ios/mac shader - shared glsl source

Member

Posts: 86
Joined: 2008.04

Post: #1

Jun 13, 2011 — 02:09 PM

I would like to use the same shader in my mac app as in my iOS app - the only difference is the presence of the precision qualifiers.

Is there an easy approach to #define the precision qualifiers so that I can share the same shader source for both mac and iOS?

(OSC mentioned how to do this before, but I can't remember the details)

Thanks in advance for any help
:-)

OneSadCookie

Luminary

Posts: 5,125
Joined: 2002.04

Post: #2

Jun 13, 2011 — 03:50 PM

glShaderSource takes an array of strings that are concatenated together, so, on iOS, set string 0 to

Code:

#version 100

and on desktop, to

Code:

#version 110

#define highp

#define mediump

#define lowp

... and put your own source in string 1.

Where you need to declare global precision, you can use the GL_ES predefined macro to conditionalize:

Code:

#if defined(GL_ES)

precision highp float;

#endif

OptimisticMonkey

Member

Posts: 86
Joined: 2008.04

Post: #3

Jun 17, 2011 — 08:59 AM

Thanks OSC - That worked perfectly!

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