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*/

/// @file MDLLoader.h

/// @brief Declaration of the loader for MDL files

#pragma once

#ifndef AI_MDLLOADER_H_INCLUDED

#define AI_MDLLOADER_H_INCLUDED

#include <assimp/BaseImporter.h>

#include "MDLFileData.h"

#include "AssetLib/HMP/HalfLifeFileData.h"

#include "HalfLife/HL1ImportSettings.h"

struct aiNode;

struct aiTexture;

namespace Assimp {

using namespace MDL;

// --------------------------------------------------------------------------------------

// Include file/line information in debug builds

#ifdef ASSIMP_BUILD_DEBUG

#   define VALIDATE_FILE_SIZE(msg) SizeCheck(msg,__FILE__,__LINE__)

#else

#   define VALIDATE_FILE_SIZE(msg) SizeCheck(msg)

#endif

// --------------------------------------------------------------------------------------

/** @brief Class to load MDL files.

 *

 *  Several subformats exist:

 *   <ul>

 *      <li>Quake I</li>

 *      <li>3D Game Studio MDL3, MDL4</li>

 *      <li>3D Game Studio MDL5</li>

 *      <li>3D Game Studio MDL7</li>

 *      <li>Halflife 1</li>

 *      <li>Halflife 2</li>

 *   </ul>

 *  These formats are partially identical and it would be possible to load

 *  them all with a single 1000-line function-beast. However, it has been

 *  split into several code paths to make the code easier to read and maintain.

*/

class MDLImporter : public BaseImporter {

public:

    MDLImporter();

    ~MDLImporter() override = default;

    // -------------------------------------------------------------------

    /** Returns whether the class can handle the format of the given file.

    * See BaseImporter::CanRead() for details.  */

    bool CanRead( const std::string& pFile, IOSystem* pIOHandler,

        bool checkSig) const override;

    // -------------------------------------------------------------------

    /** Called prior to ReadFile().

    * The function is a request to the importer to update its configuration

    * basing on the Importer's configuration property list.

    */

    void SetupProperties(const Importer* pImp) override;

protected:

    // -------------------------------------------------------------------

    /** Return importer meta information.

     * See #BaseImporter::GetInfo for the details

     */

    const aiImporterDesc* GetInfo () const override;

    // -------------------------------------------------------------------

    /** Imports the given file into the given scene structure.

    * See BaseImporter::InternReadFile() for details

    */

    void InternReadFile( const std::string& pFile, aiScene* pScene,

        IOSystem* pIOHandler) override;

    // -------------------------------------------------------------------

    /** Import a quake 1 MDL file (IDPO)

    */

    void InternReadFile_Quake1( );

    // -------------------------------------------------------------------

    /** Import a GameStudio A4/A5 file (MDL 3,4,5)

    */

    void InternReadFile_3DGS_MDL345( );

    // -------------------------------------------------------------------

    /** Import a GameStudio A7 file (MDL 7)

    */

    void InternReadFile_3DGS_MDL7( );

    // -------------------------------------------------------------------

    /** Import a Half-Life 1 MDL file

    */

    void InternReadFile_HL1(const std::string& pFile, const uint32_t iMagicWord);

    // -------------------------------------------------------------------

    /** Import a CS:S/HL2 MDL file (not fully implemented)

    */

    AI_WONT_RETURN void InternReadFile_HL2( ) AI_WONT_RETURN_SUFFIX;

    // -------------------------------------------------------------------

    /** Check whether a given position is inside the valid range

     *  Throw a DeadlyImportError if it is not

     * \param szPos Cursor position

     * \param szFile Name of the source file from which the function was called

     * \param iLine Source code line from which the function was called

    */

    void SizeCheck(const void* szPos);

    void SizeCheck(const void* szPos, const char* szFile, unsigned int iLine);

    bool IsPosValid(const void* szPos) const;

    // -------------------------------------------------------------------

    /** Validate the header data structure of a game studio MDL7 file

     * \param pcHeader Input header to be validated

     */

    void ValidateHeader_3DGS_MDL7(const MDL::Header_MDL7* pcHeader);

    // -------------------------------------------------------------------

    /** Validate the header data structure of a Quake 1 model

     * \param pcHeader Input header to be validated

     */

    void ValidateHeader_Quake1(const MDL::Header* pcHeader);

    // -------------------------------------------------------------------

    /** Try to load a  palette from the current directory (colormap.lmp)

     *  If it is not found the default palette of Quake1 is returned

     */

    void SearchPalette(const unsigned char** pszColorMap);

    // -------------------------------------------------------------------

    /** Free a palette created with a previous call to SearchPalette()

     */

    void FreePalette(const unsigned char* pszColorMap);

    // -------------------------------------------------------------------

    /** Load a palletized texture from the file and convert it to 32bpp

    */

    void CreateTextureARGB8_3DGS_MDL3(const unsigned char* szData);

    // -------------------------------------------------------------------

    /** Used to load textures from MDL3/4

     * \param szData Input data

     * \param iType Color data type

     * \param piSkip Receive: Size to skip, in bytes

    */

    void CreateTexture_3DGS_MDL4(const unsigned char* szData,

        unsigned int iType,

        unsigned int* piSkip);

    // -------------------------------------------------------------------

    /** Used to load textures from MDL5

     * \param szData Input data

     * \param iType Color data type

     * \param piSkip Receive: Size to skip, in bytes

    */

    void CreateTexture_3DGS_MDL5(const unsigned char* szData,

        unsigned int iType,

        unsigned int* piSkip);

    // -------------------------------------------------------------------

    /** Checks whether a texture can be replaced with a single color

     * This is useful for all file formats before MDL7 (all those

     * that are not containing material colors separate from textures).

     * MED seems to write dummy 8x8 monochrome images instead.

     * \param pcTexture Input texture

     * \return aiColor.r is set to qnan if the function fails and no

     *   color can be found.

    */

    aiColor4D ReplaceTextureWithColor(const aiTexture* pcTexture);

    // -------------------------------------------------------------------

    /** Converts the absolute texture coordinates in MDL5 files to

     *  relative in a range between 0 and 1

    */

    void CalculateUVCoordinates_MDL5();

    // -------------------------------------------------------------------

    /** Read an UV coordinate from the file. If the file format is not

     * MDL5, the function calculates relative texture coordinates

     * \param vOut Receives the output UV coord

     * \param pcSrc UV coordinate buffer

     * \param UV coordinate index

    */

    void ImportUVCoordinate_3DGS_MDL345( aiVector3D& vOut,

        const MDL::TexCoord_MDL3* pcSrc,

        unsigned int iIndex);

    // -------------------------------------------------------------------

    /** Setup the material properties for Quake and MDL<7 models.

     * These formats don't support more than one material per mesh,

     * therefore the method processes only ONE skin and removes

     * all others.

     */

    void SetupMaterialProperties_3DGS_MDL5_Quake1( );

    // -------------------------------------------------------------------

    /** Parse a skin lump in a MDL7/HMP7 file with all of its features

     *  variant 1: Current cursor position is the beginning of the skin header

     * \param szCurrent Current data pointer

     * \param szCurrentOut Output data pointer

     * \param pcMats Material list for this group. To be filled ...

     */

    void ParseSkinLump_3DGS_MDL7(

        const unsigned char* szCurrent,

        const unsigned char** szCurrentOut,

        std::vector<aiMaterial*>& pcMats);

    // -------------------------------------------------------------------

    /** Parse a skin lump in a MDL7/HMP7 file with all of its features

     *  variant 2: Current cursor position is the beginning of the skin data

     * \param szCurrent Current data pointer

     * \param szCurrentOut Output data pointer

     * \param pcMatOut Output material

     * \param iType header.typ

     * \param iWidth header.width

     * \param iHeight header.height

     */

    void ParseSkinLump_3DGS_MDL7(

        const unsigned char* szCurrent,

        const unsigned char** szCurrentOut,

        aiMaterial* pcMatOut,

        unsigned int iType,

        unsigned int iWidth,

        unsigned int iHeight);

    // -------------------------------------------------------------------

    /** Skip a skin lump in a MDL7/HMP7 file

     * \param szCurrent Current data pointer

     * \param szCurrentOut Output data pointer. Points to the byte just

     * behind the last byte of the skin.

     * \param iType header.typ

     * \param iWidth header.width

     * \param iHeight header.height

     */

    void SkipSkinLump_3DGS_MDL7(const unsigned char* szCurrent,

        const unsigned char** szCurrentOut,

        unsigned int iType,

        unsigned int iWidth,

        unsigned int iHeight);

    // -------------------------------------------------------------------

    /** Parse texture color data for MDL5, MDL6 and MDL7 formats

     * \param szData Current data pointer

     * \param iType type of the texture data. No DDS or external

     * \param piSkip Receive the number of bytes to skip

     * \param pcNew Must point to fully initialized data. Width and

     *        height must be set. If pcNew->pcData is set to UINT_MAX,

     *        piSkip will receive the size of the texture, in bytes, but no

     *        color data will be read.

     */

    void ParseTextureColorData(const unsigned char* szData,

        unsigned int iType,

        unsigned int* piSkip,

        aiTexture* pcNew);

    // -------------------------------------------------------------------

    /** Join two materials / skins. Setup UV source ... etc

     * \param pcMat1 First input material

     * \param pcMat2 Second input material

     * \param pcMatOut Output material instance to be filled. Must be empty

     */

    void JoinSkins_3DGS_MDL7(aiMaterial* pcMat1,

        aiMaterial* pcMat2,

        aiMaterial* pcMatOut);

    // -------------------------------------------------------------------

    /** Add a bone transformation key to an animation

     * \param iTrafo Index of the transformation (always==frame index?)

     * No need to validate this index, it is always valid.

     * \param pcBoneTransforms Bone transformation for this index

     * \param apcOutBones Output bones array

     */

    void AddAnimationBoneTrafoKey_3DGS_MDL7(unsigned int iTrafo,

        const MDL::BoneTransform_MDL7* pcBoneTransforms,

        MDL::IntBone_MDL7** apcBonesOut);

    // -------------------------------------------------------------------

    /** Load the bone list of a MDL7 file

     * \return If the bones could be loaded successfully, a valid

     *   array containing pointers to a temporary bone

     *   representation. nullptr if the bones could not be loaded.

     */

    MDL::IntBone_MDL7** LoadBones_3DGS_MDL7();

    // -------------------------------------------------------------------

    /** Load bone transformation keyframes from a file chunk

     * \param groupInfo -> doc of data structure

     * \param frame -> doc of data structure

     * \param shared -> doc of data structure

     */

    void ParseBoneTrafoKeys_3DGS_MDL7(

        const MDL::IntGroupInfo_MDL7& groupInfo,

        IntFrameInfo_MDL7& frame,

        MDL::IntSharedData_MDL7& shared);

    // -------------------------------------------------------------------

    /** Calculate absolute bone animation matrices for each bone

     * \param apcOutBones Output bones array

     */

    void CalcAbsBoneMatrices_3DGS_MDL7(MDL::IntBone_MDL7** apcOutBones);

    // -------------------------------------------------------------------

    /** Add all bones to the nodegraph (as children of the root node)

     * \param apcBonesOut List of bones

     * \param pcParent Parent node. New nodes will be added to this node

     * \param iParentIndex Index of the parent bone

     */

    void AddBonesToNodeGraph_3DGS_MDL7(const MDL::IntBone_MDL7** apcBonesOut,

        aiNode* pcParent,uint16_t iParentIndex);

    // -------------------------------------------------------------------

    /** Build output animations

     * \param apcBonesOut List of bones

     */

    void BuildOutputAnims_3DGS_MDL7(const MDL::IntBone_MDL7** apcBonesOut);

    // -------------------------------------------------------------------

    /** Handles materials that are just referencing another material

     * There is no test file for this feature, but Conitec's doc

     * say it is used.

     */

    void HandleMaterialReferences_3DGS_MDL7();

    // -------------------------------------------------------------------

    /** Copies only the material that are referenced by at least one

     * mesh to the final output material list. All other materials

     * will be discarded.

     * \param shared -> doc of data structure

     */

    void CopyMaterials_3DGS_MDL7(MDL::IntSharedData_MDL7 &shared);

    // -------------------------------------------------------------------

    /** Process the frame section at the end of a group

     * \param groupInfo -> doc of data structure

     * \param shared -> doc of data structure

     * \param szCurrent Pointer to the start of the frame section

     * \param szCurrentOut Receives a pointer to the first byte of the

     *   next data section.

     * \return false to read no further groups (a small workaround for

     *   some tiny and unsolved problems ... )

     */

    bool ProcessFrames_3DGS_MDL7(const MDL::IntGroupInfo_MDL7& groupInfo,

        MDL::IntGroupData_MDL7& groupData,

        MDL::IntSharedData_MDL7& shared,

        const unsigned char* szCurrent,

        const unsigned char** szCurrentOut);

    // -------------------------------------------------------------------

    /** Sort all faces by their materials. If the mesh is using

     * multiple materials per face (that are blended together) the function

     * might create new materials.

     * \param groupInfo -> doc of data structure

     * \param groupData -> doc of data structure

     * \param splitGroupData -> doc of data structure

     */

    void SortByMaterials_3DGS_MDL7(

        const MDL::IntGroupInfo_MDL7& groupInfo,

        MDL::IntGroupData_MDL7& groupData,

        MDL::IntSplitGroupData_MDL7& splitGroupData);

    // -------------------------------------------------------------------

    /** Read all faces and vertices from a MDL7 group. The function fills

     *  preallocated memory buffers.

     * \param groupInfo -> doc of data structure

     * \param groupData -> doc of data structure

     */

    void ReadFaces_3DGS_MDL7(const MDL::IntGroupInfo_MDL7& groupInfo,

        MDL::IntGroupData_MDL7& groupData);

    // -------------------------------------------------------------------

    /** Generate the final output meshes for a7 models

     * \param groupData -> doc of data structure

     * \param splitGroupData -> doc of data structure

     */

    void GenerateOutputMeshes_3DGS_MDL7(

        MDL::IntGroupData_MDL7& groupData,

        MDL::IntSplitGroupData_MDL7& splitGroupData);

protected:

    /** Configuration option: frame to be loaded */

    unsigned int configFrameID;

    /** Configuration option: palette to be used to decode palletized images*/

    std::string configPalette;

    /** Buffer to hold the loaded file */

    unsigned char* mBuffer;

    /** For GameStudio MDL files: The number in the magic word, either 3,4 or 5

     * (MDL7 doesn't need this, the format has a separate loader) */

    unsigned int iGSFileVersion;

    /** Output I/O handler. used to load external lmp files */

    IOSystem* mIOHandler;

    /** Output scene to be filled */

    aiScene* pScene;

    /** Size of the input file in bytes */

    unsigned int iFileSize;

    /* Configuration for HL1 MDL */

    HalfLife::HL1ImportSettings mHL1ImportSettings;

};

} // end of namespace Assimp

#endif // AI_3DSIMPORTER_H_INC