := src.size4D[0] * src.size3D[0] // total YZ planes (NComp * X size)
partPlaneBytes := SIZEOF_FLOAT * int64(partPlaneN) // bytes per YZ plane per GPU
for i := 0; i < NPlane; i++ {
srcOffset := i * partPlaneN
srcPtr := ArrayOffset(uintptr(src.pointer), srcOffset)
dstOffset := i * planeN
cu.MemcpyDtoH(cu.HostPtr(&dst.List[dstOffset]), cu.DevicePtr(srcPtr), partPlaneBytes)
}
}