sampler.h

//
// Copyright 2020 Pixar
//
// Licensed under the Apache License, Version 2.0 (the "Apache License")
// with the following modification; you may not use this file except in
// compliance with the Apache License and the following modification to it:
// Section 6. Trademarks. is deleted and replaced with:
//
// 6. Trademarks. This License does not grant permission to use the trade
//    names, trademarks, service marks, or product names of the Licensor
//    and its affiliates, except as required to comply with Section 4(c) of
//    the License and to reproduce the content of the NOTICE file.
//
// You may obtain a copy of the Apache License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the Apache License with the above modification is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the Apache License for the specific
// language governing permissions and limitations under the Apache License.
//
#ifndef PXR_IMAGING_HGI_SAMPLER_H
#define PXR_IMAGING_HGI_SAMPLER_H

#include "pxr/pxr.h"
#include "pxr/imaging/hgi/api.h"
#include "pxr/imaging/hgi/enums.h"
#include "pxr/imaging/hgi/handle.h"
#include "pxr/imaging/hgi/types.h"

#include <string>
#include <vector>

PXR_NAMESPACE_OPEN_SCOPE


struct HgiSamplerDesc
{
    HgiSamplerDesc()
        : magFilter(HgiSamplerFilterNearest)
        , minFilter(HgiSamplerFilterNearest)
        , mipFilter(HgiMipFilterNotMipmapped)
        , addressModeU(HgiSamplerAddressModeClampToEdge)
        , addressModeV(HgiSamplerAddressModeClampToEdge)
        , addressModeW(HgiSamplerAddressModeClampToEdge)
        , borderColor(HgiBorderColorTransparentBlack)
        , enableCompare(false)
        , compareFunction(HgiCompareFunctionNever)
    {}

    std::string debugName;
    HgiSamplerFilter magFilter;
    HgiSamplerFilter minFilter;
    HgiMipFilter mipFilter;
    HgiSamplerAddressMode addressModeU;
    HgiSamplerAddressMode addressModeV;
    HgiSamplerAddressMode addressModeW;
    HgiBorderColor borderColor;
    bool enableCompare;
    HgiCompareFunction compareFunction;
};

HGI_API
bool operator==(
    const HgiSamplerDesc& lhs,
    const HgiSamplerDesc& rhs);

HGI_API
bool operator!=(
    const HgiSamplerDesc& lhs,
    const HgiSamplerDesc& rhs);


class HgiSampler
{
public:
    HGI_API
    virtual ~HgiSampler();

    HGI_API
    HgiSamplerDesc const& GetDescriptor() const;

    HGI_API
    virtual uint64_t GetRawResource() const = 0;

protected:
    HGI_API
    HgiSampler(HgiSamplerDesc const& desc);

    HgiSamplerDesc _descriptor;

private:
    HgiSampler() = delete;
    HgiSampler & operator=(const HgiSampler&) = delete;
    HgiSampler(const HgiSampler&) = delete;
};

using HgiSamplerHandle = HgiHandle<HgiSampler>;
using HgiSamplerHandleVector = std::vector<HgiSamplerHandle>;


PXR_NAMESPACE_CLOSE_SCOPE

#endif