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In 8-bit, change the precedence of .alpha and .blend. 

Previously: Non-zero alpha stacked with cstat translucency in an imitation of Polymost, potentially clobbering .blend if alphatabs are used.
Now: If cstat translucency is active, .alpha is ignored.

git-svn-id: https://svn.eduke32.com/eduke32@5887 1a8010ca-5511-0410-912e-c29ae57300e0
This commit is contained in:
hendricks266 2016-10-09 07:55:18 +00:00
parent 4d08f4d433
commit 2025aab189
1 changed files with 11 additions and 19 deletions
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30
polymer/eduke32/build/src/engine.c
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@ -4724,13 +4724,7 @@ static void setup_globals_sprite1(const uspritetype *tspr, const usectortype *se
static uint8_t falpha_to_blend(float alpha, int32_t *cstatptr, int32_t transbit1, int32_t transbit2)
{
int32_t cstat = *cstatptr;
if (cstat&transbit1)
alpha = 1.0f - (1.0f - alpha) * ((cstat&transbit2) ? (1.f/3.f) : (2.f/3.f));
cstat |= transbit1;
cstat &= ~transbit2;
int32_t cstat = *cstatptr | transbit1;
int32_t blendidx = max(1, Blrintf(alpha * (2*numalphatabs))); // [1 .. 2*numalphatabs-1]
if (blendidx > numalphatabs)
@ -4738,6 +4732,10 @@ static uint8_t falpha_to_blend(float alpha, int32_t *cstatptr, int32_t transbit1
blendidx = 2*numalphatabs - blendidx;
cstat |= transbit2;
}
else
{
cstat &= ~transbit2;
}
// blendidx now in [1 .. numalphatabs]
*cstatptr = cstat;
@ -4776,7 +4774,7 @@ static void drawsprite_classic(int32_t snum)
DO_TILE_ANIM(tspr->picnum, spritenum+32768);
if (alpha > 0.0f)
if (!(cstat&2) && alpha > 0.0f)
{
if (alpha >= 1.0f)
return;
@ -4787,15 +4785,12 @@ static void drawsprite_classic(int32_t snum)
}
else if (alpha >= 1.f/3.f)
{
cstat &= ~512;
if ((cstat&2) && alpha >= 0.5f) // this covers the multiplicative aspect used in the Polymodes
cstat |= 512;
cstat |= 2;
if (alpha >= 2.f/3.f)
cstat |= 512;
else
cstat &= ~512;
}
tspr->cstat = cstat;
@ -6624,7 +6619,7 @@ static void dorotatesprite(int32_t sx, int32_t sy, int32_t z, int16_t a, int16_t
palookupoffs = FP_OFF(palookup[dapalnum]) + (getpalookup(0, dashade)<<8);
// Alpha handling
if (daalpha > 0)
if (!(dastat&RS_TRANS1) && daalpha > 0)
{
if (daalpha == 255)
return;
@ -6635,15 +6630,12 @@ static void dorotatesprite(int32_t sx, int32_t sy, int32_t z, int16_t a, int16_t
}
else if (daalpha > 84)
{
dastat &= ~RS_TRANS2;
if ((dastat & RS_TRANS1) && daalpha > 127) // this covers the multiplicative aspect used in the Polymodes
dastat |= RS_TRANS2;
dastat |= RS_TRANS1;
if (daalpha > 168)
dastat |= RS_TRANS2;
else
dastat &= ~RS_TRANS2;
}
}