Add experimental image based interface.

src/nvtt/experimental/nvtt_experimental.cpp

@@ -0,0 +1,60 @@
+
+#include "nvtt_experimental.h"
+
+struct NvttImage
+{
+	NvttImage() :
+		m_constant(false),
+		m_image(NULL),
+		m_floatImage(NULL)
+	{
+	}
+	
+	~NvttImage()
+	{
+		if (m_constant && m_image) m_image->unwrap();
+		delete m_image;
+		delete m_floatImage;
+	}
+	
+	bool m_constant;
+	Image * m_image;
+	FloatImage * m_floatImage;
+};
+
+NvttImage * nvttCreateImage() 
+{
+	return new NvttImage();
+}
+	
+void nvttDestroyImage(NvttImage * img)
+{
+	delete img;
+}
+
+void nvttSetImageData(NvttImage * img, NvttInputFormat format, uint w, uint h, void * data)
+{
+	nvCheck(img != NULL);
+	
+	if (format == NVTT_InputFormat_BGRA_8UB)
+	{
+		img->m_constant = false;
+		img->m_image->allocate(w, h);
+		memcpy(img->m_image->pixels(), data, w * h * 4);
+	}
+	else
+	{
+		nvCheck(false);
+	}
+}
+
+void nvttCompressImage(NvttImage * img, NvttFormat format)
+{
+	nvCheck(img != NULL);
+
+	// @@ Invoke appropriate compressor.
+}
+
+
+
+#endif // NVTT_EXPERIMENTAL_H