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winamp/Src/Winamp/plush/PF_TRANS.C

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/******************************************************************************
Plush Version 1.2
pf_trans.c
Solid Translucent Rasterizers
Copyright (c) 1996-2000, Justin Frankel
******************************************************************************/
#include "plush.h"
#include "putface.h"
void plPF_TransF(pl_Cam *cam, pl_Face *TriFace) {
pl_uChar i0, i1, i2;
pl_uChar *gmem = cam->frameBuffer;
pl_uChar *remap = TriFace->Material->_ReMapTable;
pl_ZBuffer *zbuf = cam->zBuffer;
pl_sInt32 X1, X2, dX1=0, dX2=0, XL1, XL2;
pl_ZBuffer Z1, ZL, dZ1=0, dZL=0, dZ2=0, Z2;
pl_sInt32 Y1, Y2, Y0, dY;
pl_uInt16 *lookuptable = TriFace->Material->_AddTable;
pl_uChar stat;
pl_sInt32 bc = (pl_sInt32) TriFace->fShade*TriFace->Material->_tsfact;
pl_Bool zb = (zbuf&&TriFace->Material->zBufferable) ? 1 : 0;
PUTFACE_SORT();
if (bc < 0) bc=0;
if (bc > (pl_sInt32) TriFace->Material->_tsfact-1) bc=TriFace->Material->_tsfact-1;
remap+=bc;
X2 = X1 = TriFace->Scrx[i0];
Z2 = Z1 = TriFace->Scrz[i0];
Y0 = (TriFace->Scry[i0]+(1<<19))>>20;
Y1 = (TriFace->Scry[i1]+(1<<19))>>20;
Y2 = (TriFace->Scry[i2]+(1<<19))>>20;
dY = Y2 - Y0;
if (dY) {
dX2 = (TriFace->Scrx[i2] - X1) / dY;
dZ2 = (TriFace->Scrz[i2] - Z1) / dY;
}
dY = Y1-Y0;
if (dY) {
dX1 = (TriFace->Scrx[i1] - X1) / dY;
dZ1 = (TriFace->Scrz[i1] - Z1) / dY;
if (dX2 < dX1) {
dX2 ^= dX1; dX1 ^= dX2; dX2 ^= dX1;
dZL = dZ1; dZ1 = dZ2; dZ2 = dZL;
stat = 2;
} else stat = 1;
} else {
if (TriFace->Scrx[i1] > X1) {
X2 = TriFace->Scrx[i1];
Z2 = TriFace->Scrz[i1];
stat= 2|4;
} else {
X1 = TriFace->Scrx[i1];
Z1 = TriFace->Scrz[i1];
stat= 1|8;
}
}
gmem += (Y0 * cam->ScreenWidth);
zbuf += (Y0 * cam->ScreenWidth);
if (zb) {
XL1 = (((dX1-dX2)*dY+(1<<19))>>20);
if (XL1) dZL = ((dZ1-dZ2)*dY)/XL1;
else {
XL1 = ((X2-X1+(1<<19))>>20);
if (XL1) dZL = (Z2-Z1)/XL1;
}
}
while (Y0 < Y2) {
if (Y0 == Y1) {
dY = Y2 - ((TriFace->Scry[i1]+(1<<19))>>20);
if (dY) {
if (stat & 1) {
X1 = TriFace->Scrx[i1];
dX1 = (TriFace->Scrx[i2]-TriFace->Scrx[i1])/dY;
}
if (stat & 2) {
X2 = TriFace->Scrx[i1];
dX2 = (TriFace->Scrx[i2]-TriFace->Scrx[i1])/dY;
}
if (stat & 4) {
X1 = TriFace->Scrx[i0];
dX1 = (TriFace->Scrx[i2]-TriFace->Scrx[i0])/dY;
}
if (stat & 8) {
X2 = TriFace->Scrx[i0];
dX2 = (TriFace->Scrx[i2]-TriFace->Scrx[i0])/dY;
}
dZ1 = (TriFace->Scrz[i2]- Z1)/dY;
}
}
XL1 = (X1+(1<<19))>>20;
XL2 = (X2+(1<<19))>>20;
ZL = Z1;
if ((XL2-XL1) > 0) {
XL2 -= XL1;
zbuf += XL1;
gmem += XL1;
XL1 += XL2;
if (zb) do {
if (*zbuf < ZL) {
*zbuf = ZL;
*gmem = remap[lookuptable[*gmem]];
}
gmem++;
zbuf++;
ZL += dZL;
} while (--XL2);
else do *gmem++ = remap[lookuptable[*gmem]]; while (--XL2);
gmem -= XL1;
zbuf -= XL1;
}
gmem += cam->ScreenWidth;
zbuf += cam->ScreenWidth;
Z1 += dZ1;
X1 += dX1;
X2 += dX2;
Y0 ++;
}
}
void plPF_TransG(pl_Cam *cam, pl_Face *TriFace) {
pl_uChar i0, i1, i2;
pl_uChar *gmem = cam->frameBuffer;
pl_uChar *remap = TriFace->Material->_ReMapTable;
pl_ZBuffer *zbuf = cam->zBuffer;
pl_sInt32 X1, X2, dX1=0, dX2=0, XL1, XL2;
pl_ZBuffer Z1, ZL, dZ1=0, dZL=0, dZ2=0, Z2;
pl_sInt32 dC1=0, dCL=0, CL, C1, C2, dC2=0;
pl_sInt32 Y1, Y2, Y0, dY;
pl_Float nc = (TriFace->Material->_tsfact*65536.0f);
pl_uInt16 *lookuptable = TriFace->Material->_AddTable;
pl_Bool zb = (zbuf&&TriFace->Material->zBufferable) ? 1 : 0;
pl_uChar stat;
pl_sInt32 maxColor=((TriFace->Material->_tsfact-1)<<16);
pl_sInt32 maxColorNonShift=TriFace->Material->_tsfact-1;
PUTFACE_SORT();
C1 = C2 = (pl_sInt32) (TriFace->Shades[i0]*nc);
X2 = X1 = TriFace->Scrx[i0];
Z2 = Z1 = TriFace->Scrz[i0];
Y0 = (TriFace->Scry[i0]+(1<<19))>>20;
Y1 = (TriFace->Scry[i1]+(1<<19))>>20;
Y2 = (TriFace->Scry[i2]+(1<<19))>>20;
dY = Y2 - Y0;
if (dY) {
dX2 = (TriFace->Scrx[i2] - X1) / dY;
dC2 = (pl_sInt32) ((TriFace->Shades[i2]*nc - C1) / dY);
dZ2 = (TriFace->Scrz[i2] - Z1) / dY;
}
dY = Y1-Y0;
if (dY) {
dX1 = (TriFace->Scrx[i1] - X1) / dY;
dZ1 = (TriFace->Scrz[i1] - Z1) / dY;
dC1 = (pl_sInt32) ((TriFace->Shades[i1]*nc - C1) / dY);
if (dX2 < dX1) {
dX2 ^= dX1; dX1 ^= dX2; dX2 ^= dX1;
dC2 ^= dC1; dC1 ^= dC2; dC2 ^= dC1;
dZL = dZ1; dZ1 = dZ2; dZ2 = dZL;
stat = 2;
} else stat = 1;
} else {
if (TriFace->Scrx[i1] > X1) {
X2 = TriFace->Scrx[i1];
Z2 = TriFace->Scrz[i1];
C2 = (pl_sInt32) (TriFace->Shades[i1]*nc);
stat = 2|4;
} else {
X1 = TriFace->Scrx[i1];
Z1 = TriFace->Scrz[i1];
C1 = (pl_sInt32) (TriFace->Shades[i1]*nc);
stat = 1|8;
}
}
gmem += (Y0 * cam->ScreenWidth);
zbuf += (Y0 * cam->ScreenWidth);
XL1 = (((dX1-dX2)*dY+(1<<19))>>20);
if (XL1) {
dCL = ((dC1-dC2)*dY)/XL1;
dZL = ((dZ1-dZ2)*dY)/XL1;
} else {
XL1 = ((X2-X1+(1<<19))>>20);
if (XL1) {
dCL = (C2-C1)/XL1;
dZL = (Z2-Z1)/XL1;
}
}
while (Y0 < Y2) {
if (Y0 == Y1) {
dY = Y2 - ((TriFace->Scry[i1]+(1<<19))>>20);
if (dY) {
if (stat & 1) {
X1 = TriFace->Scrx[i1];
dX1 = (TriFace->Scrx[i2]-TriFace->Scrx[i1])/dY;
}
if (stat & 2) {
X2 = TriFace->Scrx[i1];
dX2 = (TriFace->Scrx[i2]-TriFace->Scrx[i1])/dY;
}
if (stat & 4) {
X1 = TriFace->Scrx[i0];
dX1 = (TriFace->Scrx[i2]-TriFace->Scrx[i0])/dY;
}
if (stat & 8) {
X2 = TriFace->Scrx[i0];
dX2 = (TriFace->Scrx[i2]-TriFace->Scrx[i0])/dY;
}
dZ1 = (TriFace->Scrz[i2]-Z1)/dY;
dC1 = (pl_sInt32) ((TriFace->Shades[i2]*nc - C1) / dY);
}
}
CL = C1;
XL1 = (X1+(1<<19))>>20;
XL2 = (X2+(1<<19))>>20;
ZL = Z1;
if ((XL2-XL1) > 0) {
XL2 -= XL1;
zbuf += XL1;
gmem += XL1;
XL1 += XL2;
if (zb) do {
if (*zbuf < ZL) {
int av;
if (CL >= maxColor) av=maxColorNonShift;
else if (CL > 0) av=CL>>16;
else av=0;
*zbuf = ZL;
*gmem = remap[av + lookuptable[*gmem]];
}
gmem++;
CL += dCL;
zbuf++;
ZL += dZL;
} while (--XL2);
else do {
int av;
if (CL >= maxColor) av=maxColorNonShift;
else if (CL > 0) av=CL>>16;
else av=0;
*gmem++ = remap[av + lookuptable[*gmem]];
CL += dCL;
} while (--XL2);
gmem -= XL1;
zbuf -= XL1;
}
gmem += cam->ScreenWidth;
zbuf += cam->ScreenWidth;
Z1 += dZ1;
X1 += dX1;
X2 += dX2;
C1 += dC1;
Y0++;
}
}
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