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Text File | 1994-01-01 | 10.7 KB | 451 lines

COMMENT $ /* Data structures for 3D modelling */ /* Written for assembly by Dave Stampe, December 1993 */ /* base on 3dstruct.h */ /* This code is part of the REND386 project, created by Dave Stampe and Bernie Roehl. Copyright 1992, 1993, 1994 by Dave Stampe and Bernie Roehl. May be freely used to write software for release into the public domain; all commercial endeavours MUST contact BOTH Bernie Roehl and Dave Stampe for permission to incorporate any part of this software into their products! Usually there is no charge for under 50-100 items for low-cost or shareware, and terms are reasonable. Any royalties are used for development, so equipment is often acceptable payment. ATTRIBUTION: If you use any part of this source code or the libraries in your projects, you must give attribution to REND386, Dave Stampe, and Bernie Roehl in your documentation, source code, and at startup of your program. Let's keep the freeware ball rolling! No more code ripoffs please. CONTACTS: dstampe@psych.toronto.edu, broehl@sunee.uwaterloo.ca See the COPYRITE.H file for more information. */ /* NOTE ON FORMATS: <nn.ff> means that nn bits are available as the integer part, and ff bits are used as a fractional part. Multiply a float by 2^ff to get a long value to feed in. World coordinates should be kept below signed 24 bits (16.7M) to assure no errors. This allows a range of 1mm->16.7 km, which should be plenty! Angles are in <16.16> format, where the integer part is in degrees. */ $ ; Actual structure of a homogenous matrix MATRIX STRUC MAT_xx dd ? ; col. 1 MAT_yx dd ? MAT_zx dd ? MAT_xy dd ? ; col. 2 MAT_yy dd ? MAT_zy dd ? MAT_xz dd ? ; col. 3 MAT_yz dd ? MAT_zz dd ? MAT_xt dd ? ; translations MAT_yt dd ? MAT_zt dd ? MATRIX ENDS ;/* new vertex copies, internal to renderer */ ;typedef struct nV NVERTEX; ;struct nV{ ; long x, y, z; /* viewport coordinates (used for saving time) */ ; long xs, ys ; /* screen coordinates */ ; unsigned char outcode; /* XY clip outcodes */ ; unsigned char perspect; /* flags perspective done */ ; }; NVERTEX STRUC NV_x dd ? NV_y dd ? NV_z dd ? NV_xs dd ? NV_ys dd ? NV_ocode db ? NV_persp db ? NVERTEX ENDS OLEFT equ 1 ; /* XY outcode bits */ ORIGHT equ 2 OTOP equ 4 OBOTTOM equ 8 ;/* world database vertices */ ;/* object coords are referenced to object */ ;/* world coords are updated when moving or rotating object */ ;/* all others are renderer workspace */ ; ;typedef struct { ; long ox, oy, oz; /* object coordinates */ ; long x, y, z; /* world coordinates */ ; long cz; /* converted Z coord */ ; NVERTEX *new_copy; /* non-zero if x and y transformed */ ; unsigned char z_transformed; /* non-zero if z has been transformed */ ; unsigned char z_outcode; /* 1 set if hither, 2 set if yon */ ; } VERTEX; VERTEX STRUC V_ox dd ? V_oy dd ? V_oz dd ? V_x dd ? V_y dd ? V_z dd ? V_cz dd ? V_nvptr dd ? V_zxflag db ? V_zocode db ? VERTEX ENDS OHITHER equ 16 ; /* Z outcode bits */ OYON equ 32 ;/* world database polys */ ;/* object-based normal must be rotated to world copy with object */ ;/* color will have 8-bit color, 8-bit reflectance field */ ; ;typedef struct { ; unsigned color; /* color (not used yet-- will set chroma, reflectance */ ; VERTEX **points; /* array of pointers to the vertices of this polygon */ ; int npoints; /* number of entries in points[] */ ; long onormalx, ; onormaly, ; onormalz; /* unit length surface normal (VISOBJ) */ ; long normalx, ; normaly, ; normalz; /* unit length surface normal (WORLD)*/ ; struct _object *object; ; } POLY; POLY STRUC P_color dw ? P_points dd ? P_npoints dw ? P_onormx dd ? P_onormy dd ? P_onormz dd ? P_normx dd ? P_normy dd ? P_normz dd ? P_objptr dd ? POLY ENDS ;/* renderer poly copy */ ;/* paernt points back to original poly for lighting */ ;/* color computed by cosine lighting */ ;/* maxz is deepest poly point for sorting */ ; ;typedef struct { ; int npoints; /* number of entries in points[] MUST BE FIRST */ ; POLY *parent; ; unsigned color; /* color after illumination */ ; long maxz; /* maximum Z value (for sorting) */ ; } NPOLY; NPOLY STRUC NP_npoints dw ? NP_parent dd ? NP_color dw ? NP_maxz dd ? NPOLY ENDS ;typedef struct { NPOLY *ptr; long depth; } DSORT; /* used for depth sorting */ DSORT STRUC DS_ptr dd ? DS_depth dd ? DSORT ENDS ;typedef struct _rep { /* a representation for an object */ ; long size; /* if the object is bigger than this, use this rep */ ; int nverts, npolys; /* number of vertices, number of polys */ ; VERTEX *verts; /* array of vertices */ ; POLY *polys; /* array of polygons */ ; struct _rep *next; /* pointer to next rep in list */ ; long update_count; /* inc. every time rep moves */ ; unsigned flags; ; } REP; REPR STRUC R_size dw ? R_nverts dw ? R_npolys dw ? R_verts dd ? R_polys dd ? R_next dd ? R_ucount dd ? R_flags dw ? REPR ENDS ;/* world database object */ ;/* sphx, sphy, sphz, sphr used for sphere object clipping */ ; ;#define OBJ_FLAG_MASK 0x7C00 ;#define OBJ_DEPTH_MASK 0x03FF ; ; ;struct _object ; { ; unsigned int oflags; ;#define OBJ_REPLOCK 0x0400 ;#define OBJ_NONSEL 0x0800 /* can't be selected (i.e. pointer) */ ;#define OBJ_INVIS 0x1000 ;#define OBJ_HIGHLIGHTED 0x2000 ;#define OBJLIST_HEADER 0x4000 ;#define IS_VISOBJ 0x8000 /* required by renderer: it will set */ ; ;#define DEEPEST 0x0000 /* sort polys by deepest point */ ;#define ATBACK 0x0001 /* push this object's poly's waaaay back */ ;#define AVERAGE 0x0002 /* sort polys by average depth */ ; ;#define BYOBJECT 0x0100 /* sort by object */ ;#define BYPOLY 0x0000 /* put polys in world before sort */ ; ; struct _object *prev; ; struct _object *nnext; ; ; void *owner; /* for example, a body segment description struct */ ; REP *replist; /* pointer to list of representations */ ; REP *current_rep; /* the currently-active rep */ ; ; long osphx, osphy, osphz; /* object-coord sphere center */ ; long sphx, sphy, sphz, sphr; /* bounding sphere center and radius */ ; long update_count; /* inc. every time object moved */ ; }; ; VISOBJ STRUC O_flags dw ? O_prev dd ? O_nnext dd ? O_owner dd ? O_replist dd ? O_currep dd ? O_osphx dd ? O_osphy dd ? O_osphz dd ? O_sphx dd ? O_sphy dd ? O_sphz dd ? O_sphr dd ? O_ucount dd ? VISOBJ ENDS OBJ_FLAG_MASK equ 7C00h OBJ_DEPTH_MASK equ 03FFh OBJ_REPLOCK equ 0400h OBJ_NONSEL equ 0800h ;/* can't be selected (i.e. pointer) */ OBJ_INVIS equ 1000h OBJ_HIGHLIGHTED equ 2000h OBJLIST_HEADER equ 4000h IS_VISOBJ equ 8000h ;/* required by renderer: it will set */ DEEPEST equ 0000h ;/* sort polys by deepest point */ ATBACK equ 0001h ;/* push this object's poly's waaaay back */ AVERAGE equ 0002h ;/* sort polys by average depth */ BYOBJECT equ 0100h ;/* sort by object */ BYPOLY equ 0000h ;/* put polys in world before sort */ ;/* world database object list head */ ;/* dual linked for fast remove/insert needed for splits */ ; ;typedef struct _objlist ; { ; unsigned int oflags; ; ; struct _object *prev; ; struct _object *nnext; ; } OBJLIST; OBJLIST STRUC OL_flags dw ? OL_prev dd ? OL_nnext dd ? OBJLIST ENDS ;/* renderer viewpoint/screen control structure */ ;/* viewoint in X, Y, Z coords */ ;/* pan, tilt, roll in (float*65536) formats */ ;/* zoom is equiv. to magnification from 90 deg. FOV (also float*65536) */ ;/* aspect sets how much to magnify Y more than X to fix up displays */ ;/* light source point in world coordinates */ ;/* left, right, top, bottom set edges of screen */ ;/* hither sets closest point: keep >16 for best range of world coords */ ;/* yon sets max. distance: keep it 1<<26 if not used */ ;/* all others are renderer workspace */ ; ;typedef struct { ; /* VIEWPOINT */ ; long zoom; /* <16.16> 1/tan(H FOV/2) 0.5 to 16 */ ; /* SCREEN DATA */ ; long left,right; /* <25.0> clipping planes */ ; long top, bottom; ; long hither, yon; /* <25.0> near and far clipping planes */ ; long aspect; /* <16.16> x:y fixup factor (magnify Y by..*/ ; ; /* RENDERING CONTROL */ ; unsigned flags; /* 16 bits of flags */ ; ; /* ADVANCED SCREEN DATA */ ; long x_offset, y_offset; /* amount to move screen center in pixels */ ; unsigned orientation; /* used to mirror screen image */ ; MATRIX eye_xform; ; ; /* INTERNAL RECORDS */ ; long hsw, hsh; /* half screen width, height */ ; long hsc, vsc; /* screen center (with offset) */ ; long scx, scy; /* full-resolution scaling for horizon */ ; long sx,sy; /* mantissa of screen scaling */ ; int xshift, yshift; /* scaling bit shifts */ ; ; long left_C, left_M; /* spherical clip coefficients */ ; long right_C, right_M; ; long top_C, top_M; ; long bot_C, bot_M; ; ; long fac1,fac2,fac3, ; fac4,fac5,fac6, ; fac7,fac8,fac9; /* conversion coefficients */ ; ; long sfac1,sfac2,sfac3, /* scaled conversion factors */ ; sfac4,sfac5,sfac6; ; } VIEW; VIEW STRUC VP_zoom dd ? VP_left dd ? VP_right dd ? VP_top dd ? VP_bottom dd ? VP_hither dd ? VP_yon dd ? VP_aspect dd ? VP_flags dw ? VP_xoffset dd ? VP_yoffset dd ? VP_orientation dw ? VP_xform00 dd ? ; MATRIX VP_xform01 dd ? VP_xform02 dd ? VP_xform10 dd ? VP_xform11 dd ? VP_xform12 dd ? VP_xform20 dd ? VP_xform21 dd ? VP_xform22 dd ? VP_xform30 dd ? VP_xform31 dd ? VP_xform32 dd ? VP_hsw dd ? VP_hsh dd ? VP_hsc dd ? VP_vsc dd ? VP_scx dd ? VP_scy dd ? VP_sx dd ? VP_sy dd ? VP_xshift dw ? VP_yshift dw ? VP_left_C dd ? VP_left_M dd ? VP_right_C dd ? VP_right_M dd ? VP_top_C dd ? VP_top_M dd ? VP_bot_C dd ? VP_bot_M dd ? VIEW ENDS NOFLIP equ 0 ;/* for orientation flags */ XFLIP equ 1 YFLIP equ 2 WIREFRAME equ 0001h ;/* View flags: */ HIDE_HIGHLIGHTED equ 0002h HIDE_UNHIGHLIGHTED equ 0004h PRESCALE equ 2 ;/* frac bits in XY coords */ PRESCALEZ equ 2 ;struct Screeninfo { ; int xmin, ymin, xmax, ymax, xcent, ycent, colors, pages, bw; ; long aspect; ; char id[80]; ; }; SCREENINFO STRUC S_xmin dw ? S_ymin dw ? S_xmax dw ? S_ymax dw ? S_xcent dw ? S_ycent dw ? S_colors dw ? S_pages dw ? S_bw dw ? S_aspect dd ? S_id db 80 dup (?) SCREENINFO ENDS OUT_OF_VIEW equ 80000000h ; returned by clip_by_volume() if out