<function name="SetWriteDepthToDestAlpha" parent="render" type="libraryfunc"> <description></description> <realm>Client</realm> <args> <arg name="enable" type="boolean"></arg> </args> </function> ⤶ ⤶ <example>⤶ <description>Draws a "masked" texture.</description>⤶ <code>⤶ -- Give the RT a size⤶ local TEX_SIZE = 512⤶ ⤶ -- Create the RT⤶ local tex = GetRenderTargetEx( "ExampleMaskRT", TEX_SIZE, TEX_SIZE, RT_SIZE_OFFSCREEN,⤶ MATERIAL_RT_DEPTH_SHARED --[[IMPORTANT]], 0, 0, IMAGE_FORMAT_RGBA8888 )⤶ ⤶ -- Create a translucent render-able material for our render target⤶ local myMat = CreateMaterial( "ExampleMaskRTMat", "UnlitGeneric", {⤶ ["$basetexture"] = tex:GetName(), -- Make the material use our render target texture⤶ ["$translucent"] = "1" -- make the drawn material transparent⤶ } )⤶ ⤶ local txBackground = Material( "models/weapons/v_toolgun/screen_bg" )⤶ local mask = Material( "gui/gradient_down" )⤶ ⤶ --[[⤶ A few words on the mask image. When creating a custom mask image, it must have an alpha channel which dictates⤶ what pixels to draw and which not to. The visual color should be all white for this example to work.⤶ Having lets say a red color mask would tint the final image red.⤶ ]]⤶ ⤶ function RenderMaskedRT()⤶ -- Draw the "background" image⤶ surface.SetDrawColor( color_white )⤶ surface.SetMaterial( txBackground )⤶ surface.DrawTexturedRect( 0, 0, TEX_SIZE, TEX_SIZE )⤶ -- Animate the background for fun⤶ surface.DrawTexturedRectRotated( TEX_SIZE / 2, TEX_SIZE / 2, TEX_SIZE, TEX_SIZE, CurTime() * 20 )⤶ ⤶ -- Draw the actual mask⤶ render.SetWriteDepthToDestAlpha( false )⤶ render.OverrideBlend( true, BLEND_SRC_COLOR, BLEND_SRC_ALPHA, 3 )⤶ surface.SetMaterial( mask )⤶ surface.DrawTexturedRect( 0, 0, TEX_SIZE, TEX_SIZE )⤶ render.OverrideBlend( false )⤶ render.SetWriteDepthToDestAlpha( true )⤶ end⤶ ⤶ -- Draw it on screen⤶ hook.Add( "HUDPaint", "DrawExampleMaskMat", function()⤶ -- Render animated stuff to the render target⤶ render.PushRenderTarget( tex )⤶ cam.Start2D()⤶ render.Clear( 0, 0, 0, 0 )⤶ RenderMaskedRT()⤶ cam.End2D()⤶ render.PopRenderTarget()⤶ ⤶ -- This is just for debugging, to see what it looks like without the mask⤶ -- RenderMaskedRT()⤶ ⤶ -- Actually draw the Render Target to see the final result.⤶ surface.SetDrawColor( color_white )⤶ surface.SetMaterial( myMat )⤶ surface.DrawTexturedRect( 520, 0, TEX_SIZE, TEX_SIZE )⤶ end )⤶ </code>⤶ <output>⤶ <upload src="70c/8d7ba1c1119faa7.png" size="226575" name="image.png" />⤶ </output>⤶ </example>⤶