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2004-10-26 06:24

Stingray
Account closed

Registered: Feb 2003
Posts: 117

FASTER 3D GRAPHICS

I've heard it said before that the way the VIC chip addresses memory (8x8 cells) makes it slower fo rendering graphics because of the extra calculations needed. So what way would you have had the Commodore engineers design an alternative addressing mode so that 3D graphics could be calculated quicker? I would realy appreciate your ideas on this.

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2010-09-07 10:39

Frantic

Registered: Mar 2003
Posts: 1647

Aha! I see this is hardware is suitable for nazi propaganda! ;)

2010-09-07 10:54

Stingray
Account closed

Registered: Feb 2003
Posts: 117

LOL, inspired by Wolfenstein :)

2010-09-07 12:21

TWW

Registered: Jul 2009
Posts: 545

I'll take one. When do you expect to have it in mass-production?

;)

2010-09-07 13:05

Stingray
Account closed

Registered: Feb 2003
Posts: 117

At this rate 2020, which really sux cus I think the world is meant to end in 2012 or something? Hopefully soon but just depends on how much free time I get :)

2010-09-07 14:25

encore

Registered: Aug 2010
Posts: 67

Just came to think that this could make Stunt Car Racer look like how it did on the Amiga/Atari version (and probably increase framerate too). The Vic-X concept was new to me but sounds very interesting.

2010-09-07 14:41

Oswald

Registered: Apr 2002
Posts: 5086

stunt car does not use eor filling, it fills only the sky, and even that on a char by char basis, when it hits the road then goes pixel by pixel...

2011-05-13 07:38

Fresh

Registered: Jan 2005
Posts: 101

I followed this thread waiting to see the birth of a new hw but it looks like too much time has passed since last Stingray's post...
It sounded very promising, I really hope this thing still being under development.
... any news about this lil beauty?

2011-05-13 09:30

WVL

Registered: Mar 2002
Posts: 899

Jackasser : how many fps could your 3d engine put out if you'd have had EOR-on-the-fly and clear-memory?

2011-05-13 09:37

JackAsser

Registered: Jun 2002
Posts: 2014

Quote: Jackasser : how many fps could your 3d engine put out if you'd have had EOR-on-the-fly and clear-memory?

WVL: dunno to be honest, not that much I think. When the FPS is slow most time is spent in math and line drawing anyway. Using the c128 version u get a frame rate counter. Stand close to a wall so that you only see one complete solid, then u get the EOR+CLEAR fps basically. When the FPS drops it's because of line drawing and math, not filling and clearing.

2011-05-13 10:29

WVL

Registered: Mar 2002
Posts: 899

yesyes, i understand clearing and EOR take the same time always... I can code too, ya know :D

let's calc..

eor+sta takes 6 cycles per byte (if you plot inside the eor-speedcode, that is). 'dumb' clearing takes 4 cycles/byte (storing 0 in the eor-speedcode).

that's 10 cycles per byte. Let's say half of the screen get's updated, then you have 40*200/2 = 4000 bytes = 40.000 cycles saved. So that's about 2 frames.

Now let's do some maths..

fps	frames/update	VICX frames/update	VICX fps	speed increase
1	50,0		48,0			1,0		4%
2	25,0		23,0			2,2		9%
3	16,7		14,7			3,4		14%
4	12,5		10,5			4,8		19%
5	10,0		8,0			6,3		25%
6	8,3		6,3			7,9		32%
7	7,1		5,1			9,7		39%
8	6,3		4,3			11,8		47%
9	5,6		3,6			14,1		56%
10	5,0		3,0			16,7		67%
11	4,5		2,5			19,6		79%
12	4,2		2,2			23,1		92%
13	3,8		1,8			27,1		108%
14	3,6		1,6			31,8		127%
15	3,3		1,3			37,5		150%
16	3,1		1,1			44,4		178%
17	2,9		1,0			50,0		194%
18	2,8		1,0			50,0		178%
19	2,6		1,0			50,0		163%
20	2,5		1,0			50,0		150%
21	2,4		1,0			50,0		138%
22	2,3		1,0			50,0		127%
23	2,2		1,0			50,0		117%
24	2,1		1,0			50,0		108%
25	2,0		1,0			50,0		100%

No idea how many fps it can do now though, but this should give a good idea about the increase in speed.

I'd call anything above 10fps good for c64 purposes.. considering that, it's a bit disappointing that only the 7-9 fps get boosted to 10fps..

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