draw_vertex.h revision 079be0fd3f1d0f52f26a95756809ac4a2325ccb1 
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 * Post-transform vertex format info.  The vertex_info struct is used by
30 * the draw_vbuf code to emit hardware-specific vertex layouts into hw
31 * vertex buffers.
32 *
33 * Author:
34 *    Brian Paul
35 */
36
37
38#ifndef DRAW_VERTEX_H
39#define DRAW_VERTEX_H
40
41
42#include "pipe/p_state.h"
43
44
45/**
46 * Vertex attribute emit modes
47 */
48enum attrib_emit {
49   EMIT_OMIT,      /**< don't emit the attribute */
50   EMIT_1F,
51   EMIT_1F_PSIZE,  /**< insert constant point size */
52   EMIT_2F,
53   EMIT_3F,
54   EMIT_4F,
55   EMIT_4UB  /**< XXX may need variations for RGBA vs BGRA, etc */
56};
57
58
59/**
60 * Attribute interpolation mode
61 */
62enum interp_mode {
63   INTERP_NONE,      /**< never interpolate vertex header info */
64   INTERP_POS,       /**< special case for frag position */
65   INTERP_CONSTANT,
66   INTERP_LINEAR,
67   INTERP_PERSPECTIVE
68};
69
70
71/**
72 * Information about hardware/rasterization vertex layout.
73 */
74struct vertex_info
75{
76   uint num_attribs;
77   uint hwfmt[4];      /**< hardware format info for this format */
78   uint size;          /**< total vertex size in dwords */
79
80   /* Keep this small and at the end of the struct to allow quick
81    * memcmp() comparisons.
82    */
83   struct {
84      unsigned interp_mode:4;      /**< INTERP_x */
85      unsigned emit:4;             /**< EMIT_x */
86      unsigned src_index:8;          /**< map to post-xform attribs */
87   } attrib[PIPE_MAX_SHADER_INPUTS];
88};
89
90static INLINE size_t
91draw_vinfo_size( const struct vertex_info *a )
92{
93   return offsetof(const struct vertex_info, attrib[a->num_attribs]);
94}
95
96static INLINE int
97draw_vinfo_compare( const struct vertex_info *a,
98                    const struct vertex_info *b )
99{
100   size_t sizea = draw_vinfo_size( a );
101   return memcmp( a, b, sizea );
102}
103
104static INLINE void
105draw_vinfo_copy( struct vertex_info *dst,
106                 const struct vertex_info *src )
107{
108   size_t size = draw_vinfo_size( src );
109   memcpy( dst, src, size );
110}
111
112
113
114/**
115 * Add another attribute to the given vertex_info object.
116 * \param src_index  indicates which post-transformed vertex attrib slot
117 *                   corresponds to this attribute.
118 * \return slot in which the attribute was added
119 */
120static INLINE uint
121draw_emit_vertex_attr(struct vertex_info *vinfo,
122                      enum attrib_emit emit,
123                      enum interp_mode interp, /* only used by softpipe??? */
124                      uint src_index)
125{
126   const uint n = vinfo->num_attribs;
127   assert(n < PIPE_MAX_SHADER_INPUTS);
128   vinfo->attrib[n].emit = emit;
129   vinfo->attrib[n].interp_mode = interp;
130   vinfo->attrib[n].src_index = src_index;
131   vinfo->num_attribs++;
132   return n;
133}
134
135
136extern void draw_compute_vertex_size(struct vertex_info *vinfo);
137
138void draw_dump_emitted_vertex(const struct vertex_info *vinfo,
139                              const uint8_t *data);
140
141
142static INLINE unsigned draw_translate_vinfo_format(unsigned format )
143{
144   switch (format) {
145   case EMIT_1F:
146   case EMIT_1F_PSIZE:
147      return PIPE_FORMAT_R32_FLOAT;
148   case EMIT_2F:
149      return PIPE_FORMAT_R32G32_FLOAT;
150   case EMIT_3F:
151      return PIPE_FORMAT_R32G32B32_FLOAT;
152   case EMIT_4F:
153      return PIPE_FORMAT_R32G32B32A32_FLOAT;
154   case EMIT_4UB:
155      return PIPE_FORMAT_R8G8B8A8_UNORM;
156   default:
157      return PIPE_FORMAT_NONE;
158   }
159}
160
161
162#endif /* DRAW_VERTEX_H */
163