GPU Delay - A delay plugin running on a graphics card

[Nils Schneider]

Adjusted the sliders? (Feedback etc)?

Both would be nice

[RPH]

Adjusted the sliders? (Feedback etc)?

Both would be nice

Yep, tried it,. nothing happend.

logs :

http://www.rh-modules.nl/temp/logs.rar

[Nils Schneider]

Thanks for the logs. Your buffer size is set too big, try it with 2048 max and it should work.

[fake]

Maybe a stupid question but...

I know this is gpu based but does the ammount of memory on board the card make any difference?

I'm thinking of getting another card see so any recommendations apreciated, i'm on an agp x8 slot.

Cheers

fake

[RPH]

ah yes,.
it got reset i guess, because i had turned it down.

It works fine now.

cya,
Rob.

[Nils Schneider]

I know this is gpu based but does the ammount of memory on board the card make any difference?

GPU effects require memory, but never as much as a graphics card can offer. So memorywise you're free to buy whatever you want

For example a 128MB graphics card has more than 100 times more memory than a TC Electronic Powercore DSP card.

[fake]

Thanks for the quick reply.

fake

[ddummer]

A Graphic card will act like a math processor for the VST plugin
and not like "I upload my plugin to the graphic card and run it there" kind of deal....

//Daniel

[Nils Schneider]

Hmmmmm.... not exactly

A little "program" (the shader that does the computation) is uploaded to the graphics card and is then executed there completely. The "host" (the real VST plugin) is just sending audio data, receiving the resulting audio data, and sets some parameters for the program (e.g. delay length etc...).

Of course, the VST connection etc and everything that makes this thing to a DLL is made on the CPU.

Just to keep everyone relaxing: A 128MB graphics card would be able to store over 10 minutes of sound data (44,1KHZ Mono 32 Bit), so memorywise there is really nothing to worry about

[ddummer]

Cool! So how much "logic" can you run within the Graphic card
and what are the code basis for it (language)?

//Daniel

[fake]

Just checked, a radeon 9550 with 256mb costs around £40.

A trip to the shop tomorrow me thinks!

[Aleksey Vaneev]

Cool! So how much "logic" can you run within the Graphic card
and what are the code basis for it (language)?

//Daniel

Code something like this:

// Shader_Butterfly
"PARAM c0 = program.local[0];\n"
"TEX r0, t0, texture[1], 2D;\n"
"MUL r1.y, r0.x, c0.y;\n"
"FRC r1.x, r1.y;\n"
"FLR r1.y, r1.y;\n"
"MUL r1.y, r1.y, c0.y;\n"
"MUL r2.y, r0.y, c0.y;\n"
"FRC r2.x, r2.y;\n"
"FLR r2.y, r2.y;\n"
"MUL r2.y, r2.y, c0.y;\n"
"TEX r3, r1, texture[0], 2D;\n"
"TEX r4, r2, texture[0], 2D;\n"
"MAD r5.x, -r0.w, r4.y, r3.x;\n"
"MAD r5.x, r0.z, r4.x, r5.x;\n"
"MAD r5.y, +r0.w, r4.x, r3.y;\n"
"MAD r5.y, r0.z, r4.y, r5.y;\n"
"MOV out, r5;\n",

[Nils Schneider]

Yep that much logic, and exactly that is what makes it so interesing. The're are several different languages available, some of them depend on the graphics API being used. When using OpenGL, there is "GLSL" which stands for OpenGL Shading Language, DirectX calls it "HLSL" (high level shading language). But you can program them even in assembly, or you can use the free portable shading language Cg ("C for graphics").

Those high level languages are all quite similar though so most of the code can be ported.

[ddummer]

And just how much do I want to take a programming de-tour to
the GPU board right now....

Looks like there is lots of over there...

//Daniel

[fake]

quote

"Those high level languages are all quite similar though so most of the code can be ported"

Linux ???

The LADSPA plugins could make great use of this, maybe.........

OK, i'll get me coat.

fake