Homebrew Emulation GameYob, a gameboy emulator for DS

[sverx]

The reason the copying is necessary is because the sub engine can only use one of the 128k vram banks, bank C. I can't switch it out... the bank which is taking the snapshot needs to be allocated to the LCD memory area. The best I could do, without copying, was to have it displaying at 30 fps, with every other frame being black. No good. So the snapshot is captured to bank D, and every vblank, the contents of D are copied to C. I don't need to copy all of it, just 256x144x2 bytes (or possibly 160x144x2 noncontinuous bytes), but that's still a lot.

You really made me worry about being completely gone crazy... no, actually the fact is that you have to use bank C and background on odd frames and bank D and bitmap objects (sprites! really!!!) on even frames. What I'm not sure now is if rotscale double bitmap objects exist or not... I've never used them but it should be theoretically possible (ATTR0_ROTSCALE_DOUBLE|ATTR0_BMP).
So you'll have to break up the captured image into sprites and resize them. Not easy. Also, you have to make sure you're using the proper "Bitmap OBJ Mapping (DISPCNT.6,5,22)"

I believe it's easier to resize backgrounds and sprites directly on main engine and forget capture

 

[Drenn]

I believe it's easier to resize backgrounds and sprites directly on main engine and forget capture

If there's a way to do that I'd love to know how. I'm under the impression that tile-based background layers are unscaleable.

You really made me worry about being completely gone crazy... no, actually the fact is that you have to use bank C and background on odd frames and bank D and bitmap objects (sprites! really!!!) on even frames. What I'm not sure now is if rotscale double bitmap objects exist or not... I've never used them but it should be theoretically possible (ATTR0_ROTSCALE_DOUBLE|ATTR0_BMP).
So you'll have to break up the captured image into sprites and resize them. Not easy. Also, you have to make sure you're using the proper "Bitmap OBJ Mapping (DISPCNT.6,5,22)"

Bitmap sprites, well that hadn't even occurred to me! Scaling them in the same manner as the background certainly sounds like a complex task... I'm wondering how a filter would work this way. Can sprites be blended with themselves...?

Anyway. The scaling I have is finally fairly usable, so, you can try it out using the master branch latest build. There are 2 filters, neither of which is particularly great. I'd recommend using filter B.

THe only thing that keeps me back on lameboy compared to this awesome emulator is the damn scaling the lameboy has
If it ever gets implemented i will surely go with this one.

No excuse to use lameboy anymore

 

[dickfour]

I'm using an XL so there's no need for scaling
I just went back and tried Lameboy and it's not even close. Scaling or not I'd never use it again. There's just no reason

 

[StruttingPhil]

http://gbatemp.net/threads/how-to-manually-create-gameyob-cheat-files.346904/ . Read this if you need help with makin Cheat Code files

 

[dickfour]

Wow scaling! That was quick. Everything seems to work well. Nice job.

 

[StruttingPhil]

_

 

[StruttingPhil]

In case people are having trouble with finding the DropBox link: dl.dropbox.com/u/100702766/gameyob/gameyob.nds

 

[wzhy90]

If there's a way to do that I'd love to know how. I'm under the impression that tile-based background layers are unscaleable.


Bitmap sprites, well that hadn't even occurred to me! Scaling them in the same manner as the background certainly sounds like a complex task... I'm wondering how a filter would work this way. Can sprites be blended with themselves...?

Anyway. The scaling I have is finally fairly usable, so, you can try it out using the master branch latest build. There are 2 filters, neither of which is particularly great. I'd recommend using filter B.


No excuse to use lameboy anymore

I have cloned the source, and I want to translate it to chinese. how can I add a chinese font in source?

 

[sverx]

Bitmap sprites, well that hadn't even occurred to me! Scaling them in the same manner as the background certainly sounds like a complex task... I'm wondering how a filter would work this way. Can sprites be blended with themselves...?

Oh, right, you wanted to hardware blend and jitter the image to 'filter' it. No, unfortunately there's no sprite-to-sprite blending. This makes this whole bitmap objects thing unfeasible.

If there's a way to do that I'd love to know how. I'm under the impression that tile-based background layers are unscaleable.

Tile based backgrounds CAN be scaled and rotated. On DS you've even got extended rotscale backgrounds, which supports up to 1024 tiles that can be even flipped (as in regular text BGs). But, again, if you scale also the sprites you won't have any blending filter there. So maybe you've found the right compromise, capturing the rendered MAIN screen to vram D and copying contents to vram C each frame for a 15bpp bitmap background on SUB screen, where you can have BG2 and BG3 (both using the same image) hardware blending and jittering them... well, not bad

 

[wzhy90]

where is the emu save game?
I run Zelda and creat a save, but i cant find any .sav files in my sd card

 

[dickfour]

where is the emu save game?
I run Zelda and creat a save, but i cant find any .sav files in my sd card

That's odd, I was able to generate a Zelda sav file

 

[dickfour]

i found a bug Super RC pro Am racing works on an older version but doesn't launch on the latest build

 

[Aeter]

I found quite a lot of cheat files for GB and GBC, perhaps all:
GB .CHT Files
GBC .CHT Files

They're in the BGB cheat format which appears to be the exact format GameYob uses according to StruttingPhil.

 

[Coto]

Oh, right, you wanted to hardware blend and jitter the image to 'filter' it. No, unfortunately there's no sprite-to-sprite blending. This makes this whole bitmap objects thing unfeasible.

Tile based backgrounds CAN be scaled and rotated. On DS you've even got extended rotscale backgrounds, which supports up to 1024 tiles that can be even flipped (as in regular text BGs). But, again, if you scale also the sprites you won't have any blending filter there. So maybe you've found the right compromise, capturing the rendered MAIN screen to vram D and copying contents to vram C each frame for a 15bpp bitmap background on SUB screen, where you can have BG2 and BG3 (both using the same image) hardware blending and jittering them... well, not bad

I'm interested in this, about rotscale backgrounds. If you use them, the 2D engine is "busy" to perform another hw operation at the same time? Or is that part of the 3D engine?

 

[Geren]

where is the emu save game?
I run Zelda and creat a save, but i cant find any .sav files in my sd card

Whenever you save in a game, you must press the X button to save sram. It's the same as lameboy.

 

[pyrofool]

I noticed if there is an in game save from the game its self and you hit the reset option, when the game resets it does not reload the saved data. When you exit and load the game again, the save shows up. Maybe the reset function does not directly mirror the load game function.

 

[sverx]

I'm interested in this, about rotscale backgrounds. If you use them, the 2D engine is "busy" to perform another hw operation at the same time? Or is that part of the 3D engine?

'Tiled' backgrounds on DS can be of 3 types: 'normal', 'rotscale' (aka 'affine') and 'extended rotscale'. You can have 4 'normal' -OR- 3 'normal' and 1 of the other 2 kinds -OR- 2 normal and 2 of the other 2 kinds. Check BG modes here. All that is generated by the 2D core. Better: all that is possible on both 2D cores of the DS

 

[Sizednochi]

EDIT: I made more because why not
I made a small contribution for anyone using custom borders, you can download them here:

Purple: http://www.mediafire.com/?yaw5c29jl5j7mb9
Teal: http://www.mediafire.com/?i8r4innwuy1qrzn
Dandelion (Yellow): http://www.mediafire.com/?uu50vx55r57bqoz
Blue: http://www.mediafire.com/?g3zac8gmg6dv66c
Kiwi (Light Green): http://www.mediafire.com/?qn5vicp6svyec5u
Berry (Fuchsia): http://www.mediafire.com/?fghp12j3fea3rfw
Atomic Purple: http://www.mediafire.com/?gvarybah37n9w5x

Pikachu Edition: http://www.mediafire.com/?l7yu8871h9v20u0
Pokémon Center Limited Edition: http://www.mediafire.com/?0m3pxad16qj13rf

Previews:

Spoiler

​

​

PS.: You have to rename the one you want to border.bmp and place it on the Root of your SD, as of now you can't select individual borders.​

 

[Coto]

'Tiled' backgrounds on DS can be of 3 types: 'normal', 'rotscale' (aka 'affine') and 'extended rotscale'. You can have 4 'normal' -OR- 3 'normal' and 1 of the other 2 kinds -OR- 2 normal and 2 of the other 2 kinds. Check BG modes here. All that is generated by the 2D core. Better: all that is possible on both 2D cores of the DS

Many thanks for the info given sverx

 

[Drenn]

I have cloned the source, and I want to translate it to chinese. how can I add a chinese font in source?

You'd have to replace consoleDemoInit calls with consoleInit calls (see here), and copy your font to the sub graphics engine. Maybe use the implementation of consoleDemoInit() in libnds as a guideline? I've never used a font other than the default myself.

EDIT: I made more because why not
I made a small contribution for anyone using custom borders, you can download them here:

Purple: http://www.mediafire.com/?yaw5c29jl5j7mb9
Teal: http://www.mediafire.com/?i8r4innwuy1qrzn
Dandelion (Yellow): http://www.mediafire.com/?uu50vx55r57bqoz
Blue: http://www.mediafire.com/?g3zac8gmg6dv66c
Kiwi (Light Green): http://www.mediafire.com/?qn5vicp6svyec5u
Berry (Fuchsia): http://www.mediafire.com/?fghp12j3fea3rfw
Atomic Purple: http://www.mediafire.com/?gvarybah37n9w5x
Pikachu Edition: http://www.mediafire.com/?l7yu8871h9v20u0

Previews:

Spoiler

PS.: You have to rename the one you want to border.bmp and place it on the Root of your SD, as of now you can't select individual borders.

Nice When I make a new stable release I'll link to these in the first post, if you don't mind.