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