Final answer:
GL repeat refers to the GL_REPEAT texture wrapping mode in OpenGL, which enables textures to repeat or tile across the surface of objects, especially when texture coordinates are outside the usual range. The correct option is A.
Step-by-step explanation:
GL repeat is an important concept in computer graphics, particularly when working with textures in OpenGL. The term GL_REPEAT is a texture wrapping mode that is used in OpenGL to specify how textures should be applied to objects when the texture coordinates extend beyond the standard coordinate range (0.0 to 1.0).
Texture wrapping is a method that determines how the texture is applied and what happens when texture coordinates fall outside the initial coordinate range. When GL_REPEAT is set for a texture's wrapping mode, the texture will be repeated or tiled across the surface, creating a seamless appearance if the texture is designed to be tileable. This mode can be set for either the S or T direction, which corresponds to the x and y axes of the texture's coordinate system.
This is in contrast to other wrapping modes, such as GL_CLAMP_TO_EDGE, which stretches the last pixel of the texture to fill the remaining area, or GL_CLAMP_TO_BORDER, which uses a user-specified border color. Texture repetition is commonly used in scenarios where a relatively small texture needs to cover a larger surface without increasing the texture size, which could have a significant impact on memory usage and performance.