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I have mapped some values into my texture on my alpha channel. Actually I use my texture as 2Darray. What I need is a way to read the alpha value of the map at position e.g. [4][5] (representing x and y)
I need the returned value available in my pixelshader. Is there any way to do this?
I use DX9.
Thx in advance!
Do you want to use the texel at [4][5] (x,y) for your entire pixelshader?
if that is your question you could just precalc that cordinate on the vertex shader and passit along to every vertex, and then sample with that uv cords. this way it wont get interpolated. (or it will, but it will only have one value to interpolate with)
other than that you probably have to specifiy abit more on what you are trying to achive.
What are you using it for? when will it occure, what sort of mesh are you using it for?