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Description

"In some cases when you modulate sprites in Godot, the original colors of the sprite clashes with the color one wants to modulate into.\r\n\r\nTo avoid this, one would want to a greyscaled version of ones sprites, but manually greyscaling every sprite can be bothersome and you may want to smoothly transition between a greyscaled modulated sprite and a non-greyscaled version.\r\n\r\nThis albeit simple shader allows for that.\r\n\r\n\r\nSetup should be very simple\r\n\r\n1. Simply add a new shader material to a CanvasItem of your choice\r\n2. In the \"Shader\" slot of the shader material, create a new scripted shader.\r\n3. Paste the shader code\r\n\r\nWithin the shader material, you now have a parameter called \"Greyscale Ratio\" ranging from 0 to 1\r\n\r\nIf you now want change the modulate or self-modulate under the Visibility tab, the modulated color would act as if it is modulating the greyscaled version of your sprite\r\n\r\nFRIENDLY REMINDER!\r\nFor selectively greyscaling items, remember to tick \"Local To Scene\" and perhaps \"Make Unique\" on the material\r\nso the greyscale ratio is not changed across the board."

Shader code

shader_type canvas_item;
uniform float greyscale_ratio : hint_range(0.0, 1.0) = 1.0;

void fragment() {
	vec4 c = texture(TEXTURE,UV);
	vec4 modulate = COLOR / c; //Get Modulate
	COLOR = c;
	
	float avg = (COLOR.r + COLOR.g + COLOR.b)/ 3.0;
	COLOR.rgb = mix(COLOR.rgb, vec3(avg), greyscale_ratio);
	COLOR *= modulate; //Reintroduce Modulate
}

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