move 3rd-party librarys into libs/ and add built-in honeysuckle

4 files changed, 934 insertions, 0 deletions

diff --git a/libs/assimp/code/AssetLib/HMP/HMPFileData.h b/libs/assimp/code/AssetLib/HMP/HMPFileData.h
new file mode 100644
index 0000000..b297136
--- /dev/null
+++ b/libs/assimp/code/AssetLib/HMP/HMPFileData.h
@@ -0,0 +1,137 @@
+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2022, assimp team
+
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the
+following conditions are met:
+
+* Redistributions of source code must retain the above
+  copyright notice, this list of conditions and the
+  following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+  copyright notice, this list of conditions and the
+  following disclaimer in the documentation and/or other
+  materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+  contributors may be used to endorse or promote products
+  derived from this software without specific prior
+  written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+----------------------------------------------------------------------
+*/
+//!
+//! @file Data structures for the 3D Game Studio Heightmap format (HMP)
+//!
+
+namespace Assimp    {
+namespace HMP   {
+
+#include <assimp/Compiler/pushpack1.h>
+#include <stdint.h>
+
+// to make it easier for us, we test the magic word against both "endianesses"
+#define AI_HMP_MAGIC_NUMBER_BE_4    AI_MAKE_MAGIC("HMP4")
+#define AI_HMP_MAGIC_NUMBER_LE_4    AI_MAKE_MAGIC("4PMH")
+
+#define AI_HMP_MAGIC_NUMBER_BE_5    AI_MAKE_MAGIC("HMP5")
+#define AI_HMP_MAGIC_NUMBER_LE_5    AI_MAKE_MAGIC("5PMH")
+
+#define AI_HMP_MAGIC_NUMBER_BE_7    AI_MAKE_MAGIC("HMP7")
+#define AI_HMP_MAGIC_NUMBER_LE_7    AI_MAKE_MAGIC("7PMH")
+
+// ---------------------------------------------------------------------------
+/** Data structure for the header of a HMP5 file.
+ *  This is also used by HMP4 and HMP7, but with modifications
+*/
+struct Header_HMP5
+{
+    int8_t  ident[4]; // "HMP5"
+    int32_t     version;
+
+    // ignored
+    float   scale[3];
+    float   scale_origin[3];
+    float   boundingradius;
+
+    //! Size of one triangle in x direction
+    float   ftrisize_x;
+    //! Size of one triangle in y direction
+    float   ftrisize_y;
+    //! Number of vertices in x direction
+    float   fnumverts_x;
+
+    //! Number of skins in the file
+    int32_t     numskins;
+
+    // can ignore this?
+    int32_t     skinwidth;
+    int32_t     skinheight;
+
+    //!Number of vertices in the file
+    int32_t     numverts;
+
+    // ignored and zero
+    int32_t     numtris;
+
+    //! only one supported ...
+    int32_t     numframes;
+
+    //! Always 0 ...
+    int32_t     num_stverts;
+    int32_t     flags;
+    float   size;
+} PACK_STRUCT;
+
+// ---------------------------------------------------------------------------
+/** Data structure for a terrain vertex in a HMP4 file
+*/
+struct Vertex_HMP4
+{
+    uint16_t p_pos[3];
+    uint8_t normals162index;
+    uint8_t pad;
+} PACK_STRUCT;
+
+// ---------------------------------------------------------------------------
+/** Data structure for a terrain vertex in a HMP5 file
+*/
+struct Vertex_HMP5
+{
+    uint16_t z;
+    uint8_t normals162index;
+    uint8_t pad;
+} PACK_STRUCT;
+
+// ---------------------------------------------------------------------------
+/** Data structure for a terrain vertex in a HMP7 file
+*/
+struct Vertex_HMP7
+{
+    uint16_t     z;
+    int8_t normal_x,normal_y;
+} PACK_STRUCT;
+
+#include <assimp/Compiler/poppack1.h>
+
+} //! namespace HMP
+} //! namespace Assimp
diff --git a/libs/assimp/code/AssetLib/HMP/HMPLoader.cpp b/libs/assimp/code/AssetLib/HMP/HMPLoader.cpp
new file mode 100644
index 0000000..1625cb3
--- /dev/null
+++ b/libs/assimp/code/AssetLib/HMP/HMPLoader.cpp
@@ -0,0 +1,508 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2022, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+  copyright notice, this list of conditions and the
+  following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+  copyright notice, this list of conditions and the
+  following disclaimer in the documentation and/or other
+  materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+  contributors may be used to endorse or promote products
+  derived from this software without specific prior
+  written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+/** @file Implementation of the MDL importer class */
+
+#ifndef ASSIMP_BUILD_NO_HMP_IMPORTER
+
+// internal headers
+#include "AssetLib/HMP/HMPLoader.h"
+#include "AssetLib/MD2/MD2FileData.h"
+
+#include <assimp/StringUtils.h>
+#include <assimp/importerdesc.h>
+#include <assimp/scene.h>
+#include <assimp/DefaultLogger.hpp>
+#include <assimp/IOSystem.hpp>
+
+#include <memory>
+
+using namespace Assimp;
+
+static const aiImporterDesc desc = {
+    "3D GameStudio Heightmap (HMP) Importer",
+    "",
+    "",
+    "",
+    aiImporterFlags_SupportBinaryFlavour,
+    0,
+    0,
+    0,
+    0,
+    "hmp"
+};
+
+// ------------------------------------------------------------------------------------------------
+// Constructor to be privately used by Importer
+HMPImporter::HMPImporter() {
+    // nothing to do here
+}
+
+// ------------------------------------------------------------------------------------------------
+// Destructor, private as well
+HMPImporter::~HMPImporter() {
+    // nothing to do here
+}
+
+// ------------------------------------------------------------------------------------------------
+// Returns whether the class can handle the format of the given file.
+bool HMPImporter::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool /*checkSig*/) const {
+    static const uint32_t tokens[] = {
+        AI_HMP_MAGIC_NUMBER_LE_4,
+        AI_HMP_MAGIC_NUMBER_LE_5,
+        AI_HMP_MAGIC_NUMBER_LE_7
+    };
+    return CheckMagicToken(pIOHandler, pFile, tokens, AI_COUNT_OF(tokens));
+}
+
+// ------------------------------------------------------------------------------------------------
+// Get list of all file extensions that are handled by this loader
+const aiImporterDesc *HMPImporter::GetInfo() const {
+    return &desc;
+}
+
+// ------------------------------------------------------------------------------------------------
+// Imports the given file into the given scene structure.
+void HMPImporter::InternReadFile(const std::string &pFile,
+        aiScene *_pScene, IOSystem *_pIOHandler) {
+    pScene = _pScene;
+    mIOHandler = _pIOHandler;
+    std::unique_ptr<IOStream> file(mIOHandler->Open(pFile));
+
+    // Check whether we can read from the file
+    if (file.get() == nullptr) {
+        throw DeadlyImportError("Failed to open HMP file ", pFile, ".");
+    }
+
+    // Check whether the HMP file is large enough to contain
+    // at least the file header
+    const size_t fileSize = file->FileSize();
+    if (fileSize < 50)
+        throw DeadlyImportError("HMP File is too small.");
+
+    // Allocate storage and copy the contents of the file to a memory buffer
+    mBuffer = new uint8_t[fileSize];
+    file->Read((void *)mBuffer, 1, fileSize);
+    iFileSize = (unsigned int)fileSize;
+
+    // Determine the file subtype and call the appropriate member function
+    const uint32_t iMagic = *((uint32_t *)this->mBuffer);
+
+    // HMP4 format
+    if (AI_HMP_MAGIC_NUMBER_LE_4 == iMagic ||
+            AI_HMP_MAGIC_NUMBER_BE_4 == iMagic) {
+        ASSIMP_LOG_DEBUG("HMP subtype: 3D GameStudio A4, magic word is HMP4");
+        InternReadFile_HMP4();
+    }
+    // HMP5 format
+    else if (AI_HMP_MAGIC_NUMBER_LE_5 == iMagic ||
+             AI_HMP_MAGIC_NUMBER_BE_5 == iMagic) {
+        ASSIMP_LOG_DEBUG("HMP subtype: 3D GameStudio A5, magic word is HMP5");
+        InternReadFile_HMP5();
+    }
+    // HMP7 format
+    else if (AI_HMP_MAGIC_NUMBER_LE_7 == iMagic ||
+             AI_HMP_MAGIC_NUMBER_BE_7 == iMagic) {
+        ASSIMP_LOG_DEBUG("HMP subtype: 3D GameStudio A7, magic word is HMP7");
+        InternReadFile_HMP7();
+    } else {
+        // Print the magic word to the logger
+        std::string szBuffer = ai_str_toprintable((const char *)&iMagic, sizeof(iMagic));
+
+        delete[] mBuffer;
+        mBuffer = nullptr;
+
+        // We're definitely unable to load this file
+        throw DeadlyImportError("Unknown HMP subformat ", pFile,
+                                ". Magic word (", szBuffer, ") is not known");
+    }
+
+    // Set the AI_SCENE_FLAGS_TERRAIN bit
+    pScene->mFlags |= AI_SCENE_FLAGS_TERRAIN;
+
+    delete[] mBuffer;
+    mBuffer = nullptr;
+}
+
+// ------------------------------------------------------------------------------------------------
+void HMPImporter::ValidateHeader_HMP457() {
+    const HMP::Header_HMP5 *const pcHeader = (const HMP::Header_HMP5 *)mBuffer;
+
+    if (120 > iFileSize) {
+        throw DeadlyImportError("HMP file is too small (header size is "
+                                "120 bytes, this file is smaller)");
+    }
+
+    if (!pcHeader->ftrisize_x || !pcHeader->ftrisize_y)
+        throw DeadlyImportError("Size of triangles in either  x or y direction is zero");
+
+    if (pcHeader->fnumverts_x < 1.0f || (pcHeader->numverts / pcHeader->fnumverts_x) < 1.0f)
+        throw DeadlyImportError("Number of triangles in either x or y direction is zero");
+
+    if (!pcHeader->numframes)
+        throw DeadlyImportError("There are no frames. At least one should be there");
+}
+
+// ------------------------------------------------------------------------------------------------
+void HMPImporter::InternReadFile_HMP4() {
+    throw DeadlyImportError("HMP4 is currently not supported");
+}
+
+// ------------------------------------------------------------------------------------------------
+void HMPImporter::InternReadFile_HMP5() {
+    // read the file header and skip everything to byte 84
+    const HMP::Header_HMP5 *pcHeader = (const HMP::Header_HMP5 *)mBuffer;
+    const unsigned char *szCurrent = (const unsigned char *)(mBuffer + 84);
+    ValidateHeader_HMP457();
+
+    // generate an output mesh
+    pScene->mNumMeshes = 1;
+    pScene->mMeshes = new aiMesh *[1];
+    aiMesh *pcMesh = pScene->mMeshes[0] = new aiMesh();
+
+    pcMesh->mMaterialIndex = 0;
+    pcMesh->mVertices = new aiVector3D[pcHeader->numverts];
+    pcMesh->mNormals = new aiVector3D[pcHeader->numverts];
+
+    const unsigned int height = (unsigned int)(pcHeader->numverts / pcHeader->fnumverts_x);
+    const unsigned int width = (unsigned int)pcHeader->fnumverts_x;
+
+    // generate/load a material for the terrain
+    CreateMaterial(szCurrent, &szCurrent);
+
+    // goto offset 120, I don't know why ...
+    // (fixme) is this the frame header? I assume yes since it starts with 2.
+    szCurrent += 36;
+    SizeCheck(szCurrent + sizeof(const HMP::Vertex_HMP7) * height * width);
+
+    // now load all vertices from the file
+    aiVector3D *pcVertOut = pcMesh->mVertices;
+    aiVector3D *pcNorOut = pcMesh->mNormals;
+    const HMP::Vertex_HMP5 *src = (const HMP::Vertex_HMP5 *)szCurrent;
+    for (unsigned int y = 0; y < height; ++y) {
+        for (unsigned int x = 0; x < width; ++x) {
+            pcVertOut->x = x * pcHeader->ftrisize_x;
+            pcVertOut->y = y * pcHeader->ftrisize_y;
+            pcVertOut->z = (((float)src->z / 0xffff) - 0.5f) * pcHeader->ftrisize_x * 8.0f;
+            MD2::LookupNormalIndex(src->normals162index, *pcNorOut);
+            ++pcVertOut;
+            ++pcNorOut;
+            ++src;
+        }
+    }
+
+    // generate texture coordinates if necessary
+    if (pcHeader->numskins)
+        GenerateTextureCoords(width, height);
+
+    // now build a list of faces
+    CreateOutputFaceList(width, height);
+
+    // there is no nodegraph in HMP files. Simply assign the one mesh
+    // (no, not the one ring) to the root node
+    pScene->mRootNode = new aiNode();
+    pScene->mRootNode->mName.Set("terrain_root");
+    pScene->mRootNode->mNumMeshes = 1;
+    pScene->mRootNode->mMeshes = new unsigned int[1];
+    pScene->mRootNode->mMeshes[0] = 0;
+}
+
+// ------------------------------------------------------------------------------------------------
+void HMPImporter::InternReadFile_HMP7() {
+    // read the file header and skip everything to byte 84
+    const HMP::Header_HMP5 *const pcHeader = (const HMP::Header_HMP5 *)mBuffer;
+    const unsigned char *szCurrent = (const unsigned char *)(mBuffer + 84);
+    ValidateHeader_HMP457();
+
+    // generate an output mesh
+    pScene->mNumMeshes = 1;
+    pScene->mMeshes = new aiMesh *[1];
+    aiMesh *pcMesh = pScene->mMeshes[0] = new aiMesh();
+
+    pcMesh->mMaterialIndex = 0;
+    pcMesh->mVertices = new aiVector3D[pcHeader->numverts];
+    pcMesh->mNormals = new aiVector3D[pcHeader->numverts];
+
+    const unsigned int height = (unsigned int)(pcHeader->numverts / pcHeader->fnumverts_x);
+    const unsigned int width = (unsigned int)pcHeader->fnumverts_x;
+
+    // generate/load a material for the terrain
+    CreateMaterial(szCurrent, &szCurrent);
+
+    // goto offset 120, I don't know why ...
+    // (fixme) is this the frame header? I assume yes since it starts with 2.
+    szCurrent += 36;
+
+    SizeCheck(szCurrent + sizeof(const HMP::Vertex_HMP7) * height * width);
+
+    // now load all vertices from the file
+    aiVector3D *pcVertOut = pcMesh->mVertices;
+    ai_assert(pcVertOut != nullptr);
+    aiVector3D *pcNorOut = pcMesh->mNormals;
+    ai_assert(pcNorOut != nullptr);
+    const HMP::Vertex_HMP7 *src = (const HMP::Vertex_HMP7 *)szCurrent;
+    for (unsigned int y = 0; y < height; ++y) {
+        for (unsigned int x = 0; x < width; ++x) {
+            pcVertOut->x = x * pcHeader->ftrisize_x;
+            pcVertOut->y = y * pcHeader->ftrisize_y;
+
+            // FIXME: What exctly is the correct scaling factor to use?
+            // possibly pcHeader->scale_origin[2] in combination with a
+            // signed interpretation of src->z?
+            pcVertOut->z = (((float)src->z / 0xffff) - 0.5f) * pcHeader->ftrisize_x * 8.0f;
+
+            pcNorOut->x = ((float)src->normal_x / 0x80); // * pcHeader->scale_origin[0];
+            pcNorOut->y = ((float)src->normal_y / 0x80); // * pcHeader->scale_origin[1];
+            pcNorOut->z = 1.0f;
+            pcNorOut->Normalize();
+
+            ++pcVertOut;
+            ++pcNorOut;
+            ++src;
+        }
+    }
+
+    // generate texture coordinates if necessary
+    if (pcHeader->numskins) GenerateTextureCoords(width, height);
+
+    // now build a list of faces
+    CreateOutputFaceList(width, height);
+
+    // there is no nodegraph in HMP files. Simply assign the one mesh
+    // (no, not the One Ring) to the root node
+    pScene->mRootNode = new aiNode();
+    pScene->mRootNode->mName.Set("terrain_root");
+    pScene->mRootNode->mNumMeshes = 1;
+    pScene->mRootNode->mMeshes = new unsigned int[1];
+    pScene->mRootNode->mMeshes[0] = 0;
+}
+
+// ------------------------------------------------------------------------------------------------
+void HMPImporter::CreateMaterial(const unsigned char *szCurrent,
+        const unsigned char **szCurrentOut) {
+    aiMesh *const pcMesh = pScene->mMeshes[0];
+    const HMP::Header_HMP5 *const pcHeader = (const HMP::Header_HMP5 *)mBuffer;
+
+    // we don't need to generate texture coordinates if
+    // we have no textures in the file ...
+    if (pcHeader->numskins) {
+        pcMesh->mTextureCoords[0] = new aiVector3D[pcHeader->numverts];
+        pcMesh->mNumUVComponents[0] = 2;
+
+        // now read the first skin and skip all others
+        ReadFirstSkin(pcHeader->numskins, szCurrent, &szCurrent);
+        *szCurrentOut = szCurrent;
+        return;
+    } 
+
+    // generate a default material
+    const int iMode = (int)aiShadingMode_Gouraud;
+    aiMaterial *pcHelper = new aiMaterial();
+    pcHelper->AddProperty<int>(&iMode, 1, AI_MATKEY_SHADING_MODEL);
+
+    aiColor3D clr;
+    clr.b = clr.g = clr.r = 0.6f;
+    pcHelper->AddProperty<aiColor3D>(&clr, 1, AI_MATKEY_COLOR_DIFFUSE);
+    pcHelper->AddProperty<aiColor3D>(&clr, 1, AI_MATKEY_COLOR_SPECULAR);
+
+    clr.b = clr.g = clr.r = 0.05f;
+    pcHelper->AddProperty<aiColor3D>(&clr, 1, AI_MATKEY_COLOR_AMBIENT);
+
+    aiString szName;
+    szName.Set(AI_DEFAULT_MATERIAL_NAME);
+    pcHelper->AddProperty(&szName, AI_MATKEY_NAME);
+
+    // add the material to the scene
+    pScene->mNumMaterials = 1;
+    pScene->mMaterials = new aiMaterial *[1];
+    pScene->mMaterials[0] = pcHelper;
+    *szCurrentOut = szCurrent;
+}
+
+// ------------------------------------------------------------------------------------------------
+void HMPImporter::CreateOutputFaceList(unsigned int width, unsigned int height) {
+    aiMesh *const pcMesh = this->pScene->mMeshes[0];
+
+    // Allocate enough storage
+    pcMesh->mNumFaces = (width - 1) * (height - 1);
+    pcMesh->mFaces = new aiFace[pcMesh->mNumFaces];
+
+    pcMesh->mNumVertices = pcMesh->mNumFaces * 4;
+    aiVector3D *pcVertices = new aiVector3D[pcMesh->mNumVertices];
+    aiVector3D *pcNormals = new aiVector3D[pcMesh->mNumVertices];
+
+    aiFace *pcFaceOut(pcMesh->mFaces);
+    aiVector3D *pcVertOut = pcVertices;
+    aiVector3D *pcNorOut = pcNormals;
+
+    aiVector3D *pcUVs = pcMesh->mTextureCoords[0] ? new aiVector3D[pcMesh->mNumVertices] : nullptr;
+    aiVector3D *pcUVOut(pcUVs);
+
+    // Build the terrain square
+    const unsigned int upperBound = pcMesh->mNumVertices;
+    unsigned int iCurrent = 0;
+    for (unsigned int y = 0; y < height - 1; ++y) {
+        const size_t offset0 = y * width;
+        const size_t offset1 = (y + 1) * width;
+        for (unsigned int x = 0; x < width - 1; ++x, ++pcFaceOut) {
+            pcFaceOut->mNumIndices = 4;
+            pcFaceOut->mIndices = new unsigned int[4];
+            if ((offset0 + x + 1) >= upperBound){
+                continue;
+            }
+            if ((offset1 + x + 1) >= upperBound){
+                continue;
+            }
+
+            *pcVertOut++ = pcMesh->mVertices[offset0 + x];
+            *pcVertOut++ = pcMesh->mVertices[offset1 + x];
+            *pcVertOut++ = pcMesh->mVertices[offset1 + x + 1];
+            *pcVertOut++ = pcMesh->mVertices[offset0 + x + 1];
+
+            *pcNorOut++ = pcMesh->mNormals[offset0 + x];
+            *pcNorOut++ = pcMesh->mNormals[offset1 + x];
+            *pcNorOut++ = pcMesh->mNormals[offset1 + x + 1];
+            *pcNorOut++ = pcMesh->mNormals[offset0 + x + 1];
+
+            if (pcMesh->mTextureCoords[0]) {
+                *pcUVOut++ = pcMesh->mTextureCoords[0][offset0 + x];
+                *pcUVOut++ = pcMesh->mTextureCoords[0][offset1 + x];
+                *pcUVOut++ = pcMesh->mTextureCoords[0][offset1 + x + 1];
+                *pcUVOut++ = pcMesh->mTextureCoords[0][offset0 + x + 1];
+            }
+
+            for (unsigned int i = 0; i < 4; ++i)
+                pcFaceOut->mIndices[i] = iCurrent++;
+        }
+    }
+    delete[] pcMesh->mVertices;
+    pcMesh->mVertices = pcVertices;
+
+    delete[] pcMesh->mNormals;
+    pcMesh->mNormals = pcNormals;
+
+    if (pcMesh->mTextureCoords[0]) {
+        delete[] pcMesh->mTextureCoords[0];
+        pcMesh->mTextureCoords[0] = pcUVs;
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+void HMPImporter::ReadFirstSkin(unsigned int iNumSkins, const unsigned char *szCursor,
+        const unsigned char **szCursorOut) {
+    ai_assert(0 != iNumSkins);
+    ai_assert(nullptr != szCursor);
+
+    // read the type of the skin ...
+    // sometimes we need to skip 12 bytes here, I don't know why ...
+    uint32_t iType = *((uint32_t *)szCursor);
+    szCursor += sizeof(uint32_t);
+    if (0 == iType) {
+        szCursor += sizeof(uint32_t) * 2;
+        iType = *((uint32_t *)szCursor);
+        szCursor += sizeof(uint32_t);
+        if (!iType)
+            throw DeadlyImportError("Unable to read HMP7 skin chunk");
+    }
+    // read width and height
+    uint32_t iWidth = *((uint32_t *)szCursor);
+    szCursor += sizeof(uint32_t);
+    uint32_t iHeight = *((uint32_t *)szCursor);
+    szCursor += sizeof(uint32_t);
+
+    // allocate an output material
+    aiMaterial *pcMat = new aiMaterial();
+
+    // read the skin, this works exactly as for MDL7
+    ParseSkinLump_3DGS_MDL7(szCursor, &szCursor,
+            pcMat, iType, iWidth, iHeight);
+
+    // now we need to skip any other skins ...
+    for (unsigned int i = 1; i < iNumSkins; ++i) {
+        SizeCheck(szCursor + 3 * sizeof(uint32_t));
+        iType = *((uint32_t *)szCursor);
+        szCursor += sizeof(uint32_t);
+        iWidth = *((uint32_t *)szCursor);
+        szCursor += sizeof(uint32_t);
+        iHeight = *((uint32_t *)szCursor);
+        szCursor += sizeof(uint32_t);
+
+        SkipSkinLump_3DGS_MDL7(szCursor, &szCursor, iType, iWidth, iHeight);
+        SizeCheck(szCursor);
+    }
+
+    // setup the material ...
+    pScene->mNumMaterials = 1;
+    pScene->mMaterials = new aiMaterial *[1];
+    pScene->mMaterials[0] = pcMat;
+
+    *szCursorOut = szCursor;
+}
+
+// ------------------------------------------------------------------------------------------------
+// Generate proepr texture coords
+void HMPImporter::GenerateTextureCoords(const unsigned int width, const unsigned int height) {
+    ai_assert(nullptr != pScene->mMeshes);
+    ai_assert(nullptr != pScene->mMeshes[0]);
+    ai_assert(nullptr != pScene->mMeshes[0]->mTextureCoords[0]);
+
+    aiVector3D *uv = pScene->mMeshes[0]->mTextureCoords[0];
+    if (uv == nullptr) {
+        return;
+    }
+    
+    if (height == 0.0f || width == 0.0) {
+        return;
+    }
+    
+    const float fY = (1.0f / height) + (1.0f / height) / height;
+    const float fX = (1.0f / width) + (1.0f / width) / width;
+
+    for (unsigned int y = 0; y < height; ++y) {
+        for (unsigned int x = 0; x < width; ++x, ++uv) {
+            uv->y = fY * y;
+            uv->x = fX * x;
+            uv->z = 0.0f;
+        }
+    }
+}
+
+#endif // !! ASSIMP_BUILD_NO_HMP_IMPORTER
diff --git a/libs/assimp/code/AssetLib/HMP/HMPLoader.h b/libs/assimp/code/AssetLib/HMP/HMPLoader.h
new file mode 100644
index 0000000..95ce0a9
--- /dev/null
+++ b/libs/assimp/code/AssetLib/HMP/HMPLoader.h
@@ -0,0 +1,140 @@
+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2022, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the
+following conditions are met:
+
+* Redistributions of source code must retain the above
+  copyright notice, this list of conditions and the
+  following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+  copyright notice, this list of conditions and the
+  following disclaimer in the documentation and/or other
+  materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+  contributors may be used to endorse or promote products
+  derived from this software without specific prior
+  written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+----------------------------------------------------------------------
+*/
+/** @file  HMPLoader.h
+ *  @brief Declaration of the HMP importer class
+ */
+#pragma once
+#ifndef AI_HMPLOADER_H_INCLUDED
+#define AI_HMPLOADER_H_INCLUDED
+
+#include <assimp/BaseImporter.h>
+
+// internal headers
+#include "AssetLib/HMP/HMPFileData.h"
+#include "AssetLib/MDL/MDLLoader.h"
+
+namespace Assimp {
+using namespace HMP;
+
+// ---------------------------------------------------------------------------
+/** Used to load 3D GameStudio HMP files (terrains)
+*/
+class HMPImporter : public MDLImporter {
+public:
+    HMPImporter();
+    ~HMPImporter() override;
+
+    // -------------------------------------------------------------------
+    /** 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;
+
+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 HMP4 file
+    */
+    void InternReadFile_HMP4();
+
+    // -------------------------------------------------------------------
+    /** Import a HMP5 file
+    */
+    void InternReadFile_HMP5();
+
+    // -------------------------------------------------------------------
+    /** Import a HMP7 file
+    */
+    void InternReadFile_HMP7();
+
+    // -------------------------------------------------------------------
+    /** Validate a HMP 5,4,7 file header
+    */
+    void ValidateHeader_HMP457();
+
+    // -------------------------------------------------------------------
+    /** Try to load one material from the file, if this fails create
+     * a default material
+    */
+    void CreateMaterial(const unsigned char *szCurrent,
+            const unsigned char **szCurrentOut);
+
+    // -------------------------------------------------------------------
+    /** Build a list of output faces and vertices. The function
+     *  triangulates the height map read from the file
+     * \param width Width of the height field
+     * \param width Height of the height field
+    */
+    void CreateOutputFaceList(unsigned int width, unsigned int height);
+
+    // -------------------------------------------------------------------
+    /** Generate planar texture coordinates for a terrain
+     * \param width Width of the terrain, in vertices
+     * \param height Height of the terrain, in vertices
+    */
+    void GenerateTextureCoords(const unsigned int width,
+            const unsigned int height);
+
+    // -------------------------------------------------------------------
+    /** Read the first skin from the file and skip all others ...
+     *  \param iNumSkins Number of skins in the file
+     *  \param szCursor Position of the first skin (offset 84)
+    */
+    void ReadFirstSkin(unsigned int iNumSkins, const unsigned char *szCursor,
+            const unsigned char **szCursorOut);
+};
+
+} // end of namespace Assimp
+
+#endif // AI_HMPIMPORTER_H_INC
diff --git a/libs/assimp/code/AssetLib/HMP/HalfLifeFileData.h b/libs/assimp/code/AssetLib/HMP/HalfLifeFileData.h
new file mode 100644
index 0000000..f47862b
--- /dev/null
+++ b/libs/assimp/code/AssetLib/HMP/HalfLifeFileData.h
@@ -0,0 +1,149 @@
+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2022, assimp team
+
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the
+following conditions are met:
+
+* Redistributions of source code must retain the above
+  copyright notice, this list of conditions and the
+  following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+  copyright notice, this list of conditions and the
+  following disclaimer in the documentation and/or other
+  materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+  contributors may be used to endorse or promote products
+  derived from this software without specific prior
+  written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+----------------------------------------------------------------------
+*/
+
+
+//
+//! @file Definition of in-memory structures for the HL2 MDL file format
+//  and for the HalfLife text format (SMD)
+//
+// The specification has been taken from various sources on the internet.
+
+
+#ifndef AI_MDLFILEHELPER2_H_INC
+#define AI_MDLFILEHELPER2_H_INC
+
+#include <assimp/Compiler/pushpack1.h>
+
+namespace Assimp    {
+namespace MDL   {
+
+// magic bytes used in Half Life 2 MDL models
+#define AI_MDL_MAGIC_NUMBER_BE_HL2a AI_MAKE_MAGIC("IDST")
+#define AI_MDL_MAGIC_NUMBER_LE_HL2a AI_MAKE_MAGIC("TSDI")
+#define AI_MDL_MAGIC_NUMBER_BE_HL2b AI_MAKE_MAGIC("IDSQ")
+#define AI_MDL_MAGIC_NUMBER_LE_HL2b AI_MAKE_MAGIC("QSDI")
+
+// ---------------------------------------------------------------------------
+/** \struct Header_HL2
+ *  \brief Data structure for the HL2 main header
+ */
+// ---------------------------------------------------------------------------
+struct Header_HL2 {
+    //! magic number: "IDST"/"IDSQ"
+    char    ident[4];
+
+    //! Version number
+    int32_t version;
+
+    //! Original file name in pak ?
+    char        name[64];
+
+    //! Length of file name/length of file?
+    int32_t     length;
+
+    //! For viewer, ignored
+    aiVector3D      eyeposition;
+    aiVector3D      min;
+    aiVector3D      max;
+
+    //! AABB of the model
+    aiVector3D      bbmin;
+    aiVector3D      bbmax;
+
+    // File flags
+    int32_t         flags;
+
+    //! NUmber of bones contained in the file
+    int32_t         numbones;
+    int32_t         boneindex;
+
+    //! Number of bone controllers for bone animation
+    int32_t         numbonecontrollers;
+    int32_t         bonecontrollerindex;
+
+    //! More bounding boxes ...
+    int32_t         numhitboxes;
+    int32_t         hitboxindex;
+
+    //! Animation sequences in the file
+    int32_t         numseq;
+    int32_t         seqindex;
+
+    //! Loaded sequences. Ignored
+    int32_t         numseqgroups;
+    int32_t         seqgroupindex;
+
+    //! Raw texture data
+    int32_t         numtextures;
+    int32_t         textureindex;
+    int32_t         texturedataindex;
+
+    //! Number of skins (=textures?)
+    int32_t         numskinref;
+    int32_t         numskinfamilies;
+    int32_t         skinindex;
+
+    //! Number of parts
+    int32_t         numbodyparts;
+    int32_t         bodypartindex;
+
+    //! attachable points for gameplay and physics
+    int32_t         numattachments;
+    int32_t         attachmentindex;
+
+    //! Table of sound effects associated with the model
+    int32_t         soundtable;
+    int32_t         soundindex;
+    int32_t         soundgroups;
+    int32_t         soundgroupindex;
+
+    //! Number of animation transitions
+    int32_t         numtransitions;
+    int32_t         transitionindex;
+} /* PACK_STRUCT */;
+
+#include <assimp/Compiler/poppack1.h>
+
+}
+} // end namespaces
+
+#endif // ! AI_MDLFILEHELPER2_H_INC