Vertex texture sampling support in Direct3D 9 now controlled via texture-flag ETCF_SUPPORT_VERTEXT_TEXTURE

It's no longer enabled by default as it causes some costs to all texture switches.
Thanks @ edo9300 for reporting (http://irrlicht.sourceforge.net/forum/viewtopic.php?f=7&t=52721)

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6219 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CD3D9Texture.h

@@ -42,6 +42,11 @@ public:
 	IDirect3DTexture9* getDX9Texture() const;
 	IDirect3DCubeTexture9* getDX9CubeTexture() const;
 
+	inline bool HasVertexTextureSupport() const 
+	{
+		return VertexTextureSupport;
+	}
+
 private:
 	friend class CD3D9Driver;
 
@@ -77,6 +82,7 @@ private:
 	u32 MipLevelLocked;
 
 	bool HardwareMipMaps;
+	bool VertexTextureSupport;
 
 	IDirect3DDevice9* Device;
 	IDirect3DTexture9* Texture;