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  1. /*
  2.  * Copyright 2009 VMware, Inc.
  3.  * All Rights Reserved.
  4.  *
  5.  * Permission is hereby granted, free of charge, to any person obtaining a
  6.  * copy of this software and associated documentation files (the "Software"),
  7.  * to deal in the Software without restriction, including without limitation
  8.  * on the rights to use, copy, modify, merge, publish, distribute, sub
  9.  * license, and/or sell copies of the Software, and to permit persons to whom
  10.  * the Software is furnished to do so, subject to the following conditions:
  11.  *
  12.  * The above copyright notice and this permission notice (including the next
  13.  * paragraph) shall be included in all copies or substantial portions of the
  14.  * Software.
  15.  *
  16.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18.  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
  19.  * VMWARE AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  20.  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  21.  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  22.  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  23.  */
  24.  
  25. #ifndef U_INDICES_H
  26. #define U_INDICES_H
  27.  
  28. #include "pipe/p_compiler.h"
  29.  
  30. #define PV_FIRST      0
  31. #define PV_LAST       1
  32. #define PV_COUNT      2
  33.  
  34. /* primitive restart disable/enable flags */
  35. #define PR_DISABLE 0
  36. #define PR_ENABLE 1
  37. #define PR_COUNT 2
  38. /**
  39.  * Index translator function (for glDrawElements() case)
  40.  *
  41.  * \param in     the input index buffer
  42.  * \param start  the index of the first vertex (pipe_draw_info::start)
  43.  * \param nr     the number of vertices (pipe_draw_info::count)
  44.  * \param out    output buffer big enough or nr vertices (of
  45.  *    @out_index_size bytes each)
  46.  */
  47. typedef void (*u_translate_func)( const void *in,
  48.                                   unsigned start,
  49.                                   unsigned in_nr,
  50.                                   unsigned out_nr,
  51.                                   unsigned restart_index,
  52.                                   void *out );
  53.  
  54. /**
  55.  * Index generator function (for glDrawArrays() case)
  56.  *
  57.  * \param start  the index of the first vertex (pipe_draw_info::start)
  58.  * \param nr     the number of vertices (pipe_draw_info::count)
  59.  * \param out    output buffer big enough or nr vertices (of
  60.  *    @out_index_size bytes each)
  61.  */
  62. typedef void (*u_generate_func)( unsigned start,
  63.                                  unsigned nr,
  64.                                  void *out );
  65.  
  66.  
  67. /* Return codes describe the translate/generate operation.  Caller may
  68.  * be able to reuse translated indices under some circumstances.
  69.  */
  70. #define U_TRANSLATE_ERROR  -1
  71. #define U_TRANSLATE_NORMAL  1
  72. #define U_TRANSLATE_MEMCPY  2
  73. #define U_GENERATE_LINEAR   3
  74. #define U_GENERATE_REUSABLE 4
  75. #define U_GENERATE_ONE_OFF  5
  76.  
  77.  
  78. void u_index_init( void );
  79.  
  80. int u_index_translator( unsigned hw_mask,
  81.                         unsigned prim,
  82.                         unsigned in_index_size,
  83.                         unsigned nr,
  84.                         unsigned in_pv,   /* API */
  85.                         unsigned out_pv,  /* hardware */
  86.                         unsigned prim_restart,
  87.                         unsigned *out_prim,
  88.                         unsigned *out_index_size,
  89.                         unsigned *out_nr,
  90.                         u_translate_func *out_translate );
  91.  
  92. /* Note that even when generating it is necessary to know what the
  93.  * API's PV is, as the indices generated will depend on whether it is
  94.  * the same as hardware or not, and in the case of triangle strips,
  95.  * whether it is first or last.
  96.  */
  97. int u_index_generator( unsigned hw_mask,
  98.                        unsigned prim,
  99.                        unsigned start,
  100.                        unsigned nr,
  101.                        unsigned in_pv,   /* API */
  102.                        unsigned out_pv,  /* hardware */
  103.                        unsigned *out_prim,
  104.                        unsigned *out_index_size,
  105.                        unsigned *out_nr,
  106.                        u_generate_func *out_generate );
  107.  
  108.  
  109. void u_unfilled_init( void );
  110.  
  111. int u_unfilled_translator( unsigned prim,
  112.                            unsigned in_index_size,
  113.                            unsigned nr,
  114.                            unsigned unfilled_mode,
  115.                            unsigned *out_prim,
  116.                            unsigned *out_index_size,
  117.                            unsigned *out_nr,
  118.                            u_translate_func *out_translate );
  119.  
  120. int u_unfilled_generator( unsigned prim,
  121.                           unsigned start,
  122.                           unsigned nr,
  123.                           unsigned unfilled_mode,
  124.                           unsigned *out_prim,
  125.                           unsigned *out_index_size,
  126.                           unsigned *out_nr,
  127.                           u_generate_func *out_generate );
  128.  
  129.  
  130.  
  131.  
  132. #endif
  133.