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Add a new aligned mode to alphatabs by defining numalphatabs to be a power of two minus one.

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This provides fractionally better correspondence between 0-255 alpha values and blend table IDs.

git-svn-id: https://svn.eduke32.com/eduke32@5890 1a8010ca-5511-0410-912e-c29ae57300e0
This commit is contained in:
hendricks266 2016-10-14 07:40:32 +00:00
parent 9906b71023
commit 5381e729f8
2 changed files with 6 additions and 4 deletions
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8
polymer/eduke32/build/src/defs.c
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@ -3504,11 +3504,12 @@ static int32_t defsparser(scriptfile *script)
switch (value) switch (value)
{ {
case 0: /*case 1:*/ case 2: case 4: case 8: case 16: case 32: case 64: case 128: case 1: case 3: case 7: case 15: case 31: case 63: case 127:
case 2: case 4: case 8: case 16: case 32: case 64: case 128:
#ifdef USE_OPENGL #ifdef USE_OPENGL
for (int32_t a = 1, value2 = value*2; a <= value; ++a) for (int32_t a = 1, value2 = value*2 + (value&1); a <= value; ++a)
{ {
float finv2value = 0.5f/(float)value; float finv2value = 1.f/(float)value2;
glblend_t * const glb = glblend + a; glblend_t * const glb = glblend + a;
*glb = defaultglblend; *glb = defaultglblend;
@ -3516,6 +3517,7 @@ static int32_t defsparser(scriptfile *script)
glb->def[1].alpha = (float)a * finv2value; glb->def[1].alpha = (float)a * finv2value;
} }
#endif #endif
case 0:
numalphatabs = value; numalphatabs = value;
break; break;
default: default:

2
polymer/eduke32/build/src/engine.c
View file

@ -4725,7 +4725,7 @@ static size_t falpha_to_blend(float alpha, int32_t *cstatptr, uint8_t *blendptr,
{ {
int32_t cstat = *cstatptr | transbit1; int32_t cstat = *cstatptr | transbit1;
int32_t const twonumalphatabs = 2*numalphatabs; int32_t const twonumalphatabs = 2*numalphatabs + (numalphatabs&1);
int32_t blendidx = Blrintf(alpha * twonumalphatabs); int32_t blendidx = Blrintf(alpha * twonumalphatabs);
if (blendidx > numalphatabs) if (blendidx > numalphatabs)
{ {