1/**************************************************************************
2 *
3 * Copyright 2007 VMware, Inc.
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 VMWARE 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 <keithw@vmware.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#include "draw_context.h"
39
40
41/**
42 * Basic info for a point/line/triangle primitive.
43 */
44struct prim_header {
45   float det;                 /**< front/back face determinant */
46   ushort flags;
47   ushort pad;
48   struct vertex_header *v[3];  /**< 1 to 3 vertex pointers */
49};
50
51
52
53/**
54 * Base class for all primitive drawing stages.
55 */
56struct draw_stage
57{
58   struct draw_context *draw;   /**< parent context */
59
60   struct draw_stage *next;     /**< next stage in pipeline */
61   const char *name;            /**< for debugging  */
62
63   struct vertex_header **tmp;  /**< temp vert storage, such as for clipping */
64   unsigned nr_tmps;
65
66   void (*point)( struct draw_stage *,
67		  struct prim_header * );
68
69   void (*line)( struct draw_stage *,
70		 struct prim_header * );
71
72   void (*tri)( struct draw_stage *,
73		struct prim_header * );
74
75   void (*flush)( struct draw_stage *,
76		  unsigned flags );
77
78   void (*reset_stipple_counter)( struct draw_stage * );
79
80   void (*destroy)( struct draw_stage * );
81};
82
83
84extern struct draw_stage *draw_unfilled_stage( struct draw_context *context );
85extern struct draw_stage *draw_twoside_stage( struct draw_context *context );
86extern struct draw_stage *draw_offset_stage( struct draw_context *context );
87extern struct draw_stage *draw_clip_stage( struct draw_context *context );
88extern struct draw_stage *draw_flatshade_stage( struct draw_context *context );
89extern struct draw_stage *draw_cull_stage( struct draw_context *context );
90extern struct draw_stage *draw_stipple_stage( struct draw_context *context );
91extern struct draw_stage *draw_wide_line_stage( struct draw_context *context );
92extern struct draw_stage *draw_wide_point_stage( struct draw_context *context );
93extern struct draw_stage *draw_validate_stage( struct draw_context *context );
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
104void draw_aapoint_prepare_outputs(struct draw_context *context,
105                                  struct draw_stage *stage);
106void draw_aaline_prepare_outputs(struct draw_context *context,
107                                 struct draw_stage *stage);
108void draw_unfilled_prepare_outputs(struct draw_context *context,
109                                   struct draw_stage *stage);
110
111/**
112 * Get a writeable copy of a vertex.
113 * \param stage  drawing stage info
114 * \param vert  the vertex to copy (source)
115 * \param idx  index into stage's tmp[] array to put the copy (dest)
116 * \return  pointer to the copied vertex
117 */
118static inline struct vertex_header *
119dup_vert( struct draw_stage *stage,
120	  const struct vertex_header *vert,
121	  unsigned idx )
122{
123   struct vertex_header *tmp = stage->tmp[idx];
124   const uint vsize = sizeof(struct vertex_header)
125      + draw_num_shader_outputs(stage->draw) * 4 * sizeof(float);
126   memcpy(tmp, vert, vsize);
127   tmp->vertex_id = UNDEFINED_VERTEX_ID;
128   return tmp;
129}
130
131#endif
132