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Add alpha clamping so OpenGL conforms to Software's translucent levels

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This commit is contained in:
mazmazz 2018-08-17 16:27:32 -04:00
parent bf5efe6457
commit d94608fa10
3 changed files with 52 additions and 10 deletions
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2
src/p_saveg.c
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@ -1568,6 +1568,7 @@ static void SaveFadeThinker(const thinker_t *th, const UINT8 type)
WRITEUINT8(save_p, type);
WRITEINT32(save_p, ht->sectornum);
WRITEINT32(save_p, ht->ffloornum);
WRITEINT32(save_p, ht->alpha);
WRITEINT16(save_p, ht->destvalue);
WRITEINT16(save_p, ht->speed);
WRITEUINT8(save_p, ht->doexists);
@ -2571,6 +2572,7 @@ static inline void LoadFadeThinker(actionf_p1 thinker)
ht->thinker.function.acp1 = thinker;
ht->sectornum = READINT32(save_p);
ht->ffloornum = READINT32(save_p);
ht->alpha = READINT32(save_p);
ht->destvalue = READINT16(save_p);
ht->speed = READINT16(save_p);
ht->doexists = READUINT8(save_p);

59
src/p_spec.c
View file

@ -7212,16 +7212,23 @@ static boolean P_FadeFakeFloor(ffloor_t *rover, INT16 destvalue, INT16 speed,
boolean doexists, boolean dotranslucent, boolean docollision, boolean doghostfade, boolean exactalpha)
{
boolean stillfading = false;
INT32 alpha;
fade_t *fadingdata = (fade_t *)rover->fadingdata;
if (fadingdata)
alpha = fadingdata->alpha;
else
alpha = rover->alpha;
// routines specific to fade in and fade out
if (rover->alpha == destvalue)
if (alpha == destvalue)
return stillfading;
else if (rover->alpha > destvalue) // fade out
else if (alpha > destvalue) // fade out
{
// finish fading out
if (speed < 1 || rover->alpha - speed <= destvalue + speed)
if (speed < 1 || alpha - speed <= destvalue + speed)
{
rover->alpha = destvalue;
alpha = destvalue;
if (docollision)
{
@ -7237,16 +7244,16 @@ static boolean P_FadeFakeFloor(ffloor_t *rover, INT16 destvalue, INT16 speed,
}
else // continue fading out
{
rover->alpha -= speed;
alpha -= speed;
stillfading = true;
}
}
else // fade in
{
// finish fading in
if (speed < 1 || rover->alpha + speed >= destvalue - speed)
if (speed < 1 || alpha + speed >= destvalue - speed)
{
rover->alpha = destvalue;
alpha = destvalue;
if (docollision)
{
@ -7262,7 +7269,7 @@ static boolean P_FadeFakeFloor(ffloor_t *rover, INT16 destvalue, INT16 speed,
}
else // continue fading in
{
rover->alpha += speed;
alpha += speed;
stillfading = true;
}
}
@ -7272,7 +7279,7 @@ static boolean P_FadeFakeFloor(ffloor_t *rover, INT16 destvalue, INT16 speed,
{
if (doexists)
{
if (rover->alpha <= 1)
if (alpha <= 1)
rover->flags &= ~FF_EXISTS;
else
rover->flags |= FF_EXISTS;
@ -7280,7 +7287,7 @@ static boolean P_FadeFakeFloor(ffloor_t *rover, INT16 destvalue, INT16 speed,
if (dotranslucent)
{
if (rover->alpha >= 256)
if (alpha >= 256)
{
//rover->flags |= (FF_CUTLEVEL | FF_CUTEXTRA);
rover->flags &= ~FF_TRANSLUCENT;
@ -7330,6 +7337,37 @@ static boolean P_FadeFakeFloor(ffloor_t *rover, INT16 destvalue, INT16 speed,
}
}
if (!stillfading || exactalpha)
rover->alpha = alpha;
else // clamp fadingdata->alpha to software's alpha levels
{
if (alpha < 12)
rover->alpha = destvalue < 12 ? destvalue : 1; // Don't even draw it
else if (alpha < 38)
rover->alpha = destvalue >= 12 && destvalue < 38 ? destvalue : 25;
else if (alpha < 64)
rover->alpha = destvalue >=38 && destvalue < 64 ? destvalue : 51;
else if (alpha < 89)
rover->alpha = destvalue >= 64 && destvalue < 89 ? destvalue : 76;
else if (alpha < 115)
rover->alpha = destvalue >= 89 && destvalue < 115 ? destvalue : 102;
else if (alpha < 140)
rover->alpha = destvalue >= 115 && destvalue < 140 ? destvalue : 128;
else if (alpha < 166)
rover->alpha = destvalue >= 140 && destvalue < 166 ? destvalue : 154;
else if (alpha < 192)
rover->alpha = destvalue >= 166 && destvalue < 192 ? destvalue : 179;
else if (alpha < 217)
rover->alpha = destvalue >= 192 && destvalue < 217 ? destvalue : 204;
else if (alpha < 243)
rover->alpha = destvalue >= 217 && destvalue < 243 ? destvalue : 230;
else // Opaque
rover->alpha = destvalue >= 243 ? destvalue : 256;
}
if (fadingdata)
fadingdata->alpha = alpha;
return stillfading;
}
@ -7353,6 +7391,7 @@ static void P_AddFakeFloorFader(ffloor_t *rover, size_t sectornum, size_t ffloor
d->rover = rover;
d->sectornum = (INT32)sectornum;
d->ffloornum = (INT32)ffloornum;
d->alpha = rover->alpha;
d->destvalue = max(1, min(256, destvalue)); // ffloor->alpha is 1-256
d->speed = max(1, speed); // minimum speed 1/tic // if speed < 1, alpha is set immediately in thinker
d->doexists = doexists;

1
src/p_spec.h
View file

@ -456,6 +456,7 @@ typedef struct
ffloor_t *rover; ///< Target ffloor
INT32 sectornum; ///< Number of ffloor target sector
INT32 ffloornum; ///< Number of ffloor of target sector
INT32 alpha; ///< Internal alpha counter
INT16 destvalue; ///< Transparency value to fade to
INT16 speed; ///< Speed to fade by
boolean doexists; ///< Handle FF_EXISTS