stjr/SRB2
0
0
Fork 0
mirror of https://git.do.srb2.org/STJr/SRB2.git synced 2025-01-22 01:01:45 +00:00
Code Issues Projects Releases Packages Wiki Activity

Use floating point GetSlopeZAt for the texture origin vector

Browse source
This commit is contained in:
Jaime Ita Passos 2021-04-27 20:32:41 -03:00
parent e4b8dc6584
commit 1c6296653a
1 changed files with 14 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

15
src/r_plane.c
View file

@ -690,6 +690,18 @@ 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)
{
float x = FixedToFloat(px - slope->o.x);
float y = FixedToFloat(py - slope->o.y);
x = (x * FixedToFloat(slope->d.x));
y = (y * FixedToFloat(slope->d.y));
return FixedToFloat(slope->o.z) + ((x + y) * FixedToFloat(slope->zdelta));
}
// Sets the texture origin vector of the sloped plane.
static void R_SetSlopePlaneOrigin(pslope_t *slope, fixed_t xpos, fixed_t ypos, fixed_t zpos, fixed_t xoff, fixed_t yoff, fixed_t angle)
{
@ -697,6 +709,7 @@ 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
@ -704,7 +717,7 @@ 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 = FixedToFloat(P_GetSlopeZAt(slope, -xoff, yoff) - zpos);
p->y = R_GetSlopeZAt(slope, -xoff, yoff) - vz;
}
// This function calculates all of the vectors necessary for drawing a sloped plane.