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Rigor-up the handling of 0% and 100% alpha with alphatabs in 8-bit.

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git-svn-id: https://svn.eduke32.com/eduke32@5889 1a8010ca-5511-0410-912e-c29ae57300e0
This commit is contained in:
hendricks266 2016-10-14 07:33:30 +00:00
parent 8a1f1f2ede
commit 9906b71023
1 changed files with 14 additions and 7 deletions
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21
polymer/eduke32/build/src/engine.c
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@ -4721,25 +4721,30 @@ static void setup_globals_sprite1(const uspritetype *tspr, const usectortype *se
// drawsprite (internal)
//
static uint8_t falpha_to_blend(float alpha, int32_t *cstatptr, int32_t transbit1, int32_t transbit2)
static size_t falpha_to_blend(float alpha, int32_t *cstatptr, uint8_t *blendptr, int32_t transbit1, int32_t transbit2)
{
int32_t cstat = *cstatptr | transbit1;
int32_t blendidx = max(1, Blrintf(alpha * (2*numalphatabs))); // [1 .. 2*numalphatabs-1]
int32_t const twonumalphatabs = 2*numalphatabs;
int32_t blendidx = Blrintf(alpha * twonumalphatabs);
if (blendidx > numalphatabs)
{
blendidx = 2*numalphatabs - blendidx;
blendidx = twonumalphatabs - blendidx;
cstat |= transbit2;
}
else
{
cstat &= ~transbit2;
}
if (blendidx < 1)
return cstat&transbit2;
// blendidx now in [1 .. numalphatabs]
*cstatptr = cstat;
return blendidx;
*blendptr = blendidx;
return 0;
}
FORCE_INLINE int32_t mulscale_triple30(int32_t a, int32_t b, int32_t c)
@ -4781,7 +4786,8 @@ static void drawsprite_classic(int32_t snum)
if (numalphatabs != 0)
{
blendidx = falpha_to_blend(alpha, &cstat, 2, 512);
if (falpha_to_blend(alpha, &cstat, &blendidx, 2, 512))
return;
}
else if (alpha >= 1.f/3.f)
{
@ -6626,7 +6632,8 @@ static void dorotatesprite(int32_t sx, int32_t sy, int32_t z, int16_t a, int16_t
if (numalphatabs != 0)
{
dablend = falpha_to_blend((float)daalpha / 255.0f, &dastat, RS_TRANS1, RS_TRANS2);
if (falpha_to_blend((float)daalpha / 255.0f, &dastat, &dablend, RS_TRANS1, RS_TRANS2))
return;
}
else if (daalpha > 84)
{