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- Fixed: When R_DrawTiltedPlane() calculates the p vector, it can overflow

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if the view is near the bounds of the fixed point coordinate system. This
  happens because it rotates the view position around (0,0) according to
  the current viewangle, so the resultant coordinate may be outside the
  bounds of fixed point. All important math in this function is now done
  entirely in floating point.
- Fixed: Slopes didn't draw right on 64-bit platforms.


SVN r986 (trunk)
This commit is contained in:
Randy Heit 2008-05-22 05:17:21 +00:00
parent befdd0b41f
commit 7160e09b04
7 changed files with 85 additions and 78 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
docs/rh-log.txt
View file

@ -1,3 +1,12 @@
May 21, 2008
- Fixed: When R_DrawTiltedPlane() calculates the p vector, it can overflow
if the view is near the bounds of the fixed point coordinate system. This
happens because it rotates the view position around (0,0) according to
the current viewangle, so the resultant coordinate may be outside the
bounds of fixed point. All important math in this function is now done
entirely in floating point.
- Fixed: Slopes didn't draw right on 64-bit platforms.
May 20, 2008
- Fixed: With hardware 2D, the console and menu need not reimplement palette
flashes to ensure their visibility.

4
src/mscinlines.h
View file

@ -343,7 +343,7 @@ __forceinline SDWORD ksgn (SDWORD a)
__forceinline int toint (float v)
{
QWORD res;
SQWORD res;
__asm fld v;
__asm fistp res;
return (int)res;
@ -351,7 +351,7 @@ __forceinline int toint (float v)
__forceinline int quickertoint (float v)
{
DWORD res;
SDWORD res;
__asm fld v;
__asm fistp res;
return (int)res;

1
src/p_mobj.cpp
View file

@ -2552,7 +2552,6 @@ void AActor::Tick ()
}
else
{
AInventory * item = Inventory;
// Handle powerup effects here so that the order is controlled

6
src/r_defs.h
View file

@ -140,6 +140,12 @@ struct secplane_t
return FixedMul (ic, -d - DMulScale16 (a, x, b, y));
}
// Returns the value of z at (x,y) as a double
double ZatPoint (double x, double y) const
{
return (d + a*x + b*y) * ic / (-65536.0 * 65536.0);
}
// Returns the value of z at vertex v
fixed_t ZatPoint (const vertex_t *v) const
{

113
src/r_plane.cpp
View file

@ -315,7 +315,7 @@ void R_MapTiltedPlane (int y, int x1)
{
int x2 = spanend[y];
int width = x2 - x1;
float iz, uz, vz;
double iz, uz, vz;
BYTE *fb;
DWORD u, v;
int i;
@ -344,10 +344,10 @@ void R_MapTiltedPlane (int y, int x1)
i = 0;
do
{
float z = 1.f/iz;
double z = 1.f/iz;
u = toint (uz*z) + pviewx;
v = toint (vz*z) + pviewy;
u = SQWORD(uz*z) + pviewx;
v = SQWORD(vz*z) + pviewy;
ds_colormap = tiltlighting[i];
fb[i++] = ds_colormap[ds_source[(v >> vshift) | ((u >> ushift) & umask)]];
iz += plane_sz[0];
@ -362,10 +362,10 @@ void R_MapTiltedPlane (int y, int x1)
#define SPANSIZE 16
#define INVSPAN 0.0625f
float startz = 1.f/iz;
float startu = uz*startz;
float startv = vz*startz;
float izstep, uzstep, vzstep;
double startz = 1.f/iz;
double startu = uz*startz;
double startv = vz*startz;
double izstep, uzstep, vzstep;
izstep = plane_sz[0] * SPANSIZE;
uzstep = plane_su[0] * SPANSIZE;
@ -379,13 +379,13 @@ void R_MapTiltedPlane (int y, int x1)
uz += uzstep;
vz += vzstep;
float endz = 1.f/iz;
float endu = uz*endz;
float endv = vz*endz;
DWORD stepu = toint ((endu - startu) * INVSPAN);
DWORD stepv = toint ((endv - startv) * INVSPAN);
u = toint (startu) + pviewx;
v = toint (startv) + pviewy;
double endz = 1.f/iz;
double endu = uz*endz;
double endv = vz*endz;
DWORD stepu = SQWORD((endu - startu) * INVSPAN);
DWORD stepv = SQWORD((endv - startv) * INVSPAN);
u = SQWORD(startu) + pviewx;
v = SQWORD(startv) + pviewy;
for (i = SPANSIZE-1; i >= 0; i--)
{
@ -403,25 +403,25 @@ void R_MapTiltedPlane (int y, int x1)
{
if (width == 1)
{
u = toint (startu);
v = toint (startv);
u = SQWORD(startu);
v = SQWORD(startv);
fb[x1] = *(tiltlighting[x1] + ds_source[(v >> vshift) | ((u >> ushift) & umask)]);
}
else
{
float left = (float)width;
double left = width;
iz += plane_sz[0] * left;
uz += plane_su[0] * left;
vz += plane_sv[0] * left;
float endz = 1.f/iz;
float endu = uz*endz;
float endv = vz*endz;
double endz = 1.f/iz;
double endu = uz*endz;
double endv = vz*endz;
left = 1.f/left;
DWORD stepu = toint ((endu - startu) * left);
DWORD stepv = toint ((endv - startv) * left);
u = toint (startu) + pviewx;
v = toint (startv) + pviewy;
DWORD stepu = SQWORD((endu - startu) * left);
DWORD stepv = SQWORD((endv - startv) * left);
u = SQWORD(startu) + pviewx;
v = SQWORD(startv) + pviewy;
for (; width != 0; width--)
{
@ -1447,66 +1447,59 @@ void R_DrawTiltedPlane (visplane_t *pl, fixed_t alpha, bool masked)
/*, 0.0009765625f, 0.00048828125f, 0.000244140625f,
1.220703125e-4f, 6.103515625e-5, 3.0517578125e-5*/
};
float lxscale, lyscale;
float xscale, yscale;
fixed_t ixscale, iyscale;
angle_t ang;
double lxscale, lyscale;
double xscale, yscale;
FVector3 p, m, n;
fixed_t zeroheight;
double ang;
double zeroheight;
if (alpha <= 0)
{
return;
}
// p is the texture origin in view space
// Don't add in the offsets at this stage, because doing so can result in
// errors if the flat is rotated.
double vx = FIXED2FLOAT(viewx);
double vy = FIXED2FLOAT(viewy);
double vz = FIXED2FLOAT(viewz);
lxscale = FIXED2FLOAT(pl->xscale) * ifloatpow2[ds_xbits];
lyscale = FIXED2FLOAT(pl->yscale) * ifloatpow2[ds_ybits];
xscale = 64.f / lxscale;
yscale = 64.f / lyscale;
ixscale = quickertoint(xscale*65536.f);
iyscale = quickertoint(yscale*65536.f);
zeroheight = pl->height.ZatPoint (viewx, viewy);
zeroheight = pl->height.ZatPoint(vx, vy);
pviewx = MulScale (pl->xoffs, pl->xscale, ds_xbits);
pviewy = MulScale (pl->yoffs, pl->yscale, ds_ybits);
ang = (ANG270 - viewangle) >> ANGLETOFINESHIFT;
// Printf ("%u %d %d\n", ang, finecosine[ang], finesine[ang]);
p[0] = FIXED2FLOAT(DMulScale16 (viewx, finecosine[ang], -viewy, finesine[ang]));
p[2] = FIXED2FLOAT(DMulScale16 (viewx, finesine[ang], viewy, finecosine[ang]));
// double dang = 1.5*M_PI - double(viewangle)*M_PI/2147483648.0;
// double vx = viewx/65536.0, vy = viewy/65536.0;
// double dcos = cos(dang), dsin = sin(dang);
// p[0] = vx * dcos - vy * dsin;
// p[2] = vx * dsin + vy * dcos;
p[1] = FIXED2FLOAT(pl->height.ZatPoint (0, 0) - viewz);
// p is the texture origin in view space
// Don't add in the offsets at this stage, because doing so can result in
// errors if the flat is rotated.
ang = bam2rad(ANG270 - viewangle);
p[0] = vx * cos(ang) - vy * sin(ang);
p[2] = vx * sin(ang) + vy * cos(ang);
p[1] = pl->height.ZatPoint(0.0, 0.0) - vz;
// m is the v direction vector in view space
ang = (ANG180 - viewangle - pl->angle) >> ANGLETOFINESHIFT;
m[0] = yscale * FIXED2FLOAT(finecosine[ang]);
m[2] = yscale * FIXED2FLOAT(finesine[ang]);
ang = bam2rad(ANG180 - viewangle - pl->angle);
m[0] = yscale * cos(ang);
m[2] = yscale * sin(ang);
// m[1] = FIXED2FLOAT(pl->height.ZatPoint (0, iyscale) - pl->height.ZatPoint (0,0));
// VectorScale2 (m, 64.f/VectorLength(m));
// n is the u direction vector in view space
ang = (ang + (ANG90>>ANGLETOFINESHIFT)) & FINEMASK;
n[0] = -xscale * FIXED2FLOAT(finecosine[ang]);
n[2] = -xscale * FIXED2FLOAT(finesine[ang]);
ang += PI/2;
n[0] = -xscale * cos(ang);
n[2] = -xscale * sin(ang);
// n[1] = FIXED2FLOAT(pl->height.ZatPoint (ixscale, 0) - pl->height.ZatPoint (0,0));
// VectorScale2 (n, 64.f/VectorLength(n));
ang = pl->angle >> ANGLETOFINESHIFT;
m[1] = FIXED2FLOAT(pl->height.ZatPoint (
viewx + MulScale16 (iyscale, finesine[ang]),
viewy + MulScale16 (iyscale, finecosine[ang])) - zeroheight);
ang = (pl->angle + ANGLE_90) >> ANGLETOFINESHIFT;
n[1] = FIXED2FLOAT(pl->height.ZatPoint (
viewx + MulScale16 (ixscale, finesine[ang]),
viewy + MulScale16 (ixscale, finecosine[ang])) - zeroheight);
// This code keeps the texture coordinates constant across the x,y plane no matter
// how much you slope the surface. Use the commented-out code above instead to keep
// the textures a constant size across the surface's plane instead.
ang = bam2rad(pl->angle);
m[1] = pl->height.ZatPoint(vx + yscale * sin(ang), vy + yscale * cos(ang)) - zeroheight;
ang += PI/2;
n[1] = pl->height.ZatPoint(vx + xscale * sin(ang), vy + xscale * cos(ang)) - zeroheight;
plane_su = p ^ m;
plane_sv = p ^ n;

5
src/tables.h
View file

@ -120,4 +120,9 @@ inline int SlopeDiv (unsigned int num, unsigned den)
return ans <= SLOPERANGE ? ans : SLOPERANGE;
}
inline double bam2rad(angle_t ang)
{
return double(ang >> 1) * (PI / ANGLE_90);
}
#endif // __TABLES_H__

25
zdoom.sln
View file

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