/**
 * @file llgltfaccessor.h
 * @brief LL GLTF Implementation
 *
 * $LicenseInfo:firstyear=2024&license=viewergpl$
 *
 * Copyright (c) 2024, Linden Research, Inc.
 *
 * Second Life Viewer Source Code
 * The source code in this file ("Source Code") is provided by Linden Lab
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 * ("GPL"), unless you have obtained a separate licensing agreement
 * ("Other License"), formally executed by you and Linden Lab.  Terms of
 * the GPL can be found in doc/GPL-license.txt in this distribution, or
 * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
 *
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 */

#ifndef LL_LLGLTFACCESSOR_H
#define LL_LLGLTFACCESSOR_H

#include <vector>
#include <string>

#include "llpreprocessor.h"
#include "stdtypes.h"

// Saves from including "tinygltf/tiny_gltf.h" here. HB
#ifndef TINYGLTF_TYPE_VEC2
# define TINYGLTF_TYPE_VEC2 (2)
# define TINYGLTF_TYPE_VEC3 (3)
# define TINYGLTF_TYPE_VEC4 (4)
# define TINYGLTF_TYPE_MAT2 (32 + 2)
# define TINYGLTF_TYPE_MAT3 (32 + 3)
# define TINYGLTF_TYPE_MAT4 (32 + 4)
# define TINYGLTF_TYPE_SCALAR (64 + 1)
# define LL_CLEANUP_TINYGLTF_DEFINES
#endif
namespace tinygltf
{
	struct Accessor;
	struct Buffer;
	struct BufferView;
}

namespace LLGLTF
{
	constexpr S32 INVALID_INDEX = -1;

	class Buffer
	{
	public:
		const Buffer& operator=(const tinygltf::Buffer& src);

	public:
		std::string		mName;
		std::string		mUri;
		std::vector<U8>	mData;
	};

	class BufferView
	{
	public:
		LL_INLINE BufferView()
		:	mBuffer(INVALID_INDEX)
		{
		}

		const BufferView& operator=(const tinygltf::BufferView& src);

	public:
		std::string	mName;
		S32			mBuffer;
		S32			mByteLength;
		S32			mByteOffset;
		S32			mByteStride;
		S32			mTarget;
		S32			mComponentType;
	};
	
	class Accessor
	{
	public:
		LL_INLINE Accessor()
		:	mBufferView(INVALID_INDEX)
		{
		}

		const Accessor& operator=(const tinygltf::Accessor& src);

		enum class Type : S32
		{
			SCALAR = TINYGLTF_TYPE_SCALAR,
			VEC2 = TINYGLTF_TYPE_VEC2,
			VEC3 = TINYGLTF_TYPE_VEC3,
			VEC4 = TINYGLTF_TYPE_VEC4,
			MAT2 = TINYGLTF_TYPE_MAT2,
			MAT3 = TINYGLTF_TYPE_MAT3,
			MAT4 = TINYGLTF_TYPE_MAT4
		};

	public:
		std::string			mName;
		std::vector<F64> 	mMax;
		std::vector<F64> 	mMin;

		S32					mType;
		S32					mBufferView;
		S32					mByteOffset;
		S32					mComponentType;
		S32					mCount;
		bool				mNormalized;
	};
}

#ifdef LL_CLEANUP_TINYGLTF_DEFINES
# undef TINYGLTF_TYPE_VEC2
# undef TINYGLTF_TYPE_VEC3
# undef TINYGLTF_TYPE_VEC4
# undef TINYGLTF_TYPE_MAT2
# undef TINYGLTF_TYPE_MAT3
# undef TINYGLTF_TYPE_MAT4
# undef TINYGLTF_TYPE_SCALAR
# undef LL_CLEANUP_TINYGLTF_DEFINES
#endif

#endif	// LL_LLGLTFACCESSOR_H