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-INTRODUCTION
-
-A helper module which provides glue to bind the software rasterizer to
-the software t&l module.  The main task of this module is to build
-swrast vertices from the t&l vertex_buffer structs, and to use them to
-perform triangle setup functions not implemented in the software
-rasterizer.
-
-The module implements a full set of functions to plug into the
-t_vb_render.c driver interface (tnl->Driver.Render.*).  
-
-There are strong advantages to decoupling the software rasterizer from
-the t&l module, primarily allowing hardware drivers better control
-over fallbacks, the removal of implicit knowledge about the software
-rasterizer in the t&l module, allowing the two modules to evolve
-independently and allowing either to be substituted with equivalent
-functionality from another codebase.
-
-This module implements triangle/quad setup for offset, unfilled and
-twoside-lit triangles.  The software rasterizer doesn't handle these
-primitives directly.
-
-Hardware rasterization drivers typically use this module in situations
-where no hardware rasterization is possible, ie during total
-fallbacks. 
-
-STATE
-
-To create and destroy the module:
-
-	GLboolean _swsetup_CreateContext( GLcontext *ctx );
-	void _swsetup_DestroyContext( GLcontext *ctx );
-
-The module is not active by default, and must be installed by calling
-_swrast_Wakeup().  This function installs internal swrast_setup
-functions into all the tnl->Driver.Render driver hooks, thus taking
-over the task of rasterization entirely:
-
-        void _swrast_Wakeup( GLcontext *ctx );
-
-   
-This module tracks state changes internally and maintains derived
-values based on the current state.  For this to work, the driver
-ensure the following funciton is called whenever the state changes and
-the swsetup module is 'awake':
-
-	void _swsetup_InvalidateState( GLcontext *ctx, GLuint new_state );
-
-There is no explicit call to put the swsetup module to sleep.  Simply
-install other function pointers into all the tnl->Driver.Render.*
-hooks, and (optionally) cease calling _swsetup_InvalidateState().
-
-DRIVER INTERFACE
-
-The module offers a minimal driver interface:
-
-	 void (*Start)( GLcontext *ctx );
-	 void (*Finish)( GLcontext *ctx );
-	 
-These are called before and after the completion of all swrast drawing
-activity.  As swrast doesn't call callbacks during triangle, line or
-point rasterization, these are necessary to provide locking hooks for
-some drivers.  They may otherwise be left null.
-
-