always use 0 for the default texture

stepmania/src/RageDisplay.h

@@ -196,9 +196,6 @@ public:
 		RageSurface* img, 		// must be in pixfmt
 		bool bGenerateMipMaps
 		) = 0;
-	/* Return a texture handle to the default texture, an opaque, all-white,
-	 * immutable texture.  Deleting or updating this texture has no effect. */
-	virtual unsigned CreateTextureDefault() = 0;
 	virtual void UpdateTexture( 
 		unsigned iTexHandle, 
 		RageSurface* img,

stepmania/src/RageDisplay_D3D.h

@@ -27,7 +27,6 @@ public:
 		PixelFormat pixfmt, 
 		RageSurface* img, 
 		bool bGenerateMipMaps );
-	unsigned CreateTextureDefault() { return 0; }
 	void UpdateTexture( 
 		unsigned iTexHandle, 
 		RageSurface* img,

stepmania/src/RageDisplay_Null.h

@@ -24,7 +24,6 @@ public:
 		PixelFormat pixfmt, 
 		RageSurface* img,
 		bool bGenerateMipMaps ) { return 1; }
-	unsigned CreateTextureDefault() { return 0; }
 	void UpdateTexture( 
 		unsigned iTexHandle, 
 		RageSurface* img,

stepmania/src/RageDisplay_OGL.h

@@ -34,7 +34,6 @@ public:
 		PixelFormat pixfmt, 
 		RageSurface* img,
 		bool bGenerateMipMaps );
-	unsigned CreateTextureDefault() { return 0; }
 	void UpdateTexture( 
 		unsigned iTexHandle, 
 		RageSurface* img,

stepmania/src/RageTextureManager.cpp

@@ -108,7 +108,7 @@ public:
 	RageTexture_Default():
 		RageTexture( RageTextureID() )
 	{
-		m_uTexHandle = DISPLAY->CreateTextureDefault();
+		m_uTexHandle = 0;
 		m_iSourceWidth = m_iSourceHeight = 1;
 		m_iTextureWidth = m_iTextureHeight = 1;
 		m_iImageWidth = m_iImageHeight = 1;