Mesh Gradients

local vgui_white = Material("vgui/white")

function draw.GradientV(x, y, w, h, col_a, col_b)
    render.SetMaterial(vgui_white)

    mesh.Begin(MATERIAL_QUADS, 1)
        mesh.Position(Vector(x, y, 0))
        mesh.Color(col_a:Unpack())
        mesh.AdvanceVertex()

        mesh.Position(Vector(x + w, y, 0))
        mesh.Color(col_a:Unpack())
        mesh.AdvanceVertex()

        mesh.Position(Vector(x + w, y + h, 0))
        mesh.Color(col_b:Unpack())
        mesh.AdvanceVertex()

        mesh.Position(Vector(x, y + h, 0))
        mesh.Color(col_b:Unpack())
        mesh.AdvanceVertex()
    mesh.End()
end

function draw.GradientH(x, y, w, h, col_a, col_b)
    render.SetMaterial(vgui_white)

    mesh.Begin(MATERIAL_QUADS, 1)
        mesh.Position(Vector(x + w, y, 0))
        mesh.Color(col_b:Unpack())
        mesh.AdvanceVertex()

        mesh.Position(Vector(x + w, y + h, 0))
        mesh.Color(col_b:Unpack())
        mesh.AdvanceVertex()

        mesh.Position(Vector(x, y + h, 0))
        mesh.Color(col_a:Unpack())
        mesh.AdvanceVertex()

        mesh.Position(Vector(x, y , 0))
        mesh.Color(col_a:Unpack())
        mesh.AdvanceVertex()
    mesh.End()
end