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uarep-ctl/shaders/two-color.gdshader

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shader_type canvas_item;
uniform vec3 grey = vec3(0.14, 0.13, 0.13);
uniform vec3 orange = vec3(0.95, 0.55, 0.05);
uniform float gamma = 2.0;
vec3 bw_to_2color(vec3 c, vec3 dark, vec3 light)
{
float l = pow(c.r * 0.2126 + c.g * 0.7152 + c.b * 0.0722, gamma);
return mix(light, dark, l);
}
void fragment()
{
COLOR.rgb = bw_to_2color(texture(TEXTURE, UV).rgb, grey, orange);
}