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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
