InvisoPower.fsh
Chau (BlenderNavi)
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Authored By

	Chau (BlenderNavi)
	Aug 20 2022, 5:38 AM

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711 B

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InvisoPower.fsh
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	//
	// InvisoPower.fsh
	//
	// Created by 小小 on 24/6/2564.
	//
	// For change image black lines and white background become white lines and transparent background

	uniform sampler2D uniform_texture;

	varying vec2 textureCoordinate_noUniform;
	varying vec4 color_noUniform;

	void main() {

	// ---- color pixel
	vec4 color = color_noUniform*texture2D( uniform_texture, textureCoordinate_noUniform );
	// from REC 709
	float greyLevel = 0.212639color.r + 0.715169color.g + 0.072192*color.b;

	float inverseGreyLevel = 1.0 - greyLevel;
	float opacity = inverseGreyLevel*color.a;

	gl_FragColor = vec4( inverseGreyLevelopacity, inverseGreyLevelopacity, inverseGreyLevel*opacity, opacity );
	}