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- don't use finetangent for generating xviewtoangle.

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This commit is contained in:
Christoph Oelckers 2016-04-28 13:03:48 +02:00
parent 26f54b0ba4
commit f301cf7c57
1 changed files with 12 additions and 12 deletions
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24
src/r_main.cpp
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@ -175,19 +175,21 @@ static int lastcenteryfrac;
static inline int viewangletox(int i)
{
if (finetangent[i] > FRACUNIT*2)
const double pimul = M_PI * 2 / FINEANGLES;
// Don't waste time calculating the tangent of values outside the valid range.
// Checking the index where tan(i) becomes too large is a lot faster
if (i <= 604) // 604 is the highest index with finetangent < -2*FRACUNIT
{
return viewwidth + 1;
}
else if (i >= 4096 - 604) // same as above with reversed signs
{
return -1;
}
else if (finetangent[i] < -FRACUNIT*2)
{
return viewwidth+1;
}
else
{
double t = FIXED2DBL(finetangent[i]) * FocalLengthX;
return clamp(xs_CeilToInt(CenterX - t), -1, viewwidth+1);
}
double t = tan((i - FINEANGLES / 4)*pimul) * FocalLengthX;
return clamp(xs_CeilToInt(CenterX - t), -1, viewwidth+1);
}
//==========================================================================
@ -234,8 +236,6 @@ void R_InitTextureMapping ()
{
double f = atan2((FocalLengthX / (x - centerx)), 1) / (2*M_PI);
xtoviewangle[x] = ANGLE_270 + (angle_t)(0xffffffff * f);
//xtoviewangle[x] = ANGLE_270 + tantoangle[i];
}
for (x = 0; x < t1; ++x)
{