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  1. /*
  2. Copyright (C) 1996-1997 Id Software, Inc.
  3.  
  4. This program is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU General Public License
  6. as published by the Free Software Foundation; either version 2
  7. of the License, or (at your option) any later version.
  8.  
  9. This program is distributed in the hope that it will be useful,
  10. but WITHOUT ANY WARRANTY; without even the implied warranty of
  11. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
  12.  
  13. See the GNU General Public License for more details.
  14.  
  15. You should have received a copy of the GNU General Public License
  16. along with this program; if not, write to the Free Software
  17. Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18.  
  19. */
  20. //
  21. // d_scana.s
  22. // x86 assembly-language turbulent texture mapping code
  23. //
  24.  
  25. #include "asm_i386.h"
  26. #include "quakeasm.h"
  27. #include "asm_draw.h"
  28. #include "d_ifacea.h"
  29.  
  30. #if id386
  31.  
  32.         .data
  33.  
  34.         .text
  35.  
  36. //----------------------------------------------------------------------
  37. // turbulent texture mapping code
  38. //----------------------------------------------------------------------
  39.  
  40.         .align 4
  41. .globl C(D_DrawTurbulent8Span)
  42. C(D_DrawTurbulent8Span):
  43.         pushl   %ebp                            // preserve caller's stack frame pointer
  44.         pushl   %esi                            // preserve register variables
  45.         pushl   %edi
  46.         pushl   %ebx
  47.  
  48.         movl    C(r_turb_s),%esi
  49.         movl    C(r_turb_t),%ecx
  50.         movl    C(r_turb_pdest),%edi
  51.         movl    C(r_turb_spancount),%ebx
  52.  
  53. Llp:
  54.         movl    %ecx,%eax
  55.         movl    %esi,%edx
  56.         sarl    $16,%eax
  57.         movl    C(r_turb_turb),%ebp
  58.         sarl    $16,%edx
  59.         andl    $(CYCLE-1),%eax
  60.         andl    $(CYCLE-1),%edx
  61.         movl    (%ebp,%eax,4),%eax
  62.         movl    (%ebp,%edx,4),%edx
  63.         addl    %esi,%eax
  64.         sarl    $16,%eax
  65.         addl    %ecx,%edx
  66.         sarl    $16,%edx
  67.         andl    $(TURB_TEX_SIZE-1),%eax
  68.         andl    $(TURB_TEX_SIZE-1),%edx
  69.         shll    $6,%edx
  70.         movl    C(r_turb_pbase),%ebp
  71.         addl    %eax,%edx
  72.         incl    %edi
  73.         addl    C(r_turb_sstep),%esi
  74.         addl    C(r_turb_tstep),%ecx
  75.         movb    (%ebp,%edx,1),%dl
  76.         decl    %ebx
  77.         movb    %dl,-1(%edi)
  78.         jnz             Llp
  79.  
  80.         movl    %edi,C(r_turb_pdest)
  81.  
  82.         popl    %ebx                            // restore register variables
  83.         popl    %edi
  84.         popl    %esi
  85.         popl    %ebp                            // restore caller's stack frame pointer
  86.         ret
  87.  
  88. #endif  // id386
  89.  
  90.