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diff --git a/libs/assimp/code/Common/Bitmap.cpp b/libs/assimp/code/Common/Bitmap.cpp
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+/*
+---------------------------------------------------------------------------
+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 Bitmap.cpp
+ *  @brief Defines bitmap format helper for textures
+ *
+ * Used for file formats which embed their textures into the model file.
+ */
+
+#include <assimp/Bitmap.h>
+#include <assimp/ByteSwapper.h>
+#include <assimp/texture.h>
+#include <assimp/IOStream.hpp>
+
+namespace Assimp {
+
+bool Bitmap::Save(aiTexture *texture, IOStream *file) {
+    if (file == nullptr) {
+        return false;
+    }
+
+    Header header;
+    DIB dib;
+    dib.size = DIB::dib_size;
+    dib.width = texture->mWidth;
+    dib.height = texture->mHeight;
+    dib.planes = 1;
+    dib.bits_per_pixel = 8 * mBytesPerPixel;
+    dib.compression = 0;
+    dib.image_size = (((dib.width * mBytesPerPixel) + 3) & 0x0000FFFC) * dib.height;
+    dib.x_resolution = 0;
+    dib.y_resolution = 0;
+    dib.nb_colors = 0;
+    dib.nb_important_colors = 0;
+
+    header.type = 0x4D42; // 'BM'
+    header.offset = Header::header_size + DIB::dib_size;
+    header.size = header.offset + dib.image_size;
+    header.reserved1 = 0;
+    header.reserved2 = 0;
+
+    WriteHeader(header, file);
+    WriteDIB(dib, file);
+    WriteData(texture, file);
+
+    return true;
+}
+
+template <typename T>
+inline std::size_t Copy(uint8_t *data, const T &field) {
+#ifdef AI_BUILD_BIG_ENDIAN
+    T field_swapped = AI_BE(field);
+    std::memcpy(data, &field_swapped, sizeof(field));
+    return sizeof(field);
+#else
+    std::memcpy(data, &AI_BE(field), sizeof(field));
+    return sizeof(field);
+#endif
+}
+
+void Bitmap::WriteHeader(Header &header, IOStream *file) {
+    uint8_t data[Header::header_size];
+
+    std::size_t offset = 0;
+
+    offset += Copy(&data[offset], header.type);
+    offset += Copy(&data[offset], header.size);
+    offset += Copy(&data[offset], header.reserved1);
+    offset += Copy(&data[offset], header.reserved2);
+    Copy(&data[offset], header.offset);
+
+    file->Write(data, Header::header_size, 1);
+}
+
+void Bitmap::WriteDIB(DIB &dib, IOStream *file) {
+    uint8_t data[DIB::dib_size];
+
+    std::size_t offset = 0;
+
+    offset += Copy(&data[offset], dib.size);
+    offset += Copy(&data[offset], dib.width);
+    offset += Copy(&data[offset], dib.height);
+    offset += Copy(&data[offset], dib.planes);
+    offset += Copy(&data[offset], dib.bits_per_pixel);
+    offset += Copy(&data[offset], dib.compression);
+    offset += Copy(&data[offset], dib.image_size);
+    offset += Copy(&data[offset], dib.x_resolution);
+    offset += Copy(&data[offset], dib.y_resolution);
+    offset += Copy(&data[offset], dib.nb_colors);
+    Copy(&data[offset], dib.nb_important_colors);
+
+    file->Write(data, DIB::dib_size, 1);
+}
+
+void Bitmap::WriteData(aiTexture *texture, IOStream *file) {
+    static const std::size_t padding_offset = 4;
+    static const uint8_t padding_data[padding_offset] = { 0x0, 0x0, 0x0, 0x0 };
+
+    unsigned int padding = (padding_offset - ((mBytesPerPixel * texture->mWidth) % padding_offset)) % padding_offset;
+    uint8_t pixel[mBytesPerPixel];
+
+    for (std::size_t i = 0; i < texture->mHeight; ++i) {
+        for (std::size_t j = 0; j < texture->mWidth; ++j) {
+            const aiTexel &texel = texture->pcData[(texture->mHeight - i - 1) * texture->mWidth + j]; // Bitmap files are stored in bottom-up format
+
+            pixel[0] = texel.r;
+            pixel[1] = texel.g;
+            pixel[2] = texel.b;
+            pixel[3] = texel.a;
+
+            file->Write(pixel, mBytesPerPixel, 1);
+        }
+
+        file->Write(padding_data, padding, 1);
+    }
+}
+
+} // namespace Assimp