What is the maximum size of a uniform array that can be passed to a shader in ios?

Question

I am using instanced rendering by passing an array of model view matrices. What is the maximum array size possible for a particular uniform?

Answer 1

This value will vary by hardware and implementation. I believe that

int maxUniformVectors;
glGet(GL_MAX_VERTEX_UNIFORM_VECTORS, &maxUniformVectors);

should answer your question.

From the docs :

This should return "the maximum number of four-element floating-point, integer, or boolean vectors that can be held in uniform variable storage for a vertex shader. The value must be at least 128.