1 ;THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
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7 ;FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
8 ;CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS
9 ;AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
10 ;COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
17 global _asm_tmap_scanline_shaded
18 global asm_tmap_scanline_shaded
22 %include "tmap_inc.asm"
27 ; --------------------------------------------------------------------------------------------------
29 ; _xleft fixed point left x coordinate
30 ; _xright fixed point right x coordinate
31 ; _y fixed point y coordinate
32 ;**; _pixptr address of source pixel map
34 ; for (x = (int) xleft; x <= (int) xright; x++) {
35 ; _setcolor(read_pixel_from_tmap(srcb,((int) (u/z)) & 63,((int) (v/z)) & 63));
42 _asm_tmap_scanline_shaded:
43 asm_tmap_scanline_shaded:
47 ; mov fs, [_gr_fade_table_selector] ; DPH: No selectors in windows
49 ; Setup for loop: _loop_count iterations = (int) xright - (int) xleft
50 ; edi initial row pointer = y*320+x
52 ; set edi = address of first pixel to modify
54 cmp edi,_window_bottom
57 imul edi,[_bytes_per_row]
64 add edi,[_write_buffer]
66 ; set _loop_count = # of iterations
69 cmp eax,[_window_right]
71 mov eax,[_window_right]
72 eax_ok1: cmp eax,[_window_left]
74 mov eax,[_window_left]
79 cmp eax,[_window_width]
81 mov eax,[_window_width]
83 mov [_loop_count], eax
86 mov ch,[_tmap_flat_shade_value]
89 ;_size = (_end1 - _start1)/num_iters
93 inc eax ; sort of a hack, but we can get -1 here and want to be graceful
94 jns j_eax_ok1 ; if we jump, we had -1, which is kind of ok, if not, we int 3
95 int 3 ; oops, going to jump behind _start1, very bad...
96 sub eax,eax ; ok to continue
97 j_eax_ok1: imul eax,eax,(_end1 - _start1)/num_iters
98 add eax, _start1 ;originally offset _start1
105 mov cl, [edi] ; get pixel
106 mov al, [_gr_fade_table + ecx] ; darken pixel
107 mov [edi], al ; write pixel
108 inc edi ; goto next pixel