blackwhite.fx / grayscale.fx

[ds1-e]

Hey.

I have one big problem. Well i want to do something like, if we loss a lot of HP, then our screen will change colors, starting from minimal color changes, ends at this almost blackwhite screen. I wanna do similar thing as one MTA server have. Unfortunately i know nothing about using .fx files. So here i have 4 files, first it's script which use it, original blackwhite.fx and modified one and also grayscale.fx maybe it should help with something but i am not sure about it.

local w, h = guiGetScreenSize();
isShaderBlackWhite = false

function renderShader()
	dxSetRenderTarget();
	dxUpdateScreenSource(screenSrc2);
	dxDrawImage(0,0,w,h,screenShader2);
end

function startRender()
  if screenShader2 == nil and screenSrc2 == nil then
    screenShader2 = dxCreateShader( "blackwhite.fx" );
	screenSrc2 = dxCreateScreenSource( w, h );
	if screenShader2 and screenSrc2 then
			dxSetShaderValue( screenShader2, "screenSource", screenSrc2 );
			addEventHandler( "onClientHUDRender", getRootElement( ), renderShader );
	end
	isShaderBlackWhite = true
  end
end

function stopRender()
	if screenShader2 and screenSrc2 then
		destroyElement( screenShader2 );
		destroyElement( screenSrc2 );
		screenShader2, screenSrc2 = nil, nil;
		removeEventHandler( "onClientHUDRender", getRootElement( ), renderShader );
		isShaderBlackWhite = false
	end
end


function checkblood()  
  if not getElementData(getLocalPlayer(), "blood") then 
   return 
  end 
  if getElementData(getLocalPlayer(), "blood") <= 3631  then  
   startRender()  
  end  
  if getElementData(getLocalPlayer(), "blood") >= 3632  then  
   stopRender()  
  end  
end   
setTimer(checkblood,2000,0)
--addEventHandler("onClientPreRender",getRootElement(),getblood)

//
// blackwhite.fx
//

texture screenSource;
 
sampler TextureSampler = sampler_state
{
    Texture = <screenSource>;
};

float4 PixelShaderFunction(float2 TextureCoordinate : TEXCOORD0) : COLOR0
{
    float4 color = tex2D(TextureSampler, TextureCoordinate);
 
    float value = (color.r + color.g + color.b) / 3; 
    color.r = value;
    color.g = value;
    color.b = value;
 
    return color;
}
 
technique BlackAndWhite
{
    pass Pass1
    {
        PixelShader = compile ps_2_0 PixelShaderFunction();
    }
}

texture BlackWhiteTexture;	

sampler screenSampler = sampler_state
{
	Texture = <BlackWhiteTexture>;
};

float4 main(float2 uv : TEXCOORD0) : COLOR0 
{ 
    float4 Color; 
    Color = tex2D( screenSampler , uv); 
	Color.rgb = (Color.r+Color.g+Color.b)/3.0f; 
	if (Color.r<0.2 || Color.r>0.9) Color.r = 0; else Color.r = 1.0f; 
	if (Color.g<0.2 || Color.g>0.9) Color.g = 0; else Color.g = 1.0f; 
	if (Color.b<0.2 || Color.b>0.9) Color.b = 0; else Color.b = 1.0f;
    return Color; 
};

technique BlackWhite
{
	pass P1
	{
		PixelShader = compile ps_2_0 main();
	}
}

[/spoiler]

float ColourAmount;
Texture coloredTexture;

sampler coloredTextureSampler = sampler_state
{
    texture = <coloredTexture>;
};

float4 GreyscalePixelShaderFunction(float2 textureCoordinate : TEXCOORD0) : COLOR0
{
    float4 color = tex2D(coloredTextureSampler, textureCoordinate); 
    float3 colrgb = color.rgb;
    float greycolor = dot(colrgb, float3(0.3, 0.59, 0.11));

    colrgb.rgb = lerp(dot(greycolor, float3(0.3, 0.59, 0.11)), colrgb, ColourAmount);

    return float4(colrgb.rgb, color.a);
}

technique Grayscale
{
    pass GreyscalePass
    {
        PixelShader = compile ps_2_0 GreyscalePixelShaderFunction();
    }
}