About the usage of glUniform{2|3|4}iv.

[newbiecow]

As clarified in the reference, the glUniform{2|3|4}iv takes three parameters, location, count and v. But when count is greater than 1, what is the structure of v?
Suppose I call it as the following.

glUniform2iv(loc,2,v);

Which way should I set v?

int v={{somevalue,somevalue},{somevalue,somevalue}};

or

int v={somevalue,somevalue,somevalue,somevalue};

Thanks in advance!

:devilish:

[Alfonse Reinheart]

The count parameter is the number of elements in the array you're modifying, or 1 if you're not modifying an array. The number in the function name is the size of an element. 1 means scalar (float, int, uint, etc). 2 means 2-element vector (vec2, ivec2, uvec2, etc). And so on.

If you're modifying a single vec2, you use glUniform2fv(..., 1, <array of two floats>);. If you're modifying a `vec2[3]`, then you use glUniform2fv(..., 3, <array of 2 * 3 floats>);

[newbiecow]

Thanks for your great help!


Best regards,

newbiecow