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/* linetemp.h - line drawing template (see graphics.c)
#define's
THREED - use z-values, otherwise z=0
OPCODE - the opcode for the given line
FLAT_INDEX - line is flat shaded (single color), 8bpp
INTERP_INDEX - line is gouraud shaded (multi color), 8bpp
FLAT_COLOR - line is flat shaded (single color), 24bpp
INTERP_COLOR - line is gouraud shaded (multi color) ,24bpp
*/
{
int adx, ady;
int dx,dy;
uint reg1;
uint reg2;
uint reg3;
uint reg4;
uint mlen;
#ifdef THREED
uint reg5, reg6;
z1=FN(z1);
z2=FN(z2);
#endif
y2+=yoffs;
y1+=yoffs;
dx = x2-x1;
dy = y2-y1;
adx=abs(dx); /* TODO - opt */
ady=abs(dy); /* TODO - opt */
reg3=(dx & 0x80000000) | ((dy & 0x80000000) >> 1) | (x1 << 12);
if (adx > ady) {
reg1=(adx>>8)<<24 | y1 << 12;
if (!dx) { /* TODO - this case never happens! */
reg2=adx<<24 | ((dy<<12)&0x00ffffff);
mlen=1;
}
else {
reg2=adx<<24 | (((dy<<12)/adx)&0x00ffffff);
mlen=adx;
}
if(adx!=dx)
reg4=0x00fff000;
else
reg4=0x00001000;
} else {
reg1=(ady>>8)<<24 | y1 << 12;
if(ady!=dy)
reg2=ady<<24 | 0x00fff000;
else
reg2=ady<<24 | 0x00001000;
if (!dy) {
reg4=dx<<12;
mlen=1;
}
else {
reg4=(dx<<12)/ady;
mlen=ady;
}
}
#ifdef THREED
reg5=z1<<12;
reg6=(z2-z1)<<12;
#endif
/* setup for first of possible several draws */
#ifdef FLAT_INDEX
*listPtr++=load_short_ro(BANK_MASK_REG,BLUE_BANK);
#endif
#ifdef INTERP_INDEX
*listPtr++=load_short_ro(BANK_MASK_REG,BLUE_BANK);
#endif
#ifdef FLAT_COLOR
*listPtr++=load_short_ro(BANK_MASK_REG,RED_BANK);
#endif
#ifdef INTERP_COLOR
*listPtr++=load_short_ro(BANK_MASK_REG,RED_BANK);
#endif
/* draw first line */
*listPtr++ = OPCODE; /* instruction */
*listPtr++ = reg1; /* y-start, y-count */
*listPtr++ = reg2; /* y-delta, y-count */
*listPtr++ = reg3; /* x-start */
*listPtr++ = reg4; /* x-delta */
/* do vars for tail end of 1st line (dz, di, etc) and following lines */
#ifdef THREED
*listPtr++ = reg5; /* z-start */
*listPtr++ = reg6; /* z-delta */
#else
*listPtr++ = 0; /* z-start */
*listPtr++ = 0; /* z-delta */
#endif
#ifdef FLAT_INDEX
*listPtr++ = cindex << 12; /* i-start */
*listPtr++ = 0; /* i-delta */
#endif
#ifdef INTERP_INDEX
*listPtr++ = i1 << 12; /* i-start */
*listPtr++ = ((i2-i1+1) << 12)/mlen & 0x000fffff; /* i-delta */
#endif
#ifdef FLAT_COLOR
*listPtr++ = r << 12; /* i-start */
*listPtr++ = 0; /* i-delta */
*listPtr++ = load_short_ro(BANK_MASK_REG, GREEN_BANK);/* bank select */
*listPtr++ = load_long_ro(IMAIN_REG,1); /* load i-start */
*listPtr++ = g << 12; /* i-start (r7) */
*listPtr++ = OPCODE & ~0x7f; /* strip loads */
*listPtr++ = load_short_ro(BANK_MASK_REG, BLUE_BANK); /* bank select */
*listPtr++ = load_long_ro(IMAIN_REG,1); /* load i-start */
*listPtr++ = b << 12; /* i-start (r7) */
*listPtr++ = OPCODE & ~0x7f; /* strip loads */
#endif
#ifdef INTERP_COLOR
*listPtr++ = r1 << 12; /* i-start (r7) */
*listPtr++ = ((r2-r1+1) << 12)/mlen; /* i-delta (r8) */
*listPtr++ = load_short_ro(BANK_MASK_REG, GREEN_BANK);/* bank select */
*listPtr++ = load_long_ro(IMAIN_REG,2); /* load i's */
*listPtr++ = g1 << 12; /* i-start (r7) */
*listPtr++ = ((g2-g1+1) << 12)/mlen; /* i-delta (r8) */
*listPtr++ = OPCODE & ~0x7f; /* strip loads */
*listPtr++ = load_short_ro(BANK_MASK_REG, BLUE_BANK); /* bank select */
*listPtr++ = load_long_ro(IMAIN_REG,2); /* load i's */
*listPtr++ = b1 << 12; /* i-start (r7) */
*listPtr++ = ((b2-b1+1) << 12)/mlen; /* i-delta (r8) */
*listPtr++ = OPCODE & ~0x7f; /* strip loads */
#endif
CHKEXEC; /* execute */
}
#undef FLAT_INDEX
#undef INTERP_INDEX
#undef FLAT_COLOR
#undef INTERP_COLOR
#undef THREED
#undef OPCODE
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.