t_context.h

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   GLubyte     *EdgeFlag;
   GLuint      *Elt;

   /* These attributes don't alias with the conventional attributes.
    * The GL_NV_vertex_program extension defines 16 extra sets of vertex
    * arrays which have precedent over the conventional arrays when enabled.
    */
   GLvector4f  Attribs[_TNL_ATTRIB_MAX];
};


/**
 * Contains the current state of a running pipeline.
 */
struct vertex_buffer
{
   /* Constant over life of the vertex_buffer.
    */
   GLuint      Size;

   /* Constant over the pipeline.
    */
   GLuint      Count;		              /* for everything except Elts */

   /* Pointers to current data.
    */
   GLuint      *Elts;		                
   GLvector4f  *ObjPtr;		                /* _TNL_BIT_POS */
   GLvector4f  *EyePtr;		                /* _TNL_BIT_POS */
   GLvector4f  *ClipPtr;	                /* _TNL_BIT_POS */
   GLvector4f  *NdcPtr;                         /* _TNL_BIT_POS */
   GLubyte     ClipOrMask;	                /* _TNL_BIT_POS */
   GLubyte     ClipAndMask;	                /* _TNL_BIT_POS */
   GLubyte     *ClipMask;		        /* _TNL_BIT_POS */
   GLvector4f  *NormalPtr;	                /* _TNL_BIT_NORMAL */
   GLfloat     *NormalLengthPtr;	        /* _TNL_BIT_NORMAL */
   GLboolean   *EdgeFlag;	                /* _TNL_BIT_EDGEFLAG */
   GLvector4f  *TexCoordPtr[MAX_TEXTURE_COORD_UNITS]; /* VERT_TEX_0..n */
   GLvector4f  *IndexPtr[2];	                /* _TNL_BIT_INDEX */
   GLvector4f  *ColorPtr[2];	                /* _TNL_BIT_COLOR0 */
   GLvector4f  *SecondaryColorPtr[2];           /* _TNL_BIT_COLOR1 */
   GLvector4f  *PointSizePtr;	                /* _TNL_BIT_POS */
   GLvector4f  *FogCoordPtr;	                /* _TNL_BIT_FOG */

   struct tnl_prim  *Primitive;	              
   GLuint      PrimitiveCount;	      

   /* Inputs to the vertex program stage */
   GLvector4f *AttribPtr[_TNL_ATTRIB_MAX];      /* GL_NV_vertex_program */
};


/** Describes an individual operation on the pipeline.
 */
struct tnl_pipeline_stage
{
   const char *name;

   /* Private data for the pipeline stage:
    */
   void *privatePtr;

   /* Allocate private data
    */
   GLboolean (*create)( GLcontext *ctx, struct tnl_pipeline_stage * );

   /* Free private data.
    */
   void (*destroy)( struct tnl_pipeline_stage * );

   /* Called on any statechange or input array size change or
    * input array change to/from zero stride.
    */
   void (*validate)( GLcontext *ctx, struct tnl_pipeline_stage * );

   /* Called from _tnl_run_pipeline().  The stage.changed_inputs value
    * encodes all inputs to thee struct which have changed.  If
    * non-zero, recompute all affected outputs of the stage, otherwise
    * execute any 'sideeffects' of the stage.
    *
    * Return value: GL_TRUE - keep going
    *               GL_FALSE - finished pipeline
    */
   GLboolean (*run)( GLcontext *ctx, struct tnl_pipeline_stage * );
};



/** Contains the array of all pipeline stages.
 * The default values are defined at the end of t_pipeline.c 
 */
struct tnl_pipeline {
   
   GLuint last_attrib_stride[_TNL_ATTRIB_MAX];
   GLuint last_attrib_size[_TNL_ATTRIB_MAX];
   GLuint input_changes;
   GLuint new_state;

   struct tnl_pipeline_stage stages[MAX_PIPELINE_STAGES+1];
   GLuint nr_stages;
};

struct tnl_clipspace;
struct tnl_clipspace_attr;

typedef void (*tnl_extract_func)( const struct tnl_clipspace_attr *a, 
				  GLfloat *out, 
				  const GLubyte *v );

typedef void (*tnl_insert_func)( const struct tnl_clipspace_attr *a, 
				 GLubyte *v, 
				 const GLfloat *in );

typedef void (*tnl_emit_func)( GLcontext *ctx, 
			       GLuint count, 
			       GLubyte *dest );


/**
 * Describes how to convert/move a vertex attribute from a vertex array
 * to a vertex structure.
 */
struct tnl_clipspace_attr
{
   GLuint attrib;          /* which vertex attrib (0=position, etc) */
   GLuint format;
   GLuint vertoffset;      /* position of the attrib in the vertex struct */
   GLuint vertattrsize;    /* size of the attribute in bytes */
   GLubyte *inputptr;
   GLuint inputstride;
   GLuint inputsize;
   const tnl_insert_func *insert;
   tnl_insert_func emit;
   tnl_extract_func extract;
   const GLfloat *vp;   /* NDC->Viewport mapping matrix */
};




typedef void (*tnl_points_func)( GLcontext *ctx, GLuint first, GLuint last );
typedef void (*tnl_line_func)( GLcontext *ctx, GLuint v1, GLuint v2 );
typedef void (*tnl_triangle_func)( GLcontext *ctx,
				   GLuint v1, GLuint v2, GLuint v3 );
typedef void (*tnl_quad_func)( GLcontext *ctx, GLuint v1, GLuint v2,
			       GLuint v3, GLuint v4 );
typedef void (*tnl_render_func)( GLcontext *ctx, GLuint start, GLuint count,
				 GLuint flags );
typedef void (*tnl_interp_func)( GLcontext *ctx,
				 GLfloat t, GLuint dst, GLuint out, GLuint in,
				 GLboolean force_boundary );
typedef void (*tnl_copy_pv_func)( GLcontext *ctx, GLuint dst, GLuint src );
typedef void (*tnl_setup_func)( GLcontext *ctx,
				GLuint start, GLuint end,
				GLuint new_inputs);


struct tnl_clipspace_fastpath {
   GLuint vertex_size;
   GLuint attr_count;
   GLboolean match_strides;

   struct attr_type {
      GLuint format;
      GLuint size;
      GLuint stride;
      GLuint offset;
   } *attr;

   tnl_emit_func func;
   struct tnl_clipspace_fastpath *next;
};

/**
 * Used to describe conversion of vertex arrays to vertex structures.
 * I.e. Structure of arrays to arrays of structs.
 */
struct tnl_clipspace
{
   GLboolean need_extras;
   
   GLuint new_inputs;

   GLubyte *vertex_buf;
   GLuint vertex_size;
   GLuint max_vertex_size;

   struct tnl_clipspace_attr attr[_TNL_ATTRIB_MAX];
   GLuint attr_count;

   tnl_emit_func emit;
   tnl_interp_func interp;
   tnl_copy_pv_func copy_pv;

   /* Parameters and constants for codegen:
    */
   GLboolean need_viewport;
   GLfloat vp_scale[4];		
   GLfloat vp_xlate[4];
   GLfloat chan_scale[4];
   GLfloat identity[4];

   struct tnl_clipspace_fastpath *fastpath;
   
   void (*codegen_emit)( GLcontext *ctx );
};


struct tnl_cache_item {
   GLuint hash;
   void *key;
   void *data;
   struct tnl_cache_item *next;
};

struct tnl_cache {
   struct tnl_cache_item **items;
   GLuint size, n_items;
};


struct tnl_device_driver
{
   /***
    *** TNL Pipeline
    ***/

   void (*RunPipeline)(GLcontext *ctx);
   /* Replaces PipelineStart/PipelineFinish -- intended to allow
    * drivers to wrap _tnl_run_pipeline() with code to validate state
    * and grab/release hardware locks.  
    */

   void (*NotifyMaterialChange)(GLcontext *ctx);
   /* Alert tnl-aware drivers of changes to material.
    */

   void (*NotifyInputChanges)(GLcontext *ctx, GLuint bitmask);
   /* Alert tnl-aware drivers of changes to size and stride of input
    * arrays.
    */

   GLboolean (*NotifyBegin)(GLcontext *ctx, GLenum p);
   /* Allow drivers to hook in optimized begin/end engines.
    * Return value:  GL_TRUE - driver handled the begin
    *                GL_FALSE - driver didn't handle the begin
    */

   /***
    *** Rendering -- These functions called only from t_vb_render.c
    ***/
   struct
   {
      void (*Start)(GLcontext *ctx);
      void (*Finish)(GLcontext *ctx);
      /* Called before and after all rendering operations, including DrawPixels,
       * ReadPixels, Bitmap, span functions, and CopyTexImage, etc commands.
       * These are a suitable place for grabbing/releasing hardware locks.
       */

      void (*PrimitiveNotify)(GLcontext *ctx, GLenum mode);
      /* Called between RenderStart() and RenderFinish() to indicate the
       * type of primitive we're about to draw.  Mode will be one of the
       * modes accepted by glBegin().
       */

      tnl_interp_func Interp;
      /* The interp function is called by the clipping routines when we need
       * to generate an interpolated vertex.  All pertinant vertex ancilliary
       * data should be computed by interpolating between the 'in' and 'out'
       * vertices.
       */

      tnl_copy_pv_func CopyPV;
      /* The copy function is used to make a copy of a vertex.  All pertinant
       * vertex attributes should be copied.
       */

      void (*ClippedPolygon)( GLcontext *ctx, const GLuint *elts, GLuint n );
      /* Render a polygon with <n> vertices whose indexes are in the <elts>
       * array.
       */

      void (*ClippedLine)( GLcontext *ctx, GLuint v0, GLuint v1 );
      /* Render a line between the two vertices given by indexes v0 and v1. */

      tnl_points_func           Points; /* must now respect vb->elts */
      tnl_line_func             Line;
      tnl_triangle_func         Triangle;
      tnl_quad_func             Quad;
      /* These functions are called in order to render points, lines,
       * triangles and quads.  These are only called via the T&L module.
       */

      tnl_render_func          *PrimTabVerts;
      tnl_render_func          *PrimTabElts;
      /* Render whole unclipped primitives (points, lines, linestrips,
       * lineloops, etc).  The tables are indexed by the GL enum of the
       * primitive to be rendered.  RenderTabVerts is used for non-indexed
       * arrays of vertices.  RenderTabElts is used for indexed arrays of
       * vertices.
       */

      void (*ResetLineStipple)( GLcontext *ctx );
      /* Reset the hardware's line stipple counter.
       */

      tnl_setup_func BuildVertices;
      /* This function is called whenever new vertices are required for
       * rendering.  The vertices in question are those n such that start
       * <= n < end.  The new_inputs parameter indicates those fields of
       * the vertex which need to be updated, if only a partial repair of
       * the vertex is required.
       *
       * This function is called only from _tnl_render_stage in tnl/t_render.c.
       */
      

      GLboolean (*Multipass)( GLcontext *ctx, GLuint passno );
      /* Driver may request additional render passes by returning GL_TRUE
       * when this function is called.  This function will be called
       * after the first pass, and passes will be made until the function
       * returns GL_FALSE.  If no function is registered, only one pass
       * is made.
       *
       * This function will be first invoked with passno == 1.
       */
   } Render;
};
   

/**
 * Context state for T&L context.
 */
typedef struct
{
   /* Driver interface.
    */
   struct tnl_device_driver Driver;

   /* Execute:
    */
   struct tnl_vtx vtx;
   
   /* Compile:
    */
   struct tnl_save save;

   /* Pipeline
    */
   struct tnl_pipeline pipeline;
   struct vertex_buffer vb;

   /* GLvectors for binding to vb:
    */
   struct tnl_vertex_arrays vtx_inputs;
   struct tnl_vertex_arrays save_inputs;
   struct tnl_vertex_arrays current;
   struct tnl_vertex_arrays array_inputs;

   /* Clipspace/ndc/window vertex managment:
    */
   struct tnl_clipspace clipspace;

   /* Probably need a better configuration mechanism:
    */
   GLboolean NeedNdcCoords;
   GLboolean LoopbackDListCassettes;
   GLboolean CalcDListNormalLengths;
   GLboolean IsolateMaterials;
   GLboolean AllowVertexFog;
   GLboolean AllowPixelFog;
   GLboolean AllowCodegen;

   GLboolean _DoVertexFog;  /* eval fog function at each vertex? */

   /* If True, it means we started a glBegin/End primtive with an invalid
    * vertex/fragment program or incomplete framebuffer.  In that case,
    * discard any buffered vertex data.
    */
   GLboolean DiscardPrimitive;

   GLuint render_inputs;

   GLvertexformat exec_vtxfmt;
   GLvertexformat save_vtxfmt;

   struct tnl_cache *vp_cache;

} TNLcontext;



#define TNL_CONTEXT(ctx) ((TNLcontext *)((ctx)->swtnl_context))


#define TYPE_IDX(t) ((t) & 0xf)
#define MAX_TYPES TYPE_IDX(GL_DOUBLE)+1      /* 0xa + 1 */


#endif