//filename d3dclass.cpp
#include "d3dclass.h"

D3DClass::D3DClass()
{
	m_swapChain = 0;
	m_device = 0;
	m_deviceContext = 0;
	m_renderTargetView = 0;
	m_depthStencilBuffer = 0;
	m_depthStencilState = 0;
	m_depthStencilView = 0;
	m_rasterState = 0;

	m_depthDisabledStencilState = 0;

	m_alphaDisableBlendingState = 0;
	m_alphaEnableBlendingState = 0;
}

D3DClass::D3DClass(const D3DClass& other)
{
}

D3DClass::~D3DClass()
{
}

bool D3DClass::Initialize(int screenWidth, int screenHeight, bool vsync, HWND hwnd, bool fullscreen,
	float screenDepth, float screenNear)
{

	HRESULT result;
	IDXGIFactory* factory;
	IDXGIAdapter* adapter;
	IDXGIOutput* adapterOutput;
	unsigned int numModes, i, numerator, denominator, stringLength;
	DXGI_MODE_DESC* displayModeList;
	DXGI_ADAPTER_DESC adapterDesc;
	int error;
	DXGI_SWAP_CHAIN_DESC swapChainDesc;
	D3D_FEATURE_LEVEL featureLevel;
	ID3D11Texture2D* backBufferPtr;
	D3D11_TEXTURE2D_DESC depthBufferDesc;
	D3D11_DEPTH_STENCIL_DESC depthStencilDesc;
	D3D11_DEPTH_STENCIL_VIEW_DESC depthStencilViewDesc;
	D3D11_RASTERIZER_DESC rasterDesc;
	D3D11_VIEWPORT viewport;
	float fieldOfView, screenAspect;

	D3D11_DEPTH_STENCIL_DESC depthDisabledStencilDesc;

	D3D11_BLEND_DESC blendStateDescription;

	//store the vsync setting
	m_vsync_enabled = vsync;

	//Create a directx graphics interface factory
	result = CreateDXGIFactory(__uuidof(IDXGIFactory), (void**)&factory);
	if(FAILED(result))
	{
		return false;
	}

	//use the factory to create an adapter for the primary graphics
	//interface (video card).
	result = factory->EnumAdapters(0, &adapter);
	if(FAILED(result))
	{
		return false;
	}

	//enum the primary adapter output (monitor)
	result = adapter->EnumOutputs(0, &adapterOutput);
	if(FAILED(result))
	{
		return false;
	}

	//get the number of modes that fit the 
	//DXGI_FORMAT_R8G8B8A8_UNORM display format for the adapter output
	result = adapterOutput->GetDisplayModeList(DXGI_FORMAT_R8G8B8A8_UNORM, DXGI_ENUM_MODES_INTERLACED, &numModes, NULL);
	if(FAILED(result))
	{
		return false;
	}

	//create a list to hold all the possible display modes for this monitor/video card combo
	displayModeList = new DXGI_MODE_DESC[numModes];
	if(!displayModeList)
	{
		return false;
	}

	//now fill the adapter mode list structures
	result = adapterOutput->GetDisplayModeList(DXGI_FORMAT_R8G8B8A8_UNORM,
		DXGI_ENUM_MODES_INTERLACED, &numModes, displayModeList);
	if(FAILED(result))
	{
		return false;
	}

	//now go through all the display modes and find the one that matches
	//the screen h/w when a match is found store the numerator
	//and deniminator of the refresh rate for that monitor
	for(i=0; i<numModes; i++)
	{
		if(displayModeList[i].Width == (unsigned int)screenWidth)
		{
			if(displayModeList[i].Height == (unsigned int)screenHeight)
			{
				numerator = displayModeList[i].RefreshRate.Numerator;
				denominator = displayModeList[i].RefreshRate.Denominator;
			}
		}
	}

	//get the adapter(video card) desc
	result = adapter->GetDesc(&adapterDesc);
	if(FAILED(result))
	{
		return false;
	}

	//store the dedicated video card memory in megabytes
	m_videoCardMemory = (int)(adapterDesc.DedicatedVideoMemory /1024 / 1024);

	//convert the name of the video card to a character array and store it
	error = wcstombs_s(&stringLength, m_videoCardDescription, 128, adapterDesc.Description, 128);
	if(error != 0)
	{
		return false;
	}

	////release the display mode list
	delete[] displayModeList;
	displayModeList = 0;

	//release the adapter output
	adapterOutput->Release();
	adapterOutput = 0;

	//release the adapter
	adapter->Release();
	adapter = 0;

	//release the factory
	factory->Release();
	factory = 0;

	
	//Ini the swapchain desc
	ZeroMemory(&swapChainDesc, sizeof(swapChainDesc));

	//set to a single back buffer
	swapChainDesc.BufferCount = 1;

	//st the width and height of the back buffer
	swapChainDesc.BufferDesc.Width = screenWidth;
	swapChainDesc.BufferDesc.Height = screenHeight;

	//set the reg 32-bit surface for the back buffer
	swapChainDesc.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;

	//set the refresh rate of the back buffer
	if(m_vsync_enabled)
	{
		swapChainDesc.BufferDesc.RefreshRate.Numerator = numerator;
		swapChainDesc.BufferDesc.RefreshRate.Denominator = denominator;
	}
	else
	{
		swapChainDesc.BufferDesc.RefreshRate.Numerator = 0;
		swapChainDesc.BufferDesc.RefreshRate.Denominator = 1;
	}

	//set the usage of the back buffer
	swapChainDesc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;

	//set the handle for the window to render to
	swapChainDesc.OutputWindow = hwnd;

	//turn multisampling off
	swapChainDesc.SampleDesc.Count = 1;
	swapChainDesc.SampleDesc.Quality = 0;

	//set to full screen or windowed mode
	if(fullscreen)
	{
		swapChainDesc.Windowed = false;
	}
	else
	{
		swapChainDesc.Windowed = true;
	}

	//set the scan line ordering and scaling to unspecified
	swapChainDesc.BufferDesc.ScanlineOrdering = DXGI_MODE_SCANLINE_ORDER_UNSPECIFIED;
	swapChainDesc.BufferDesc.Scaling = DXGI_MODE_SCALING_UNSPECIFIED;

	//discard the back buffer contexts after presenting
	swapChainDesc.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;

	//dont set the advanced flags
	swapChainDesc.Flags = 0;

	//set the feature level to DX 11
	featureLevel = D3D_FEATURE_LEVEL_11_0;

	//create the swapchain, D3Ddevice and d3d device context
	result = D3D11CreateDeviceAndSwapChain(NULL, D3D_DRIVER_TYPE_HARDWARE, NULL, 0, &featureLevel,
		1, D3D11_SDK_VERSION, &swapChainDesc, &m_swapChain, &m_device, NULL, &m_deviceContext);
	if(FAILED(result))
	{
		return false;
	}

	//get the pointer to the back buffer
	result = m_swapChain->GetBuffer(0, __uuidof(ID3D11Texture2D), (LPVOID*)&backBufferPtr);
	if(FAILED(result))
	{
		return false;
	}

	//create the render target view with the back buffer pointer
	result = m_device->CreateRenderTargetView(backBufferPtr, NULL, &m_renderTargetView);
	if(FAILED(result))
	{
		return false;
	}

	//release the pointer to the back buffer as we no longer need it
	backBufferPtr->Release();
	backBufferPtr = 0;

	ZeroMemory(&depthBufferDesc, sizeof(depthBufferDesc));

	//set up the desc of th depth buffer
	depthBufferDesc.Width = screenWidth;
	depthBufferDesc.Height = screenHeight;
	depthBufferDesc.MipLevels = 1;
	depthBufferDesc.ArraySize = 1;
	depthBufferDesc.Format = DXGI_FORMAT_D24_UNORM_S8_UINT;
	depthBufferDesc.SampleDesc.Count = 1;
	depthBufferDesc.SampleDesc.Quality = 0;
	depthBufferDesc.Usage = D3D11_USAGE_DEFAULT;
	depthBufferDesc.BindFlags = D3D11_BIND_DEPTH_STENCIL;
	depthBufferDesc.CPUAccessFlags = 0;
	depthBufferDesc.MiscFlags = 0;

	//create the texture for the depth buffer using the filled out desc
	result = m_device->CreateTexture2D(&depthBufferDesc, NULL, &m_depthStencilBuffer);
	if(FAILED(result))
	{
		return false;
	}


	// Initialize the description of the stencil state.
	ZeroMemory(&depthStencilDesc, sizeof(depthStencilDesc));

	// Set up the description of the stencil state.
	depthStencilDesc.DepthEnable = true;
	depthStencilDesc.DepthWriteMask = D3D11_DEPTH_WRITE_MASK_ALL;
	depthStencilDesc.DepthFunc = D3D11_COMPARISON_LESS;

	depthStencilDesc.StencilEnable = true;
	depthStencilDesc.StencilReadMask = 0xFF;
	depthStencilDesc.StencilWriteMask = 0xFF;

	// Stencil operations if pixel is front-facing.
	depthStencilDesc.FrontFace.StencilFailOp = D3D11_STENCIL_OP_KEEP;
	depthStencilDesc.FrontFace.StencilDepthFailOp = D3D11_STENCIL_OP_INCR;
	depthStencilDesc.FrontFace.StencilPassOp = D3D11_STENCIL_OP_KEEP;
	depthStencilDesc.FrontFace.StencilFunc = D3D11_COMPARISON_ALWAYS;

	// Stencil operations if pixel is back-facing.
	depthStencilDesc.BackFace.StencilFailOp = D3D11_STENCIL_OP_KEEP;
	depthStencilDesc.BackFace.StencilDepthFailOp = D3D11_STENCIL_OP_DECR;
	depthStencilDesc.BackFace.StencilPassOp = D3D11_STENCIL_OP_KEEP;
	depthStencilDesc.BackFace.StencilFunc = D3D11_COMPARISON_ALWAYS;

	// Create the depth stencil state.
	result = m_device->CreateDepthStencilState(&depthStencilDesc, &m_depthStencilState);
	if(FAILED(result))
	{
		return false;
	}


	// Set the depth stencil state.
	m_deviceContext->OMSetDepthStencilState(m_depthStencilState, 1);

	// Initailze the depth stencil view.
	ZeroMemory(&depthStencilViewDesc, sizeof(depthStencilViewDesc));

	// Set up the depth stencil view description.
	depthStencilViewDesc.Format = DXGI_FORMAT_D24_UNORM_S8_UINT;
	depthStencilViewDesc.ViewDimension = D3D11_DSV_DIMENSION_TEXTURE2D;
	depthStencilViewDesc.Texture2D.MipSlice = 0;

	// Create the depth stencil view.
	result = m_device->CreateDepthStencilView(m_depthStencilBuffer, &depthStencilViewDesc, &m_depthStencilView);
	if(FAILED(result))
	{
		return false;
	}

	// Bind the render target view and depth stencil buffer to the output render pipeline.
	m_deviceContext->OMSetRenderTargets(1, &m_renderTargetView, m_depthStencilView);


	// Setup the raster description which will determine how and what polygons will be drawn.
	rasterDesc.AntialiasedLineEnable = false;
	rasterDesc.CullMode = D3D11_CULL_BACK;
	rasterDesc.DepthBias = 0;
	rasterDesc.DepthBiasClamp = 0.0f;
	rasterDesc.DepthClipEnable = true;
	rasterDesc.FillMode = D3D11_FILL_SOLID;
	rasterDesc.FrontCounterClockwise = false;
	rasterDesc.MultisampleEnable = false;
	rasterDesc.ScissorEnable = false;
	rasterDesc.SlopeScaledDepthBias = 0.0f;

	// Create the rasterizer state from the description we just filled out.
	result = m_device->CreateRasterizerState(&rasterDesc, &m_rasterState);
	if(FAILED(result))
	{
		return false;
	}

	// Now set the rasterizer state.
	m_deviceContext->RSSetState(m_rasterState);


	// Setup the viewport for rendering.
	viewport.Width = (float)screenWidth;
	viewport.Height = (float)screenHeight;
	viewport.MinDepth = 0.0f;
	viewport.MaxDepth = 1.0f;
	viewport.TopLeftX = 0.0f;
	viewport.TopLeftY = 0.0f;

	// Create the viewport.
	m_deviceContext->RSSetViewports(1, &viewport);

	// Setup the projection matrix.
	fieldOfView = (float)D3DX_PI / 4.0f;
	screenAspect = (float)screenWidth / (float)screenHeight;

	// Create the projection matrix for 3D rendering.
	D3DXMatrixPerspectiveFovLH(&m_projectionMatrix, fieldOfView, screenAspect, screenNear, screenDepth);

	// Initialize the world matrix to the identity matrix.
	D3DXMatrixIdentity(&m_worldMatrix);

	// Create an orthographic projection matrix for 2D rendering.
	D3DXMatrixOrthoLH(&m_orthoMatrix, (float)screenWidth, (float)screenHeight, screenNear, screenDepth);

	//clear the second depth stencil state 
	ZeroMemory(&depthDisabledStencilDesc, sizeof(depthDisabledStencilDesc));

	//now create a second depth stencil state which turns off the Z buffer for 2d rendering 
	//the only difference is that depthenable is set to false

	depthDisabledStencilDesc.DepthEnable = false;
	depthDisabledStencilDesc.DepthWriteMask = D3D11_DEPTH_WRITE_MASK_ALL;
	depthDisabledStencilDesc.DepthFunc = D3D11_COMPARISON_LESS;
	depthDisabledStencilDesc.StencilEnable = true;
	depthDisabledStencilDesc.StencilReadMask = 0xFF;
	depthDisabledStencilDesc.StencilWriteMask = 0xFF;
	depthDisabledStencilDesc.FrontFace.StencilFailOp = D3D11_STENCIL_OP_KEEP;
	depthDisabledStencilDesc.FrontFace.StencilDepthFailOp = D3D11_STENCIL_OP_INCR;
	depthDisabledStencilDesc.FrontFace.StencilPassOp = D3D11_STENCIL_OP_KEEP;
	depthDisabledStencilDesc.FrontFace.StencilFunc = D3D11_COMPARISON_ALWAYS;
	depthDisabledStencilDesc.BackFace.StencilFailOp = D3D11_STENCIL_OP_KEEP;
	depthDisabledStencilDesc.BackFace.StencilDepthFailOp = D3D11_STENCIL_OP_DECR;
	depthDisabledStencilDesc.BackFace.StencilPassOp = D3D11_STENCIL_OP_KEEP;
	depthDisabledStencilDesc.BackFace.StencilFunc = D3D11_COMPARISON_ALWAYS;

	//create the state using the device
	result = m_device->CreateDepthStencilState(&depthDisabledStencilDesc, &m_depthDisabledStencilState);
	if(FAILED(result))
	{
		return false;
	}

	//clear the blend state desc
	ZeroMemory(&blendStateDescription, sizeof(D3D11_BLEND_DESC));

		// Create an alpha enabled blend state description.
	blendStateDescription.RenderTarget[0].BlendEnable = TRUE;
	blendStateDescription.RenderTarget[0].SrcBlend = D3D11_BLEND_ONE;
	blendStateDescription.RenderTarget[0].DestBlend = D3D11_BLEND_INV_SRC_ALPHA;
	blendStateDescription.RenderTarget[0].BlendOp = D3D11_BLEND_OP_ADD;
	blendStateDescription.RenderTarget[0].SrcBlendAlpha = D3D11_BLEND_ONE;
	blendStateDescription.RenderTarget[0].DestBlendAlpha = D3D11_BLEND_ZERO;
	blendStateDescription.RenderTarget[0].BlendOpAlpha = D3D11_BLEND_OP_ADD;
	blendStateDescription.RenderTarget[0].RenderTargetWriteMask = 0x0f;

	//create the blend state using the desc
	result = m_device->CreateBlendState(&blendStateDescription, &m_alphaEnableBlendingState);
	if(FAILED(result))
	{
		return false;
	}

	//modify the dfesc to create an alpha disabled blend state desc
	blendStateDescription.RenderTarget[0].BlendEnable = FALSE;


	//create the blend state using the desc
	result = m_device->CreateBlendState(&blendStateDescription, &m_alphaDisableBlendingState);
	if(FAILED(result))
	{
		return false;
	}


	return true;
}

void D3DClass::Shutdown()
{
	// Before shutting down set to windowed mode or when you release the swap chain it will throw an exception.
	if(m_swapChain)
	{
		m_swapChain->SetFullscreenState(false, NULL);
	}
	
	if(m_alphaEnableBlendingState)
	{
		m_alphaEnableBlendingState->Release();
		m_alphaEnableBlendingState = 0;
	}

	if(m_alphaDisableBlendingState)
	{
		m_alphaDisableBlendingState->Release();
		m_alphaDisableBlendingState = 0;
	}

	if(m_rasterState)
	{
		m_rasterState->Release();
		m_rasterState = 0;
	}

	if(m_depthStencilView)
	{
		m_depthStencilView->Release();
		m_depthStencilView = 0;
	}
	
	if(m_depthDisabledStencilState)
	{
		m_depthDisabledStencilState->Release();
		m_depthDisabledStencilState = 0;
	}


	if(m_depthStencilState)
	{
		m_depthStencilState->Release();
		m_depthStencilState = 0;
	}

	if(m_depthStencilBuffer)
	{
		m_depthStencilBuffer->Release();
		m_depthStencilBuffer = 0;
	}

	if(m_renderTargetView)
	{
		m_renderTargetView->Release();
		m_renderTargetView = 0;
	}

	if(m_deviceContext)
	{
		m_deviceContext->Release();
		m_deviceContext = 0;
	}

	if(m_device)
	{
		m_device->Release();
		m_device = 0;
	}

	if(m_swapChain)
	{
		m_swapChain->Release();
		m_swapChain = 0;
	}

	return;
}

void D3DClass::BeginScene(float red, float green, float blue, float alpha)
{
	float color[4];

	//setup the color to clear the buffer to
	color[0] = red;
	color[1] = green;
	color[2] = blue;
	color[3] = alpha;

	// Clear the back buffer.
	m_deviceContext->ClearRenderTargetView(m_renderTargetView, color);
    
	// Clear the depth buffer.
	m_deviceContext->ClearDepthStencilView(m_depthStencilView, D3D11_CLEAR_DEPTH, 1.0f, 0);

	return;
}

void D3DClass::EndScene()
{
	// Present the back buffer to the screen since rendering is complete.
	if(m_vsync_enabled)
	{
		// Lock to screen refresh rate.
		m_swapChain->Present(1, 0);
	}
	else
	{
		// Present as fast as possible.
		m_swapChain->Present(0, 0);
	}

	return;
}

ID3D11Device* D3DClass::GetDevice()
{
	return m_device;
}


ID3D11DeviceContext* D3DClass::GetDeviceContext()
{
	return m_deviceContext;
}

void D3DClass::GetProjectionMatrix(D3DXMATRIX& projectionMatrix)
{
	projectionMatrix = m_projectionMatrix;
	return;
}


void D3DClass::GetWorldMatrix(D3DXMATRIX& worldMatrix)
{
	worldMatrix = m_worldMatrix;
	return;
}


void D3DClass::GetOrthoMatrix(D3DXMATRIX& orthoMatrix)
{
	orthoMatrix = m_orthoMatrix;
	return;
}

void D3DClass::GetVideoCardInfo(char* cardName, int& memory)
{
	strcpy_s(cardName, 128, m_videoCardDescription);
	memory = m_videoCardMemory;
	return;
}

void D3DClass::TurnZBufferOn()
{
	m_deviceContext->OMSetDepthStencilState(m_depthStencilState ,1);
	return;
}

void D3DClass::TurnZBufferOff()
{
	m_deviceContext->OMSetDepthStencilState(m_depthDisabledStencilState, 1);
	return;
}

void D3DClass::TurnOnAlphaBlending()
{
	float blendFactor[4];
	

	// Setup the blend factor.
	blendFactor[0] = 0.0f;
	blendFactor[1] = 0.0f;
	blendFactor[2] = 0.0f;
	blendFactor[3] = 0.0f;
	
	// Turn on the alpha blending.
	m_deviceContext->OMSetBlendState(m_alphaEnableBlendingState, blendFactor, 0xffffffff);

	return;
}

void D3DClass::TurnOffAlphaBlending()
{
	float blendFactor[4];
	

	// Setup the blend factor.
	blendFactor[0] = 0.0f;
	blendFactor[1] = 0.0f;
	blendFactor[2] = 0.0f;
	blendFactor[3] = 0.0f;
	
	// Turn off the alpha blending.
	m_deviceContext->OMSetBlendState(m_alphaDisableBlendingState, blendFactor, 0xffffffff);

	return;
}