Add separate textures flag.

Don't convert tga to png/jpg if the texture is already converted

src/FBX2glTF.cpp

@@ -51,6 +51,10 @@ int main(int argc, char* argv[]) {
       "-e,--embed",
       gltfOptions.embedResources,
       "Inline buffers as data:// URIs within generated non-binary glTF.");
+
+  app.add_flag(
+      "-t,--separate-textures", gltfOptions.separateTextures, "Write texture files out separately");
+
   app.add_flag("-b,--binary", gltfOptions.outputBinary, "Output a single binary format .glb file.");
 
   app.add_option(
@@ -321,6 +325,7 @@ int main(int argc, char* argv[]) {
 
   if (gltfOptions.outputBinary) {
     // add .glb to output path, unless it already ends in exactly that
+    outputFolder = FileUtils::getFolder(outputPath) + "/";
     if (suffix.has_value() && suffix.value() == "glb") {
       modelPath = outputPath;
     } else {

src/FBX2glTF.h

@@ -90,6 +90,8 @@ struct GltfOptions {
   /** If non-binary, whether to inline all resources, for a single (large) .glTF file. */
   bool embedResources{false};
 
+  bool separateTextures{true};
+
   /** Whether and how to use KHR_draco_mesh_compression to minimize static geometry size. */
   struct {
     bool enabled = false;

src/gltf/TextureBuilder.cpp

@@ -18,6 +18,10 @@
 #include <gltf/properties/ImageData.hpp>
 #include <gltf/properties/TextureData.hpp>
 
+#ifdef CopyFile
+#undef CopyFile
+#endif
+
 // keep track of some texture data as we load them
 struct TexInfo {
   explicit TexInfo(int rawTexIx) : rawTexIx(rawTexIx) {}
@@ -138,7 +142,7 @@ std::shared_ptr<TextureData> TextureBuilder::combine(
   }
 
   ImageData* image;
-  if (options.outputBinary) {
+  if (options.outputBinary && !options.separateTextures) {
     const auto bufferView =
         gltf.AddRawBufferView(*gltf.defaultBuffer, imgBuffer.data(), to_uint32(imgBuffer.size()));
     image = new ImageData(mergedName, *bufferView, png ? "image/png" : "image/jpeg");
@@ -200,18 +204,17 @@ std::shared_ptr<TextureData> TextureBuilder::simple(int rawTexIndex, const std::
 
   } else if (!relativeFilename.empty()) {
     image = new ImageData(relativeFilename, relativeFilename);
-    std::string outputPath = outputFolder + "/" + relativeFilename;
     auto srcAbs = FileUtils::GetAbsolutePath(rawTexture.fileLocation);
-    auto dstAbs = FileUtils::GetAbsolutePath(outputPath);
-    if (srcAbs != dstAbs)
-    if (FileUtils::CopyFile(rawTexture.fileLocation, outputPath, true)) {
-      if (verboseOutput) {
-        fmt::printf("Copied texture '%s' to output folder: %s\n", textureName, outputPath);
+    if (!FileUtils::FileExists(outputPath) && srcAbs != dstAbs) {
+      if (FileUtils::CopyFile(rawTexture.fileLocation, outputPath, true)) {
+        if (verboseOutput) {
+          fmt::printf("Copied texture '%s' to output folder: %s\n", textureName, outputPath);
+        }
+      } else {
+        // no point commenting further on read/write error; CopyFile() does enough of that, and we
+        // certainly want to to add an image struct to the glTF JSON, with the correct relative
+        // path reference, even if the copy failed.
       }
-    } else {
-      // no point commenting further on read/write error; CopyFile() does enough of that, and we
-      // certainly want to to add an image struct to the glTF JSON, with the correct relative path
-      // reference, even if the copy failed.
     }
   }
   if (!image) {

src/utils/File_Utils.cpp

@@ -19,6 +19,10 @@
 #include "FBX2glTF.h"
 #include "String_Utils.hpp"
 
+#ifdef CopyFile
+#undef CopyFile
+#endif
+
 namespace FileUtils {
 
 std::vector<std::string> ListFolderFiles(

src/utils/File_Utils.hpp

@@ -15,6 +15,10 @@
 #include <boost/filesystem.hpp>
 #include <boost/optional.hpp>
 
+#ifdef CopyFile
+#undef CopyFile
+#endif
+
 namespace FileUtils {
 
 std::string GetCurrentFolder();
@@ -34,7 +38,7 @@ bool CopyFile(
     bool createPath = false);
 
 inline std::string GetAbsolutePath(const std::string& filePath) {
-  return boost::filesystem::canonical(boost::filesystem::absolute(filePath)).string();
+  return boost::filesystem::absolute(filePath).string();
 }
 
 inline std::string GetCurrentFolder() {