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12 ; $Source: /cvs/cvsroot/d2x/texmap/tmapfade.asm,v $
13 ; $Revision: 1.1.1.1 $
15 ; $Date: 2001-01-19 03:30:16 $
19 ; $Log: not supported by cvs2svn $
20 ; Revision 1.1.1.1 1999/06/14 22:13:53 donut
21 ; Import of d1x 1.37 source.
23 ; Revision 1.6 1995/02/20 18:23:01 john
24 ; Put all the externs in the assembly modules into tmap_inc.asm.
25 ; Also, moved all the C versions of the inner loops into a new module,
28 ; Revision 1.5 1995/02/20 17:09:15 john
29 ; Added code so that you can build the tmapper with no assembly!
31 ; Revision 1.4 1994/12/02 23:29:36 mike
32 ; change jb/ja to jl/jg.
34 ; Revision 1.3 1994/11/30 00:57:36 mike
35 ; *** empty log message ***
37 ; Revision 1.2 1994/10/06 18:38:49 john
38 ; Added the ability to fade a scanline by calling gr_upoly_tmap
39 ; with Gr_scanline_darkening_level with a value < MAX_FADE_LEVELS.
41 ; Revision 1.1 1994/10/06 18:04:42 john
46 global _asm_tmap_scanline_shaded
47 global asm_tmap_scanline_shaded
51 %include "tmap_inc.asm"
56 ; --------------------------------------------------------------------------------------------------
58 ; _xleft fixed point left x coordinate
59 ; _xright fixed point right x coordinate
60 ; _y fixed point y coordinate
61 ;**; _pixptr address of source pixel map
63 ; for (x = (int) xleft; x <= (int) xright; x++) {
64 ; _setcolor(read_pixel_from_tmap(srcb,((int) (u/z)) & 63,((int) (v/z)) & 63));
71 _asm_tmap_scanline_shaded:
72 asm_tmap_scanline_shaded:
76 ; mov fs, [_gr_fade_table_selector] ; DPH: No selectors in windows
78 ; Setup for loop: _loop_count iterations = (int) xright - (int) xleft
79 ; edi initial row pointer = y*320+x
81 ; set edi = address of first pixel to modify
83 cmp edi,_window_bottom
86 imul edi,[_bytes_per_row]
93 add edi,[_write_buffer]
95 ; set _loop_count = # of iterations
98 cmp eax,[_window_right]
100 mov eax,[_window_right]
101 eax_ok1: cmp eax,[_window_left]
103 mov eax,[_window_left]
108 cmp eax,[_window_width]
110 mov eax,[_window_width]
112 mov [_loop_count], eax
115 mov ch,[_tmap_flat_shade_value]
118 ;_size = (_end1 - _start1)/num_iters
120 sub eax,[_loop_count]
122 inc eax ; sort of a hack, but we can get -1 here and want to be graceful
123 jns j_eax_ok1 ; if we jump, we had -1, which is kind of ok, if not, we int 3
124 int 3 ; oops, going to jump behind _start1, very bad...
125 sub eax,eax ; ok to continue
126 j_eax_ok1: imul eax,eax,(_end1 - _start1)/num_iters
127 add eax, _start1 ;originally offset _start1
134 mov cl, [edi] ; get pixel
135 mov al, [_gr_fade_table + ecx] ; darken pixel
136 mov [edi], al ; write pixel
137 inc edi ; goto next pixel