Initial checkin of software rendering bits and bobs.

git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@20 fc73d0e0-1445-4013-8a0c-d673dee63da5

engine/sw/asm_draw.h

@@ -0,0 +1,154 @@
+/*
+Copyright (C) 1996-1997 Id Software, Inc.
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
+
+See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+*/
+//
+// asm_draw.h
+//
+// Include file for asm drawing routines.
+//
+
+//
+// !!! note that this file must match the corresponding C structures at all
+// times !!!
+//
+
+// !!! if this is changed, it must be changed in r_local.h too !!!
+#define	NEAR_CLIP	0.01
+
+// !!! if this is changed, it must be changed in r_local.h too !!!
+#define	CYCLE	128
+
+// espan_t structure
+// !!! if this is changed, it must be changed in r_shared.h too !!!
+#define espan_t_u    	0
+#define espan_t_v	    4
+#define espan_t_count   8
+#define espan_t_pnext	12
+#define espan_t_size    16
+
+// sspan_t structure
+// !!! if this is changed, it must be changed in d_local.h too !!!
+#define sspan_t_u    	0
+#define sspan_t_v	    4
+#define sspan_t_count   8
+#define sspan_t_size    12
+
+// spanpackage_t structure
+// !!! if this is changed, it must be changed in d_polyset.c too !!!
+#define spanpackage_t_pdest				0
+#define spanpackage_t_pz				4
+#define spanpackage_t_count				8
+#define spanpackage_t_ptex				12
+#define spanpackage_t_sfrac				16
+#define spanpackage_t_tfrac				20
+#define spanpackage_t_light				24
+#define spanpackage_t_zi				28
+#define spanpackage_t_size				32 
+
+// edge_t structure
+// !!! if this is changed, it must be changed in r_shared.h too !!!
+#define et_u			0
+#define et_u_step		4
+#define et_prev			8
+#define et_next			12
+#define et_surfs		16
+#define et_nextremove	20
+#define et_nearzi		24
+#define et_owner		28
+#define et_size			32
+
+// surf_t structure
+// !!! if this is changed, it must be changed in r_shared.h too !!!
+#define SURF_T_SHIFT	6
+#define st_next			0
+#define st_prev			4
+#define st_spans		8
+#define st_key			12
+#define st_last_u		16
+#define st_spanstate	20
+#define st_flags		24
+#define st_data			28
+#define st_entity		32
+#define st_nearzi		36
+#define st_insubmodel	40
+#define st_d_ziorigin	44
+#define st_d_zistepu	48
+#define st_d_zistepv	52
+#define st_pad			56
+#define st_size			64
+
+// clipplane_t structure
+// !!! if this is changed, it must be changed in r_local.h too !!!
+#define cp_normal		0
+#define cp_dist			12
+#define cp_next			16
+#define cp_leftedge		20
+#define cp_rightedge	21
+#define cp_reserved		22
+#define cp_size			24
+
+// medge_t structure
+// !!! if this is changed, it must be changed in model.h too !!!
+#define me_v				0
+#define me_cachededgeoffset	4
+#define me_size				8
+
+// mvertex_t structure
+// !!! if this is changed, it must be changed in model.h too !!!
+#define mv_position		0
+#define mv_size			12
+
+// refdef_t structure
+// !!! if this is changed, it must be changed in render.h too !!!
+#define rd_vrect					0
+#define rd_aliasvrect				20
+#define rd_vrectright				40
+#define rd_vrectbottom				44
+#define rd_aliasvrectright			48
+#define rd_aliasvrectbottom			52
+#define rd_vrectrightedge			56
+#define rd_fvrectx					60
+#define rd_fvrecty					64
+#define rd_fvrectx_adj				68
+#define rd_fvrecty_adj				72
+#define rd_vrect_x_adj_shift20		76
+#define rd_vrectright_adj_shift20	80
+#define rd_fvrectright_adj			84
+#define rd_fvrectbottom_adj			88
+#define rd_fvrectright				92
+#define rd_fvrectbottom				96
+#define rd_horizontalFieldOfView	100
+#define rd_xOrigin					104
+#define rd_yOrigin					108
+#define rd_vieworg					112
+#define rd_viewangles				124
+#define rd_ambientlight				136
+#define rd_flags					140
+#define rd_currentplayernum			144
+#define rd_size						148
+
+// mtriangle_t structure
+// !!! if this is changed, it must be changed in model.h too !!!
+#define mtri_facesfront		0
+#define mtri_vertindex		4
+#define mtri_stindex		16
+#define mtri_size			28	// !!! if this changes, array indexing in !!!
+								// !!! d_polysa.s must be changed to match !!!
+#define mtri_shift			4
+