/// <summary>
/// This function returns the EDID data for the specified GPU handle and connection bit mask.
/// outputId should have exactly 1 bit set to indicate a single display.
/// </summary>
/// <param name="gpuHandle">Physical GPU handle to check outputs</param>
/// <param name="outputId">Output identification</param>
/// <param name="offset">EDID offset</param>
/// <param name="readIdentification">EDID read identification for multi part read, or zero for first run</param>
/// <returns>Whole or a part of the EDID data</returns>
/// <exception cref="NVIDIANotSupportedException">This operation is not supported.</exception>
/// <exception cref="NVIDIAApiException">
/// Status.InvalidArgument: gpuHandle or edid is invalid, outputId has 0 or > 1 bits
/// set
/// </exception>
/// <exception cref="NVIDIAApiException">Status.NvidiaDeviceNotFound: No NVIDIA GPU driving a display was found.</exception>
/// <exception cref="NVIDIAApiException">Status.ExpectedPhysicalGPUHandle: gpuHandle was not a physical GPU handle.</exception>
/// <exception cref="NVIDIAApiException">Status.DataNotFound: The requested display does not contain an EDID.</exception>
/// <exception cref="Exception">A delegate callback throws an exception.</exception>
// ReSharper disable once TooManyArguments
public static EDIDV3 GetEDID(
PhysicalGPUHandle gpuHandle,
OutputId outputId,
int offset,
int readIdentification = 0)
{
var gpuGetEDID = DelegateFactory.GetDelegate <Delegates.GPU.NvAPI_GPU_GetEDID>();
if (!gpuGetEDID.Accepts().Contains(typeof(EDIDV3)))
{
throw new NVIDIANotSupportedException("This operation is not supported.");
}
var instance = EDIDV3.CreateWithOffset((uint)readIdentification, (uint)offset);
using (var edidReference = ValueTypeReference.FromValueType(instance))
{
var status = gpuGetEDID(gpuHandle, outputId, edidReference);
if (status != Status.Ok)
{
throw new NVIDIAApiException(status);
}
return(edidReference.ToValueType <EDIDV3>().GetValueOrDefault());
}
}
private void WriteEDIDData(uint displayOutputId, byte[] edidData)
{
try
{
for (var offset = 0; offset < edidData.Length; offset += EDIDV3.MaxDataSize)
{
var array = new byte[Math.Min(EDIDV3.MaxDataSize, edidData.Length - offset)];
Array.Copy(edidData, offset, array, 0, array.Length);
var instance = EDIDV3.CreateWithData(0, (uint)offset, array, edidData.Length);
GPUApi.SetEDID(Handle, displayOutputId, instance);
}
return;
}
catch (NVIDIAApiException ex)
{
if (ex.Status != Status.IncompatibleStructureVersion)
{
throw;
}
}
catch (NVIDIANotSupportedException)
{
// ignore
}
try
{
for (var offset = 0; offset < edidData.Length; offset += EDIDV2.MaxDataSize)
{
var array = new byte[Math.Min(EDIDV2.MaxDataSize, edidData.Length - offset)];
Array.Copy(edidData, offset, array, 0, array.Length);
GPUApi.SetEDID(Handle, displayOutputId, EDIDV2.CreateWithData(array, edidData.Length));
}
return;
}
catch (NVIDIAApiException ex)
{
if (ex.Status != Status.IncompatibleStructureVersion)
{
throw;
}
}
catch (NVIDIANotSupportedException)
{
// ignore
}
GPUApi.SetEDID(Handle, displayOutputId, EDIDV1.CreateWithData(edidData));
}
