#version 430

// Input from vertex shader
flat in int v_instance_id;

// Output: Object ID encoded as RGB color
out vec4 fragColor;

void main() {
    // Encode instance ID into RGB channels
    // R = low byte, G = high byte, B = 0, A = 1
    int low_byte = v_instance_id & 0xFF;
    int high_byte = (v_instance_id >> 8) & 0xFF;
    
    fragColor = vec4(
        float(low_byte) / 255.0,
        float(high_byte) / 255.0,
        0.0,
        1.0
    );
}