1 /**************************************************************************
2  *
3  * Copyright 2011 Marek Olšák <maraeo@gmail.com>
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 AUTHORS 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 #ifndef U_VBUF_H
29 #define U_VBUF_H
30 
31 /* This module takes care of user buffer uploads and vertex format fallbacks.
32  * It's designed for the drivers which don't want to use the Draw module.
33  * There is a more detailed description at the beginning of the .c file.
34  */
35 
36 #include "pipe/p_context.h"
37 #include "pipe/p_state.h"
38 #include "pipe/p_format.h"
39 
40 struct cso_context;
41 struct cso_velems_state;
42 struct u_vbuf;
43 
44 /* Hardware vertex fetcher limitations can be described by this structure. */
45 struct u_vbuf_caps {
46    enum pipe_format format_translation[PIPE_FORMAT_COUNT];
47 
48    /* Whether vertex fetches don't have to be 4-byte-aligned. */
49    /* TRUE if hardware supports it. */
50    unsigned buffer_offset_unaligned:1;
51    unsigned buffer_stride_unaligned:1;
52    unsigned velem_src_offset_unaligned:1;
53 
54    /* Whether the driver supports user vertex buffers. */
55    unsigned user_vertex_buffers:1;
56 
57    /* Maximum number of vertex buffers */
58    unsigned max_vertex_buffers:6;
59 
60    bool fallback_always;
61    bool fallback_only_for_user_vbuffers;
62 };
63 
64 
65 void u_vbuf_get_caps(struct pipe_screen *screen, struct u_vbuf_caps *caps,
66                      bool needs64b);
67 
68 struct u_vbuf *
69 u_vbuf_create(struct pipe_context *pipe, struct u_vbuf_caps *caps);
70 
71 void u_vbuf_destroy(struct u_vbuf *mgr);
72 
73 /* State and draw functions. */
74 void u_vbuf_set_vertex_elements(struct u_vbuf *mgr,
75                                 const struct cso_velems_state *velems);
76 void u_vbuf_unset_vertex_elements(struct u_vbuf *mgr);
77 void u_vbuf_set_vertex_buffers(struct u_vbuf *mgr,
78                                unsigned start_slot, unsigned count,
79                                const struct pipe_vertex_buffer *bufs);
80 void u_vbuf_draw_vbo(struct u_vbuf *mgr, const struct pipe_draw_info *info);
81 void u_vbuf_get_minmax_index(struct pipe_context *pipe,
82                              const struct pipe_draw_info *info,
83                              unsigned *out_min_index, unsigned *out_max_index);
84 
85 /* Save/restore functionality. */
86 void u_vbuf_save_vertex_elements(struct u_vbuf *mgr);
87 void u_vbuf_restore_vertex_elements(struct u_vbuf *mgr);
88 void u_vbuf_save_vertex_buffer0(struct u_vbuf *mgr);
89 void u_vbuf_restore_vertex_buffer0(struct u_vbuf *mgr);
90 
91 #endif
92