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
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  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, unsigned index_size,
  71                    int index_bias, enum pipe_prim_type mode,
  72                    uint start,
  73                    uint count)
  74 {
  75    struct pipe_draw_info info;
  76
  77    util_draw_init_info(&info);
  78    info.index_size = index_size;
  79    info.mode = mode;
  80    info.start = start;
  81    info.count = count;
  82    info.index_bias = index_bias;
  83
  84    pipe->draw_vbo(pipe, &info);
  85 }
  86
  87 static inline void
  88 util_draw_arrays_instanced(struct pipe_context *pipe,
  89                            enum pipe_prim_type mode,
  90                            uint start,
  91                            uint count,
  92                            uint start_instance,
  93                            uint instance_count)
  94 {
  95    struct pipe_draw_info info;
  96
  97    util_draw_init_info(&info);
  98    info.mode = mode;
  99    info.start = start;
 100    info.count = count;
 101    info.start_instance = start_instance;
 102    info.instance_count = instance_count;
 103    info.min_index = start;
 104    info.max_index = start + count - 1;
 105
 106    pipe->draw_vbo(pipe, &info);
 107 }
 108
 109 static inline void
 110 util_draw_elements_instanced(struct pipe_context *pipe,
 111                              unsigned index_size,
 112                              int index_bias,
 113                              enum pipe_prim_type mode,
 114                              uint start,
 115                              uint count,
 116                              uint start_instance,
 117                              uint instance_count)
 118 {
 119    struct pipe_draw_info info;
 120
 121    util_draw_init_info(&info);
 122    info.index_size = index_size;
 123    info.mode = mode;
 124    info.start = start;
 125    info.count = count;
 126    info.index_bias = index_bias;
 127    info.start_instance = start_instance;
 128    info.instance_count = instance_count;
 129
 130    pipe->draw_vbo(pipe, &info);
 131 }
 132
 133
 134 /* This converts an indirect draw into a direct draw by mapping the indirect
 135  * buffer, extracting its arguments, and calling pipe->draw_vbo.
 136  */
 137 void
 138 util_draw_indirect(struct pipe_context *pipe,
 139                    const struct pipe_draw_info *info);
 140
 141
 142 unsigned
 143 util_draw_max_index(
 144       const struct pipe_vertex_buffer *vertex_buffers,
 145       const struct pipe_vertex_element *vertex_elements,
 146       unsigned nr_vertex_elements,
 147       const struct pipe_draw_info *info);
 148
 149
 150 #ifdef __cplusplus
 151 }
 152 #endif
 153
 154 #endif /* !U_DRAW_H */