ABI: Restore InputOptions::setTextureLayout(TextureType, int, int, int)

Although adding a method argument with default argument keeps API
compatibility, it changes the function type.

Use function overloading instead and implement the old one as a wrapper
to the extended one, supplying the default argument.

Fixes part of https://github.com/castano/nvidia-texture-tools/issues/259

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>

src/nvtt/InputOptions.cpp

@@ -124,7 +124,14 @@ void InputOptions::reset()
 
 
 // Setup the input image.
-void InputOptions::setTextureLayout(TextureType type, int width, int height, int depth /*= 1*/, int arraySize /*= 1*/)
+// Overload for ABI compatibility
+void InputOptions::setTextureLayout(TextureType type, int width, int height, int depth /*= 1*/)
+{
+    setTextureLayout(type, width, height, depth, 1);
+}
+
+// Setup the input image.
+void InputOptions::setTextureLayout(TextureType type, int width, int height, int depth, int arraySize)
 {
     // Validate arguments.
     nvCheck(width >= 0);

src/nvtt/nvtt.h

@@ -290,7 +290,9 @@ namespace nvtt
         NVTT_API void reset();
 
         // Setup input layout.
-        NVTT_API void setTextureLayout(TextureType type, int w, int h, int d = 1, int arraySize = 1);
+        // Overload for ABI compatibility
+        NVTT_API void setTextureLayout(TextureType type, int w, int h, int d = 1 /*, arraysize = 1 */);
+        NVTT_API void setTextureLayout(TextureType type, int w, int h, int d, int arraySize);
         NVTT_API void resetTextureLayout();
 
         // Set mipmap data. Copies the data.