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remove gxt and gyt, as they are unnecessary

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also add a few comments to explain what tx/tz are
This commit is contained in:
Monster Iestyn 2020-05-19 16:48:50 +01:00
parent 6f854f2de3
commit dd42682791
1 changed files with 9 additions and 31 deletions
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40
src/r_things.c
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@ -1346,7 +1346,6 @@ static void R_ProjectSprite(mobj_t *thing)
{
mobj_t *oldthing = thing;
fixed_t tr_x, tr_y;
fixed_t gxt, gyt;
fixed_t tx, tz;
fixed_t xscale, yscale, sortscale; //added : 02-02-98 : aaargll..if I were a math-guy!!!
@ -1399,18 +1398,13 @@ static void R_ProjectSprite(mobj_t *thing)
tr_x = thing->x - viewx;
tr_y = thing->y - viewy;
gxt = FixedMul(tr_x, viewcos);
gyt = -FixedMul(tr_y, viewsin);
tz = gxt-gyt;
tz = FixedMul(tr_x, viewcos) + FixedMul(tr_y, viewsin); // near/far distance
// thing is behind view plane?
if (!papersprite && (tz < FixedMul(MINZ, this_scale))) // papersprite clipping is handled later
return;
gxt = -FixedMul(tr_x, viewsin);
gyt = FixedMul(tr_y, viewcos);
basetx = tx = -(gyt + gxt);
basetx = tx = FixedMul(tr_x, viewsin) - FixedMul(tr_y, viewcos); // sideways distance
// too far off the side?
if (!papersprite && abs(tx) > tz<<2) // papersprite clipping is handled later
@ -1561,15 +1555,11 @@ static void R_ProjectSprite(mobj_t *thing)
tr_x += FixedMul(offset, cosmul);
tr_y += FixedMul(offset, sinmul);
gxt = FixedMul(tr_x, viewcos);
gyt = -FixedMul(tr_y, viewsin);
tz = gxt-gyt;
tz = FixedMul(tr_x, viewcos) + FixedMul(tr_y, viewsin);
yscale = FixedDiv(projectiony, tz);
//if (yscale < 64) return; // Fix some funky visuals
gxt = -FixedMul(tr_x, viewsin);
gyt = FixedMul(tr_y, viewcos);
tx = -(gyt + gxt);
tx = FixedMul(tr_x, viewsin) - FixedMul(tr_y, viewcos);
xscale = FixedDiv(projection, tz);
x1 = (centerxfrac + FixedMul(tx,xscale))>>FRACBITS;
@ -1585,15 +1575,11 @@ static void R_ProjectSprite(mobj_t *thing)
tr_x += FixedMul(offset2, cosmul);
tr_y += FixedMul(offset2, sinmul);
gxt = FixedMul(tr_x, viewcos);
gyt = -FixedMul(tr_y, viewsin);
tz2 = gxt-gyt;
tz2 = FixedMul(tr_x, viewcos) + FixedMul(tr_y, viewsin);
yscale2 = FixedDiv(projectiony, tz2);
//if (yscale2 < 64) return; // ditto
gxt = -FixedMul(tr_x, viewsin);
gyt = FixedMul(tr_y, viewcos);
tx2 = -(gyt + gxt);
tx2 = FixedMul(tr_x, viewsin) - FixedMul(tr_y, viewcos);
xscale2 = FixedDiv(projection, tz2);
x2 = ((centerxfrac + FixedMul(tx2,xscale2))>>FRACBITS);
@ -1670,9 +1656,7 @@ static void R_ProjectSprite(mobj_t *thing)
tr_x = thing->x - viewx;
tr_y = thing->y - viewy;
gxt = FixedMul(tr_x, viewcos);
gyt = -FixedMul(tr_y, viewsin);
tz = gxt-gyt;
tz = FixedMul(tr_x, viewcos) + FixedMul(tr_y, viewsin);
linkscale = FixedDiv(projectiony, tz);
if (tz < FixedMul(MINZ, this_scale))
@ -1872,7 +1856,6 @@ static void R_ProjectSprite(mobj_t *thing)
static void R_ProjectPrecipitationSprite(precipmobj_t *thing)
{
fixed_t tr_x, tr_y;
fixed_t gxt, gyt;
fixed_t tx, tz;
fixed_t xscale, yscale; //added : 02-02-98 : aaargll..if I were a math-guy!!!
@ -1893,18 +1876,13 @@ static void R_ProjectPrecipitationSprite(precipmobj_t *thing)
tr_x = thing->x - viewx;
tr_y = thing->y - viewy;
gxt = FixedMul(tr_x, viewcos);
gyt = -FixedMul(tr_y, viewsin);
tz = gxt - gyt;
tz = FixedMul(tr_x, viewcos) + FixedMul(tr_y, viewsin); // near/far distance
// thing is behind view plane?
if (tz < MINZ)
return;
gxt = -FixedMul(tr_x, viewsin);
gyt = FixedMul(tr_y, viewcos);
tx = -(gyt + gxt);
tx = FixedMul(tr_x, viewsin) - FixedMul(tr_y, viewcos); // sideways distance
// too far off the side?
if (abs(tx) > tz<<2)