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1 /**************************************************************************
2  *
3  * Copyright 2008 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 #ifndef U_DRAW_H
29 #define U_DRAW_H
30 
31 
32 #include "pipe/p_compiler.h"
33 #include "pipe/p_context.h"
34 #include "pipe/p_state.h"
35 
36 
37 #ifdef __cplusplus
38 extern "C" {
39 #endif
40 
41 
42 static inline void
util_draw_init_info(struct pipe_draw_info * info)43 util_draw_init_info(struct pipe_draw_info *info)
44 {
45    memset(info, 0, sizeof(*info));
46    info->instance_count = 1;
47    info->max_index = 0xffffffff;
48 }
49 
50 
51 static inline void
util_draw_arrays(struct pipe_context * pipe,enum pipe_prim_type mode,uint start,uint count)52 util_draw_arrays(struct pipe_context *pipe,
53                  enum pipe_prim_type mode,
54                  uint start,
55                  uint count)
56 {
57    struct pipe_draw_info info;
58 
59    util_draw_init_info(&info);
60    info.mode = mode;
61    info.start = start;
62    info.count = count;
63    info.min_index = start;
64    info.max_index = start + count - 1;
65 
66    pipe->draw_vbo(pipe, &info);
67 }
68 
69 static inline void
util_draw_elements(struct pipe_context * pipe,void * indices,unsigned index_size,int index_bias,enum pipe_prim_type mode,uint start,uint count)70 util_draw_elements(struct pipe_context *pipe,
71                    void *indices,
72                    unsigned index_size,
73                    int index_bias, enum pipe_prim_type mode,
74                    uint start,
75                    uint count)
76 {
77    struct pipe_draw_info info;
78 
79    util_draw_init_info(&info);
80    info.index.user = indices;
81    info.has_user_indices = true;
82    info.index_size = index_size;
83    info.mode = mode;
84    info.start = start;
85    info.count = count;
86    info.index_bias = index_bias;
87 
88    pipe->draw_vbo(pipe, &info);
89 }
90 
91 static inline void
util_draw_arrays_instanced(struct pipe_context * pipe,enum pipe_prim_type mode,uint start,uint count,uint start_instance,uint instance_count)92 util_draw_arrays_instanced(struct pipe_context *pipe,
93                            enum pipe_prim_type mode,
94                            uint start,
95                            uint count,
96                            uint start_instance,
97                            uint instance_count)
98 {
99    struct pipe_draw_info info;
100 
101    util_draw_init_info(&info);
102    info.mode = mode;
103    info.start = start;
104    info.count = count;
105    info.start_instance = start_instance;
106    info.instance_count = instance_count;
107    info.min_index = start;
108    info.max_index = start + count - 1;
109 
110    pipe->draw_vbo(pipe, &info);
111 }
112 
113 static inline void
util_draw_elements_instanced(struct pipe_context * pipe,void * indices,unsigned index_size,int index_bias,enum pipe_prim_type mode,uint start,uint count,uint start_instance,uint instance_count)114 util_draw_elements_instanced(struct pipe_context *pipe,
115                              void *indices,
116                              unsigned index_size,
117                              int index_bias,
118                              enum pipe_prim_type mode,
119                              uint start,
120                              uint count,
121                              uint start_instance,
122                              uint instance_count)
123 {
124    struct pipe_draw_info info;
125 
126    util_draw_init_info(&info);
127    info.index.user = indices;
128    info.has_user_indices = true;
129    info.index_size = index_size;
130    info.mode = mode;
131    info.start = start;
132    info.count = count;
133    info.index_bias = index_bias;
134    info.start_instance = start_instance;
135    info.instance_count = instance_count;
136 
137    pipe->draw_vbo(pipe, &info);
138 }
139 
140 
141 /* This converts an indirect draw into a direct draw by mapping the indirect
142  * buffer, extracting its arguments, and calling pipe->draw_vbo.
143  */
144 void
145 util_draw_indirect(struct pipe_context *pipe,
146                    const struct pipe_draw_info *info);
147 
148 
149 unsigned
150 util_draw_max_index(
151       const struct pipe_vertex_buffer *vertex_buffers,
152       const struct pipe_vertex_element *vertex_elements,
153       unsigned nr_vertex_elements,
154       const struct pipe_draw_info *info);
155 
156 
157 #ifdef __cplusplus
158 }
159 #endif
160 
161 #endif /* !U_DRAW_H */
162