draw_state::preset::blend::MULTIPLY

pub const MULTIPLY: Blend = Blend {
        color: BlendChannel {
            equation: Equation::Add,
            source: Factor::ZeroPlus(BlendValue::DestColor),
            destination: Factor::Zero,
        },
        alpha: BlendChannel {
            equation: Equation::Add,
            source: Factor::ZeroPlus(BlendValue::DestAlpha),
            destination: Factor::Zero,
        },
    }

When combining two fragments, multiply their values together.