;THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX ;SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO ;END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A ;ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS ;IN USING, DISPLAYING, AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS ;SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE ;FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE ;CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS ;AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE. ;COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED. ; ; $Source: /cvs/cvsroot/d2x/texmap/tmap_flt.asm,v $ ; $Revision: 1.1.1.1 $ ; $Author: bradleyb $ ; $Date: 2001-01-19 03:30:16 $ ; ; Flat shader derived from texture mapper (kind of slow) ; ; $Log: not supported by cvs2svn $ ; Revision 1.1.1.1 1999/06/14 22:13:53 donut ; Import of d1x 1.37 source. ; ; Revision 1.10 1995/02/20 18:22:53 john ; Put all the externs in the assembly modules into tmap_inc.asm. ; Also, moved all the C versions of the inner loops into a new module, ; scanline.c. ; ; Revision 1.9 1995/02/20 17:08:51 john ; Added code so that you can build the tmapper with no assembly! ; ; Revision 1.8 1994/12/02 23:29:21 mike ; change jb/ja to jl/jg. ; ; Revision 1.7 1994/11/12 16:39:35 mike ; jae to ja. ; ; Revision 1.6 1994/08/09 11:27:53 john ; Added cthru mode. ; ; Revision 1.5 1994/07/08 17:43:11 john ; Added flat-shaded-zbuffered polygon. ; ; Revision 1.4 1994/04/08 16:25:43 mike ; optimize inner loop of flat shader. ; ; Revision 1.3 1994/03/31 08:34:20 mike ; Optimized (well, speeded-up) inner loop for tmap-based flat shader. ; ; Revision 1.2 1993/11/22 10:24:57 mike ; *** empty log message *** ; ; Revision 1.1 1993/09/08 17:29:46 mike ; Initial revision ; ; ; [BITS 32] global _asm_tmap_scanline_flat global asm_tmap_scanline_flat [SECTION .data] %include "tmap_inc.asm" [SECTION .text] ; -------------------------------------------------------------------------------------------------- ; Enter: ; _xleft fixed point left x coordinate ; _xright fixed point right x coordinate ; _y fixed point y coordinate ;**; _pixptr address of source pixel map ; for (x = (int) xleft; x <= (int) xright; x++) { ; _setcolor(read_pixel_from_tmap(srcb,((int) (u/z)) & 63,((int) (v/z)) & 63)); ; _setpixel(x,y); ; ; z += dz_dx; ; } align 4 _asm_tmap_scanline_flat: asm_tmap_scanline_flat: pusha ; Setup for loop: _loop_count iterations = (int) xright - (int) xleft ;**; esi source pixel pointer = pixptr ; edi initial row pointer = y*320+x ; set esi = pointer to start of texture map data ;** mov esi,_pixptr ; set edi = address of first pixel to modify mov edi,[_fx_y] cmp edi,[_window_bottom] ja near _none_to_do imul edi,[_bytes_per_row] mov eax,[_fx_xleft] test eax, eax jns eax_ok sub eax,eax eax_ok: add edi,eax add edi,[_write_buffer] ; set _loop_count = # of iterations mov eax,[_fx_xright] cmp eax,[_window_right] jl eax_ok1 mov eax,[_window_right] eax_ok1: cmp eax,[_window_left] jg eax_ok2 mov eax,[_window_left] eax_ok2: mov ebx,[_fx_xleft] sub eax,ebx js _none_to_do cmp eax,[_window_width] jbe _ok_to_do mov eax,[_window_width] dec eax _ok_to_do: mov ecx,eax ; edi = destination pixel pointer cmp dword [_tmap_flat_cthru_table], 0 jne do_flat_cthru mov al,[_tmap_flat_color] ; word align inc ecx test edi,1 je edi_even mov [edi],al inc edi dec ecx je _none_to_do edi_even: shr ecx,1 je _no_full_words mov ah,al rep stosw _no_full_words: adc ecx,ecx ; if cy set, then write one more pixel (ecx == 0) rep stosb ; write 0 or 1 pixel _none_to_do: popa ret do_flat_cthru: mov esi, [_tmap_flat_cthru_table] xor eax, eax cmp ecx, 0 je _none_to_do ; edi = dest, esi = table, ecx = count flat_cthru_loop: mov al, [edi] ; get already drawn pixel mov al, [eax+esi] ; xlat thru cthru table mov [edi],al ; write it inc edi dec ecx jnz flat_cthru_loop popa ret