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blink0k

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Joined: 22nd Feb 2013

Location: the land of oz

Posted: 27th Nov 2017 20:40 Edited at: 27th Nov 2017 20:42

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I am very very very very very very very new to shaders. What i am trying to do i simple copy a mask from one image to another.
My shader looks like this and i'm rendering to a quad;

+ Code Snippet

    vec4 basecolor = texture2D(texture0, uvVarying);
    vec4 overcolor = texture2D(texture1, uvVarying);
     
    //-- alpha blend

	basecolor.a = overcolor.a;
	
    //-- minus to erase
    gl_FragColor = basecolor;

My problem is if i copy the mask from imageA to imageB and then imageB to imageC and ImageC to ImageD etc the alpha mask degrades.

This is my initial image