4 bit texture bug

[Bart]

"L.A. Machineguns: Rise of the Machines", shouldn't be it called "L.A. Machineguns: Rage of the Machines"?

Good catch! Fixed.

[Ian]

Hopefully that commit didn't break any other games!

I tested some games using those type 8-11 textures (1-4 with contour) and all seem fine

I would suggest just to change the way their alpha channel is interpreted; now is always inverted being 1 or 0, however since they're luminance texture they should blend more smoothly. So you could either change in <texture.cpp>, for texture 8-11:

Code: Select all

scratch[i++] = 255 - c;


or pass "currentMesh->format" as uniform to the fragment shader and fetch that value to make the inversion. I was checking LA Machineguns attract demo and at least type 8 is used in buildings glasses, which are alpha blended.

Are you saying the alpha is inverted too?

[HarryTuttle]

Compile with DEBUG defined (add -DDEBUG to command line parameters and rebuild from scratch) and then:

1. Make a directory called Analysis.
2. Run: supermodel roms\dayto2pe.zip -gfx-state=saves\dayto2pe.st0

You specify a ROM set and a save state file. It'll then write a bunch of files to Analysis/ and you can open up the html file it produces there

Bart, maybe I missed something but:

- compiling with -DDEBUG means that I've also to enable the internal debugger in Supermodel? Because not doing so it won't compile;
- as soon as I run a game specifying also a save state the emulator exits immediately without doing anything and not throwing any error message to the console;

UPDATE:
after r576 it won't compile at all saying:

Code: Select all

Compiling Src/OSD/SDL/Main.cpp...
Src/OSD/SDL/Main.cpp: In function 'void TestPolygonHeaderBits(IEmulator*)':
Src/OSD/SDL/Main.cpp:468:24: error: variable 'std::ofstream fs' has initializer but incomplete type
   std::ofstream fs(file);
                        ^


[HarryTuttle]

Are you saying the alpha is inverted too?

For texture 8-11 yes, always, no matter what translator map offset's value is

[Ian]

So the middle part of this is supposed to be transparent ?

[HarryTuttle]

It should be as it reveals the underlying polygon color, I'm referring to Daytona 2 cars' decals. In that case it's the polygon that "colorize" the numbers.

[Ian]

some pics would help

[HarryTuttle]

Inverted:

du2_04.jpeg (216.41 KiB) Viewed 8411 times

Not inverted:

du2_05.jpeg (216.76 KiB) Viewed 8411 times

Please note, however, that your current solution is fine, I've made myself a bit unclear before, I just meant to not set alpha to 0 or 1, but reuse the same "c" value (used for r,g,b) to also alpha channel, but inverted.

[Ian]

Yeah that's interesting ..
I hadn't tried battle on the edge
It looks quite broken. Maybe there is an alpha inversion bit?

[HarryTuttle]

Wait... mine is fine!

du2_06.jpeg (213.3 KiB) Viewed 8404 times