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-INTRODUCTION
-
-A generic, configurable software implementation of GL transformation &
-lighting.
-
-This module provides an implementation of the routines required by the
-'vtxfmt' mechanism of core mesa for tnl functionality in all
-combinations of compile and execute modes.
-
-Most current drivers use the tnl module exclusively to provide this
-functionality, though there is an experimental alternate
-implementation provided by the tnl_dd/t_dd_imm_* files which can
-handle a small subset of GL states in execute mode only.
-
-
-STATE
-
-To create and destroy the module:
-
-	GLboolean _tnl_CreateContext( GLcontext *ctx );
-	void _tnl_DestroyContext( GLcontext *ctx );
-
-The module is not active by default, and must be installed by calling
-_tnl_Wakeup().  This function installs internal tnl functions into all
-the vtxfmt dispatch hooks, thus taking over the task of transformation
-and lighting entirely:
-
-        void _tnl_wakeup_exec( GLcontext *ctx );
-	void _tnl_wakeup_save_exec( 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 _tnl_InvalidateState( GLcontext *ctx, GLuint new_state );
-
-There is no explicit call to put the tnl module to sleep.  Simply
-install other function pointers into all the vtxfmt dispatch slots,
-and (optionally) cease calling _tnl_InvalidateState().
-
-CUSTOMIZATION
-
-The module provides customizability through several mechanisms.  The
-most important is by allowing drivers to specify the pipeline through
-which vertex data is passed, including its eventual transfer to
-rasterization hardware (or software).
-
-The default pipeline is specified in t_pipeline.c, and is usually a
-starting point for driver pipelines.  Some drivers will remove a stage
-where hardware provides support for the implemented operation (for
-instance fog where per-pixel hardware fog is available, as in the dri
-tdfx driver), or add stages to shortcircuit latter operations (for
-example taking advantage of hardware support for strips and other
-higher-level primitives (for example the radeon driver).
-
-In addition, the following functions provide further tweaks:
-
-extern void
-_tnl_need_projected_coords( GLcontext *ctx, GLboolean flag );
-
-	- Direct the default vertex transformation stage to
-          produce/not produce projected clip coordinates.
-	  
-extern void
-_tnl_need_dlist_loopback( GLcontext *ctx, GLboolean flag );
-      
-        - Direct the display list component of the tnl module to
-          replay display lists as 'glVertex' type calls, rather than
-          passing the display list data directly into the tnl pipeline
-          mechanism.  
-
-	  This allows display lists to be replayed by the tnl module
-	  even when the module is not strictly active.
-
-
-extern void
-_tnl_need_dlist_norm_lengths( GLcontext *ctx, GLboolean flag );
-
-	- Direct the display list component to enable/disable caching
-          1/length values for display list normals.  Doing so is
-          ususally helpful when lighting is performed in software, but
-          wasteful otherwise.
-
-
-DRIVER INTERFACE
-
-The module itself offers a minimal driver interface:
-
-	 void (*RunPipeline)( GLcontext *ctx );
-
-Normally this is set to _tnl_RunPipeline(), however the driver can use
-this hook to wrap checks or other code around this call. 
-
-In addition, the driver interface for the default render pipeline
-stage is housed in the tnl context struct (this could be cleaner).  
-
-
-RENDER DRIVER INTERFACE
-
-See t_context.h for the definition and explanation of this.
-\ No newline at end of file