Sampler.h

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#ifndef FCT_RHI_SAMPLER_H
#define FCT_RHI_SAMPLER_H
namespace FCT
{
    enum class FilterMode {
        Nearest,
        Linear
    };
 
    enum class AddressMode {
        Repeat,
        MirroredRepeat,
        ClampToEdge,
        ClampToBorder,
        MirrorClampToEdge
    };
 
    enum class CompareOp {
        Never,
        Less,
        Equal,
        LessOrEqual,
        Greater,
        NotEqual,
        GreaterOrEqual,
        Always
    };
 
    enum class BorderColor {
        TransparentBlack,
        OpaqueBlack,
        OpaqueWhite
    };
 
    class Sampler {
    public:
        virtual ~Sampler() = default;
 
        virtual void setFilter(FilterMode magFilter, FilterMode minFilter, FilterMode mipmapFilter) {
            m_magFilter = magFilter;
            m_minFilter = minFilter;
            m_mipmapFilter = mipmapFilter;
        }
 
        virtual void setAddressMode(AddressMode u, AddressMode v, AddressMode w) {
            m_addressModeU = u;
            m_addressModeV = v;
            m_addressModeW = w;
        }
 
        virtual void setAnisotropy(bool enable, float maxAnisotropy) {
            m_anisotropyEnable = enable;
            m_maxAnisotropy = maxAnisotropy;
        }
 
        virtual void setCompare(bool enable, CompareOp op) {
            m_compareEnable = enable;
            m_compareOp = op;
        }
 
        virtual void setLodRange(float minLod, float maxLod, float bias) {
            m_minLod = minLod;
            m_maxLod = maxLod;
            m_mipLodBias = bias;
        }
 
        virtual void setBorderColor(BorderColor color) {
            m_borderColor = color;
        }
 
        virtual void setUnnormalizedCoordinates(bool unnormalized) {
            m_unnormalizedCoordinates = unnormalized;
        }
 
        virtual void create() = 0;
 
        virtual void setLinear() {
            setFilter(FilterMode::Linear, FilterMode::Linear, FilterMode::Linear);
            setAddressMode(AddressMode::Repeat, AddressMode::Repeat, AddressMode::Repeat);
            setAnisotropy(false, 1.0f);
            setCompare(false, CompareOp::Never);
            setLodRange(0.0f, 1000.0f, 0.0f);
            setBorderColor(BorderColor::OpaqueBlack);
            setUnnormalizedCoordinates(false);
        }
 
        virtual void setPoint() {
            setFilter(FilterMode::Nearest, FilterMode::Nearest, FilterMode::Nearest);
            setAddressMode(AddressMode::Repeat, AddressMode::Repeat, AddressMode::Repeat);
            setAnisotropy(false, 1.0f);
            setCompare(false, CompareOp::Never);
            setLodRange(0.0f, 1000.0f, 0.0f);
            setBorderColor(BorderColor::OpaqueBlack);
            setUnnormalizedCoordinates(false);
        }
 
        virtual void setAnisotropic(float maxAnisotropy = 16.0f) {
            setFilter(FilterMode::Linear, FilterMode::Linear, FilterMode::Linear);
            setAddressMode(AddressMode::Repeat, AddressMode::Repeat, AddressMode::Repeat);
            setAnisotropy(true, maxAnisotropy);
            setCompare(false, CompareOp::Never);
            setLodRange(0.0f, 1000.0f, 0.0f);
            setBorderColor(BorderColor::OpaqueBlack);
            setUnnormalizedCoordinates(false);
        }
 
        virtual void setLinearClamp() {
            setFilter(FilterMode::Linear, FilterMode::Linear, FilterMode::Linear);
            setAddressMode(AddressMode::ClampToEdge, AddressMode::ClampToEdge, AddressMode::ClampToEdge);
            setAnisotropy(false, 1.0f);
            setCompare(false, CompareOp::Never);
            setLodRange(0.0f, 1000.0f, 0.0f);
            setBorderColor(BorderColor::OpaqueBlack);
            setUnnormalizedCoordinates(false);
        }
 
        virtual void setShadowMap() {
            setFilter(FilterMode::Linear, FilterMode::Linear, FilterMode::Linear);
            setAddressMode(AddressMode::ClampToBorder, AddressMode::ClampToBorder, AddressMode::ClampToBorder);
            setAnisotropy(false, 1.0f);
            setCompare(true, CompareOp::Less);
            setLodRange(0.0f, 1000.0f, 0.0f);
            setBorderColor(BorderColor::OpaqueWhite);
            setUnnormalizedCoordinates(false);
        }
 
    protected:
        FilterMode m_magFilter = FilterMode::Linear;
        FilterMode m_minFilter = FilterMode::Linear;
        FilterMode m_mipmapFilter = FilterMode::Linear;
 
        AddressMode m_addressModeU = AddressMode::Repeat;
        AddressMode m_addressModeV = AddressMode::Repeat;
        AddressMode m_addressModeW = AddressMode::Repeat;
 
        float m_mipLodBias = 0.0f;
        bool m_anisotropyEnable = false;
        float m_maxAnisotropy = 1.0f;
 
        bool m_compareEnable = false;
        CompareOp m_compareOp = CompareOp::Never;
 
        float m_minLod = 0.0f;
        float m_maxLod = 1000.0f;
 
        BorderColor m_borderColor = BorderColor::OpaqueBlack;
        bool m_unnormalizedCoordinates = false;
    };
}
#endif //FCT_RHI_SAMPLER_H