733 lines
16 KiB
C
733 lines
16 KiB
C
// WL_SCALE.C
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#include "WL_DEF.H"
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#pragma hdrstop
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#define OP_RETF 0xcb
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/*
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=============================================================================
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GLOBALS
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=============================================================================
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*/
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t_compscale far *scaledirectory[MAXSCALEHEIGHT+1];
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long fullscalefarcall[MAXSCALEHEIGHT+1];
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int maxscale,maxscaleshl2;
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byte far *scalermemory;
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byte _seg *endscalermemory;
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long freescalermemory;
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/*
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=============================================================================
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LOCALS
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=============================================================================
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*/
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unsigned BuildCompScale (int height, byte far *code);
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int stepbytwo;
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//===========================================================================
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/*
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==============
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=
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= BadScale
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=
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==============
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*/
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void far BadScale (void)
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{
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Quit ("BadScale called!");
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}
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/*
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==========================
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=
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= SetupScaling
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=
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==========================
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*/
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long SetupScaling (int maxscaleheight)
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{
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int i,x,y;
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byte far *dest;
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unsigned seg,ofs;
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long size;
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maxscaleheight/=2; // one scaler every two pixels
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maxscale = maxscaleheight-1;
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maxscaleshl2 = maxscale<<2;
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dest = scalermemory;
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//
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// build the compiled scalers
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//
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stepbytwo = viewheight/2; // save space by double stepping
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for (i=1;i<=maxscaleheight;i++)
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{
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seg = FP_SEG(dest);
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ofs = (FP_OFF(dest)+15)&~15;
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dest = MK_FP(seg+ofs/16,0);
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scaledirectory[i] = (t_compscale far *)dest;
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size = BuildCompScale (i*2,dest);
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dest += size;
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if ((byte huge *)dest-(byte huge *)scalermemory > MAXSCALERMEMORY)
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Quit ("Compiled scalars exceeded allocated space!");
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if (i>=stepbytwo)
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i+= 2;
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}
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//
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// get far call addresses
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//
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for (i=1;i<=maxscaleheight;i++)
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{
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fullscalefarcall[i] = (long)scaledirectory[i] + scaledirectory[i]->codeofs[0];
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if (i>=stepbytwo)
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{
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scaledirectory[i+1] = scaledirectory[i];
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fullscalefarcall[i+1] = (long)scaledirectory[i] + scaledirectory[i]->codeofs[0];
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scaledirectory[i+2] = scaledirectory[i];
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fullscalefarcall[i+2] = (long)scaledirectory[i] + scaledirectory[i]->codeofs[0];
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i+=2;
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}
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}
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scaledirectory[0] = scaledirectory[1];
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fullscalefarcall[0] = fullscalefarcall[1];
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//
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// check for oversize wall drawing
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//
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for (i=maxscaleheight;i<MAXSCALEHEIGHT;i++)
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fullscalefarcall[i] = (long)BadScale;
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seg = FP_SEG(dest);
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ofs = (FP_OFF(dest)+15)&~15;
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endscalermemory = (void _seg *)(seg+ofs/16);
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size = (byte huge *)dest-(byte huge *)scalermemory;
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freescalermemory = MAXSCALERMEMORY-16-size;
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return size;
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}
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//===========================================================================
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/*
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========================
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=
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= BuildCompScale
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=
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= Builds a compiled scaler object that will scale a 64 tall object to
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= the given height (centered vertically on the screen)
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=
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= height should be even
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=
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= Call with
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= ---------
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= DS:SI Source for scale
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= ES:DI Dest for scale
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=
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= Calling the compiled scaler only destroys AL
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=
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========================
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*/
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unsigned BuildCompScale (int height, byte far *code)
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{
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t_compscale far *work;
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int i;
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long fix,step;
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unsigned src,totalscaled,totalsize;
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int startpix,endpix,toppix;
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work = (t_compscale far *)code;
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step = ((long)height<<16) / 64;
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code = &work->code[0];
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toppix = (viewheight-height)/2;
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fix = 0;
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for (src=0;src<=64;src++)
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{
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startpix = fix>>16;
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fix += step;
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endpix = fix>>16;
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if (endpix>startpix)
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work->width[src] = endpix-startpix;
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else
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work->width[src] = 0;
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//
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// mark the start of the code
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//
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work->codeofs[src] = FP_OFF(code);
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//
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// compile some code if the source pixel generates any screen pixels
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//
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startpix+=toppix;
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endpix+=toppix;
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if (startpix == endpix || endpix < 0 || startpix >= viewheight || src == 64)
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continue;
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//
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// mov al,[si+src]
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//
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*code++ = 0x8a;
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*code++ = 0x44;
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*code++ = src;
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for (;startpix<endpix;startpix++)
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{
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if (startpix >= viewheight)
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break; // off the bottom of the view area
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if (startpix < 0)
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continue; // not into the view area
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//
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// mov [es:di+heightofs],al
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//
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*code++ = 0x26;
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*code++ = 0x88;
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*code++ = 0x85;
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*((unsigned far *)code)++ = startpix*SCREENBWIDE;
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}
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}
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//
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// retf
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//
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*code++ = 0xcb;
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totalsize = FP_OFF(code);
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return totalsize;
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}
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/*
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=======================
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=
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= ScaleLine
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=
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= linescale should have the high word set to the segment of the scaler
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=
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=======================
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*/
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extern int slinex,slinewidth;
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extern unsigned far *linecmds;
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extern long linescale;
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extern unsigned maskword;
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byte mask1,mask2,mask3;
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void near ScaleLine (void)
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{
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asm mov cx,WORD PTR [linescale+2]
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asm mov es,cx // segment of scaler
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asm mov bp,WORD PTR [linecmds]
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asm mov dx,SC_INDEX+1 // to set SC_MAPMASK
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asm mov bx,[slinex]
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asm mov di,bx
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asm shr di,2 // X in bytes
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asm add di,[bufferofs]
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asm and bx,3
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asm shl bx,3
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asm add bx,[slinewidth] // bx = (pixel*8+pixwidth)
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asm mov al,BYTE [mapmasks3-1+bx] // -1 because pixwidth of 1 is first
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asm mov ds,WORD PTR [linecmds+2]
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asm or al,al
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asm jz notthreebyte // scale across three bytes
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asm jmp threebyte
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notthreebyte:
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asm mov al,BYTE PTR ss:[mapmasks2-1+bx] // -1 because pixwidth of 1 is first
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asm or al,al
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asm jnz twobyte // scale across two bytes
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//
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// one byte scaling
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//
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asm mov al,BYTE PTR ss:[mapmasks1-1+bx] // -1 because pixwidth of 1 is first
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asm out dx,al // set map mask register
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scalesingle:
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asm mov bx,[ds:bp] // table location of rtl to patch
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asm or bx,bx
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asm jz linedone // 0 signals end of segment list
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asm mov bx,[es:bx]
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asm mov dl,[es:bx] // save old value
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asm mov BYTE PTR es:[bx],OP_RETF // patch a RETF in
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asm mov si,[ds:bp+4] // table location of entry spot
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asm mov ax,[es:si]
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asm mov WORD PTR ss:[linescale],ax // call here to start scaling
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asm mov si,[ds:bp+2] // corrected top of shape for this segment
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asm add bp,6 // next segment list
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asm mov ax,SCREENSEG
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asm mov es,ax
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asm call ss:[linescale] // scale the segment of pixels
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asm mov es,cx // segment of scaler
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asm mov BYTE PTR es:[bx],dl // unpatch the RETF
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asm jmp scalesingle // do the next segment
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//
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// done
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//
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linedone:
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asm mov ax,ss
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asm mov ds,ax
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return;
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//
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// two byte scaling
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//
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twobyte:
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asm mov ss:[mask2],al
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asm mov al,BYTE PTR ss:[mapmasks1-1+bx] // -1 because pixwidth of 1 is first
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asm mov ss:[mask1],al
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scaledouble:
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asm mov bx,[ds:bp] // table location of rtl to patch
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asm or bx,bx
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asm jz linedone // 0 signals end of segment list
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asm mov bx,[es:bx]
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asm mov cl,[es:bx] // save old value
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asm mov BYTE PTR es:[bx],OP_RETF // patch a RETF in
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asm mov si,[ds:bp+4] // table location of entry spot
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asm mov ax,[es:si]
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asm mov WORD PTR ss:[linescale],ax // call here to start scaling
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asm mov si,[ds:bp+2] // corrected top of shape for this segment
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asm add bp,6 // next segment list
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asm mov ax,SCREENSEG
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asm mov es,ax
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asm mov al,ss:[mask1]
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asm out dx,al // set map mask register
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asm call ss:[linescale] // scale the segment of pixels
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asm inc di
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asm mov al,ss:[mask2]
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asm out dx,al // set map mask register
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asm call ss:[linescale] // scale the segment of pixels
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asm dec di
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asm mov es,WORD PTR ss:[linescale+2] // segment of scaler
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asm mov BYTE PTR es:[bx],cl // unpatch the RETF
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asm jmp scaledouble // do the next segment
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//
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// three byte scaling
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//
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threebyte:
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asm mov ss:[mask3],al
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asm mov al,BYTE PTR ss:[mapmasks2-1+bx] // -1 because pixwidth of 1 is first
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asm mov ss:[mask2],al
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asm mov al,BYTE PTR ss:[mapmasks1-1+bx] // -1 because pixwidth of 1 is first
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asm mov ss:[mask1],al
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scaletriple:
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asm mov bx,[ds:bp] // table location of rtl to patch
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asm or bx,bx
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asm jz linedone // 0 signals end of segment list
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asm mov bx,[es:bx]
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asm mov cl,[es:bx] // save old value
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asm mov BYTE PTR es:[bx],OP_RETF // patch a RETF in
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asm mov si,[ds:bp+4] // table location of entry spot
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asm mov ax,[es:si]
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asm mov WORD PTR ss:[linescale],ax // call here to start scaling
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asm mov si,[ds:bp+2] // corrected top of shape for this segment
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asm add bp,6 // next segment list
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asm mov ax,SCREENSEG
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asm mov es,ax
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asm mov al,ss:[mask1]
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asm out dx,al // set map mask register
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asm call ss:[linescale] // scale the segment of pixels
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asm inc di
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asm mov al,ss:[mask2]
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asm out dx,al // set map mask register
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asm call ss:[linescale] // scale the segment of pixels
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asm inc di
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asm mov al,ss:[mask3]
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asm out dx,al // set map mask register
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asm call ss:[linescale] // scale the segment of pixels
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asm dec di
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asm dec di
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asm mov es,WORD PTR ss:[linescale+2] // segment of scaler
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asm mov BYTE PTR es:[bx],cl // unpatch the RETF
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asm jmp scaletriple // do the next segment
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}
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/*
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=======================
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=
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= ScaleShape
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=
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= Draws a compiled shape at [scale] pixels high
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=
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= each vertical line of the shape has a pointer to segment data:
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= end of segment pixel*2 (0 terminates line) used to patch rtl in scaler
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= top of virtual line with segment in proper place
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= start of segment pixel*2, used to jsl into compiled scaler
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= <repeat>
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=
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= Setup for call
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= --------------
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= GC_MODE read mode 1, write mode 2
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= GC_COLORDONTCARE set to 0, so all reads from video memory return 0xff
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= GC_INDEX pointing at GC_BITMASK
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=
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=======================
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*/
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static long longtemp;
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void ScaleShape (int xcenter, int shapenum, unsigned height)
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{
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t_compshape _seg *shape;
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t_compscale far *comptable;
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unsigned scale,srcx,stopx,tempx;
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int t;
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unsigned far *cmdptr;
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boolean leftvis,rightvis;
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shape = PM_GetSpritePage (shapenum);
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scale = height>>3; // low three bits are fractional
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if (!scale || scale>maxscale)
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return; // too close or far away
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comptable = scaledirectory[scale];
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*(((unsigned *)&linescale)+1)=FP_SEG(comptable); // seg of far call
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*(((unsigned *)&linecmds)+1)=(unsigned)shape; // seg of shape
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//
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// scale to the left (from pixel 31 to shape->leftpix)
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//
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srcx = 32;
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slinex = xcenter;
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stopx = shape->leftpix;
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cmdptr = &shape->dataofs[31-stopx];
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while ( --srcx >=stopx && slinex>0)
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{
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(unsigned)linecmds = *cmdptr--;
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if ( !(slinewidth = comptable->width[srcx]) )
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continue;
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if (slinewidth == 1)
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{
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slinex--;
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if (slinex<viewwidth)
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{
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if (wallheight[slinex] >= height)
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continue; // obscured by closer wall
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ScaleLine ();
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}
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continue;
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}
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//
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// handle multi pixel lines
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//
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if (slinex>viewwidth)
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{
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slinex -= slinewidth;
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slinewidth = viewwidth-slinex;
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if (slinewidth<1)
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continue; // still off the right side
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}
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else
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{
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if (slinewidth>slinex)
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slinewidth = slinex;
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slinex -= slinewidth;
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}
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leftvis = (wallheight[slinex] < height);
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rightvis = (wallheight[slinex+slinewidth-1] < height);
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if (leftvis)
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{
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if (rightvis)
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ScaleLine ();
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else
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{
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while (wallheight[slinex+slinewidth-1] >= height)
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slinewidth--;
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ScaleLine ();
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}
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}
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else
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{
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if (!rightvis)
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continue; // totally obscured
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while (wallheight[slinex] >= height)
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{
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slinex++;
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slinewidth--;
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}
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ScaleLine ();
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break; // the rest of the shape is gone
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}
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}
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//
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// scale to the right
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//
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slinex = xcenter;
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stopx = shape->rightpix;
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if (shape->leftpix<31)
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{
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srcx = 31;
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cmdptr = &shape->dataofs[32-shape->leftpix];
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}
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else
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{
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srcx = shape->leftpix-1;
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cmdptr = &shape->dataofs[0];
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}
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slinewidth = 0;
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while ( ++srcx <= stopx && (slinex+=slinewidth)<viewwidth)
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{
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(unsigned)linecmds = *cmdptr++;
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if ( !(slinewidth = comptable->width[srcx]) )
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continue;
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if (slinewidth == 1)
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{
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if (slinex>=0 && wallheight[slinex] < height)
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{
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ScaleLine ();
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}
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continue;
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}
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//
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// handle multi pixel lines
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//
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if (slinex<0)
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{
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if (slinewidth <= -slinex)
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continue; // still off the left edge
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slinewidth += slinex;
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slinex = 0;
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}
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else
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{
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if (slinex + slinewidth > viewwidth)
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slinewidth = viewwidth-slinex;
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}
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leftvis = (wallheight[slinex] < height);
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rightvis = (wallheight[slinex+slinewidth-1] < height);
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if (leftvis)
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{
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if (rightvis)
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{
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ScaleLine ();
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}
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else
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{
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while (wallheight[slinex+slinewidth-1] >= height)
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slinewidth--;
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ScaleLine ();
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break; // the rest of the shape is gone
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}
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}
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else
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{
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if (rightvis)
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{
|
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while (wallheight[slinex] >= height)
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{
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slinex++;
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slinewidth--;
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}
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ScaleLine ();
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}
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else
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continue; // totally obscured
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}
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}
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}
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/*
|
|
=======================
|
|
=
|
|
= SimpleScaleShape
|
|
=
|
|
= NO CLIPPING, height in pixels
|
|
=
|
|
= Draws a compiled shape at [scale] pixels high
|
|
=
|
|
= each vertical line of the shape has a pointer to segment data:
|
|
= end of segment pixel*2 (0 terminates line) used to patch rtl in scaler
|
|
= top of virtual line with segment in proper place
|
|
= start of segment pixel*2, used to jsl into compiled scaler
|
|
= <repeat>
|
|
=
|
|
= Setup for call
|
|
= --------------
|
|
= GC_MODE read mode 1, write mode 2
|
|
= GC_COLORDONTCARE set to 0, so all reads from video memory return 0xff
|
|
= GC_INDEX pointing at GC_BITMASK
|
|
=
|
|
=======================
|
|
*/
|
|
|
|
void SimpleScaleShape (int xcenter, int shapenum, unsigned height)
|
|
{
|
|
t_compshape _seg *shape;
|
|
t_compscale far *comptable;
|
|
unsigned scale,srcx,stopx,tempx;
|
|
int t;
|
|
unsigned far *cmdptr;
|
|
boolean leftvis,rightvis;
|
|
|
|
|
|
shape = PM_GetSpritePage (shapenum);
|
|
|
|
scale = height>>1;
|
|
comptable = scaledirectory[scale];
|
|
|
|
*(((unsigned *)&linescale)+1)=FP_SEG(comptable); // seg of far call
|
|
*(((unsigned *)&linecmds)+1)=(unsigned)shape; // seg of shape
|
|
|
|
//
|
|
// scale to the left (from pixel 31 to shape->leftpix)
|
|
//
|
|
srcx = 32;
|
|
slinex = xcenter;
|
|
stopx = shape->leftpix;
|
|
cmdptr = &shape->dataofs[31-stopx];
|
|
|
|
while ( --srcx >=stopx )
|
|
{
|
|
(unsigned)linecmds = *cmdptr--;
|
|
if ( !(slinewidth = comptable->width[srcx]) )
|
|
continue;
|
|
|
|
slinex -= slinewidth;
|
|
ScaleLine ();
|
|
}
|
|
|
|
|
|
//
|
|
// scale to the right
|
|
//
|
|
slinex = xcenter;
|
|
stopx = shape->rightpix;
|
|
if (shape->leftpix<31)
|
|
{
|
|
srcx = 31;
|
|
cmdptr = &shape->dataofs[32-shape->leftpix];
|
|
}
|
|
else
|
|
{
|
|
srcx = shape->leftpix-1;
|
|
cmdptr = &shape->dataofs[0];
|
|
}
|
|
slinewidth = 0;
|
|
|
|
while ( ++srcx <= stopx )
|
|
{
|
|
(unsigned)linecmds = *cmdptr++;
|
|
if ( !(slinewidth = comptable->width[srcx]) )
|
|
continue;
|
|
|
|
ScaleLine ();
|
|
slinex+=slinewidth;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
//
|
|
// bit mask tables for drawing scaled strips up to eight pixels wide
|
|
//
|
|
// down here so the STUPID inline assembler doesn't get confused!
|
|
//
|
|
|
|
|
|
byte mapmasks1[4][8] = {
|
|
{1 ,3 ,7 ,15,15,15,15,15},
|
|
{2 ,6 ,14,14,14,14,14,14},
|
|
{4 ,12,12,12,12,12,12,12},
|
|
{8 ,8 ,8 ,8 ,8 ,8 ,8 ,8} };
|
|
|
|
byte mapmasks2[4][8] = {
|
|
{0 ,0 ,0 ,0 ,1 ,3 ,7 ,15},
|
|
{0 ,0 ,0 ,1 ,3 ,7 ,15,15},
|
|
{0 ,0 ,1 ,3 ,7 ,15,15,15},
|
|
{0 ,1 ,3 ,7 ,15,15,15,15} };
|
|
|
|
byte mapmasks3[4][8] = {
|
|
{0 ,0 ,0 ,0 ,0 ,0 ,0 ,0},
|
|
{0 ,0 ,0 ,0 ,0 ,0 ,0 ,1},
|
|
{0 ,0 ,0 ,0 ,0 ,0 ,1 ,3},
|
|
{0 ,0 ,0 ,0 ,0 ,1 ,3 ,7} };
|
|
|
|
|
|
unsigned wordmasks[8][8] = {
|
|
{0x0080,0x00c0,0x00e0,0x00f0,0x00f8,0x00fc,0x00fe,0x00ff},
|
|
{0x0040,0x0060,0x0070,0x0078,0x007c,0x007e,0x007f,0x807f},
|
|
{0x0020,0x0030,0x0038,0x003c,0x003e,0x003f,0x803f,0xc03f},
|
|
{0x0010,0x0018,0x001c,0x001e,0x001f,0x801f,0xc01f,0xe01f},
|
|
{0x0008,0x000c,0x000e,0x000f,0x800f,0xc00f,0xe00f,0xf00f},
|
|
{0x0004,0x0006,0x0007,0x8007,0xc007,0xe007,0xf007,0xf807},
|
|
{0x0002,0x0003,0x8003,0xc003,0xe003,0xf003,0xf803,0xfc03},
|
|
{0x0001,0x8001,0xc001,0xe001,0xf001,0xf801,0xfc01,0xfe01} };
|
|
|
|
int slinex,slinewidth;
|
|
unsigned far *linecmds;
|
|
long linescale;
|
|
unsigned maskword;
|
|
|