[IDEA] Introduce PIX bindings

[john-h-k]

Idea

Introduce PIX bindings for this repo

Rationale

PIX is the officially recommended debugger for DX and support is useful

Proposed API

// CPU only
void PIXBeginEvent(ulong color, ushort* formatString, __arglist);

// GPU and CPU
void PIXBeginEvent(ID3D12CommandList* commandList, ulong color, ushort* formatString, __arglist);
void PIXBeginEvent(ID3D12CommandQueue* commandQueue, ulong color, ushort* formatString, __arglist);

// CPU only
void PIXEndEvent();
        
// GPU and CPU
void PIXEndEvent(ID3D12CommandList* commandList);
void PIXEndEvent(ID3D12CommandQueue* commandQueue);

// CPU
void PIXSetMarker(ulong color, ushort* formatString, __arglist);

// GPU and CPU
void PIXSetMarker(ID3D12GraphicsCommandList* commandList, ulong color, ushort* formatString, __arglist);
void PIXSetMarker(ID3D12CommandQueue* commandQueue, ulong color, ushort* formatString, __arglist);

// Could be implemented with a IDisposable struct and a using

PIXScopedEvent(ulong color, ushort*  formatString, __arglist);
PIXScopedEvent(ID3D12GraphicsCommandList* commandList, ulong color, ushort*  formatString, __arglist);
PIXScopedEvent(ID3D12CommandQueue* commandQueue, ulong color, ushort* formatString, __arglist);

void PIXReportCounter(ushort* name, float value);

void PIXNotifyWakeFromFenceSignal(HANDLE event);

// Returns a color for a PIX event or marker from the specified red, green and blue values
int PIX_COLOR(byte r, byte g, byte b);

// Returns an arbitrary color value for the given index.
// PIX allocates a unique color for each index.
uint PIX_COLOR_INDEX(byte i);

Drawbacks

I am not sure about the copyright status of PIX, and obviously while calling the native functions is fine, porting the header ones might be an issue