desaturate_ps.txt
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desaturate_ps.txt
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	varying vec2 uv;
	uniform sampler2D texture;
	uniform float level;
	const vec3 gray = vec3(0.30, 0.59, 0.11);

	void main() {
	vec4 color = texture2D(texture, uv);
	gl_FragColor.rgb = mix(vec3(dot(gray, color.rgb * gl_Color.rgb)), color.rgb * gl_Color.rgb, level);
	gl_FragColor.a = color.a * gl_Color.a;
	}

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