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rend.c
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rend.c
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/* :ts=8 bk=0
*
* rend.c: Rendering stuff.
*
* Leo L. Schwab 9305.18
*/
#include <types.h>
#include <mem.h>
#include <operamath.h>
#include <graphics.h>
#include "castle.h"
#include "imgfile.h"
#include "loaf.h"
#include "anim.h"
#include "app_proto.h"
/***************************************************************************
* Globals.
*/
extern RastPort *rprend, *rpvis;
extern Item vblIO;
extern Vertex xfverts[], projverts[];
extern int16 grididxs[];
extern VisOb visobs[];
extern int32 nviso;
extern uint32 vertsused[];
extern int32 nvisv;
extern Vertex obverts[], xfobverts[], *curobv;
extern int32 nobverts;
extern Matrix camera;
extern Vertex playerpos, campos;
extern Vertex xformsquare[];
extern Vector plusx, plusz, minusx, minusz;
extern ImageEntry *wallimgs;
extern CCB *wallcel, *statpanel, *guncel;
extern int32 wide, high, cy;
extern uint32 ccbextra;
extern int32 floorcolor, ceilingcolor;
extern JoyData jd;
AnimLoaf *wallanims;
int32 nwallanims;
int16 *scaledpluts, *curscaledplut;
CCB ccbpool[MAXVISOBS];
CCB *curccb;
CCB *backwallcel;
uint32 linebuf[10];
/***************************************************************************
* Code.
*/
void
rendercels ()
{
resetlinebuf (linebuf);
curccb = ccbpool;
curscaledplut = scaledpluts;
buildcellist (visobs, nviso, projverts, xfverts, TRUE);
if (curccb > ccbpool) {
backwallcel->ccb_NextPtr = curccb - 1;
ccbpool->ccb_NextPtr = guncel;
} else
backwallcel->ccb_NextPtr = guncel;
DrawCels (rprend->rp_BitmapItem, backwallcel);
sequencegun (0);
}
void
buildcellist (vo, nvo, verts, xfverts, indirect)
register struct VisOb *vo;
register int nvo;
register struct Vertex *verts;
struct Vertex *xfverts;
int indirect;
{
#define ZFADENEAR_F16 (8 * ONE_F16)
#define ZFADEFAR_F16 (GRIDCUTOFF * ONE_F16)
register CCB *ccb;
register int32 lidx, ridx;
Vertex *vptrs[4];
Point corner[4];
int zflags;
for ( ; --nvo >= 0; vo++) {
if (islinefull (linebuf))
break;
lidx = vo->vo_LIdx;
ridx = vo->vo_RIdx;
if (lidx < 0) {
renderobs (vo);
continue;
}
if (indirect) {
lidx = grididxs[lidx];
ridx = grididxs[ridx];
}
lidx <<= 1;
ridx <<= 1;
zflags = 0;
if (verts[lidx].Z < (ZCLIP >> 8)) zflags |= 0x3;
if (verts[ridx].Z < (ZCLIP >> 8)) zflags |= 0xC;
if (zflags == 0xF)
continue;
if (!zflags)
if (vo->vo_MEFlags & MEF_OPAQUE) {
if (!testmarklinebuf (linebuf,
verts[lidx].X,
verts[ridx].X))
continue;
} else {
if (!testlinebuf (linebuf,
verts[lidx].X,
verts[ridx].X))
continue;
}
if (verts[lidx].Z > (ZFADEFAR_F16 >> 8))
/*
* Too far away, don't render.
*/
continue;
corner[0].pt_X = verts[lidx].X;
corner[0].pt_Y = verts[lidx].Y;
corner[1].pt_X = verts[lidx + 1].X;
corner[1].pt_Y = verts[lidx + 1].Y;
corner[2].pt_X = verts[ridx + 1].X;
corner[2].pt_Y = verts[ridx + 1].Y;
corner[3].pt_X = verts[ridx].X;
corner[3].pt_Y = verts[ridx].Y;
ccb = curccb;
img2ccb (&wallimgs[vo->vo_ImgIdx], ccb);
if (verts[lidx].Z > (ZFADENEAR_F16 >> 8)) {
frac16 value;
value = DivSF16 (ZFADEFAR_F16 - (verts[lidx].Z << 8),
ZFADEFAR_F16 - ZFADENEAR_F16);
fadecel (ccb, value);
}
if (zflags) {
register frac16 factor;
mkVertPtrs
(xfverts, vptrs, lidx, lidx + 1, ridx + 1, ridx);
factor = zclip (vptrs, zflags, corner);
if (vo->vo_MEFlags & MEF_OPAQUE) {
if (!testmarklinebuf (linebuf,
corner[0].pt_X,
corner[3].pt_X))
{
/*
* Oops, it's invisible after all.
*/
continue;
}
} else {
if (!testlinebuf (linebuf,
corner[0].pt_X,
corner[3].pt_X))
continue;
}
zClipCCB (ccb, factor);
}
FasterMapCel (ccb, corner);
if (vo->vo_ME)
vo->vo_ME->me_VisFlags |= vo->vo_VisFlags << 4;
ccb->ccb_Flags &= ~CCB_LAST;
curccb++;
}
}
void
img2ccb (ie, ccb)
register struct ImageEntry *ie;
register struct CCB *ccb;
{
register struct ShortCCB *sccb;
sccb = ie->ie_SCCB;
ccb->ccb_Flags = sccb->sccb_Flags;
ccb->ccb_PRE0 = sccb->sccb_PRE0;
ccb->ccb_PRE1 = sccb->sccb_PRE1;
ccb->ccb_Width = sccb->sccb_Width;
ccb->ccb_Height = sccb->sccb_Height;
ccb->ccb_SourcePtr = sccb->sccb_PDAT;
ccb->ccb_PLUTPtr = ie->ie_PLUT;
ccb->ccb_PIXC = ie->ie_PPMPC;
}
void
cyclewalls (nvbls)
int32 nvbls;
{
cycleanimloafs (wallanims, nwallanims, nvbls);
}
void
initwallanim (iev)
struct ImageEnv *iev;
{
if ((nwallanims = createanimloafs (iev, &wallanims)) < 0)
die ("Can't allocate AnimLoaf table.\n");
}
void
closewallanim ()
{
if (wallanims) deleteanimloafs (wallanims), wallanims = NULL;
}
void
cycleanimloafs (al, nal, nvbls)
register struct AnimLoaf *al;
register int32 nal, nvbls;
{
register AnimEntry *ae;
register int n;
while (--nal >= 0) {
ae = al->al_AE;
n = nextanimframe (&al->al_Def, al->al_CurFrame, nvbls);
while (n >= ae->ae_NFrames)
n -= ae->ae_NFrames;
al->al_CurFrame = n;
*ae->ae_Target = ae->ae_Base[n];
al++;
}
}
int32
createanimloafs (iev, alp)
struct ImageEnv *iev;
struct AnimLoaf **alp;
{
register AnimLoaf *al;
register AnimEntry *ae;
register int32 i, n;
if (n = iev->iev_NAnimEntries) {
if (!(al = malloc (sizeof (AnimLoaf) * n)))
return (-1);
for (i = 0, ae = iev->iev_AnimEntries; i < n; i++, ae++) {
al[i].al_Def.ad_FPS = ae->ae_FPS;
al[i].al_Def.ad_Counter = VBLANKFREQ;
al[i].al_CurFrame = 0;
al[i].al_AE = ae;
}
*alp = al;
} else
*alp = NULL;
return (n);
}
void
deleteanimloafs (al)
struct AnimLoaf *al;
{
free (al);
}
void
processgrid ()
{
#define NVU ((NGRIDPOINTS + 31) >> 5)
register Vertex *vert;
register uint32 mask, *mptr;
register int16 *idxp;
register int i, n, x;
Vector backuprow;
Vector skip32;
Vertex point;
skip32.X = plusx.X * 32;
skip32.Y = plusx.Y * 32;
skip32.Z = plusx.Z * 32;
backuprow.X = minusx.X * GRIDSIZ + plusz.X;
backuprow.Y = minusx.Y * GRIDSIZ + plusz.Y;
backuprow.Z = minusx.Z * GRIDSIZ + plusz.Z;
vert = xfverts;
idxp = grididxs;
point = xformsquare[0];
mptr = vertsused;
x = 0;
for (i = NVU; --i >= 0; ) {
mask = *mptr++;
if (!mask) {
idxp += 32;
point.X += skip32.X;
point.Z += skip32.Z;
if ((x += 32) >= GRIDSIZ) {
point.X += backuprow.X;
point.Z += backuprow.Z;
x -= GRIDSIZ;
}
continue;
}
for (n = 32; --n >= 0; mask >>= 1) {
if (mask & 1) {
*vert++ = point;
vert->X = point.X;
vert->Y = point.Y - ONE_F16;
vert->Z = point.Z;
vert++;
*idxp = nvisv++;
}
point.X += plusx.X;
point.Z += plusx.Z;
if (++x >= GRIDSIZ) {
point.X += backuprow.X;
point.Z += backuprow.Z;
x -= GRIDSIZ;
}
idxp++;
}
}
if (nvisv >= MAXWALLVERTS/2)
kprintf ("EEEK! xfverts[] overflow at %d\n", nvisv);
project (xfverts, projverts, MAGIC, 0, CX, cy, nvisv + nvisv);
}
void
processvisobs ()
{
register VisOb *vo;
register int i;
curobv = obverts;
nobverts = 0;
for (vo = visobs, i = nviso; --i >= 0; vo++) {
if (vo->vo_LIdx < 0)
registerobs (vo);
}
if (nviso > MAXVISOBS)
kprintf ("EEEK! visobs[] overflow at %d\n", nviso);
if (nobverts > NOBVERTS)
kprintf ("EEEK! obverts[] overflow! at %d\n", nobverts);
if (nobverts) {
Vector trans;
trans.X = -campos.X;
trans.Y = -campos.Y;
trans.Z = -campos.Z;
translatemany (&trans, obverts, nobverts);
MulManyVec3Mat33_F16 ((VECTCAST) xfobverts,
(VECTCAST) obverts,
(MATCAST) &camera,
nobverts);
project (xfobverts, obverts, MAGIC, 0, CX, cy, nobverts);
}
}
void
initrend ()
{
register CCB *ccb;
register int i;
for (i = MAXVISOBS, ccb = ccbpool; --i >= 0; ccb++)
ccb->ccb_NextPtr = ccb - 1;
if (!(scaledpluts = malloctype (1024, MEMTYPE_CEL)))
die ("Can't allocate memory for scaled PLUTs.\n");
createbackwall ();
}
void
closerend ()
{
if (scaledpluts) freetype (scaledpluts), scaledpluts = NULL;
if (backwallcel) freetype (backwallcel), backwallcel = NULL;
}
/***************************************************************************
* This is the bit that plays out the "death" stream to a CCB, which we
* then render over the display.
*/
uint32 celPPMPs[] = {
PPMPC_1S_PDC | PPMPC_MS_CCB | PPMPC_MF_1 | PPMPC_SF_16 | PPMPC_2S_CFBD | PPMPC_2D_1,
PPMPC_1S_PDC | PPMPC_MS_CCB | PPMPC_MF_2 | PPMPC_SF_16 | PPMPC_2S_CFBD | PPMPC_2D_1,
PPMPC_1S_PDC | PPMPC_MS_CCB | PPMPC_MF_3 | PPMPC_SF_16 | PPMPC_2S_CFBD | PPMPC_2D_1,
PPMPC_1S_PDC | PPMPC_MS_CCB | PPMPC_MF_4 | PPMPC_SF_16 | PPMPC_2S_CFBD | PPMPC_2D_1,
PPMPC_1S_PDC | PPMPC_MS_CCB | PPMPC_MF_5 | PPMPC_SF_16 | PPMPC_2S_CFBD | PPMPC_2D_1,
PPMPC_1S_PDC | PPMPC_MS_CCB | PPMPC_MF_6 | PPMPC_SF_16 | PPMPC_2S_CFBD | PPMPC_2D_1,
PPMPC_1S_PDC | PPMPC_MS_CCB | PPMPC_MF_7 | PPMPC_SF_16 | PPMPC_2S_CFBD | PPMPC_2D_1,
PPMPC_1S_PDC | PPMPC_MS_CCB | PPMPC_MF_8 | PPMPC_SF_16 | PPMPC_2S_CFBD | PPMPC_2D_1,
PPMPC_1S_PDC | PPMPC_MS_CCB | PPMPC_MF_5 | PPMPC_SF_8 | PPMPC_2S_CFBD | PPMPC_2D_1,
PPMPC_1S_PDC | PPMPC_MS_CCB | PPMPC_MF_5 | PPMPC_SF_8 | PPMPC_2S_CFBD | PPMPC_2D_1,
PPMPC_1S_PDC | PPMPC_MS_CCB | PPMPC_MF_6 | PPMPC_SF_8 | PPMPC_2S_CFBD | PPMPC_2D_1,
PPMPC_1S_PDC | PPMPC_MS_CCB | PPMPC_MF_6 | PPMPC_SF_8 | PPMPC_2S_CFBD | PPMPC_2D_1,
PPMPC_1S_PDC | PPMPC_MS_CCB | PPMPC_MF_7 | PPMPC_SF_8 | PPMPC_2S_CFBD | PPMPC_2D_1,
PPMPC_1S_PDC | PPMPC_MS_CCB | PPMPC_MF_7 | PPMPC_SF_8 | PPMPC_2S_CFBD | PPMPC_2D_1,
PPMPC_1S_PDC | PPMPC_MS_CCB | PPMPC_MF_8 | PPMPC_SF_8 | PPMPC_2S_CFBD | PPMPC_2D_1,
PPMPC_1S_PDC | PPMPC_MS_CCB | PPMPC_MF_8 | PPMPC_SF_8 | PPMPC_2S_CFBD | PPMPC_2D_1
};
uint32 fadePPMPs[] = {
PPMPC_1S_CFBD | PPMPC_MS_CCB | PPMPC_MF_1 | PPMPC_SF_8 | PPMPC_2S_0 | PPMPC_2D_2,
PPMPC_1S_CFBD | PPMPC_MS_CCB | PPMPC_MF_2 | PPMPC_SF_8 | PPMPC_2S_0 | PPMPC_2D_2,
PPMPC_1S_CFBD | PPMPC_MS_CCB | PPMPC_MF_3 | PPMPC_SF_8 | PPMPC_2S_0 | PPMPC_2D_2,
PPMPC_1S_CFBD | PPMPC_MS_CCB | PPMPC_MF_4 | PPMPC_SF_8 | PPMPC_2S_0 | PPMPC_2D_2,
PPMPC_1S_CFBD | PPMPC_MS_CCB | PPMPC_MF_5 | PPMPC_SF_8 | PPMPC_2S_0 | PPMPC_2D_2,
PPMPC_1S_CFBD | PPMPC_MS_CCB | PPMPC_MF_6 | PPMPC_SF_8 | PPMPC_2S_0 | PPMPC_2D_2,
PPMPC_1S_CFBD | PPMPC_MS_CCB | PPMPC_MF_7 | PPMPC_SF_8 | PPMPC_2S_0 | PPMPC_2D_2,
PPMPC_1S_CFBD | PPMPC_MS_CCB | PPMPC_MF_8 | PPMPC_SF_8 | PPMPC_2S_0 | PPMPC_2D_2,
PPMPC_1S_CFBD | PPMPC_MS_CCB | PPMPC_MF_1 | PPMPC_SF_8 | PPMPC_2S_CFBD | PPMPC_2D_2,
PPMPC_1S_CFBD | PPMPC_MS_CCB | PPMPC_MF_2 | PPMPC_SF_8 | PPMPC_2S_CFBD | PPMPC_2D_2,
PPMPC_1S_CFBD | PPMPC_MS_CCB | PPMPC_MF_3 | PPMPC_SF_8 | PPMPC_2S_CFBD | PPMPC_2D_2,
PPMPC_1S_CFBD | PPMPC_MS_CCB | PPMPC_MF_4 | PPMPC_SF_8 | PPMPC_2S_CFBD | PPMPC_2D_2,
PPMPC_1S_CFBD | PPMPC_MS_CCB | PPMPC_MF_5 | PPMPC_SF_8 | PPMPC_2S_CFBD | PPMPC_2D_2,
PPMPC_1S_CFBD | PPMPC_MS_CCB | PPMPC_MF_6 | PPMPC_SF_8 | PPMPC_2S_CFBD | PPMPC_2D_2,
PPMPC_1S_CFBD | PPMPC_MS_CCB | PPMPC_MF_7 | PPMPC_SF_8 | PPMPC_2S_CFBD | PPMPC_2D_2,
PPMPC_1S_CFBD | PPMPC_MS_CCB | PPMPC_MF_8 | PPMPC_SF_8 | PPMPC_2S_CFBD | PPMPC_2D_2
};
static CelArray *ca_skull;
static CCB *fader;
void
loadskull ()
{
register struct CCB *ccb;
register int i;
if (!(ca_skull = parse3DO ("skull.cel")))
die ("Couldn't load skull image.\n");
if (!(fader = malloctype (sizeof (CCB), MEMTYPE_CEL | MEMTYPE_FILL)))
die ("Couldn't create fader CCB.\n");
ccb = ca_skull->celptrs[0];
ccb->ccb_Flags |= CCB_LAST | CCB_NPABS | CCB_LDSIZE | CCB_LDPRS |
CCB_LDPPMP | CCB_YOXY | CCB_ACW | ccbextra;
ccb->ccb_Flags &= ~(CCB_ACCW | CCB_TWD);
memcpy (fader, ccb, sizeof (*ccb));
fader->ccb_Flags &= ~CCB_LAST;
fader->ccb_NextPtr = ccb;
for (i = 16; --i >= 0; ) {
fadePPMPs[i] = fadePPMPs[i] | (fadePPMPs[i] << PPMP_1_SHIFT);
celPPMPs[i] = celPPMPs[i] | (celPPMPs[i] << PPMP_1_SHIFT);
}
}
void
freeskull ()
{
freetype (fader); fader = NULL;
freecelarray (ca_skull); ca_skull = NULL;
}
void
simpledeath ()
{
register struct CCB *ccb;
register int i, idx;
Point quad[4];
int32 checkspool;
int cwide, chigh, w, h;
void *tmp;
stopspoolsound (1);
ccb = ca_skull->celptrs[0];
cwide = REALCELDIM (ccb->ccb_Width);
chigh = REALCELDIM (ccb->ccb_Height);
checkspool = TRUE;
for (i = 0; i < 128; i++) {
w = (cwide * (3 * i / 4 + 32)) >> 6;
h = (chigh * (3 * i / 4 + 32)) >> 6;
quad[0].pt_X =
quad[3].pt_X = (wide - w) >> 1;
quad[1].pt_X =
quad[2].pt_X = (wide + w) >> 1;
quad[0].pt_Y =
quad[1].pt_Y = (high - h) >> 1;
quad[2].pt_Y =
quad[3].pt_Y = (high + h) >> 1;
FasterMapCel (ccb, quad);
FasterMapCel (fader, quad);
if ((idx = i >> 3) > 15) idx = 15;
ccb->ccb_PIXC = celPPMPs[idx];
fader->ccb_PIXC = fadePPMPs[15 - idx];
clearscreen (rprend);
DrawCels (rprend->rp_BitmapItem, backwallcel);
DrawCels (rprend->rp_BitmapItem, fader);
tmp = rpvis; rpvis = rprend; rprend = tmp;
DisplayScreen (rpvis->rp_ScreenItem, 0);
if (checkspool && !issoundspooling ()) {
checkspool = FALSE;
spoolsound ("$progdir/aiff/LaughStatic.aiff", 1);
}
WaitVBL (vblIO, 1);
}
WaitVBL (vblIO, 60);
fadetoblank (rpvis, 30);
}
#if 0
/* It won't work... */
void
playdeath ()
{
static Point fullscr[4] = {
0, 0, 320, 0, 320, 240, 0, 240
};
register CCB *ccb;
openstream ("$progdir/Ganymede");
startstream ();
while (!endofstream ()) {
WaitVBL (vblIO, 1);
if (ccb = getstreamccb ()) {
ccb->ccb_Flags |= CCB_LAST;
ccb->ccb_NextPtr= NULL;
ccb->ccb_PIXC =
PPMP_MODE_AVERAGE | (PPMP_MODE_AVERAGE << 16);
FasterMapCel (ccb, fullscr);
DrawCels (rprend->rp_BitmapItem, backwallcel);
DrawCels (rprend->rp_BitmapItem, ccb);
}
}
stopstream ();
closestream ();
}
#endif
/***************************************************************************
* The following code has been converted to assembly code, which probably
* doesn't run much faster than the compiled stuff, since I don't seem to
* be quite a good enough ARM programmer to reliably outstrip the compiler.
*
* If you need to revert to something more malleable, take out the #if
* and #endif statements.
*/
static uint32 leftmasks[] = {
0xFFFFFFFF, 0x7FFFFFFF, 0x3FFFFFFF, 0x1FFFFFFF,
0x0FFFFFFF, 0x07FFFFFF, 0x03FFFFFF, 0x01FFFFFF,
0x00FFFFFF, 0x007FFFFF, 0x003FFFFF, 0x001FFFFF,
0x000FFFFF, 0x0007FFFF, 0x0003FFFF, 0x0001FFFF,
0x0000FFFF, 0x00007FFF, 0x00003FFF, 0x00001FFF,
0x00000FFF, 0x000007FF, 0x000003FF, 0x000001FF,
0x000000FF, 0x0000007F, 0x0000003F, 0x0000001F,
0x0000000F, 0x00000007, 0x00000003, 0x00000001
};
static uint32 rightmasks[] = {
0x80000000, 0xC0000000, 0xE0000000, 0xF0000000,
0xF8000000, 0xFC000000, 0xFE000000, 0xFF000000,
0xFF800000, 0xFFC00000, 0xFFE00000, 0xFFF00000,
0xFFF80000, 0xFFFC0000, 0xFFFE0000, 0xFFFF0000,
0xFFFF8000, 0xFFFFC000, 0xFFFFE000, 0xFFFFF000,
0xFFFFF800, 0xFFFFFC00, 0xFFFFFE00, 0xFFFFFF00,
0xFFFFFF80, 0xFFFFFFC0, 0xFFFFFFE0, 0xFFFFFFF0,
0xFFFFFFF8, 0xFFFFFFFC, 0xFFFFFFFE, 0xFFFFFFFF
};
int
testlinebuf (linebuf, lx, rx)
register uint32 *linebuf;
register int32 lx, rx;
{
register uint32 lm, rm;
if (lx == rx)
return (FALSE);
rx--;
if (lx > rx) {
lx ^= rx; rx ^= lx; lx ^= rx;
}
if (lx >= 320 || rx < 0)
return (FALSE);
if (lx < 0) lx = 0;
if (rx >= 320) rx = 320;
lm = leftmasks[lx & 31];
rm = rightmasks[rx & 31];
lx >>= 5;
rx >>= 5;
if (lx == rx) {
lm &= rm;
return ((linebuf[lx] & lm) != 0);
} else {
if (linebuf[lx] & lm)
return (TRUE);
lm = ~0;
do {
if (++lx == rx)
lm = rm;
if (linebuf[lx] & lm)
return (TRUE);
} while (lx < rx);
return (FALSE);
}
}
#if 0
/*
* Returns TRUE if you need to draw a polygon; FALSE if you don't.
* The specified region is marked as used both cases.
* Note: Marking a region actually means clearing the bits.
*/
int
testmarklinebuf (dummy, lx, rx)
uint32 *dummy;
register int32 lx, rx;
{
register uint32 lm, rm;
if (lx == rx)
return (FALSE);
rx--;
if (lx > rx) {
lx ^= rx; rx ^= lx; lx ^= rx;
}
if (lx >= 320 || rx < 0)
return (FALSE);
if (lx < 0) lx = 0;
if (rx >= 320) rx = 320;
lm = leftmasks[lx & 31];
rm = rightmasks[rx & 31];
lx >>= 5;
rx >>= 5;
if (lx == rx) {
lm &= rm;
if (linebuf[lx] & lm) {
linebuf[lx] &= ~lm;
return (TRUE);
} else
return (FALSE);
} else {
register int result = FALSE;
if (linebuf[lx] & lm)
result = TRUE;
linebuf[lx] &= ~lm;
lm = ~0;
do {
if (++lx == rx)
lm = rm;
if (linebuf[lx] & lm)
result = TRUE;
linebuf[lx] &= ~lm;
} while (lx < rx);
return (result);
}
}
void
resetlinebuf (dummy)
uint32 *dummy;
{
register int32 *lb;
register int i;
lb = (int32 *) linebuf;
for (i = 10; --i >= 0; )
*lb++ = ~0;
}
int
islinefull (dummy)
uint32 *dummy;
{
register int32 *lb;
register int i;
lb = (int32 *) linebuf;
for (i = 10; --i >= 0; )
if (*lb++)
return (FALSE);
return (TRUE);
}
#endif
/***************************************************************************
* Fade a cel into the distance.
* value is a fixed-point quantity. 0 == totally black, 1.0 == totally
* visible.
*
* This is an expensive operation. I'm relying on the probability that this
* will be done seldom enough to not impact the frame rate significantly.
*/
void
fadecel (ccb, value)
register struct CCB *ccb;
frac16 value;
{
register uint32 pre0;
if (ccb->ccb_Flags & CCB_CCBPRE)
pre0 = ccb->ccb_PRE0;
else
pre0 = * (int32 *) ccb->ccb_SourcePtr;
if ((pre0 & PRE0_BPP_MASK) == PRE0_BPP_8 && !(pre0 & PRE0_LINEAR))
{
/*
* Ack! Coded-8. We have to hack the whole PLUT.
**
* ewhac 9308.03: This has yet to be, like, actually tested.
*/
register int16 *src, *dest;
register int i, r, g, b;
src = (int16 *) ccb->ccb_PLUTPtr;
dest = curscaledplut;
ccb->ccb_PLUTPtr = dest;
for (i = 32; --i >= 0; ) {
b = *src++;
r = (b >> 10) & 0x1F;
g = (b >> 5) & 0x1F;
b &= 0x1F;
r = r * value >> 16;
g = g * value >> 16;
b = b * value >> 16;
*dest++ = b | (g << 5) | (r << 10);
}
curscaledplut = dest;
} else {
/*
* Ahhh, pleasanter. We need only dink the PpIpXmCp.
* This will screw up Doloresizing, but at that distance,
* who cares?
*/
register int32 val0, val1;
val0 = ccb->ccb_PIXC & PPMPC_MF_MASK;
val1 = (ccb->ccb_PIXC >> PPMP_1_SHIFT) & PPMPC_MF_MASK;
val0 = (val0 * value >> 16) & PPMPC_MF_MASK;
val1 = (val1 * value >> 16) & PPMPC_MF_MASK;
ccb->ccb_PIXC &= ~(PPMPC_MF_MASK |
(PPMPC_MF_MASK << PPMP_1_SHIFT));
ccb->ccb_PIXC |= val0 | (val1 << PPMP_1_SHIFT);
}
}
/***************************************************************************
* Generate "backwall" cel that will fade ceiling and floor nicely to black.
* (Part of initrend()?)
*
* Ideally, this routine will if() out the entire CCB creation and
* initialization section, making it part of the openstuff() path.
*/
void
createbackwall ()
{
static Vertex stuff[4] = {
{ 0, -HALF_F16, ZFADENEAR_F16 },
{ 0, -HALF_F16, ZFADEFAR_F16 },
{ 0, HALF_F16, ZFADEFAR_F16 },
{ 0, HALF_F16, ZFADENEAR_F16 },
};
register int32 i;
int32 *pdat;
int32 ydim, size, diff, color, r, g, b;
if (!stuff[0].X) {
project (stuff, stuff, MAGIC, 0, CX, cy, 4);
stuff[0].X = 1;
}
ydim = stuff[3].Y - stuff[0].Y;
size = sizeof (CCB) + ydim * sizeof (int32) * 2;
if (!(backwallcel = malloctype (size, MEMTYPE_CEL)))
die ("Can't create backwall.\n");
pdat = (int32 *) (backwallcel + 1);
backwallcel->ccb_Flags = CCB_NPABS | CCB_SPABS | CCB_LDSIZE |
CCB_LDPRS | CCB_LDPPMP | CCB_CCBPRE |
CCB_YOXY | CCB_ACW | CCB_ACCW | CCB_ACE |
CCB_BGND | CCB_NOBLK;
backwallcel->ccb_SourcePtr = (CelData *) pdat;
backwallcel->ccb_PLUTPtr= NULL;
backwallcel->ccb_PIXC = 0x1F001F00;
backwallcel->ccb_PRE0 = PRE0_LITERAL | PRE0_BGND | PRE0_LINEAR |
PRE0_BPP_16 |
((ydim - PRE0_VCNT_PREFETCH) <<
PRE0_VCNT_SHIFT);
backwallcel->ccb_PRE1 = (0 << PRE1_WOFFSET10_SHIFT) |
PRE1_TLLSB_PDC0 |
(2 - PRE1_TLHPCNT_PREFETCH);
backwallcel->ccb_Width = 2;
backwallcel->ccb_Height = ydim;
backwallcel->ccb_XPos = 0;
backwallcel->ccb_YPos = (cy - ydim / 2) << 16;
backwallcel->ccb_HDX = 160 << 20;
backwallcel->ccb_VDX = 0;
backwallcel->ccb_HDY = 0;
backwallcel->ccb_VDY = 1 << 16;
backwallcel->ccb_HDDX =
backwallcel->ccb_HDDY = 0;
/*
* Gradation from ceiling color to black.
*/
r = (ceilingcolor >> 10) & 0x1f;
g = (ceilingcolor >> 5) & 0x1f;
b = ceilingcolor & 0x1f;
diff = stuff[1].Y - stuff[0].Y;
for (i = diff; --i >= 0; ) {
color = ((r * i / diff) << 10) +
((g * i / diff) << 5) +
(b * i / diff);
color |= color << 16;
*pdat++ = color;
*pdat++ = color;
}
/*
* Middle black band.
*/
diff = stuff[2].Y - stuff[1].Y;
for (i = diff; --i >= 0; ) {
*pdat++ = 0;
*pdat++ = 0;
}
/*
* Gradation from black to floor color.
*/
r = (floorcolor >> 10) & 0x1f;
g = (floorcolor >> 5) & 0x1f;
b = floorcolor & 0x1f;
diff = stuff[3].Y - stuff[2].Y;
for (i = 0; i < diff; i++) {
color = ((r * i / diff) << 10) +
((g * i / diff) << 5) +
(b * i / diff);
color |= color << 16;
*pdat++ = color;
*pdat++ = color;
}
}
/***************************************************************************
* Take a cel and a cel and create position and delta values to map
* its corners onto the specified quadrilateral.
**
* ewhac 9306.10: Optimizes for power-of-two edges, which are flagged by
* negative Width/Height fields.
*
* If Width/Height are positive, the dimension is the value.
* If negative or zero, the dimension is 1 << -value, i.e. it's a shift
* count.
*/
void
FasterMapCel (ccb, p)
register struct CCB *ccb;
register struct Point *p;
{
register int32 wide, high;
register int i = 2;
ccb->ccb_XPos = (p[0].pt_X << 16) + 0x8000;
ccb->ccb_YPos = (p[0].pt_Y << 16) + 0x8000;