glGetTexLevelParameter

glGetTexLevelParameter is a function in the OpenGL graphics API used to query parameters of a texture at a specific mipmap level. It allows applications to retrieve information about how a texture is stored and processed. The function takes three arguments: the target texture, the level of detail (mipmap level), and the parameter name to query. The target can be GL_TEXTURE_1D, GL_TEXTURE_2D, GL_TEXTURE_3D, or their cube map equivalents. The level of detail specifies which mipmap image is being queried, with level 0 being the base texture. The parameter name indicates what information is desired.

Commonly queried parameters include GL_TEXTURE_WIDTH, GL_TEXTURE_HEIGHT, and GL_TEXTURE_DEPTH, which return the dimensions of the texture at the specified level. GL_TEXTURE_INTERNAL_FORMAT reports the internal pixel format of the texture. GL_TEXTURE_COMPONENTS indicates the number of color components (e.g., RGB, RGBA). GL_TEXTURE_RED_SIZE, GL_TEXTURE_GREEN_SIZE, GL_TEXTURE_BLUE_SIZE, and GL_TEXTURE_ALPHA_SIZE return the number of bits per component. GL_TEXTURE_WIDTH, GL_TEXTURE_HEIGHT, and GL_TEXTURE_DEPTH are useful for determining the size of texture data when uploading or processing textures. The internal format and component sizes are important for understanding how the texture data is stored and accessed. This function is typically used for debugging or for dynamically adjusting rendering based on texture properties.