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  1. /*
  2.  * This file is part of the DXX-Rebirth project <https://www.dxx-rebirth.com/>.
  3.  * It is copyright by its individual contributors, as recorded in the
  4.  * project's Git history.  See COPYING.txt at the top level for license
  5.  * terms and a link to the Git history.
  6.  */
  7. #pragma once
  8. /*
  9. THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
  10. SOFTWARE CORPORATION ("PARALLAX").  PARALLAX, IN DISTRIBUTING THE CODE TO
  11. END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
  12. ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
  13. IN USING, DISPLAYING,  AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
  14. SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
  15. FREE PURPOSES.  IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
  16. CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES.  THE END-USER UNDERSTANDS
  17. AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
  18. COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
  19. */
  20.  
  21. /*
  22.  *
  23.  * Local include file for texture mapper library -- NOT to be included by users.
  24.  *
  25.  */
  26.  
  27. //      Local include file for texture map library.
  28.  
  29. #include "maths.h"
  30. #include "pstypes.h"
  31.  
  32. #ifdef __cplusplus
  33. #include <cstddef>
  34. #include "dxxsconf.h"
  35. #include "dsx-ns.h"
  36. #include <array>
  37.  
  38. namespace dcx {
  39.  
  40. #if !DXX_USE_OGL
  41. struct g3ds_tmap;
  42.  
  43. extern  int prevmod(int val,int modulus);
  44. extern  int succmod(int val,int modulus);
  45.  
  46. fix compute_dx_dy(const g3ds_tmap &t, int top_vertex,int bottom_vertex, fix recip_dy);
  47. void compute_y_bounds(const g3ds_tmap &t, int &vlt, int &vlb, int &vrt, int &vrb,int &bottom_y_ind);
  48.  
  49. extern int      fx_y,fx_xleft,fx_xright;
  50. extern const unsigned char *pixptr;
  51. // texture mapper scanline renderers
  52. // Interface variables to assembler code
  53. extern  fix     fx_u,fx_v,fx_z,fx_du_dx,fx_dv_dx,fx_dz_dx;
  54. extern  fix     fx_dl_dx,fx_l;
  55. extern  int     bytes_per_row;
  56. extern  unsigned char *write_buffer;
  57.  
  58. extern uint8_t tmap_flat_color;
  59.  
  60. constexpr std::integral_constant<std::size_t, 641> FIX_RECIP_TABLE_SIZE{};      //increased from 321 to 641, since this res is now quite achievable.. slight fps boost -MM
  61. extern const std::array<fix, FIX_RECIP_TABLE_SIZE> fix_recip_table;
  62. static inline fix fix_recip(unsigned i)
  63. {
  64.         if (i < fix_recip_table.size())
  65.                 return fix_recip_table[i];
  66.         else
  67.                 return F1_0 / i;
  68. }
  69. #endif
  70.  
  71. }
  72.  
  73. #endif
  74.  
  75.