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// File name: Bloom.h

// Des: Bloom post effect

// Date: 29/5/1390

// Programmer: Ali Akbar Mohammadi(Kochol)



#include "../../Include/efx/Bloom.h"

#include "../../Include/efx/EffectManager.h"

#include "../../Include/gfx/Renderer.h"

#include "../../Include/gui/Image.h"

#include "../../Include/gui/GuiManager.h"



namespace kge

{

namespace efx

{

	//------------------------------------------------------------------------------------

	// Constructor

	//------------------------------------------------------------------------------------

	Bloom::Bloom(): m_bEnable(true)

	{

		//***************************************

		// Create Image

		//***************************************

		m_pMat		   = new gfx::Material();



		gfx::Renderer*	ren = gfx::Renderer::GetSingletonPtr();

		kge::core::RectI ri;

		ri.X = 0;

		ri.Y = 0;

		ri.Width = ren->GetWindowWidth() / 4;

		ri.Height = ren->GetWindowHeight() / 4;

		float height = ren->GetWindowHeight();

		float width = ren->GetWindowWidth();



		m_pImage = Device::GetSingletonPtr()->GetGuiManager()->AddImage("../media/box.png", ri);

		m_pImage->m_BackImage = EffectManager::GetSingletonPtr()->GetSceneTexture();



		//***************************************

		// Create 4x down filter pixel shader

		//***************************************

		char ps4xDownFilterCode[] = 

			"float2 PixelCoordsDownFilter[16];\n"\

			"\n"\

			"sampler2D g_samSrcColor: register(s6);\n"\

			"\n"\

			"//-----------------------------------------------------------------------------\n"\

			"// Pixel Shader: DownFilter\n"\

			"// Desc: Perform a high-pass filter and on the source texture  and scale down.\n"\

			"//-----------------------------------------------------------------------------\n"\

			"float4 DownFilter( in float2 Tex : TEXCOORD0 ) : COLOR0\n"\

			"{\n"\

			"//return tex2D( g_samSrcColor, Tex);\n"\

			"    float4 Color = 0;\n"\

			"\n"\

			"    for (int i = 0; i < 16; i++)\n"\

			"    {\n"\

			"        Color += tex2D( g_samSrcColor, Tex +  PixelCoordsDownFilter[i].xy );\n"\

			"    }\n"\

			"\n"\

			"    return Color / 16;\n"\

			"}\n";



		m_pPs4xDownFilter = gfx::Renderer::GetSingletonPtr()->CreatePixelShaderFromString(ps4xDownFilterCode, "DownFilter", gfx::ESV_PS2);

		m_shPixelCoordsDownFilter = m_pPs4xDownFilter->GetConstatnt("PixelCoordsDownFilter");



		m_fPixelCoordsDownFilter[0] = 1.5 / width;

		m_fPixelCoordsDownFilter[1] = -1.5 / height;

		m_fPixelCoordsDownFilter[2] = 1.5 / width;

		m_fPixelCoordsDownFilter[3] = -0.5 / height;

		m_fPixelCoordsDownFilter[4] = 1.5 / width;

		m_fPixelCoordsDownFilter[5] =  0.5 / height;

		m_fPixelCoordsDownFilter[6] = 1.5 / width;

		m_fPixelCoordsDownFilter[7] =  1.5 / height;

		m_fPixelCoordsDownFilter[8] = 0.5 / width;

		m_fPixelCoordsDownFilter[9] = -1.5 / height;

		m_fPixelCoordsDownFilter[10] = 0.5 / width;

		m_fPixelCoordsDownFilter[11] = -0.5 / height;

		m_fPixelCoordsDownFilter[12] = 0.5 / width;

		m_fPixelCoordsDownFilter[13] =  0.5 / height;

		m_fPixelCoordsDownFilter[14] = 0.5 / width;

		m_fPixelCoordsDownFilter[15] =  1.5 / height;

		m_fPixelCoordsDownFilter[16] =-0.5 / width;

		m_fPixelCoordsDownFilter[17] = -1.5 / height;

		m_fPixelCoordsDownFilter[18] =-0.5 / width;

		m_fPixelCoordsDownFilter[19] = -0.5 / height;

		m_fPixelCoordsDownFilter[20] =-0.5 / width;

		m_fPixelCoordsDownFilter[21] =  0.5 / height;

		m_fPixelCoordsDownFilter[22] =-0.5 / width;

		m_fPixelCoordsDownFilter[23] =  1.5 / height;

		m_fPixelCoordsDownFilter[24] =-1.5 / width;

		m_fPixelCoordsDownFilter[25] = -1.5 / height;

		m_fPixelCoordsDownFilter[26] =-1.5 / width;

		m_fPixelCoordsDownFilter[27] = -0.5 / height;

		m_fPixelCoordsDownFilter[28] =-1.5 / width;

		m_fPixelCoordsDownFilter[29] =  0.5 / height;

		m_fPixelCoordsDownFilter[30] =-1.5 / width;

		m_fPixelCoordsDownFilter[31] =  1.5 / height;



		//***************************************

		// Bright pass

		//***************************************

		char psBrightPass[] = 

			"sampler2D g_txSrcColor;\n"\

			"\n"\

			"static const float Luminance = 0.08f;\n"\

			"static const float fMiddleGray = 0.18f;\n"\

			"static const float fWhiteCutoff = 0.8f;\n"\

			"\n"\

			"//-----------------------------------------------------------------------------\n"\

			"// Pixel Shader: BrightPassFilter\n"\

			"// Desc: Perform a high-pass filter on the source texture\n"\

			"//-----------------------------------------------------------------------------\n"\

			"float4 BrightPassFilter( in float2 Tex : TEXCOORD0 ) :  COLOR0\n"\

			"{\n"\

			"    float3 ColorOut = tex2D( g_txSrcColor, Tex ).rgb;\n"\

			"//return float4(Tex.x,Tex.y,0.0, 1.0);\n"\

			"    ColorOut *= fMiddleGray / ( Luminance + 0.001f );\n"\

			"    ColorOut *= ( 1.0f + ( ColorOut / ( fWhiteCutoff *  fWhiteCutoff ) ) );\n"\

			"    ColorOut -= 5.0f;\n"\

			"\n"\

			"    ColorOut = max( ColorOut, 0.0f );\n"\

			"\n"\

			"    ColorOut /= ( 10.0f + ColorOut );\n"\

			"\n"\

			"    return float4( ColorOut, 1.0f );\n"\

			"}\n";



		m_pPsBrightPass = gfx::Renderer::GetSingletonPtr()->CreatePixelShaderFromString(psBrightPass, "BrightPassFilter", gfx::ESV_PS2);



		//***************************************

		// Vertical Bloom

		//***************************************

		char psVerticlaBloom[] =

			"sampler2D g_samSrcColor;\n"\

			"\n"\

			"static const int g_cKernelSize = 13;\n"\

			"float2 PixelKernel[g_cKernelSize];\n"\

			"static const float BlurWeights[g_cKernelSize] = \n"\

			"{\n"\

			"    0.002216,\n"\

			"    0.008764,\n"\

			"    0.026995,\n"\

			"    0.064759,\n"\

			"    0.120985,\n"\

			"    0.176033,\n"\

			"    0.199471,\n"\

			"    0.176033,\n"\

			"    0.120985,\n"\

			"    0.064759,\n"\

			"    0.026995,\n"\

			"    0.008764,\n"\

			"    0.002216,\n"\

			"};\n"\

			"\n"\

			"static const float BloomScale = 1.5f;\n"\

			"\n"\

			"//-----------------------------------------------------------------------------\n"\

			"// Pixel Shader: HorizontalBlur\n"\

			"// Desc: Blurs the image vertically\n"\

			"//-----------------------------------------------------------------------------\n"\

			"float4 PostProcessPS( float2 Tex : TEXCOORD0 ) : COLOR0\n"\

			"{\n"\

			"    float4 Color = 0;\n"\

			"\n"\

			"    for (int i = 0; i < g_cKernelSize; i++)\n"\

			"    {    \n"\

			"        Color += tex2D( g_samSrcColor, Tex +  PixelKernel[i].xy ) * BlurWeights[i];\n"\

			"    }\n"\

			"\n"\

			"    return Color * BloomScale;\n"\

			"}\n";



		for (int i = 0; i < 26; i+=2)

			m_fPixelKernelV[i] = 0.0;

		m_fPixelKernelV[1] =    -6.0 / height;

		m_fPixelKernelV[3] =    -5.0 / height;

		m_fPixelKernelV[5] =    -4.0 / height;

		m_fPixelKernelV[7] =    -3.0 / height;

		m_fPixelKernelV[9] =    -2.0 / height;

		m_fPixelKernelV[11] =    -1.0 / height;

		m_fPixelKernelV[13] =     0.0 / height;

		m_fPixelKernelV[15] =     1.0 / height;

		m_fPixelKernelV[17] =     2.0 / height;

		m_fPixelKernelV[19] =     3.0 / height;

		m_fPixelKernelV[21] =     4.0 / height;

		m_fPixelKernelV[23] =     5.0 / height;

		m_fPixelKernelV[25] =     6.0 / height;

		for (int i = 1; i < 26; i+=2)

			m_fPixelKernelH[i] = 0.0;

		m_fPixelKernelH[0] =    -6.0 / width;

		m_fPixelKernelH[2] =    -5.0 / width;

		m_fPixelKernelH[4] =    -4.0 / width;

		m_fPixelKernelH[6] =    -3.0 / width;

		m_fPixelKernelH[8] =    -2.0 / width;

		m_fPixelKernelH[10] =    -1.0 / width;

		m_fPixelKernelH[12] =     0.0 / width;

		m_fPixelKernelH[14] =     1.0 / width;

		m_fPixelKernelH[16] =     2.0 / width;

		m_fPixelKernelH[18] =     3.0 / width;

		m_fPixelKernelH[20] =     4.0 / width;

		m_fPixelKernelH[22] =     5.0 / width;

		m_fPixelKernelH[24] =     6.0 / width;



		m_pPsVerticalBloom = gfx::Renderer::GetSingletonPtr()->CreatePixelShaderFromString(psVerticlaBloom, "PostProcessPS", gfx::ESV_PS2);



		if (m_pPsVerticalBloom)

			m_shPixelKernel = m_pPsVerticalBloom->GetConstatnt("PixelKernel");



		// Combine shader

		char psCombine[] = 

			"sampler2D g_samSrcColor;\n"\

			"sampler2D g_samSceneColor: register (s6);\n"\

			"\n"\

			"//-----------------------------------------------------------------------------\n"\

			"// Pixel Shader: Combine\n"\

			"// Desc: Combine the source image with the original image.\n"\

			"//-----------------------------------------------------------------------------\n"\

			"float4 Combine( float2 Tex : TEXCOORD0\n"\

			"                 ) : COLOR0\n"\

			"{\n"\

			"    float3 ColorOrig = tex2D( g_samSceneColor, Tex * 4 ).rgb;\n"\

			"\n"\

			"    ColorOrig += tex2D( g_samSrcColor, Tex ).rgb;// * float3(2.0, 0.0, 0.0);\n"\

			"\n"\

			"    return float4( ColorOrig, 1.0f );\n"\

			"}\n";



		m_pPsCombine = gfx::Renderer::GetSingletonPtr()->CreatePixelShaderFromString(psCombine, "Combine", gfx::ESV_PS2);



	} // Constructor



	//------------------------------------------------------------------------------------

	// Destructor

	//------------------------------------------------------------------------------------

	Bloom::~Bloom()

	{



	} // Destructor



	//------------------------------------------------------------------------------------

	// The works must to do before rendering the object.

	//------------------------------------------------------------------------------------

	void Bloom::PreRender( float elapsedTime /*= 0.0f*/ )

	{



	} // PreRender



	//------------------------------------------------------------------------------------

	// The works must to do after rendering the object.

	//------------------------------------------------------------------------------------

	void Bloom::Render()

	{

		if (!m_bEnable)

			return;



		gfx::Renderer*	ren = gfx::Renderer::GetSingletonPtr();

		EffectManager* emgr = EffectManager::GetSingletonPtr();



		ren->Enable(gfx::ERF_2D);

		ren->SetTextureParams(gfx::ETP_Anisotropic, 0);

		ren->SetTextureParams(gfx::ETP_Anisotropic, 6);



		m_pImage->SetUV(0.0, 0.0, 1.0, 1.0);

		m_pImage->SetSize(ren->GetWindowWidth() / 4, ren->GetWindowHeight() / 4);



		// 4X down filter

		ren->SetRenderTarget(0, emgr->GetTempRenderTarget(1));

		m_pMat->shader->m_pPixelShader = m_pPs4xDownFilter;

		ren->SetMaterial(m_pMat);

		m_pPs4xDownFilter->SetConstant(m_shPixelCoordsDownFilter, m_fPixelCoordsDownFilter, 32);

		m_pImage->m_BackImage = emgr->GetSceneTexture();

		m_pImage->Render();



		m_pImage->SetUV(0.0, 0.0, 0.25, 0.25);



		// Render bright pass in 1/4 size in render target 0

		ren->SetRenderTarget(0, emgr->GetTempRenderTarget(0));

		m_pMat->shader->m_pPixelShader = m_pPsBrightPass;

		ren->SetMaterial(m_pMat);

		m_pImage->m_BackImage = emgr->GetTempRenderTarget(1);

		m_pImage->Render();



  		// Render vertical bloom in render target 1

  		ren->SetRenderTarget(0, emgr->GetTempRenderTarget(1));

   		m_pMat->shader->m_pPixelShader = m_pPsVerticalBloom;

   		m_pPsVerticalBloom->SetConstant(m_shPixelKernel, m_fPixelKernelV, 26);

   		ren->SetMaterial(m_pMat);

 	  	m_pImage->m_BackImage = emgr->GetTempRenderTarget(0);

   		m_pImage->Render();



  		// Render horizontal bloom in render target 0

   		ren->SetRenderTarget(0, emgr->GetTempRenderTarget(0));

   		//ren->BeginRendering(true, false, false);

   		//ren->Enable(gfx::ERF_2D);

   		m_pMat->shader->m_pPixelShader = m_pPsVerticalBloom;

   		m_pPsVerticalBloom->SetConstant(m_shPixelKernel, m_fPixelKernelH, 26);

   		ren->SetMaterial(m_pMat);

   		m_pImage->m_BackImage = emgr->GetTempRenderTarget(1);

   		m_pImage->Render();

  		//ren->EndRendering();

  

  		// Render vertical bloom in render target 1

  		ren->SetRenderTarget(0, emgr->GetTempRenderTarget(1));

  		m_pMat->shader->m_pPixelShader = m_pPsVerticalBloom;

  		m_pPsVerticalBloom->SetConstant(m_shPixelKernel, m_fPixelKernelV, 26);

  		ren->SetMaterial(m_pMat);

  		m_pImage->m_BackImage = emgr->GetTempRenderTarget(0);

  		m_pImage->Render();

  

  		// Render horizontal bloom in render target 0

  		ren->SetRenderTarget(0, emgr->GetTempRenderTarget(0));

  		m_pMat->shader->m_pPixelShader = m_pPsVerticalBloom;

  		m_pPsVerticalBloom->SetConstant(m_shPixelKernel, m_fPixelKernelH, 26);

  		ren->SetMaterial(m_pMat);

  		m_pImage->m_BackImage = emgr->GetTempRenderTarget(1);

  		m_pImage->Render();



		// Render result

		ren->SetRenderTarget();

		ren->Disable(gfx::ERF_DepthBuffer);

		m_pMat->shader->m_pPixelShader = m_pPsCombine;//NULL;//

		ren->SetMaterial(m_pMat);

		ren->SetTexture(emgr->GetSceneTexture(), 6);

		m_pImage->m_BackImage = emgr->GetTempRenderTarget(0);//emgr->GetSceneTexture();//

		m_pImage->SetSize(ren->GetWindowWidth(), ren->GetWindowHeight());

		m_pImage->Render();

		ren->Enable(gfx::ERF_DepthBuffer);



 		ren->Disable(gfx::ERF_2D);



	} // Render



} // efx



} // kge