glGetIntegervGLenum

glGetIntegerv is a function in the OpenGL API used to query the current values of various implementation-dependent state variables. It takes two arguments: a GLenum representing the specific parameter to query and a pointer to an integer array where the retrieved value will be stored.

The GLenum parameter specifies which state variable to retrieve. OpenGL defines a large set of GLenum constants, each corresponding to a different setting such as the current viewport dimensions, the maximum number of texture units, or the current blend color. For example, GL_VIEWPORT would be used to query the viewport settings, and GL_MAX_TEXTURE_UNITS would query the maximum number of available texture units.

The second argument is a pointer to a GLint array. The size of this array depends on the GLenum being queried. Some parameters return a single integer value, while others return multiple values. For instance, GL_VIEWPORT returns four integers (x, y, width, height), so the provided array must be large enough to hold these. The function populates this array with the current value of the specified state variable.

This function is crucial for understanding the current state of the OpenGL context and for dynamically adjusting rendering behavior based on hardware capabilities or application settings. It allows developers to query information about the OpenGL implementation, such as limits, capabilities, and current configuration.