

local SobelMaterial = Material( "pp/sobel" )

SobelMaterial:SetTexture( "$fbtexture", render.GetScreenEffectTexture() )



-- convars

local pp_sobel = CreateClientConVar( "pp_sobel", "0", false, false )

local pp_sobel_threshold = CreateClientConVar( "pp_sobel_threshold", "0.11", true, false )



--[[------------------------------------

	DrawSobel()

--------------------------------------]]

function DrawSobel( threshold )



	render.UpdateScreenEffectTexture()



	-- update threshold value

	SobelMaterial:SetFloat( "$threshold", threshold )



	render.SetMaterial( SobelMaterial )

	render.DrawScreenQuad()

	

end



--[[------------------------------------

	DrawInternal()

--------------------------------------]]

local function DrawInternal()



	if ( !pp_sobel:GetBool() ) then return end

	if ( !GAMEMODE:PostProcessPermitted( "sobel" ) ) then return end



	DrawSobel( pp_sobel_threshold:GetFloat() )



end

hook.Add( "RenderScreenspaceEffects", "RenderSobel", DrawInternal )



list.Set( "PostProcess", "#sobel_pp", {



	icon		= "gui/postprocess/sobel.png",

	convar		= "pp_sobel",

	category	= "#shaders_pp",

	

	cpanel		= function( CPanel )



		CPanel:AddControl( "Header", { Description = "#sobel_pp.desc" } )

		CPanel:AddControl( "CheckBox", { Label = "#sobel_pp.enable", Command = "pp_sobel" } )

		

		local params = { Options = {}, CVars = {}, MenuButton = "1", Folder = "sobel" }

		params.Options[ "#preset.default" ] = { pp_sobel_threshold = "0.11" }

		params.CVars = table.GetKeys( params.Options[ "#preset.default" ] )

		CPanel:AddControl( "ComboBox", params )

		

		CPanel:AddControl( "Slider", { Label = "#sobel_pp.threshold", Command = "pp_sobel_threshold", Type = "Float", Min = "0", Max = "1" } )

	

	end



} )

