During `ReencodeDungeonCels`, extracts floor tile foliage into
a triangle with the floor frame and a separate 16-px tall `TransparentSquare`.
This means that the floor frames are now always triangles and
the foliage can be rendered directly without masking.
Dungeon graphics sizes:
Map | Frames | Foliage frames | Byte size | Before PR | After PR
-----|--------|---------------:|-----------:|----------:|----------:
Town | 3,803 | 41 | 2,317,832 | 2,242,056 | 2,242,190
L1 | 1,119 | 11 | 738,836 | 721,604 | 721,110
L4 | 1,091 | 6 | 603,140 | 584,500 | 584,242
RG99 binary size reduced by ~4 KiB: 2,426,380 bytes -> 2,421,388 bytes
We notice that masks can be described by 2 parameters:
1. Whether they have 0 or 1 as their high bits.
2. Whether they shift to the left or to the right on the next line.
Describing masks this way allows us to lift them to template variables and simplify the code.
We also avoid handling the mask in the `RenderLine` loop entirely.
Also fixes a foliage rendering bug: Transparent foliage pixels were previously blended but they should have been simply skipped.
This is part of the work to allow us to eliminate buffer padding.
As this is a hotspot, we have 4 separate functions for each non-square
primitive, resulting in quite a bit of code:
1. Unclipped ("Full")
2. Vertical-only clip
3. Vertical + Left clip
4. Vertical + Right clip
FPS at 640x480: 1420 -> 1530
This require calling DRLG_InitTrans() during CreateTown() to clear out
the transparancy flags after having been to the duntion. Else the
mausoleum will be transparent.
Stephen C. Wills
Gleb Mazovetskiy
qndel
Anders Jenbo
Juliano Leal Goncalves
thebigMuh
Joel Falcou
galaxyhaxz
aperturesecurity
galaxyhaxz
mewmew