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arjansingh00

DX11 Cannot enable 4X MSAA Anti-Aliasing DirectX11

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I am currently learning how to use DirectX11 but I am unable to use 4X MSAA. Here is my code (Since I'm just learning I haven't used any headers or classes, sorry for the messy code)

#define SCREEN_WIDTH 800
#define SCREEN_HEIGHT 600

// include the basic windows header files and the Direct3D header files
#include <windows.h>
#include <windowsx.h>
#include <d3d11.h>
#include <d3dx11.h>
#include <d3dx10.h>
#include <DirectXMath.h>

using namespace DirectX;

// include the Direct3D Library file
#pragma comment (lib, "d3d11.lib")
#pragma comment (lib, "d3dx11.lib")
#pragma comment (lib, "d3dx10.lib")

// global declarations
IDXGISwapChain *swapchain;             // the pointer to the swap chain interface
ID3D11Device *dev;                     // the pointer to our Direct3D device interface
ID3D11DeviceContext *devcon;           // the pointer to our Direct3D device context
ID3D11RenderTargetView *backbuffer;    // the pointer to our back buffer
ID3D11Buffer* triangleVertBuffer;
ID3D11VertexShader* VS;
ID3D11PixelShader* PS;
ID3D10Blob* VS_Buffer;
ID3D10Blob* PS_Buffer;
ID3D11InputLayout* vertLayout;

									   // function prototypes
void InitD3D(HWND hWnd);    // sets up and initializes Direct3D
void RenderFrame(void);     // renders a single frame
void CleanD3D(void);        // closes Direct3D and releases memory
void InitScene(void);

							// the WindowProc function prototype
LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);


// the entry point for any Windows program
int WINAPI WinMain(HINSTANCE hInstance,
	HINSTANCE hPrevInstance,
	LPSTR lpCmdLine,
	int nCmdShow)
{
	HWND hWnd;
	WNDCLASSEX wc;

	ZeroMemory(&wc, sizeof(WNDCLASSEX));

	wc.cbSize = sizeof(WNDCLASSEX);
	wc.style = CS_HREDRAW | CS_VREDRAW;
	wc.lpfnWndProc = WindowProc;
	wc.hInstance = hInstance;
	wc.hCursor = LoadCursor(NULL, IDC_ARROW);
	wc.hbrBackground = (HBRUSH)COLOR_WINDOW;
	wc.lpszClassName = L"WindowClass";

	RegisterClassEx(&wc);

	RECT wr = { 0, 0, 800, 600 };
	AdjustWindowRect(&wr, WS_OVERLAPPEDWINDOW, FALSE);

	hWnd = CreateWindowEx(NULL,
		L"WindowClass",
		L"Eagle Engine (Alpha)",
		WS_OVERLAPPEDWINDOW,
		SCREEN_WIDTH,
		SCREEN_HEIGHT,
		wr.right - wr.left,
		wr.bottom - wr.top,
		NULL,
		NULL,
		hInstance,
		NULL);

	ShowWindow(hWnd, nCmdShow);

	// set up and initialize Direct3D
	InitD3D(hWnd);

	// enter the main loop:

	MSG msg;

	while (TRUE)
	{
		if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
		{
			TranslateMessage(&msg);
			DispatchMessage(&msg);

			if (msg.message == WM_QUIT)
				break;
		}

		RenderFrame();
	}

	// clean up DirectX and COM
	CleanD3D();

	return msg.wParam;
}


// this is the main message handler for the program
LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	switch (message)
	{
	case WM_DESTROY:
	{
		PostQuitMessage(0);
		return 0;
	} break;
	}

	return DefWindowProc(hWnd, message, wParam, lParam);
}


// this function initializes and prepares Direct3D for use
void InitD3D(HWND hWnd)
{
	// create a struct to hold information about the swap chain
	DXGI_SWAP_CHAIN_DESC scd;

	// clear out the struct for use
	ZeroMemory(&scd, sizeof(DXGI_SWAP_CHAIN_DESC));

	// fill the swap chain description struct
	scd.BufferCount = 2;                                    // one back buffer
	scd.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;     // use 32-bit color
	scd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;      // how swap chain is to be used
	scd.OutputWindow = hWnd;                                // the window to be used
	scd.SampleDesc.Count = 4;                               // how many multisamples
	scd.Windowed = TRUE;                                    // windowed/full-screen mode
															// create a device, device context and swap chain using the information in the scd struct

	HRESULT hr = E_FAIL;
	hr = D3D11CreateDeviceAndSwapChain(NULL,
		D3D_DRIVER_TYPE_HARDWARE,
		NULL,
		NULL,
		NULL,
		NULL,
		D3D11_SDK_VERSION,
		&scd,
		&swapchain,
		&dev,
		NULL,
		&devcon);

	// get the address of the back buffer
	ID3D11Texture2D *pBackBuffer;
	swapchain->GetBuffer(0, __uuidof(ID3D11Texture2D), (LPVOID*)&pBackBuffer);

	// use the back buffer address to create the render target
	dev->CreateRenderTargetView(pBackBuffer, NULL, &backbuffer);
	pBackBuffer->Release();

	// set the render target as the back buffer
	devcon->OMSetRenderTargets(1, &backbuffer, NULL);

	ID3D11Texture2D* pDepthStencil = NULL;
	D3D11_TEXTURE2D_DESC descDepth;
	descDepth.Width = SCREEN_WIDTH;
	descDepth.Height = SCREEN_HEIGHT;
	descDepth.MipLevels = 1;
	descDepth.ArraySize = 1;
	descDepth.Format = DXGI_FORMAT_R32_TYPELESS;
	descDepth.SampleDesc.Count = 4;
	descDepth.SampleDesc.Quality = 0;
	descDepth.Usage = D3D11_USAGE_DEFAULT;
	descDepth.BindFlags = D3D11_BIND_DEPTH_STENCIL | D3D11_BIND_SHADER_RESOURCE;
	descDepth.CPUAccessFlags = 0;
	descDepth.MiscFlags = 0;
	hr = dev->CreateTexture2D(&descDepth, NULL, &pDepthStencil);

	D3D11_DEPTH_STENCIL_VIEW_DESC descDSV;
	descDSV.Format = DXGI_FORMAT_D32_FLOAT_S8X24_UINT;
	descDSV.ViewDimension = D3D11_DSV_DIMENSION_TEXTURE2D;
	descDSV.Texture2D.MipSlice = 0;

	// Create the depth stencil view
	ID3D11DepthStencilView* pDSV;
	hr = dev->CreateDepthStencilView(pDepthStencil, // Depth stencil texture
		&descDSV, // Depth stencil desc
		&pDSV);  // [out] Depth stencil view

	devcon->OMSetRenderTargets(1, &backbuffer, pDSV);


	// Set the viewport
	D3D11_VIEWPORT viewport;
	ZeroMemory(&viewport, sizeof(D3D11_VIEWPORT));

	viewport.TopLeftX = 0;
	viewport.TopLeftY = 0;
	viewport.Width = SCREEN_WIDTH;
	viewport.Height = SCREEN_HEIGHT;
	viewport.MinDepth = 0.0f;
	viewport.MaxDepth = 1.0f;

	devcon->RSSetViewports(1, &viewport);
	InitScene();
}

// this is the function used to render a single frame
void RenderFrame(void)
{
	// clear the back buffer to a deep blue
	devcon->Draw(3, 0);
	// switch the back buffer and the front buffer
	swapchain->Present(0, 0);
}


// this is the function that cleans up Direct3D and COM
void CleanD3D(void)
{
	// close and release all existing COM objects
	swapchain->Release();
	dev->Release();
	backbuffer->Release();
	devcon->Release();
	triangleVertBuffer->Release();
	VS->Release();
	PS->Release();
	VS_Buffer->Release();
	PS_Buffer->Release();
	vertLayout->Release();
}

struct Vertex 
{
	Vertex() {}
	Vertex(float x, float y, float z)
		: pos(x, y, z) {}
	XMFLOAT3 pos;
};

D3D11_INPUT_ELEMENT_DESC layout[] =
{
	{ "POSITION", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 0, D3D11_INPUT_PER_VERTEX_DATA, 0 },
};
UINT numElements = ARRAYSIZE(layout);

void InitScene()
{
	//Compile Shaders from shader file
	D3DX11CompileFromFile(L"Effects.fx", 0, 0, "VS", "vs_4_0", 0, 0, 0, &VS_Buffer, 0, 0);
	D3DX11CompileFromFile(L"Effects.fx", 0, 0, "PS", "ps_4_0", 0, 0, 0, &PS_Buffer, 0, 0);

	//Create the Shader Objects
	dev->CreateVertexShader(VS_Buffer->GetBufferPointer(), VS_Buffer->GetBufferSize(), NULL, &VS);
	dev->CreatePixelShader(PS_Buffer->GetBufferPointer(), PS_Buffer->GetBufferSize(), NULL, &PS);

	//Set Vertex and Pixel Shaders
	devcon->VSSetShader(VS, 0, 0);
	devcon->PSSetShader(PS, 0, 0);

	//Create the vertex buffer
	Vertex v[] =
	{
		Vertex(0.0f, 0.5f, 0.5f),
		Vertex(0.5f, -0.5f, 0.5f),
		Vertex(-0.5f, -0.5f, 0.5f),
	};

	D3D11_BUFFER_DESC vertexBufferDesc;
	ZeroMemory(&vertexBufferDesc, sizeof(vertexBufferDesc));

	vertexBufferDesc.Usage = D3D11_USAGE_DEFAULT;
	vertexBufferDesc.ByteWidth = sizeof(Vertex) * 3;
	vertexBufferDesc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
	vertexBufferDesc.CPUAccessFlags = 0;
	vertexBufferDesc.MiscFlags = 0;

	D3D11_SUBRESOURCE_DATA vertexBufferData;

	ZeroMemory(&vertexBufferData, sizeof(vertexBufferData));
	vertexBufferData.pSysMem = v;
	dev->CreateBuffer(&vertexBufferDesc, &vertexBufferData, &triangleVertBuffer);

	//Set the vertex buffer
	UINT stride = sizeof(Vertex);
	UINT offset = 0;
	devcon->IASetVertexBuffers(0, 1, &triangleVertBuffer, &stride, &offset);

	//Create the Input Layout
	dev->CreateInputLayout(layout, numElements, VS_Buffer->GetBufferPointer(),
		VS_Buffer->GetBufferSize(), &vertLayout);

	//Set the Input Layout
	devcon->IASetInputLayout(vertLayout);

	//Set Primitive Topology
	devcon->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
}

I've attached a photo of what I get when I compile the above code. Notice the jagged edges 

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I can't remember exactly, but try changing:

descDSV.ViewDimension = D3D11_DSV_DIMENSION_TEXTURE2D;

to

descDSV.ViewDimension = D3D11_DSV_DIMENSION_TEXTURE2DMS;

 

Note the 'MS' suffix

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Pass the D3D11_CREATE_DEVICE_DEBUG flag when creating your D3D11 device: it will cause the runtime to output warning and error messages when you do something wrong with the API. It's a good idea to always use that for your debugging builds, and fix any issues that it brings up.

 

If you'd like, you can also tell the runtime to break into the debugger right when an error occurs so that you know exactly which line of code is causing the problem:

 

ID3D11InfoQueue* infoQueue = nullptr;
device->QueryInterface(__uuidof(ID3D11InfoQueue), reinterpret_cast<void**>(&infoQueue));
if(infoQueue)
{
    infoQueue->SetBreakOnSeverity(D3D11_MESSAGE_SEVERITY_WARNING, TRUE);
    infoQueue->SetBreakOnSeverity(D3D11_MESSAGE_SEVERITY_ERROR, TRUE);
    infoQueue->Release();
    infoQueue = nullptr;
}

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