(AGA) what's this? - Page 2

britelite · 09 July 2018, 13:34

Quote:

Originally Posted by coder76

It's not possible to run 640x480 with 256 colors and 60 Hz on a standard ISA bus.

You do know that there are ISA SVGA-cards available, right? The speed of the ISA bus has nothing to do with resolution or bitdepth, only how fast the CPU can copy stuff to the VRAM. So yeah, it might not be comfortable to use 640x480x256c through an ISA-bus, but it's possible.

BullyDog · 09 July 2018, 14:13

Quote:

Originally Posted by chip

Yep you are right Amiga4000

I thinked BullyDog uses WinUAE but i can't know that

I'm using Damien's front end but I use C64/Amiga Forever too and they both have WinUAE.

I ran AGA games without making a switch and it seemed to ran ok. Maybe it ran with reduced graphics I don't know.

DamienD · 09 July 2018, 14:26

Quote:

Originally Posted by BullyDog

I ran AGA games without making a switch and it seemed to ran ok.

...if you mean via my collection then anything with [AGA] / [AmigaCD] / [CD32] after the config name uses AGA settings already

BullyDog · 09 July 2018, 14:33

Quote:

Originally Posted by DamienD

...if you mean via my collection then anything with [AGA] / [AmigaCD] / [CD32] after the config name uses AGA settings already

Hah! So it did. I noticed that my Amiga Forever don't have AGA games in the list.

Again, nice job Damien.

coder76 · 09 July 2018, 15:55

Quote:

Originally Posted by britelite

You do know that there are ISA SVGA-cards available, right? The speed of the ISA bus has nothing to do with resolution or bitdepth, only how fast the CPU can copy stuff to the VRAM. So yeah, it might not be comfortable to use 640x480x256c through an ISA-bus, but it's possible.

Yes, you are right, I was thinking too much in terms of how amiga memory system works. The PC's have always had better bandwidth for their CPUs to their video memory than Amigas.

BullyDog · 09 July 2018, 16:01

I guess that's why they cost thousands and thousands of dollars.

Foebane · 10 July 2018, 14:46

Is it true that the palette of VGA is 262,144 colours, and SVGA is 16,777,216? Seems like the Amiga has an SVGA advantage.

britelite · 10 July 2018, 15:08

Quote:

Originally Posted by Foebane

Is it true that the palette of VGA is 262,144 colours

Yes, the original VGA only has a colordepth of 18 bits.

Quote:

Seems like the Amiga has an SVGA advantage.

Considering AGA was released in the 90's, it would've been quite pathetic if it didn't support 24 bit colors.

Foebane · 10 July 2018, 15:44

Quote:

Originally Posted by britelite

Considering AGA was released in the 90's, it would've been quite pathetic if it didn't support 24 bit colors.

Especially with twice the number of bits available.

BullyDog · 10 July 2018, 18:27

24 bit = 256Rx256Gx256B.

16,777,216 colors!

Foebane · 10 July 2018, 19:44

No need to spell it out, BullyDog, we're all science geek nerd scientists here.

BullyDog · 10 July 2018, 19:45

Sorry, can't get the teacher out of me.

32 bit = 256Rx256Gx256B x 256 what?

Foebane · 10 July 2018, 19:48

Quote:

Originally Posted by BullyDog

Sorry, can't get the teacher out of me.

32 bit = 256Rx256Gx256B x 256 what?

It's usually an Alpha Channel for transparency.

BullyDog · 10 July 2018, 19:52

Not luminosity?

Foebane · 10 July 2018, 20:31

All I've ever heard for the fourth set of 8 bits was the Alpha Channel, as I said. If it wasn't used for advanced TV genlocks, then it was definitely used in OpenGL for games like Quake 3 Arena, etc.

BullyDog · 10 July 2018, 21:35

Ah, you are correct, it is transparency. The R G B themselves are luminosity.

College was back in 91. My old brain aren't remembering very well.

meynaf · 10 July 2018, 21:49

It's the eye that works this way. One cell type for lightness, three others for each color.

BullyDog · 10 July 2018, 22:10

You're talking about cones and rods for the eye. It's the brain that does the interpretations.

Look up optical illusions. It fools the brain.

meynaf · 11 July 2018, 09:29

Yes but no interpretation is needed for merely representing an image.
It's just that RGB isn't enough for representing everything and there is some logic in wanting to add lightness to that.

BullyDog · 11 July 2018, 15:16

Quote:

Originally Posted by meynaf

Yes but no interpretation is needed for merely representing an image.
It's just that RGB isn't enough for representing everything and there is some logic in wanting to add lightness to that.

That's what I thought is luminosity but instead we call it transparency. The RGB goes from dark to bright like dark red to pink for R. Transparency are what add brightness to the color.

I have that correct?

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09 July 2018, 16:01	#26
BullyDog Registered User Join Date: Jul 2018 Location: Texas USA Age: 73 Posts: 184	I guess that's why they cost thousands and thousands of dollars.

10 July 2018, 14:46	#27
Foebane Banned Join Date: Sep 2011 Location: Cardiff, UK Age: 51 Posts: 2,871	Is it true that the palette of VGA is 262,144 colours, and SVGA is 16,777,216? Seems like the Amiga has an SVGA advantage.

10 July 2018, 18:27	#30
BullyDog Registered User Join Date: Jul 2018 Location: Texas USA Age: 73 Posts: 184	24 bit = 256Rx256Gx256B. 16,777,216 colors!

10 July 2018, 19:44	#31
Foebane Banned Join Date: Sep 2011 Location: Cardiff, UK Age: 51 Posts: 2,871	No need to spell it out, BullyDog, we're all science geek nerd scientists here.

10 July 2018, 19:45	#32
BullyDog Registered User Join Date: Jul 2018 Location: Texas USA Age: 73 Posts: 184	Sorry, can't get the teacher out of me. 32 bit = 256Rx256Gx256B x 256 what?

10 July 2018, 19:52	#34
BullyDog Registered User Join Date: Jul 2018 Location: Texas USA Age: 73 Posts: 184	Not luminosity?

10 July 2018, 20:31	#35
Foebane Banned Join Date: Sep 2011 Location: Cardiff, UK Age: 51 Posts: 2,871	All I've ever heard for the fourth set of 8 bits was the Alpha Channel, as I said. If it wasn't used for advanced TV genlocks, then it was definitely used in OpenGL for games like Quake 3 Arena, etc.

10 July 2018, 21:35	#36
BullyDog Registered User Join Date: Jul 2018 Location: Texas USA Age: 73 Posts: 184	Ah, you are correct, it is transparency. The R G B themselves are luminosity. College was back in 91. My old brain aren't remembering very well.

10 July 2018, 21:49	#37
meynaf son of 68k Join Date: Nov 2007 Location: Lyon / France Age: 51 Posts: 5,323	It's the eye that works this way. One cell type for lightness, three others for each color.

10 July 2018, 22:10	#38
BullyDog Registered User Join Date: Jul 2018 Location: Texas USA Age: 73 Posts: 184	You're talking about cones and rods for the eye. It's the brain that does the interpretations. Look up optical illusions. It fools the brain.

11 July 2018, 09:29	#39
meynaf son of 68k Join Date: Nov 2007 Location: Lyon / France Age: 51 Posts: 5,323	Yes but no interpretation is needed for merely representing an image. It's just that RGB isn't enough for representing everything and there is some logic in wanting to add lightness to that.

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