Sets a texture to be desaturated, to make it greyscale.

shaderSupported = texture:SetDesaturated(desaturation);

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Arguments

desaturation

nil = normal colors
1 = desaturate (greyscale)

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Returns

shaderSupported

returns nil if desaturation isn't supported by the user's graphics card (ie. old GeForce4 cards don't). One can use texture:SetVertexColor instead in this case. See the example below for the way Blizzard handles this.

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There is a wrapper function in UIParent.lua that appears to darken the texture if shaderSupported returns false:

-- Wrapper for the desaturation function
function SetDesaturation(texture, desaturation)
	local shaderSupported = texture:SetDesaturated(desaturation);
	if ( not shaderSupported ) then
		if ( desaturation ) then
			texture:SetVertexColor(0.5, 0.5, 0.5);
		else
			texture:SetVertexColor(1.0, 1.0, 1.0);
		end
		
	end
end