#[repr(C)]
#[derive(Debug)]
pub struct GPUFloatMixTexture {
    tex1: GPUFloatTexture,
    tex2: GPUFloatTexture,
}

#[repr(C)]
#[derive(Debug)]
pub struct GPUFloatDirectionMixTexture {
    tex1: GPUFloatTexture,
    tex2: GPUFloatTexture,
    dir: Vector3f,
}