mirror of
https://github.com/rigreco/Runge-Kutta-Simulation.git
synced 2024-06-15 18:29:30 +00:00
96 lines
2.5 KiB
C
96 lines
2.5 KiB
C
/* ------------------------------------------------------------------------
|
|
System : Manx Aztec C65 Version 3.2b
|
|
MS-DOS cross-development environment
|
|
Platform : Apple IIe 128K PRODOS 8
|
|
Program : dxline.c
|
|
Description : G2 Library Routine
|
|
Double Hi-Res 140 x 192 x 16 color routine.
|
|
Screen Width Color Pixel Line.
|
|
|
|
Input 70 bytes with aux color indices in low nibble
|
|
and main colors in high nibble. Lo-Res color order.
|
|
|
|
Written by : Bill Buckels
|
|
Date Written : January 2013
|
|
Revision : 1.0 First Release
|
|
Licence : You may use this routine for whatever you wish as long
|
|
as you agree that Bill Buckels has no warranty or
|
|
liability obligations whatsoever from said use.
|
|
------------------------------------------------------------------------ */
|
|
|
|
extern unsigned DHRB[];
|
|
extern unsigned char dhapix[16][7];
|
|
extern unsigned char dhmpix[16][7];
|
|
|
|
|
|
dxdline(y, ptr)
|
|
int y;
|
|
unsigned char *ptr;
|
|
{
|
|
unsigned int target = DHRB[y];
|
|
register int x, z, i=0, j=1, ci, p=-1;
|
|
unsigned char mbuf[40],abuf[40],c;
|
|
|
|
/* set buffers to black */
|
|
setmem(abuf,40,0);
|
|
setmem(mbuf,40,0);
|
|
|
|
/* decode the scanline indices */
|
|
for (x = 0; x < 70; x++) {
|
|
/* unpack the 2 colors */
|
|
/* map the low nibble first */
|
|
c = ptr[x];
|
|
ci = (int )(c & 0xf);
|
|
for(z=0;z<2;z++) {
|
|
p++;
|
|
if (z==1)ci = (int )(c >> 4);
|
|
|
|
if (ci == 0) {
|
|
/* skip black pixels - buffers are initially black */
|
|
if (p == 6) {
|
|
p= -1;
|
|
i+=2;
|
|
j+=2;
|
|
}
|
|
}
|
|
else {
|
|
switch(p) {
|
|
case 0: abuf[i] = dhapix[ci][0]; /* 00001111 4 bits */
|
|
break;
|
|
case 1: abuf[i] = (abuf[i] | dhapix[ci][1]);/* 01110000 3 bits */
|
|
mbuf[i] = dhmpix[ci][1]; /* 00000001 1 bit */
|
|
break;
|
|
case 2: mbuf[i] = (mbuf[i] | dhmpix[ci][2]);/* 00011110 4 bits */
|
|
break;
|
|
case 3: mbuf[i] = (mbuf[i] | dhmpix[ci][3]);/* 01100000 2 bits */
|
|
abuf[j] = dhapix[ci][3]; /* 00000011 2 bits */
|
|
break;
|
|
case 4: abuf[j] = (abuf[j] | dhapix[ci][4]);/* 00111100 4 bits */
|
|
break;
|
|
case 5: abuf[j] = (abuf[j] | dhapix[ci][5]);/* 01000000 1 bit */
|
|
mbuf[j] = dhmpix[ci][5]; /* 00000111 3 bits */;
|
|
break;
|
|
case 6: mbuf[j] = (mbuf[j] | dhmpix[ci][6]);/* 01111000 4 bits */
|
|
p = -1;
|
|
i+=2;
|
|
j+=2;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* display the scanline */
|
|
#asm
|
|
sta $c055 ; AUX MEM
|
|
#endasm
|
|
movmem(abuf,target,40);
|
|
#asm
|
|
sta $c054 ; MAIN MEM
|
|
#endasm
|
|
movmem(mbuf,target,40);
|
|
|
|
}
|
|
|
|
|