276 lines
10 KiB
C
276 lines
10 KiB
C
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// RV_Walls.c
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#include <math.h>
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#include <string.h>
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#include "D_global.h"
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#include "R_refdef.h"
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#include "d_disk.h"
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int angleadjust[4]=
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{
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0, TANANGLES, 0, TANANGLES
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};
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fixed_t tangents[TANANGLES *2];
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fixed_t sines[TANANGLES *5];
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fixed_t *cosines; // point 1/4 phase into sines
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int pixelangle[MAX_VIEW_WIDTH+1];
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fixed_t pixelcosine[MAX_VIEW_WIDTH+1];
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//
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// the wall_??[x] arrays are used to determine where a mouse click is
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//
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int wallnumber[MAX_VIEW_WIDTH]; // tilex<<17 + tiley<<2 + side, -1 = no wall
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int walltopy[MAX_VIEW_WIDTH];
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int walltexture[MAX_VIEW_WIDTH]; // 0-63
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fixed_t wallz[MAX_VIEW_WIDTH]; // pointx
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/* */
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/*================== */
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/*= */
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/*= InitWalls */
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/*= */
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/*= Builds tangent tables for -90 degrees to +90 degrees */
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/*= and pixel angle table */
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/*= */
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/*================== */
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/* */
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void InitWalls(void)
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{
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int i;
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int intval;
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double tang, value, ivalue;
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//
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// tangent values for wall tracing
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//
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for (i=0; i<TANANGLES/2; i++) {
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tang=(i+0.5)*PI/(TANANGLES *2);
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value=tan(tang);
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ivalue=1/value;
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value=rint(value *FRACUNIT);
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ivalue=rint(ivalue *FRACUNIT);
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tangents[TANANGLES+i]=-value;
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tangents[TANANGLES+TANANGLES-1 -i]=-ivalue;
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tangents[i]=ivalue;
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tangents[TANANGLES-1 -i]=value;
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}
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//
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// high precision sin / cos for distance calculations
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//
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for (i=0; i<TANANGLES; i++) {
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tang=(i+0.5)*PI/(TANANGLES *2);
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value=sin(tang);
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intval=rint(value *FRACUNIT);
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sines[i]=intval;
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sines[TANANGLES *4+i]=intval;
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sines[TANANGLES *2 -1 -i]=intval;
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sines[TANANGLES *2+i]=-intval;
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sines[TANANGLES *4 -1 -i]=-intval;
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}
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cosines=&sines[TANANGLES];
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//
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// calculate the angle deltas for each view post
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// VIEWWIDTH view posts covers TANANGLES angles
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// traces go through the RIGHT EDGE of the pixel to follow the direc
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//
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for (i=0;i<windowWidth+1; i++) {
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intval=rint(atan((double)(CENTERX-(i+1))/CENTERX)/PI *TANANGLES *2);
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pixelangle[i]=intval;
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pixelcosine[i]=cosines[intval&(TANANGLES *4-1)];
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}
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}
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//============================================================
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/* */
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/*================== */
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/*= */
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/*= ClearWalls */
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/*= */
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/*= Clears the wallz array, so posts that fade out into the distance won*/
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/*= block sprites */
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/*= */
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/*=================== */
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/* */
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void ClearWalls(void)
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{
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int i;
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for (i=0; i<windowWidth; i++)
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wallz[i]=MAXZ+1;
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}
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//============================================================
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/* */
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/*==================== */
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/*= */
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/*= DrawWall */
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/*= */
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/*= Draws the wall on side from p1->px to p2->px-1 with wall picture wal*/
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/*= p1/p2 are projected and Z clipped, but unclipped to the view window */
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/*= */
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/*==================== */
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/* */
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void DrawWall(void)
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{
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int baseangle, wallnum;
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byte **postindex; // start of the 64 entry texture table for t
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fixed_t distance; // horizontal / vertical dist to wall segmen
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fixed_t pointz; // transformed distance to wall post
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fixed_t anglecos;
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fixed_t textureadjust; // the amount the texture p1ane is shifted
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fixed_t ceilingheight; // top of the wall
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fixed_t floorheight; // bottom of the wall
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fixed_t top, bottom; // precise y coordinates for post
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int topy, bottomy; // pixel y coordinates for post
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fixed_t fracadjust; // the amount to prestep for the top pixel
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int angle; // the ray angle that strikes the current po
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int texture; // 0-63 post number
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int x, x1, x2; // collumn and ranges
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int p1mapspot, p2mapspot;
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short *wall;
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x1=p1->px<xclipl?xclipl : p1->px;
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x2=p2->px-1>xcliph?xcliph : p2->px-1;
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if (x1>x2)
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return; // totally clipped off side
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//
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// set up for loop
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//
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#ifdef VALIDATE
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if (walltype>=numwalls)
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MS_Error("DrawWall: Invalid source walltype");
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#endif
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walltype=walltranslation[walltype]; // global animation
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#ifdef VALIDATE
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if (walltype>=numwalls)
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MS_Error("DrawWall: Invalid translated walltype");
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#endif
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wall=lumpmain[walllump+walltype]; // to get wall height
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postindex=wallposts+((walltype-1)<<6); // 64 pointers to texture st
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baseangle=viewfineangle;
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wallnum=(tilex<<17)+(tiley<<2)+side; // so a mouse click can be l
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switch (side) {
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case 0: // south facing wall
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distance=viewy-(tiley<<(FRACBITS+TILESHIFT));
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textureadjust=viewx;
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baseangle+=TANANGLES *2;
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floorheight=northbottom[mapspot];
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break;
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case 1: // west facing wall
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distance=((tilex+1)<<(FRACBITS+TILESHIFT))-viewx;
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textureadjust=viewy;
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baseangle+=TANANGLES;
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floorheight=westbottom[mapspot+1];
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break;
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case 2: // north facing wall
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distance=((tiley+1)<<(FRACBITS+TILESHIFT))-viewy;
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textureadjust=-viewx;
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baseangle+=TANANGLES *2;
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floorheight=northbottom[mapspot+MAPSIZE];
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break;
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case 3: // east facing wall
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distance=viewx-(tilex<<(FRACBITS+TILESHIFT));
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textureadjust=-viewy;
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baseangle+=TANANGLES;
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floorheight=westbottom[mapspot];
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break;
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}
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//
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// the floor and ceiling height is the max of the points
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//
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ceilingheight = floorheight + *wall *4; // based on height of wall pic
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//ceilingheight = floorheight + (*wall)*4 *4;
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ceilingheight=(ceilingheight<<FRACBITS)-viewz;
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floorheight=-((floorheight<<FRACBITS)-viewz); // distance below vi
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//
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// step through the individual posts
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//
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for (x=x1; x<=x2; x++) {
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angle=baseangle+pixelangle[x];
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angle&=TANANGLES *2-1;
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//
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// calculate the texture post along the wall that was hit
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//
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texture=(textureadjust+FIXEDMUL(distance, tangents[angle]))>>FRACBITS;
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texture&=63;
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if (x==x1 && texture==63)
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texture = 0; // this is a hack to ensure two tile wide
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else if (x==x2 && !texture)
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texture = 63; // pics don't wrap inside their wall segments
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sp_source=postindex[texture];
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//
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// the z distance of the post hit = walldistance*cos(screenangle
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//
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anglecos=cosines[(angle-TANANGLES)&(TANANGLES *4-1)];
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pointz=FIXEDDIV(distance, anglecos);
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pointz=FIXEDMUL(pointz, pixelcosine[x]);
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if (pointz>MAXZ)
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continue;
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// test to adjust shadowing
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//sp_colormap=zcolormap[pointz>>FRACBITS];
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if (pointz > MAXZ)
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continue;
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sp_colormap=zcolormap[(pointz>>FRACBITS)];
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//if (*wall > 45)
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//sp_colormap=zcolormap[0];
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//
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// calculate the size and scale of the post
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// the scale is calculated a little smaller than true to guarant
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// any adjacent floors / ceilings
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//
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sp_fracstep=FIXEDMUL(pointz, ISCALEFUDGE);
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top=FIXEDDIV(ceilingheight, sp_fracstep);
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topy=top>>FRACBITS;
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fracadjust=top&(FRACUNIT-1);
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sp_frac=FIXEDMUL(fracadjust, sp_fracstep);
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topy=CENTERY-topy;
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walltopy[x]=topy;
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if (topy<0) {
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sp_frac-=topy *sp_fracstep;
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topy=0;
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}
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bottom=FIXEDDIV(floorheight, sp_fracstep)+FRACUNIT;
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bottomy=bottom>=(CENTERY<<FRACBITS)?windowHeight-1:CENTERY+(bottom>>FRACBITS);
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if ((bottomy<0)||(topy>=windowHeight))
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continue;
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sp_count=bottomy-topy+1;
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sp_dest=viewylookup[bottomy]+x;
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ScalePost();
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wallz[x]=pointz;
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wallnumber[x]=wallnum;
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walltexture[x]=texture;
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}
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}
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