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      1 /**************************************************************************
      2  *
      3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
      4  * All Rights Reserved.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the
      8  * "Software"), to deal in the Software without restriction, including
      9  * without limitation the rights to use, copy, modify, merge, publish,
     10  * distribute, sub license, and/or sell copies of the Software, and to
     11  * permit persons to whom the Software is furnished to do so, subject to
     12  * the following conditions:
     13  *
     14  * The above copyright notice and this permission notice (including the
     15  * next paragraph) shall be included in all copies or substantial portions
     16  * of the Software.
     17  *
     18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
     19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
     21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
     22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
     23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
     24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     25  *
     26  **************************************************************************/
     27 
     28  /*
     29   * Authors:
     30   *   Keith Whitwell <keith (at) tungstengraphics.com>
     31   */
     32 
     33 #ifndef DRAW_PIPE_H
     34 #define DRAW_PIPE_H
     35 
     36 #include "pipe/p_compiler.h"
     37 #include "draw_private.h"       /* for sizeof(vertex_header) */
     38 
     39 
     40 /**
     41  * Basic info for a point/line/triangle primitive.
     42  */
     43 struct prim_header {
     44    float det;                 /**< front/back face determinant */
     45    ushort flags;
     46    ushort pad;
     47    struct vertex_header *v[3];  /**< 1 to 3 vertex pointers */
     48 };
     49 
     50 
     51 
     52 /**
     53  * Base class for all primitive drawing stages.
     54  */
     55 struct draw_stage
     56 {
     57    struct draw_context *draw;   /**< parent context */
     58 
     59    struct draw_stage *next;     /**< next stage in pipeline */
     60    const char *name;            /**< for debugging  */
     61 
     62    struct vertex_header **tmp;  /**< temp vert storage, such as for clipping */
     63    unsigned nr_tmps;
     64 
     65    void (*point)( struct draw_stage *,
     66 		  struct prim_header * );
     67 
     68    void (*line)( struct draw_stage *,
     69 		 struct prim_header * );
     70 
     71    void (*tri)( struct draw_stage *,
     72 		struct prim_header * );
     73 
     74    void (*flush)( struct draw_stage *,
     75 		  unsigned flags );
     76 
     77    void (*reset_stipple_counter)( struct draw_stage * );
     78 
     79    void (*destroy)( struct draw_stage * );
     80 };
     81 
     82 
     83 extern struct draw_stage *draw_unfilled_stage( struct draw_context *context );
     84 extern struct draw_stage *draw_twoside_stage( struct draw_context *context );
     85 extern struct draw_stage *draw_offset_stage( struct draw_context *context );
     86 extern struct draw_stage *draw_clip_stage( struct draw_context *context );
     87 extern struct draw_stage *draw_flatshade_stage( struct draw_context *context );
     88 extern struct draw_stage *draw_cull_stage( struct draw_context *context );
     89 extern struct draw_stage *draw_stipple_stage( struct draw_context *context );
     90 extern struct draw_stage *draw_wide_line_stage( struct draw_context *context );
     91 extern struct draw_stage *draw_wide_point_stage( struct draw_context *context );
     92 extern struct draw_stage *draw_validate_stage( struct draw_context *context );
     93 
     94 
     95 extern void draw_free_temp_verts( struct draw_stage *stage );
     96 extern boolean draw_alloc_temp_verts( struct draw_stage *stage, unsigned nr );
     97 
     98 extern void draw_reset_vertex_ids( struct draw_context *draw );
     99 
    100 void draw_pipe_passthrough_tri(struct draw_stage *stage, struct prim_header *header);
    101 void draw_pipe_passthrough_line(struct draw_stage *stage, struct prim_header *header);
    102 void draw_pipe_passthrough_point(struct draw_stage *stage, struct prim_header *header);
    103 
    104 
    105 
    106 /**
    107  * Get a writeable copy of a vertex.
    108  * \param stage  drawing stage info
    109  * \param vert  the vertex to copy (source)
    110  * \param idx  index into stage's tmp[] array to put the copy (dest)
    111  * \return  pointer to the copied vertex
    112  */
    113 static INLINE struct vertex_header *
    114 dup_vert( struct draw_stage *stage,
    115 	  const struct vertex_header *vert,
    116 	  unsigned idx )
    117 {
    118    struct vertex_header *tmp = stage->tmp[idx];
    119    const uint vsize = sizeof(struct vertex_header)
    120       + stage->draw->vs.num_vs_outputs * 4 * sizeof(float);
    121    memcpy(tmp, vert, vsize);
    122    tmp->vertex_id = UNDEFINED_VERTEX_ID;
    123    return tmp;
    124 }
    125 
    126 #endif
    127