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Re: Multi-Pass GLSL Shaders

Subject: Re: Multi-Pass GLSL Shaders
From: Allan Schaffer <email@hidden>
Date: Tue, 19 Feb 2008 16:38:27 -0800
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On Feb 19, 2008, at 3:37 AM, Alex Drinkwater wrote:

I know I've mentioned this a couple of times, but I'd
really like a definitive answer on this one.

Multi-pass GLSL shaders in Quartz Composer:
possible/not possible?
possible in a future release/never going to happen?


The GLSL patch only supports single-pass shaders currently.

An experiment to try (if the 2nd+ passes are all fragment ops) would be to break down your shader by pass, put the GLSL shader patch into a Render in Image patch for the first pass, and feed that texture to another GLSL patch for the 2nd pass, and so on.

A feature request to support multi-pass shaders would be completely reasonable. Post it (with details of your usage case) to http://bugreporter.apple.com/

Allan
___________

Allan Schaffer
Graphics Evangelist
Worldwide Developer Relations

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References:
	>Multi-Pass GLSL Shaders (From: Alex Drinkwater <email@hidden>)

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