//
// Copyright 2016 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_GLF_UV_TEXTURE_STORAGE_DATA_H
#define PXR_IMAGING_GLF_UV_TEXTURE_STORAGE_DATA_H

#include "pxr/pxr.h"
#include "pxr/imaging/glf/api.h"
#include "pxr/imaging/glf/image.h"
#include "pxr/imaging/glf/baseTextureData.h"

#include "pxr/base/vt/value.h"

PXR_NAMESPACE_OPEN_SCOPE


TF_DECLARE_WEAK_AND_REF_PTRS(GlfUVTextureStorageData);

class GlfUVTextureStorageData : public GlfBaseTextureData
{
public:
    GLF_API
    static GlfUVTextureStorageDataRefPtr
    New(unsigned int width,
        unsigned int height, 
        const VtValue &storageData);

    GLF_API
    virtual ~GlfUVTextureStorageData();

    int NumDimensions() const override;

    // GlfBaseTextureData overrides
    int ResizedWidth(int mipLevel = 0) const override {
        return _resizedWidth;
    };

    int ResizedHeight(int mipLevel = 0) const override {
        return _resizedHeight;
    };

    int ResizedDepth(int mipLevel = 0) const override {
        return 1;
    };

    GLenum GLInternalFormat() const override {
        return _glInternalFormat;
    };

    GLenum GLFormat() const override {
        return _glFormat;
    };

    GLenum GLType() const override {
        return _glType;
    };

    size_t TargetMemory() const override {
        return _targetMemory;
    };

    WrapInfo GetWrapInfo() const override {
        return _wrapInfo;
    };

    GLF_API
    size_t ComputeBytesUsed() const override;

    size_t ComputeBytesUsedByMip(int mipLevel = 0) const override {
        return ComputeBytesUsed();
    }

    GLF_API
    bool HasRawBuffer(int mipLevel = 0) const override;

    GLF_API
    unsigned char * GetRawBuffer(int mipLevel = 0) const override;

    GLF_API
    bool Read(
        int degradeLevel, 
        bool generateMipmap,
        GlfImage::ImageOriginLocation originLocation =
            GlfImage::OriginUpperLeft) override;
    
    GLF_API
    bool IsCompressed() const override;

    GLF_API
    int GetNumMipLevels() const override;

private:

    GlfUVTextureStorageData(
        unsigned int width,
        unsigned int height, 
        const VtValue &storageData);
        
    size_t _targetMemory;

    int _resizedWidth, _resizedHeight;
    int _bytesPerPixel;

    // Note: may not want to retain copy of original data
    // if _storageData is used for larger images
    VtValue _storageData; 

    GLenum  _glInternalFormat, _glFormat, _glType;

    WrapInfo _wrapInfo;

    int _size;

    unsigned char *_rawBuffer;
};

PXR_NAMESPACE_CLOSE_SCOPE

#endif // PXR_IMAGING_GLF_UV_TEXTURE_STORAGE_DATA_H