Search found 316 matches

by tryphon
Wed Apr 22, 2020 8:38 am
Forum: SGDK
Topic: Problem with DMA_doVramFill
Replies: 5
Views: 952

Re: Problem with DMA_doVramFill

Because I sometimes do not need to write the upper byte :)

But I wrote a macro doing both write ;)

(I'm never sure when a function is inlined, so I guess macros are faster)
by tryphon
Tue Apr 21, 2020 11:02 pm
Forum: SGDK
Topic: Problem with DMA_doVramFill
Replies: 5
Views: 952

Re: Problem with DMA_doVramFill

OK, I think I understood the problem. I looked in source code of DMA_doVRamFill. In fact, the "value" parameter needs to be u8. Then, when sending the value to data port, you write : *pw = value | (value << 8); because the 1st word write sends the lower byte to adress, the upper byte to adjacent adr...
by tryphon
Tue Apr 21, 2020 1:33 pm
Forum: SGDK
Topic: Problem with DMA_doVramFill
Replies: 5
Views: 952

Problem with DMA_doVramFill

I have a problem with DMA_doVRamFill. My plane A starts at VRAM adress 0xC000 with : 0xC000 : 2108 2108 2108 2108 2108 2108 2108 2108 2108 2108 (2108 means : tile 0x108 with palette 1, no priority, no flips) (If I'm not mistaken, VRAM is little-endian so it should be 08 21 inside). I want to change ...
by tryphon
Thu Apr 16, 2020 7:33 pm
Forum: SGDK
Topic: HScroll Tile mode
Replies: 11
Views: 1424

Re: HScroll Tile mode

Image

(image attachment doesn't seem to work : it's the second boss of Shinobi arcade ;) )
by tryphon
Wed Apr 15, 2020 11:56 am
Forum: SGDK
Topic: HScroll Tile mode
Replies: 11
Views: 1424

Re: HScroll Tile mode

Thank you, it seems to work like a charm :)

Get ready Black Turtle !
by tryphon
Tue Apr 14, 2020 3:59 pm
Forum: SGDK
Topic: HScroll Tile mode
Replies: 11
Views: 1424

Re: HScroll Tile mode

Thanks :)

But don't I need to disable HInt at the end of my_callback() ?

If I don't do it, won't HInt be triggered at every line after scanline ?
by tryphon
Tue Apr 14, 2020 11:03 am
Forum: SGDK
Topic: HScroll Tile mode
Replies: 11
Views: 1424

Re: HScroll Tile mode

Thanks, you confirm what I thought :) So, is this the way to do it : 1) just after VBlank, I set register 10 with the (scanline - 1) and enable HInt (with a custom callback function) : VDP_setReg(10, scanline - 1); SYS_setHIntCallback(my_callback) SYS_setInterruptMaskLevel(4); 2) the callback functi...
by tryphon
Tue Apr 14, 2020 8:59 am
Forum: SGDK
Topic: HScroll Tile mode
Replies: 11
Views: 1424

Re: HScroll Tile mode

I also was wondering something : I want to simulate parallax scrolling in one plane : lines above line 448 of the map must scroll at half-speed, lines below at full speed. There can be vertical scroll, so line 448 of the map is not always at the same screen height (let's call scanline the correspond...
by tryphon
Mon Apr 13, 2020 6:03 pm
Forum: SGDK
Topic: HScroll Tile mode
Replies: 11
Views: 1424

HScroll Tile mode

Hello, I want to use Horizontal scrolling per tile mode, and I see I shuld use : VDP_setHorizontalScrollTile(VDPPlane plane, u16 tile, s16* values, u16 len, TransferMethod tm); I read that TransferMethod tm can be : * Transfer method.<br> * Accepted values are:<br> * - CPU<br> * - DMA<br> * - DMA_QU...
by tryphon
Wed Dec 25, 2019 10:01 am
Forum: Megadrive/Genesis
Topic: Shinobi arcade port
Replies: 3
Views: 2869

Shinobi arcade port

I think I never talked about my project here, which is a shame since this forum got me the most valuable advices about Megadrive programming. I've started some years ago a port of the 1987 Shinobi arcade game on Megadrive. Back in the days I was in love with this game, and I thought it was really sa...
by tryphon
Fri Oct 25, 2019 1:53 pm
Forum: SGDK
Topic: [XGM] PCM sfx doesn't start
Replies: 3
Views: 2982

Re: [XGM] PCM sfx doesn't start

Yes we did, and you're right, that's indeed the problem. At first I thought I had a priority problem, then that isPlayingPCM was releasing info too early, but it's the contrary : it takes too much time to consider the channel used. I'll update my "pcm manager" to block a channel during the 2 first f...
by tryphon
Thu Oct 24, 2019 8:06 pm
Forum: SGDK
Topic: [XGM] PCM sfx doesn't start
Replies: 3
Views: 2982

Re: [XGM] PCM sfx doesn't start

After some texts, I think the problem is related to XGM_isPCMPlaying...
by tryphon
Thu Oct 24, 2019 5:32 pm
Forum: SGDK
Topic: [XGM] PCM sfx doesn't start
Replies: 3
Views: 2982

[XGM] PCM sfx doesn't start

I noticed sometimes, PCM sfx doesn't start when I call XGM_playPCM. Especially when I play very close sfx. Therefore I have the 3 questions : 1) is the priority the only thing that can prevent a PCM to be played ? 2) does a priority of 15 mean that the PCM will overpass any playing PCM (so it can't ...
by tryphon
Wed Aug 28, 2019 1:28 pm
Forum: Megadrive/Genesis
Topic: Sega Tech Docs archive
Replies: 26
Views: 16884

Re: Sega Tech Docs archive

Huge move. Thank you all for gathering this...
by tryphon
Wed Jul 24, 2019 3:30 pm
Forum: SGDK
Topic: SGDK1.4 crashes at compilation
Replies: 4
Views: 3191

Re: SGDK1.4 crashes at compilation

Mmmh, I'll try to compile in my fridge and keep you informed :P