////////////////////////////////////////////////////////////////////////////////
// Filename: rendertextureclass.cpp
////////////////////////////////////////////////////////////////////////////////
#include "rendertextureclass.h"


RenderTextureClass::RenderTextureClass()
{
	m_renderTargetTexture = 0;
	m_renderTargetView = 0;
	m_shaderResourceView = 0;
}


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


RenderTextureClass::~RenderTextureClass()
{
}


bool RenderTextureClass::Initialize(ID3D11Device* device, int textureWidth, int textureHeight)
{
	D3D11_TEXTURE2D_DESC textureDesc;
	HRESULT result;
	D3D11_RENDER_TARGET_VIEW_DESC renderTargetViewDesc;
	D3D11_SHADER_RESOURCE_VIEW_DESC shaderResourceViewDesc;


	// Initialize the render target texture description.
	ZeroMemory(&textureDesc, sizeof(textureDesc));

	// Setup the render target texture description.
	textureDesc.Width = textureWidth;
	textureDesc.Height = textureHeight;
	textureDesc.MipLevels = 1;
	textureDesc.ArraySize = 1;
	textureDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
	textureDesc.SampleDesc.Count = 1;
	textureDesc.Usage = D3D11_USAGE_DEFAULT;
	textureDesc.BindFlags = D3D11_BIND_RENDER_TARGET | D3D11_BIND_SHADER_RESOURCE;
	textureDesc.CPUAccessFlags = 0;
    textureDesc.MiscFlags = 0;

	// Create the render target texture.
	result = device->CreateTexture2D(&textureDesc, NULL, &m_renderTargetTexture);
	if(FAILED(result))
	{
		return false;
	}

	// Setup the description of the render target view.
	renderTargetViewDesc.Format = textureDesc.Format;
	renderTargetViewDesc.ViewDimension = D3D11_RTV_DIMENSION_TEXTURE2D;
	renderTargetViewDesc.Texture2D.MipSlice = 0;

	// Create the render target view.
	result = device->CreateRenderTargetView(m_renderTargetTexture, &renderTargetViewDesc, &m_renderTargetView);
	if(FAILED(result))
	{
		return false;
	}

	// Setup the description of the shader resource view.
	shaderResourceViewDesc.Format = textureDesc.Format;
	shaderResourceViewDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
	shaderResourceViewDesc.Texture2D.MostDetailedMip = 0;
	shaderResourceViewDesc.Texture2D.MipLevels = 1;

	// Create the shader resource view.
	result = device->CreateShaderResourceView(m_renderTargetTexture, &shaderResourceViewDesc, &m_shaderResourceView);
	if(FAILED(result))
	{
		return false;
	}

	return true;
}


void RenderTextureClass::Shutdown()
{
	if(m_shaderResourceView)
	{
		m_shaderResourceView->Release();
		m_shaderResourceView = 0;
	}

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

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

	return;
}


void RenderTextureClass::SetRenderTarget(ID3D11DeviceContext* deviceContext, ID3D11DepthStencilView* depthStencilView)
{
	// Bind the render target view and depth stencil buffer to the output render pipeline.
	deviceContext->OMSetRenderTargets(1, &m_renderTargetView, depthStencilView);
	
	return;
}


void RenderTextureClass::ClearRenderTarget(ID3D11DeviceContext* deviceContext, ID3D11DepthStencilView* depthStencilView, 
										   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.
	deviceContext->ClearRenderTargetView(m_renderTargetView, color);
    
	// Clear the depth buffer.
	deviceContext->ClearDepthStencilView(depthStencilView, D3D11_CLEAR_DEPTH | D3D11_CLEAR_STENCIL, 1.0f, 0);

	return;
}


ID3D11ShaderResourceView* RenderTextureClass::GetShaderResourceView()
{
	return m_shaderResourceView;
}


ID3D11Texture2D* RenderTextureClass::GetTexture()
{
	return m_renderTargetTexture;
}