src/gallium/auxiliary/util/u_draw.h

   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
  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
  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
  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
  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
 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 */