Forums - Up-to how many uniform vectors declaration in fragment-shader is safe for adreno 200 for most compatobilty?

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Up-to how many uniform vectors declaration in fragment-shader is safe for adreno 200 for most compatobilty?
devang024
Join Date: 9 Sep 12
Posts: 2
Posted: Sun, 2012-09-09 06:57

In my project I am in need to use as many uniform vectors in fragment shaders as possible.

So, for much long time have been searching on net about common maximum numbers of uniform vectos in fragmet shader for all GPUs for mobiles.

I found that PowerVR SGX supports upto 64 uniform vectors in fragment shaders (Reference Link)

also on nvidia tegra devices (to my surprize!!!) have 1024 uniform vectors in fragment shaders ( Reference Link)

So, anyone let me know HOW MANY UNIFORM VECTORS ARE ALLOWED IN FRAGMENT SHADERS FOR ADRENO-200(ALSO,HOPEFULLY LATER VERSIONS!!)

THESE SPECIFICATIONS ARE FOR GLSL FOR OPENGL ES 2.0. 

My purpose to know this is to decide the minimum requirement so I can have less compatibilty isseues.

Thank you.

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Mark_Feldman Moderator
Join Date: 4 Jan 12
Posts: 61
Posted: Mon, 2012-09-10 15:38

Although 221 are exposed by the graphics driver there are some that are internally used, so 216 is a safe amount.

 

You can query the value with a glGetIntegerv(GL_MAX_FRAGMENT_UNIFORM_VECTORS)

 

Alternatively, you can try searching for GlView, an OpenGL Extensions Viewer/app which will display the maximum number of fragment uniforms.

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