Sampler.h

// Copyright 2022 ShenMian
// License(Apache-2.0)
 
#pragma once
 
class Sampler
{
public:
    // 纹理过滤方式
    enum class Filter
    {
        Nearest,  
        Bilinear, 
        Trilinear 
    };
 
    // 纹理环绕方式(纹理寻址方式)
    enum class Warp
    {
        Repeat,      
        ClampToEdge, 
        MirrorRepeat 
    };
 
    struct Descriptor
    {
        Filter minFilter = Filter::Nearest;
        Filter magFilter = Filter::Bilinear;
 
        Warp SWarp = Warp::Repeat;
        Warp TWarp = Warp::Repeat;
        Warp RWarp = Warp::Repeat;
 
        float maxAnisotropy = 0.f;
    };
 
    Sampler(const Descriptor& desc);
 
    Filter get_min_filter() const noexcept;
    Filter get_mag_filter() const noexcept;
 
    Warp get_s_warp_mode() const noexcept;
    Warp get_t_warp_mode() const noexcept;
    Warp get_r_warp_mode() const noexcept;
 
protected:
    Filter min_filter_;
    Filter mag_filter_;
    Warp   s_warp_;
    Warp   t_warp_;
    Warp   r_warp_;
};