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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
     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 */
    155