Mode3 problem with my lib

[alekmaul]

Hi all,
I'm trying to use standard mode 3( not DC direct), and I have a strange feature.
The result is OK with no$sns and zsnes but KO with bsnes 0.88. It's also KO on my SNES so I think bsnes is right with its features.
The source code is in snes-sample, from mode3 example.
I'm trying to debugging with no$sns but i really can't find why it's KO.
Here are screenshots :


Mode3 is the only mode that does not works. All works fine with mode0,1 and 7 (no test of other modes currently ...).

And link to sfc file :
http://www.portabledev.com/media/SNES/P ... /Mode3.sfc

Does anyone has an idea where I can investigate to know what is wrong with the lib ?

[Jsolo]

You're performing a DMA during VBlank that lasts until scanline 12; as your screen is enabled, any VRAM write is blocked by hardware on the pre render scanline.
If you want to transfer whole char- or tilemaps, you should do that during forced blank.

[alekmaul]

Hi Jsolo,
You were absolutely right

I changed my init tileset function bgInitTileSet with :

setBrightness(0); // Force VBlank Interrupt
WaitForVBlank();

// Send to VRAM and CGRAM
dmaCopyVram(tileSource, address, tileSize);
dmaCopyCGram(tilePalette, palEntry, paletteSize);
bgSetGfxPtr(bgNumber, address);

And now, it's correct on bsnes and my "not so real snes" Supaboy console !

Thanks a lot !

By the way, nocash, it means that no$sns 1.2 has problem with such checking of VBlank.