User:Monster Iestyn/Translucency
Main
- Sprite translucency: Console/Variables#translucency; see also State#Attributes
MF2_SHADOW(see Object flags#Object flags 2)
- Linedef types#Translucent walls
- FOF translucency:
FF_TRANSLUCENT(e.g Linedef type 102) - PolyObject translucency: Linedef type 491
- HUD translucency: Console/Variables#translucenthud; see also Video flags#Alpha
Alpha values
In software mode, SRB2 sometimes has to convert from an 8-bit "alpha" value to an approximate transmap. In OpenGL the reverse often occurs instead.
Translucent FOF alpha to transmap conversion table
Source:
R_RenderThickSideRangefromr_segs.cR_DrawSinglePlanefromr_plane.c
| Alpha values | Transmap |
|---|---|
#000-#011
|
Invisible |
#012-#037
|
tr_trans90 |
#038-#063
|
tr_trans80 |
#064-#088
|
tr_trans70 |
#089-#114
|
tr_trans60 |
#115-#139
|
tr_trans50 |
#140-#165
|
tr_trans40 |
#166-#191
|
tr_trans30 |
#192-#216
|
tr_trans20 |
#217-#242
|
tr_trans10 |
#243-#255
|
Opaque (turns cyan pixels on flats transparent) |
OpenGL transmap to alpha conversion table
Source: HWR_TranstableToAlpha from hw_main.c
| Transmap | Alpha (Decimal) | Alpha (Hexadecimal) |
|---|---|---|
| tr_trans10 | 230 | 0xe6
|
| tr_trans20 | 204 | 0xcc
|
| tr_trans30 | 179 | 0xb3
|
| tr_trans40 | 153 | 0x99
|
| tr_trans50 | 128 | 0x80
|
| tr_trans60 | 102 | 0x66
|
| tr_trans70 | 76 | 0x4c
|
| tr_trans80 | 51 | 0x33
|
| tr_trans90 | 25 | 0x19
|