glUniform2fv

glUniform2fv is a function in the OpenGL API used to set the value of a uniform variable within a shader program. Specifically, it is used to update a uniform variable that is of type `vec2`, which represents a two-component floating-point vector. The 'fv' suffix indicates that the function accepts an array of floating-point values.

The function takes three arguments. The first argument is an integer representing the location of the uniform variable. This location is typically obtained using glGetUniformLocation. The second argument specifies the number of `vec2` elements to be updated. The third argument is a pointer to a floating-point array containing the new values for the uniform variable. For each `vec2` element, two consecutive floating-point values in the array will be used.

Using glUniform2fv is an efficient way to upload multiple `vec2` values to the shader program at once, rather than calling a function like glUniform2f multiple times for each individual component. This can lead to performance improvements by reducing the number of API calls. The values set by glUniform2fv will remain in effect until they are updated again by another call to a uniform setting function or until the program is reloaded.