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Polymodes: properly calc start/end fog dist for r_usenewshading=2, vis=0, shade>0 

So there's no "jump" from vis!=0 to vis=0 making the texture appear brighter.

git-svn-id: https://svn.eduke32.com/eduke32@3959 1a8010ca-5511-0410-912e-c29ae57300e0
This commit is contained in:
helixhorned 2013-07-18 18:08:10 +00:00
parent ec2514a91d
commit 66d126e9ff
1 changed files with 17 additions and 4 deletions
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21
polymer/eduke32/build/src/polymost.c
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@ -519,8 +519,8 @@ static void fogcalc_old(int32_t shade, int32_t vis)
// For GL_LINEAR fog:
#define FOGDISTCONST 600
#define FULLVIS_BEGIN 2.9e38
#define FULLVIS_END 3.0e38
#define FULLVIS_BEGIN 2.9e30
#define FULLVIS_END 3.0e30
static inline void fogcalc(int32_t tile, int32_t shade, int32_t vis, int32_t pal)
{
@ -541,8 +541,19 @@ static inline void fogcalc(int32_t tile, int32_t shade, int32_t vis, int32_t pal
if (combvis == 0)
{
fogresult = FULLVIS_BEGIN;
fogresult2 = FULLVIS_END;
if (shade > 0)
{
// beg = -D*shade, end = D*(NUMSHADES-1-shade)
// => end/beg = -(NUMSHADES-1-shade)/shade
fogresult = -FULLVIS_BEGIN;
fogresult2 = FULLVIS_BEGIN * (float)(numshades-1-shade)/shade;
}
else
{
fogresult = FULLVIS_BEGIN;
fogresult2 = FULLVIS_END;
}
return;
}
@ -574,6 +585,8 @@ void calc_and_apply_fog_factor(int32_t tile, int32_t shade, int32_t vis, int32_t
if (nofog)
return;
// NOTE: for r_usenewshading==2, the fog being/ending distance results are
// unused.
fogcalc(tile, shade, vis, pal);
bglFogfv(GL_FOG_COLOR, fogcol);