Nova's SDL Hack (AGA love)

[NovaCoder]

Originally Posted by tolkien

I have to look at more sdl sources but I dont understand how a thread can replace a timer.

Just start an SDL thread which will trigger a callback hook into your code. In your code you simply need to see if enough time has passed since the last time and then trigger your event if needed.

I think that's the basic idea anyway.

[NovaCoder]

Arti,

Here is a quick build of SDL v1.2.15 with my old AGA video code mixed in, haven't managed to test it yet but it should work OK with NetSurf AGA.

Threads and Timers are enabled in this build but not audio (same code as that v1.2.15 RTG I did for you).

Keyboard handling should also be better.


You should probably used these flags for NetSurf AGA (no point using DBL Buffer because NetSurf updates using dirty rectangles):

PHP Code:

flags = (SDL_FULLSCREEN|SDL_SWSURFACE|SDL_HWPALETTE); 


This build is for 040 (needs an FPU!)


Update:

Debug build uploaded...

[emufan]

can you please help to fix your latest SDL-AGA version,
there is a problem with missing SDL_SYS_JOYSTICK in the link library.
some older version from 2013 have this part, but latest on aminet is missing this.

[NovaCoder]

Originally Posted by emufan

can you please help to fix your latest SDL-AGA version,
there is a problem with missing SDL_SYS_JOYSTICK in the link library.
some older version from 2013 have this part, but latest on aminet is missing this.

Hiya,

Yes I remember taking out the joystick code but don't recall exactly why... maybe it was a bit buggy. I'm not doing any Amiga coding these days.

[emufan]

Originally Posted by NovaCoder

Hiya,

Yes I remember taking out the joystick code but don't recall exactly why... maybe it was a bit buggy. I'm not doing any Amiga coding these days.

oh, ok. extraction from older link lib went good, so lets see what happens

[NovaCoder]

Originally Posted by emufan

oh, ok. extraction from older link lib went good, so lets see what happens

Good luck, hope you can get it working

I should also warn you that the Threading and Timer implementation in all the 68k SDL builds is less than perfect (AFAIK). It's a shame I never got the chance to release a version that I was really happy with.

[emufan]

I do not say a shame - you did a lot with your ports for amigaland, despite the few resources we have.
maybe once you're in the right mood to continue where you stoped

[Marlon_]

Do you still have the sources for this lying around? I would like to add it to the Amiga68k-SDL repo on github and possibly add the option to switch between RTG and AGA during initialization and/or compile.

EDIT:

Nevermind, I suppose all that is needed is this file? amigaos_video_AGA.c

[NovaCoder]

Originally Posted by Marlon_

Do you still have the sources for this lying around? I would like to add it to the Amiga68k-SDL repo on github and possibly add the option to switch between RTG and AGA during initialization and/or compile.

EDIT:

Nevermind, I suppose all that is needed is this file? amigaos_video_AGA.c

Hi, yes that's the only file you need.

My old SDL v1.2.15 source code is in a complete mess with so many different AGA and CGX versions I don't know which one is the latest myself.

I will be working on a new 68k SDL for real Amiga's (pure AGA and RTG code with no Vampire extensions), just need to find the time.

The current AGA library on AmiNet is a bit of a hack, actually it's a great big hack and doesn't work properly

All of the 68k ports of SDL are a bit of a mess.

[jotd]

SDL is supposed to be portable and cross platform, but they just didn't anticipate planar display, which makes SDL slow as hell on a real Amiga (okay on Winuae, but what's the point)

[NovaCoder]

Originally Posted by jotd

SDL is supposed to be portable and cross platform, but they just didn't anticipate planar display, which makes SDL slow as hell on a real Amiga (okay on Winuae, but what's the point)

Not true!

Used to be true, but my release of SDL for AGA changed that

[ Show youtube player ]

[ Show youtube player ]

[Marlon_]

Originally Posted by NovaCoder

Hi, yes that's the only file you need.

My old SDL v1.2.15 source code is in a complete mess with so many different AGA and CGX versions I don't know which one is the latest myself.

I will be working on a new 68k SDL for real Amiga's (pure AGA and RTG code with no Vampire extensions), just need to find the time.

The current AGA library on AmiNet is a bit of a hack, actually it's a great big hack and doesn't work properly

All of the 68k ports of SDL are a bit of a mess.

The Vampire extension is only activated if the library finds the operators, so it's not really locked. I would like if you could do your work against our github and share. The file in that post links to header files not available in regular Amiga SDL RTG, so the file is a bit useless without the rest.

The plan I have with SDL for Amiga is to have a unified code-base for 68k, AROS, MorphOS, WarpOS and AmigaOS4 and clean it up in the process. I'll be happy for any help, as I am currently the only one working on this.

[NovaCoder]

That's a great plan my friend and quite ambitious so I wish you well.

I only have limited time for Amiga coding this days and prefer to do my own thing with my hobby.

Like I said above, my old AGA port is (yet another) SDL hack so I wouldn't even bother with 'amigaos_video_AGA.c'

[jotd]

@Novacoder it's really impressive. What are the specs of the A1200 you're using? and which compiler are you using?

this is serious stuff.

[NovaCoder]

Originally Posted by jotd

@Novacoder it's really impressive. What are the specs of the A1200 you're using? and which compiler are you using?

this is serious stuff.

Thanks man

Those videos were taken on my old 1260 running at 80Mhz and the ports were built with gcc v3.4

[jotd]

1260/80MHz !! I have 1260/50. That should work okay. The new gcc 6 looks impressive on 68k. It's completely windows native. I've used it and it's excellent.

I may give a go to your library. Can you explain what you "hacked" exactly? because AFAIR the bottleneck of SDL is chunky2pixel (again): writing in an abstract buffer then rendering into the real video memory.

[NovaCoder]

Originally Posted by jotd

1260/80MHz !! I have 1260/50. That should work okay. The new gcc 6 looks impressive on 68k. It's completely windows native. I've used it and it's excellent.

I may give a go to your library. Can you explain what you "hacked" exactly? because AFAIR the bottleneck of SDL is chunky2pixel (again): writing in an abstract buffer then rendering into the real video memory.

Yep that's a exactly what my version does, it the game writes to a chunky video buffer and then just uses C2P to update the display, it's nothing clever

[jotd]

nothing clever, I can't let you say that. That was clever to do what you did.

Why does it need AGA? because c2p to 8 bitplane is faster? what did the original port do to be so sluggish?

[NovaCoder]

It doesn't really need AGA, I also did an RTG version that just blitted directly to the screen without doing C2P.

I'm not sure why the original port was so slow?

ODAMEX RTG SDL

[NovaCoder]

I've been updating my old AGA SDL and trying to get RTG support working properly.

Can some people with real Amiga's try the attached application and see if it renders the colors properly at different color depths.

It's a very basic test application that has a single tooltype which you can use to choose if it runs in full screen or uses a window.

In theory it should render the included image in the correct colors on both big and small endian displays and in all color depths (8 bit results will obviously vary, depends on how many pens you free).

To quit the application you just hit any key (or close the window).

It is compiled for 030 + FPU because I was too lazy to compile it for soft FPU.

It uses the CyberGFX API but should work OK on P96 (maybe)

Seems to work OK using WinUAE