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@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 */
43struct 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 */
55struct 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
83extern struct draw_stage *draw_unfilled_stage( struct draw_context *context );
84extern struct draw_stage *draw_twoside_stage( struct draw_context *context );
85extern struct draw_stage *draw_offset_stage( struct draw_context *context );
86extern struct draw_stage *draw_clip_stage( struct draw_context *context );
87extern struct draw_stage *draw_flatshade_stage( struct draw_context *context );
88extern struct draw_stage *draw_cull_stage( struct draw_context *context );
89extern struct draw_stage *draw_stipple_stage( struct draw_context *context );
90extern struct draw_stage *draw_wide_line_stage( struct draw_context *context );
91extern struct draw_stage *draw_wide_point_stage( struct draw_context *context );
92extern struct draw_stage *draw_validate_stage( struct draw_context *context );
93
94
95extern void draw_free_temp_verts( struct draw_stage *stage );
96extern boolean draw_alloc_temp_verts( struct draw_stage *stage, unsigned nr );
97
98extern void draw_reset_vertex_ids( struct draw_context *draw );
99
100void draw_pipe_passthrough_tri(struct draw_stage *stage, struct prim_header *header);
101void draw_pipe_passthrough_line(struct draw_stage *stage, struct prim_header *header);
102void 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 */
113static INLINE struct vertex_header *
114dup_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