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Prevent texture wobbling on planes with no flat alignment

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This commit is contained in:
Jaime Ita Passos 2021-04-27 22:59:06 -03:00
parent 0fba870a35
commit 8f47a7e9cc
1 changed files with 72 additions and 30 deletions
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102
src/r_plane.c
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@ -690,16 +690,16 @@ static void R_DrawSkyPlane(visplane_t *pl)
}
}
// Returns the height of the sloped plane at (px, py) as a floating point number
static float R_GetSlopeZAt(const pslope_t *slope, fixed_t px, fixed_t py)
// Returns the height of the sloped plane at (x, y) as a 32.16 fixed_t
static INT64 R_GetSlopeZAt(const pslope_t *slope, fixed_t x, fixed_t y)
{
float x = FixedToFloat(px - slope->o.x);
float y = FixedToFloat(py - slope->o.y);
x = ((INT64)x - (INT64)slope->o.x);
y = ((INT64)y - (INT64)slope->o.y);
x = (x * FixedToFloat(slope->d.x));
y = (y * FixedToFloat(slope->d.y));
x = (x * (INT64)slope->d.x) / FRACUNIT;
y = (y * (INT64)slope->d.y) / FRACUNIT;
return FixedToFloat(slope->o.z) + ((x + y) * FixedToFloat(slope->zdelta));
return (INT64)slope->o.z + ((x + y) * (INT64)slope->zdelta) / FRACUNIT;
}
// Sets the texture origin vector of the sloped plane.
@ -709,7 +709,6 @@ static void R_SetSlopePlaneOrigin(pslope_t *slope, fixed_t xpos, fixed_t ypos, f
float vx = FixedToFloat(xpos + xoff);
float vy = FixedToFloat(ypos - yoff);
float vz = FixedToFloat(zpos);
float ang = ANG2RAD(ANGLE_270 - angle);
// p is the texture origin in view space
@ -717,7 +716,7 @@ static void R_SetSlopePlaneOrigin(pslope_t *slope, fixed_t xpos, fixed_t ypos, f
// errors if the flat is rotated.
p->x = vx * cos(ang) - vy * sin(ang);
p->z = vx * sin(ang) + vy * cos(ang);
p->y = R_GetSlopeZAt(slope, -xoff, yoff) - vz;
p->y = (R_GetSlopeZAt(slope, -xoff, yoff) - zpos) / (float)FRACUNIT;
}
// This function calculates all of the vectors necessary for drawing a sloped plane.
@ -844,14 +843,37 @@ static inline void R_AdjustSlopeCoordinates(visplane_t *pl)
const fixed_t cosinecomponent = FINECOSINE(pl->plangle>>ANGLETOFINESHIFT);
const fixed_t sinecomponent = FINESINE(pl->plangle>>ANGLETOFINESHIFT);
fixed_t temp = xoffs;
xoffs = (FixedMul(temp,cosinecomponent) & modmask) + (FixedMul(yoffs,sinecomponent) & modmask);
yoffs = (-FixedMul(temp,sinecomponent) & modmask) + (FixedMul(yoffs,cosinecomponent) & modmask);
fixed_t ox, oy, temp;
temp = xoffs & modmask;
yoffs &= modmask;
xoffs = FixedMul(temp,cosinecomponent)+FixedMul(yoffs,-sinecomponent); // negative sine for opposite direction
yoffs = -FixedMul(temp,-sinecomponent)+FixedMul(yoffs,cosinecomponent);
if (!pl->plangle)
{
ox = (FixedMul(pl->slope->o.x,cosinecomponent) & modmask) - (FixedMul(pl->slope->o.y,sinecomponent) & modmask);
oy = (-FixedMul(pl->slope->o.x,sinecomponent) & modmask) - (FixedMul(pl->slope->o.y,cosinecomponent) & modmask);
temp = ox & modmask;
oy &= modmask;
ox = FixedMul(temp,cosinecomponent)+FixedMul(oy,-sinecomponent); // negative sine for opposite direction
oy = -FixedMul(temp,-sinecomponent)+FixedMul(oy,cosinecomponent);
}
if (xoffs || yoffs)
{
temp = xoffs;
xoffs = (FixedMul(temp,cosinecomponent) & modmask) + (FixedMul(yoffs,sinecomponent) & modmask);
yoffs = (-FixedMul(temp,sinecomponent) & modmask) + (FixedMul(yoffs,cosinecomponent) & modmask);
temp = xoffs & modmask;
yoffs &= modmask;
xoffs = FixedMul(temp,cosinecomponent)+FixedMul(yoffs,-sinecomponent); // ditto
yoffs = -FixedMul(temp,-sinecomponent)+FixedMul(yoffs,cosinecomponent);
}
if (!pl->plangle)
{
xoffs -= (pl->slope->o.x - ox);
yoffs += (pl->slope->o.y + oy);
}
}
static inline void R_AdjustSlopeCoordinatesNPO2(visplane_t *pl)
@ -862,14 +884,37 @@ static inline void R_AdjustSlopeCoordinatesNPO2(visplane_t *pl)
const fixed_t cosinecomponent = FINECOSINE(pl->plangle>>ANGLETOFINESHIFT);
const fixed_t sinecomponent = FINESINE(pl->plangle>>ANGLETOFINESHIFT);
fixed_t temp = xoffs;
xoffs = (FixedMul(temp,cosinecomponent) % modmaskw) + (FixedMul(yoffs,sinecomponent) % modmaskh);
yoffs = (-FixedMul(temp,sinecomponent) % modmaskw) + (FixedMul(yoffs,cosinecomponent) % modmaskh);
fixed_t ox, oy, temp;
temp = xoffs % modmaskw;
yoffs %= modmaskh;
xoffs = FixedMul(temp,cosinecomponent)+FixedMul(yoffs,-sinecomponent); // ditto
yoffs = -FixedMul(temp,-sinecomponent)+FixedMul(yoffs,cosinecomponent);
if (!pl->plangle)
{
ox = (FixedMul(pl->slope->o.x,cosinecomponent) % modmaskw) - (FixedMul(pl->slope->o.y,sinecomponent) % modmaskh);
oy = (-FixedMul(pl->slope->o.x,sinecomponent) % modmaskw) - (FixedMul(pl->slope->o.y,cosinecomponent) % modmaskh);
temp = ox % modmaskw;
oy %= modmaskh;
ox = FixedMul(temp,cosinecomponent)+FixedMul(oy,-sinecomponent); // negative sine for opposite direction
oy = -FixedMul(temp,-sinecomponent)+FixedMul(oy,cosinecomponent);
}
if (xoffs || yoffs)
{
temp = xoffs;
xoffs = (FixedMul(temp,cosinecomponent) % modmaskw) + (FixedMul(yoffs,sinecomponent) % modmaskh);
yoffs = (-FixedMul(temp,sinecomponent) % modmaskw) + (FixedMul(yoffs,cosinecomponent) % modmaskh);
temp = xoffs % modmaskw;
yoffs %= modmaskh;
xoffs = FixedMul(temp,cosinecomponent)+FixedMul(yoffs,-sinecomponent); // ditto
yoffs = -FixedMul(temp,-sinecomponent)+FixedMul(yoffs,cosinecomponent);
}
if (!pl->plangle)
{
xoffs -= (pl->slope->o.x - ox);
yoffs += (pl->slope->o.y + oy);
}
}
void R_DrawSinglePlane(visplane_t *pl)
@ -1049,13 +1094,10 @@ void R_DrawSinglePlane(visplane_t *pl)
if (pl->slope)
{
if (xoffs || yoffs)
{
if (ds_powersoftwo)
R_AdjustSlopeCoordinates(pl);
else
R_AdjustSlopeCoordinatesNPO2(pl);
}
if (ds_powersoftwo)
R_AdjustSlopeCoordinates(pl);
else
R_AdjustSlopeCoordinatesNPO2(pl);
if (planeripple.active)
{