85 lines
2.0 KiB
C
85 lines
2.0 KiB
C
/* ------------------------------------------------------------------------
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System : Manx Aztec C65 Version 3.2b
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MS-DOS cross-development environment
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Platform : Apple IIe 128K PRODOS 8
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Program : dhrplot.c
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Description : G2 Library Routine
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Double Hi-Res 140 x 192 x 16 color plot routine
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Written by : Bill Buckels
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Date Written : January 2013
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Revision : 1.0 First Release
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Licence : You may use this routine for whatever you wish as long
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as you agree that Bill Buckels has no warranty or
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liability obligations whatsoever from said use.
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------------------------------------------------------------------------ */
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#include <dhrpixel.h>
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extern struct dhrpixel dhrx;
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extern unsigned DHRB[];
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int dhrplot(x,y,drawcolor)
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int x, y, drawcolor;
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{
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unsigned char *paux, *pmain;
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#asm
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sta $c054 ; MAIN MEM
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#endasm
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/* bi-directional wrap supported for one scanline only
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for vector line drawing */
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if (x < 0) x+= 140;
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if (x > 139) x-=140;
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/* other than that... */
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/* plotting is not supported outside viewing window */
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if (x < 0 || x > 139 || y < 0 || y > 191)return 0;
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/* initialize plotting values */
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dhrcalc(x, drawcolor);
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/* erase old color then slide new color into place */
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switch(dhrx.pattern)
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{
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case 0:
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case 4:
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paux = (unsigned char *) (DHRB[y] + dhrx.xaux);
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#asm
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sta $c055 ; AUX MEM
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#endasm
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*paux = (*paux & dhrx.mska) | dhrx.caux;
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#asm
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sta $c054 ; MAIN MEM
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#endasm
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break;
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case 1:
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case 3:
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case 5:
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paux = (unsigned char *) (DHRB[y] + dhrx.xaux);
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pmain = (unsigned char *) (DHRB[y] + dhrx.xmain);
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#asm
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sta $c055 ; AUX MEM
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#endasm
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*paux = (*paux & dhrx.mska) | dhrx.caux;
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#asm
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sta $c054 ; MAIN MEM
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#endasm
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*pmain = (*pmain & dhrx.mskm) | dhrx.cmain;
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break;
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case 2:
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case 6:
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pmain = (unsigned char *) (DHRB[y] + dhrx.xmain);
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*pmain = (*pmain & dhrx.mskm) | dhrx.cmain;
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}
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return 0;
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} |