--[[
| This file was obtained through the combined efforts
| of Madbluntz & Plymouth Antiquarian Society.
|
| Credits: lifestorm, Gregory Wayne Rossel JR.,
| 	Maloy, DrPepper10 @ RIP, Atle!
|
| Visit for more: https://plymouth.thetwilightzone.ru/
--]]


local matSunbeams = Material( "pp/sunbeams" )
matSunbeams:SetTexture( "$fbtexture", render.GetScreenEffectTexture() )

--[[---------------------------------------------------------
	Register the convars that will control this effect
-----------------------------------------------------------]]
local pp_sunbeams = CreateClientConVar( "pp_sunbeams", "0", false, false )
local pp_sunbeams_darken = CreateClientConVar( "pp_sunbeams_darken", "0.95", true, false )
local pp_sunbeams_multiply = CreateClientConVar( "pp_sunbeams_multiply", "1.0", true, false )
local pp_sunbeams_sunsize = CreateClientConVar( "pp_sunbeams_sunsize", "0.075", true, false )


function DrawSunbeams( darken, multiply, sunsize, sunx, suny )

	if ( !render.SupportsPixelShaders_2_0() ) then return end

	render.CopyRenderTargetToTexture( render.GetScreenEffectTexture() )

	matSunbeams:SetFloat( "$darken", darken )
	matSunbeams:SetFloat( "$multiply", multiply )
	matSunbeams:SetFloat( "$sunx", sunx )
	matSunbeams:SetFloat( "$suny", suny )
	matSunbeams:SetFloat( "$sunsize", sunsize )

	render.SetMaterial( matSunbeams )
	render.DrawScreenQuad()

end

hook.Add( "RenderScreenspaceEffects", "RenderSunbeams", function()

	if ( !pp_sunbeams:GetBool() ) then return end
	if ( !GAMEMODE:PostProcessPermitted( "sunbeams" ) ) then return end
	if ( !render.SupportsPixelShaders_2_0() ) then return end

	local sun = util.GetSunInfo()

	if ( !sun ) then return end
	if ( sun.obstruction == 0 ) then return end

	local sunpos = EyePos() + sun.direction * 4096
	local scrpos = sunpos:ToScreen()

	local dot = ( sun.direction:Dot( EyeVector() ) - 0.8 ) * 5
	if ( dot <= 0 ) then return end

	DrawSunbeams( pp_sunbeams_darken:GetFloat(), pp_sunbeams_multiply:GetFloat() * dot * sun.obstruction, pp_sunbeams_sunsize:GetFloat(), scrpos.x / ScrW(), scrpos.y / ScrH() )

end )

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

	icon = "gui/postprocess/sunrays.png",
	convar = "pp_sunbeams",
	category = "#shaders_pp",

	cpanel = function( CPanel )

		CPanel:AddControl( "Header", { Description = "#sunbeams_pp.desc" } )
		CPanel:AddControl( "CheckBox", { Label = "#sunbeams_pp.enable", Command = "pp_sunbeams" } )

		local params = { Options = {}, CVars = {}, MenuButton = "1", Folder = "sunbeams" }
		params.Options[ "#preset.default" ] = { pp_sunbeams = "0", pp_sunbeams_darken = "0.95", pp_sunbeams_multiply = "1", pp_sunbeams_sunsize = "0.075" }
		params.CVars = table.GetKeys( params.Options[ "#preset.default" ] )
		CPanel:AddControl( "ComboBox", params )

		CPanel:AddControl( "Slider", { Label = "#sunbeams_pp.multiply", Command = "pp_sunbeams_multiply", Type = "Float", Min = "0", Max = "1" } )
		CPanel:AddControl( "Slider", { Label = "#sunbeams_pp.darken", Command = "pp_sunbeams_darken", Type = "Float", Min = "0", Max = "1" } )
		CPanel:AddControl( "Slider", { Label = "#sunbeams_pp.size", Command = "pp_sunbeams_sunsize", Type = "Float", Min = "0.01", Max = "0.25" } )

	end

} )