draw_vertex.h revision 7b85ea19de09d4e7e077ca147528e90e52683690 
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   enum interp_mode interp_mode[PIPE_MAX_SHADER_INPUTS];
79   enum attrib_emit emit[PIPE_MAX_SHADER_INPUTS];   /**< EMIT_x */
80   uint src_index[PIPE_MAX_SHADER_INPUTS]; /**< map to post-xform attribs */
81   uint size;          /**< total vertex size in dwords */
82};
83
84
85
86/**
87 * Add another attribute to the given vertex_info object.
88 * \param src_index  indicates which post-transformed vertex attrib slot
89 *                   corresponds to this attribute.
90 * \return slot in which the attribute was added
91 */
92static INLINE uint
93draw_emit_vertex_attr(struct vertex_info *vinfo,
94                      enum attrib_emit emit, enum interp_mode interp,
95                      uint src_index)
96{
97   const uint n = vinfo->num_attribs;
98   assert(n < PIPE_MAX_SHADER_INPUTS);
99   vinfo->emit[n] = emit;
100   vinfo->interp_mode[n] = interp;
101   vinfo->src_index[n] = src_index;
102   vinfo->num_attribs++;
103   return n;
104}
105
106
107extern void draw_compute_vertex_size(struct vertex_info *vinfo);
108
109void draw_dump_emitted_vertex(const struct vertex_info *vinfo,
110                              const uint8_t *data);
111
112
113static INLINE unsigned draw_translate_vinfo_format(unsigned format )
114{
115   switch (format) {
116   case EMIT_1F:
117   case EMIT_1F_PSIZE:
118      return PIPE_FORMAT_R32_FLOAT;
119   case EMIT_2F:
120      return PIPE_FORMAT_R32G32_FLOAT;
121   case EMIT_3F:
122      return PIPE_FORMAT_R32G32B32_FLOAT;
123   case EMIT_4F:
124      return PIPE_FORMAT_R32G32B32A32_FLOAT;
125   case EMIT_4UB:
126      return PIPE_FORMAT_R8G8B8A8_UNORM;
127   default:
128      return PIPE_FORMAT_NONE;
129   }
130}
131
132
133#endif /* DRAW_VERTEX_H */
134