checkerboard pattern sdl2 rust

finishline.rs

    let mut finish_line_tex = texture_creator
        .create_texture_streaming(PixelFormatEnum::RGB24,
                                  FINISH_LINE_LENGTH as u32,
                                  FINISH_LINE_WIDTH as u32)
        .unwrap();
    finish_line_tex.set_blend_mode(BlendMode::Add);
    finish_line_tex
        .with_lock(None,
                   |buffer: &mut [u8], pitch: usize| for y in 0..FINISH_LINE_WIDTH {
                       for x in 0..FINISH_LINE_LENGTH {
                           let offset = y as usize * pitch + x as usize * 3;
                           let color = if (y as f64 / 5.0) as i32 % 2 == 0 {
                               if (x as f64 / 5.0) as i32 % 2 == 0 {
                                   0
                               } else {
                                   128
                               }
                           } else {
                               if (x as f64 / 5.0) as i32 % 2 == 0 {
                                   128
                               } else {
                                   0
                               }
                           };

                           buffer[offset] = color;
                           buffer[offset + 1] = color;
                           buffer[offset + 2] = color;

                       }
                   })
        .unwrap();