Rooba
/
ReC98
mirror of https://github.com/nmlgc/ReC98.git
1
1
Fork 0
Code Issues Packages Projects Releases Wiki Activity

[Maintenance] [th01] .PTN: Define the transparent color in a single place 

Inlined template functions! \o/

Part of P0096, funded by Ember2528.
This commit is contained in:
nmlgc 2020-06-06 23:28:03 +02:00
parent 9cd54f1b13
commit 979f401515
2 changed files with 17 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
th01/formats/ptn.cpp
View File

@ -57,15 +57,11 @@ ptn_error_t ptn_load_palette_show(int slot, const char *fn)
arc_file_get(ptn->unused_zero);
arc_file_get(ptn->planes);
for(y = 0; y < PTN_H; y++) {
// Color #15 (1111) is always the transparent one, meaning that
// transparent dots are 1 in all 4 bitplanes. The alpha mask
// therefore simply is the negation of ANDing all bitplanes
// together. Nifty!
ptn->alpha[y] = ~(
ptn->planes.B[y]
& ptn->planes.R[y]
& ptn->planes.G[y]
& ptn->planes.E[y]
ptn->alpha[y] = ptn_alpha_from(
ptn->planes.B[y],
ptn->planes.R[y],
ptn->planes.G[y],
ptn->planes.E[y]
);
}
}

12
th01/formats/ptn.hpp
View File

@ -5,6 +5,18 @@
/// color #15. Can also be used to store the backgrounds of frequently updated
/// VRAM regions, using the functions for raw allocation and VRAM snapping.
}
// Color #15 (1111) is always the transparent one, meaning that transparent
// dots are 1 in all 4 bitplanes. The alpha mask therefore simply is the
// negation of ANDing all bitplanes together. Nifty!
template <class T> inline T ptn_alpha_from(T B, T R, T G, T E)
{
return ~((B) & (R) & (G) & (E));
}
extern "C" {
#define PTN_W 32
#define PTN_H 32