Grayscale

Converts a texture to grayscale

Uniforms:
weighted: determines whether or not to use the normal average or weighted average for calculating the shade of gray (The weighted average is more accurate to human perception of colors)

Shader code

shader_type canvas_item;

// --- Uniforms --- //
uniform bool weighted = true;	// Determines whether to use normal or weighted averages

void fragment() {
	COLOR.rgb = mix(vec3((COLOR.r + COLOR.g + COLOR.b) / 3.0),  vec3(0.299 * COLOR.r + 0.587 * COLOR.g + 0.114 * COLOR.b), float(weighted));
}

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