godot_clip_mask.shader

shader_type canvas_item;

// this is a simple godot shader to clip (or crop or mask) a sprite to a smaller area
// pass in 4 values representing the left, right, top, bottom extents to clip to.
// they should be values between 0 and 1 because we're working with an UV texture.

uniform float left_clip = 0.0;
uniform float right_clip = 1.0;
uniform float top_clip = 0.0;
uniform float bottom_clip = 1.0;
 
void fragment() {
    if(UV.x > right_clip) {
        discard;
    }
    if(UV.x <= left_clip) {
        discard;
    }
    if(UV.y > bottom_clip) {
        discard;
    }
    if(UV.y <= top_clip) {
        discard;
    }
}