Jump to content

  • Log In with Google      Sign In   
  • Create Account


How do I use adaptive bloom?


Old topic!
Guest, the last post of this topic is over 60 days old and at this point you may not reply in this topic. If you wish to continue this conversation start a new topic.

  • You cannot reply to this topic
2 replies to this topic

#1 Hawkblood   Members   -  Reputation: 722

Like
0Likes
Like

Posted 27 January 2013 - 08:53 AM

I am trying to use this "adaptive bloom" .fx with not much luck. The "bloom" part of it is working but I can't get it to "adapt". Here is the .fx code:

//This shader provides an automatic adaptive bloom effect based on screen brightness to scale the bloom effect
//Shader code by Mark Blosser
//email: mjblosser@gmail.com
//website: www.mjblosser.com
//released under creative commons license by attribution: http://creativecommons.org/licenses/by-sa/3.0/
string Description = "Adaptive Bloom by bond1";
string Thumbnail = "Blur.png";

float2 ViewSize : ViewSize;


//-----TWEAKABLES--------------------------------------------------------------------------------------//

float PreBloomBoost 
<
	string UIWidget = "slider";
	float UIMax = 4.0;
	float UIMin = 0.0;
	float UIStep = 0.1;
> = 2.0f;

float BloomThreshold 
<
	string UIWidget = "slider";
	float UIMax = 1.0;
	float UIMin = 0.0;
	float UIStep = 0.05;
> = 0.4;

float PostBloomBoost 
<
	string UIWidget = "slider";
	float UIMax = 4.0;
	float UIMin = 0.0;
	float UIStep = 0.1;
> = 2.0f;



/*float width 
<
	string UIWidget = "slider";
	float UIMax = 10.0;
	float UIMin = 1;
	float UIStep = 0.01;
> = 2.5;*/

//9 sample gauss filter, declare in pixel offsets convert to texel offsets in PS
float4 GaussFilter[9] =
{
    { -1,  -1, 0,  0.0625 },
    { -1,   1, 0,  0.0625 },
    {  1,  -1, 0,  0.0625 },
    {  1,   1, 0,  0.0625 },
    { -1,   0, 0,  0.125  },
    {  1,   0, 0,  0.125  },
    {  0,  -1, 0,  0.125 },
    {  0,   1, 0,  0.125 },
    {  0,   0, 0,  0.25 },
};



//---------------RENDER TARGET TEXTURES-------------------------------------------------------------------//

//starting scene image
texture frame : RENDERCOLORTARGET
< 
	string ResourceName = "";
	float2 ViewportRatio = {1.0,1.0 };
	
>;

sampler2D frameSamp = sampler_state {
    Texture = < frame >;
    MinFilter = Linear; MagFilter = Linear; MipFilter = Linear;
    AddressU = Clamp; AddressV = Clamp;
};

//2x2 average luminosity texture using point sampling
texture AvgLum2x2Img : RENDERCOLORTARGET 
< 
	string ResourceName = ""; 
	//float2 ViewportRatio = { 0.5, 0.5 };
	int width = 2;
	int height = 2;
>;

sampler2D AvgLum2x2ImgSamp = sampler_state {
    Texture = < AvgLum2x2Img >;
    MinFilter = Point; MagFilter = Point; MipFilter = Point;
    AddressU = Clamp; AddressV = Clamp;
};

//Average scene luminosity stored in 1x1 texture 
texture AvgLumFinal : RENDERCOLORTARGET 
< 
	string ResourceName = ""; 
	//float2 ViewportRatio = { 0.5, 0.5 };
	int width = 1;
	int height = 1;
>;

sampler2D AvgLumFinalSamp = sampler_state {
    Texture = < AvgLumFinal >;
    MinFilter = Point; MagFilter = Point; MipFilter = Point;
    AddressU = Clamp; AddressV = Clamp;
};

//reduce image to 1/8 size for brightpass
texture BrightpassImg : RENDERCOLORTARGET
< 
	string ResourceName = "";
	//float2 ViewportRatio = {0.125,0.125 };
	int width = 512;
	int height = 384;
	
>;

sampler2D BrightpassImgSamp = sampler_state {
    Texture = < BrightpassImg >;
    MinFilter = Linear; MagFilter = Linear; MipFilter = Linear;
    AddressU = Clamp; AddressV = Clamp;
};

//blur texture 1
texture Blur1Img : RENDERCOLORTARGET
< 
	string ResourceName = "";
	//float2 ViewportRatio = {0.125,0.125 };
	int width = 512;
	int height = 384;
	
>;

sampler2D Blur1ImgSamp = sampler_state {
    Texture = < Blur1Img >;
    MinFilter = Anisotropic; MagFilter = Anisotropic; MipFilter = Anisotropic;
    AddressU = Clamp; AddressV = Clamp;
};

//blur texture 2
texture Blur2Img : RENDERCOLORTARGET
< 
	string ResourceName = "";
	//float2 ViewportRatio = {0.125,0.125 };
	int width = 512;
	int height = 384;
	
>;

sampler2D Blur2ImgSamp = sampler_state {
    Texture = < Blur2Img >;
    MinFilter = Linear; MagFilter = Linear; MipFilter = Linear;
    AddressU = Clamp; AddressV = Clamp;
};

//-------------STRUCTS-------------------------------------------------------------

struct input 
{
	float4 pos : POSITION;
	float2 uv : TEXCOORD0;
};
 
struct output {

	float4 pos: POSITION;
	float2 uv: TEXCOORD0;

};

//-----------VERTEX SHADER------------------------------------------------------------//
output VS( input IN ) 
{
	output OUT;

	//quad needs to be shifted by half a pixel.
    //Go here for more info: http://www.sjbrown.co.uk/?article=directx_texels
    
	float4 oPos = float4( IN.pos.xy + float2( -1.0f/ViewSize.x, 1.0f/ViewSize.y ),0.0,1.0 );
	OUT.pos = oPos;

	float2 uv = (IN.pos.xy + 1.0) / 2.0;
	uv.y = 1 - uv.y; 
	OUT.uv = uv;
	
	return OUT;	
}

//---------PIXEL SHADERS--------------------------------------------------------------//

//takes original frame image and outputs to 2x2
float4 PSReduce( output IN, uniform sampler2D srcTex ) : COLOR
{
    float4 color = 0;    
    color= tex2D( srcTex, IN.uv );    
    return color;    
}

//-----------------computes average luminosity for scene-----------------------------
float4 PSGlareAmount( output IN, uniform sampler2D srcTex ) : COLOR
{
    float4 GlareAmount = 0;
    
    //sample texture 4 times with offset texture coordinates
    float4 color1= tex2D( srcTex, IN.uv + float2(-0.5, -0.5) );
    float4 color2= tex2D( srcTex, IN.uv + float2(-0.5, 0.5) );
    float4 color3= tex2D( srcTex, IN.uv + float2(0.5, -0.5) );
    float4 color4= tex2D( srcTex, IN.uv + float2(0.5, 0.5) );
    
    //average these samples
    float3 AvgColor = saturate(color1.xyz * 0.25 + color2.xyz * 0.25 + color3.xyz * 0.25 + color4.xyz * 0.25);
    
    //exxagerate values to make effect more evident
    AvgColor = 8*AvgColor*AvgColor;
    
    //convert to luminance
    AvgColor = dot(float3(0.3,0.59,0.11), AvgColor);
    
    GlareAmount.xyz = AvgColor;
    
    //interpolation value to blend with previous frames
    GlareAmount.w = 0.03;
       
    return GlareAmount;    
}


//-------------brightpass pixel shader, removes low luminance pixels--------------------------
float4 PSBrightpass( output IN, uniform sampler2D srcTex, uniform sampler2D srcTex2  ) : COLOR
{
    float4 screen = tex2D(srcTex, IN.uv);  //original screen texture;
    float4 glaretex = tex2D(srcTex2, IN.uv);  //glareamount from 1x1 in previous pass;
    
    //remove low luminance pixels, keeping only brightest
    float3 Brightest = saturate(screen.xyz - BloomThreshold) * PreBloomBoost;
    //Brightest.xyz = pow(Brightest.xyz,2) * 2;
    
    //apply glare adaption
    //float3 adapt = Brightest.xyz * (1-glaretex.xyz);
    
    float4 color = float4(Brightest.xyz, 1);
    
    return color;    
}

float4 PSBlur( output IN, uniform sampler2D srcTex ) : COLOR
{
    float4 color = float4(0,0,0,0);
    
    //inverse view for correct pixel to texel mapping
    float2 ViewInv = float2( 1/ViewSize.x,1/ViewSize.y);   
    
    //sample and output average colors using gauss filter samples
    for(int i=0;i<9;i++)
    
    {
    //float4 col = GaussFilter[i].w * tex2D(srcTex,IN.uv + float2(GaussFilter[i].x * ViewInv.x*width, GaussFilter[i].y *ViewInv.y*width));  
    float4 col = GaussFilter[i].w * tex2D(srcTex,IN.uv + float2(GaussFilter[i].x * ViewInv.x*2.5, GaussFilter[i].y *ViewInv.y*2.5));  
    color+=col;
    }
    return color;
}

//combine adaptive bloom texture with original scene image
float4 PSPresent( output IN, uniform sampler2D srcTex, uniform sampler2D srcTex2, uniform sampler2D srcTex3 ) : COLOR
{
    float4 color = float4(0,0,0,0);
    
    //sample screen texture and bloom texture
    float4 ScreenMap=tex2D(srcTex, IN.uv);
    float4 BloomMap=tex2D(srcTex2, IN.uv);
    float4 AmtMap=tex2D(srcTex3, IN.uv);
    
    //technique 1: just add results
    
    float Luminance = dot(ScreenMap.xyz, float3(0.3, 0.59, 0.11));
    float3 mod = lerp(PostBloomBoost,0,AmtMap.x);
    float3 final = ScreenMap + 0.25*ScreenMap*mod + mod*BloomMap;
    final  = lerp(final, ScreenMap+final*.1, Luminance);
    //float3 final = BloomMap;
    
    //technique 2: add results based scene pixel brightness
    //float Luminance = dot(ScreenMap.xyz, float3(0.3, 0.59, 0.11));
    //float4 MaxAmount= ScreenMap + BloomMap;
   // float3 final=lerp(MaxAmount, ScreenMap, Luminance);
    
    //technique 3: inverse multiplication
    //float3 final=(ScreenMap.xyz + BloomMap.xyz * (1-ScreenMap.xyz));
    
    color = float4(final,1);
    
    return color;
    
    
}

//-------TECHNIQUE------------------------------------------------------------------
  
technique AdaptiveBloom
<
	//specify where we want the original image to be put
	string RenderColorTarget = "frame";
>
{
	
	//1. first reduce to 2x2 and save in AvgLum2x2Img
	pass Reduce2x2
	<
		string RenderColorTarget = "AvgLum2x2Img";
	>
	{
		ZEnable = False;
		VertexShader = compile vs_1_1 VS();
		PixelShader = compile ps_2_0 PSReduce( frameSamp );
		
	}
	
	//2. reduce to 1x1 and save in AvgLumFinalImg, using alpha blending to blend with previous frames
	pass Reduce1x1
	<
		string RenderColorTarget = "AvgLumFinal";
	>
	{
		ZEnable = False;
		VertexShader = compile vs_1_1 VS();
		PixelShader = compile ps_2_0 PSGlareAmount( AvgLum2x2ImgSamp );
		AlphaBlendEnable = true;
		SrcBlend = SRCALPHA;
		DestBlend = INVSRCALPHA;
	}
	
	//3. remove low luminance pixels keeping only brightest for blurring in next pass
	pass Brightpass
	<
		string RenderColorTarget = "BrightpassImg";
	>
	{
		ZEnable = False;
		VertexShader = compile vs_1_1 VS();
		PixelShader = compile ps_2_0 PSBrightpass( frameSamp, AvgLumFinalSamp );
		
	}
	
	//4. blur texture and save in Blur1Img
	pass Blur1
	<
		string RenderColorTarget = "Blur1Img";
	>
	{
		ZEnable = False;
		VertexShader = compile vs_1_1 VS();
		PixelShader = compile ps_2_0 PSBlur( BrightpassImgSamp );
		
	}
	
	//5. repeat blur texture and save in Blur2Img
	pass Blur2
	<
		string RenderColorTarget = "Blur2Img";
	>
	{
		ZEnable = False;
		VertexShader = compile vs_1_1 VS();
		PixelShader = compile ps_2_0 PSBlur( Blur1ImgSamp );
		
	}
	
	//6. repeat blur again
	pass Blur3
	<
		string RenderColorTarget = "Blur1Img";
	>
	{
		ZEnable = False;
		VertexShader = compile vs_1_1 VS();
		PixelShader = compile ps_2_0 PSBlur( Blur2ImgSamp );
		
	}
	
	pass Blur4
	<
		string RenderColorTarget = "Blur2Img";
	>
	{
		ZEnable = False;
		VertexShader = compile vs_1_1 VS();
		PixelShader = compile ps_2_0 PSBlur( Blur1ImgSamp );
		
	}
	
	pass Blur5
	<
		string RenderColorTarget = "Blur1Img";
	>
	{
		ZEnable = False;
		VertexShader = compile vs_1_1 VS();
		PixelShader = compile ps_2_0 PSBlur( Blur2ImgSamp );
		
	}
	
	
	
	
	
	
	
	
	//send the combined image to the screen
	pass Present
	<
		string RenderColorTarget = "";
	>
	{
		VertexShader = compile vs_1_1 VS();
		PixelShader = compile ps_2_0 PSPresent( frameSamp, Blur1ImgSamp, AvgLumFinalSamp );
	}
}

I'm not very good with effects, so I must be doing something wrong......



Sponsor:

#2 Casey Hardman   Crossbones+   -  Reputation: 2161

Like
0Likes
Like

Posted 30 January 2013 - 12:32 AM

I don't know C++ or much about graphics programming, so I can't really read your code and give you any suggestions.

 

I don't want to leave you hanging, though, and I see you haven't gotten any help yet.

 

Is there any way you could reduce the amount of code you're posting?  That's a lot of lines, and it's probably putting people off...

Do you know of any specific pieces of code that you suspect might be causing your problem?  If so, maybe you could narrow the code down to those areas, and ask people if they see anything wrong with them?

 

Otherwise, maybe Google will treat you better.  Try some searches about adaptive bloom (if you haven't already, though I imagine you probably have...)

 

Sorry I can't be of any more help!


Edited by Sir Mac Jefferson, 30 January 2013 - 12:32 AM.


#3 Hawkblood   Members   -  Reputation: 722

Like
0Likes
Like

Posted 30 January 2013 - 08:54 AM

It's only the .fx file. It's not even c++..... This file is loaded as an effect file in my game. It works in the "bloom" part, but it's not automatically changing the bloom amount with the lighting changes. This effect is supposed to give a more realistic glare when you transition from a dark area into a bright area. It kinda makes the player feel like they are walking out of a dark interior into the bright sunlight so that there is the "white-out" and then it normalizes down so that you can see-- if that makes sense.






Old topic!
Guest, the last post of this topic is over 60 days old and at this point you may not reply in this topic. If you wish to continue this conversation start a new topic.



PARTNERS