-extern void fxDDStencilFunc (GLcontext *ctx, GLenum func, GLint ref, GLuint mask);
-extern void fxDDStencilMask (GLcontext *ctx, GLuint mask);
-extern void fxDDStencilOp (GLcontext *ctx, GLenum sfail, GLenum zfail, GLenum zpass);
+extern void fxDDStencilFuncSeparate (GLcontext *ctx, GLenum face, GLenum func, GLint ref, GLuint mask);
+extern void fxDDStencilMaskSeparate (GLcontext *ctx, GLenum face, GLuint mask);
+extern void fxDDStencilOpSeparate (GLcontext *ctx, GLenum face, GLenum sfail, GLenum zfail, GLenum zpass);