source: golgotha/src/render/software/solid_fill_asm.cc @ 80

Last change on this file since 80 was 80, checked in by Sam Hocevar, 11 years ago
  • Adding the Golgotha source code. Not sure what's going to be interesting in there, but since it's all public domain, there's certainly stuff to pick up.
File size: 1.2 KB
Line 
1/********************************************************************** <BR>
2  This file is part of Crack dot Com's free source code release of
3  Golgotha. <a href="http://www.crack.com/golgotha_release"> <BR> for
4  information about compiling & licensing issues visit this URL</a>
5  <PRE> If that doesn't help, contact Jonathan Clark at
6  golgotha_source@usa.net (Subject should have "GOLG" in it)
7***********************************************************************/
8
9#include "software/r1_software_globals.hh"
10
11void texture_scanline_solid_fill(w16 *start_pixel,
12                                 sw32 start_x,
13                                 void *left,//solid_blend_span *left,
14                                 sw32 width)
15
16  __asm
17  {       
18    mov edi,left
19    mov ecx,width
20
21    mov eax,[edi]solid_blend_span.color   
22    mov edi,start_pixel
23
24    add edi,start_x
25    nop
26
27    test ecx,1       //even # of pixels?
28    jz   start_loop  //yes, begin looped drawing
29
30    //no, draw single pixel 1st   
31    mov word ptr [edi],ax
32    add edi,2
33    dec ecx
34    jz  done
35
36start_loop:
37    shr ecx,1
38    rep stosd   
39
40done:
41
42  }
43}
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