1 ; $Id: tmapfade.asm,v 1.3 2004-08-28 23:17:46 schaffner Exp $
2 ;THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
3 ;SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO
4 ;END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
5 ;ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
6 ;IN USING, DISPLAYING, AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
7 ;SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
8 ;FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
9 ;CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS
10 ;AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
11 ;COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
18 global _asm_tmap_scanline_shaded
19 global asm_tmap_scanline_shaded
23 %include "tmap_inc.asm"
28 ; --------------------------------------------------------------------------------------------------
30 ; _xleft fixed point left x coordinate
31 ; _xright fixed point right x coordinate
32 ; _y fixed point y coordinate
33 ;**; _pixptr address of source pixel map
35 ; for (x = (int) xleft; x <= (int) xright; x++) {
36 ; _setcolor(read_pixel_from_tmap(srcb,((int) (u/z)) & 63,((int) (v/z)) & 63));
43 _asm_tmap_scanline_shaded:
44 asm_tmap_scanline_shaded:
48 ; mov fs, [_gr_fade_table_selector] ; DPH: No selectors in windows
50 ; Setup for loop: _loop_count iterations = (int) xright - (int) xleft
51 ; edi initial row pointer = y*320+x
53 ; set edi = address of first pixel to modify
55 cmp edi,_window_bottom
58 imul edi,[_bytes_per_row]
65 add edi,[_write_buffer]
67 ; set _loop_count = # of iterations
70 cmp eax,[_window_right]
72 mov eax,[_window_right]
73 eax_ok1: cmp eax,[_window_left]
75 mov eax,[_window_left]
80 cmp eax,[_window_width]
82 mov eax,[_window_width]
84 mov [_loop_count], eax
87 mov ch,[_tmap_flat_shade_value]
90 ;_size = (_end1 - _start1)/num_iters
94 inc eax ; sort of a hack, but we can get -1 here and want to be graceful
95 jns j_eax_ok1 ; if we jump, we had -1, which is kind of ok, if not, we int 3
96 int 3 ; oops, going to jump behind _start1, very bad...
97 sub eax,eax ; ok to continue
98 j_eax_ok1: imul eax,eax,(_end1 - _start1)/num_iters
99 add eax, _start1 ;originally offset _start1
106 mov cl, [edi] ; get pixel
107 mov al, [_gr_fade_table + ecx] ; darken pixel
108 mov [edi], al ; write pixel
109 inc edi ; goto next pixel