//[/GLdescription]
//[LockPositions]
void LockPos(Del f)
{
CUDAInterop.cuSafeCall(CUDAInterop.cuGraphicsResourceSetMapFlags(_resources[0],
(uint)CUDAInterop.CUgraphicsMapResourceFlags_enum.CU_GRAPHICS_MAP_RESOURCE_FLAGS_READ_ONLY));
CUDAInterop.cuSafeCall(CUDAInterop.cuGraphicsResourceSetMapFlags(_resources[1],
(uint)CUDAInterop.CUgraphicsMapResourceFlags_enum.CU_GRAPHICS_MAP_RESOURCE_FLAGS_WRITE_DISCARD));
CUDAInterop.cuSafeCall(CUDAInterop.cuGraphicsMapResourcesEx(2u, _resources, IntPtr.Zero));
var bytes = IntPtr.Zero;
var handle0 = IntPtr.Zero;
var handle1 = IntPtr.Zero;
unsafe
{
CUDAInterop.cuSafeCall(CUDAInterop.cuGraphicsResourceGetMappedPointer(&handle0, &bytes,
_resources[0]));
CUDAInterop.cuSafeCall(CUDAInterop.cuGraphicsResourceGetMappedPointer(&handle1, &bytes,
_resources[1]));
}
var pos0 = new deviceptr <float4>(handle0);
var pos1 = new deviceptr <float4>(handle1);
try
{
f(pos0, pos1);
}
finally
{
CUDAInterop.cuSafeCall(CUDAInterop.cuGraphicsUnmapResourcesEx(2u, _resources, IntPtr.Zero));
}
}
unsafe public void Update(IntPtr vbRes, float time)
{
// 1. map resource to cuda space, means lock to cuda space
var vbRes1 = vbRes;
CUDAInterop.cuSafeCall(CUDAInterop.cuGraphicsMapResources(1, &vbRes1, IntPtr.Zero));
// 2. get memory pointer from mapped resource
var vbPtr = IntPtr.Zero;
var vbSize = IntPtr.Zero;
CUDAInterop.cuSafeCall(CUDAInterop.cuGraphicsResourceGetMappedPointer(&vbPtr, &vbSize, vbRes1));
// 3. create device pointer, and run the kernel
var pos = new deviceptr <float4>(vbPtr);
GPULaunch(Kernel, LaunchParam, pos, time);
// 4. unmap resource, means unlock, so that DirectX can then use it again
CUDAInterop.cuSafeCall(CUDAInterop.cuGraphicsUnmapResources(1u, &vbRes1, IntPtr.Zero));
}