9.2 glutLayerGet

  glutLayerGet retrieves GLUT state pertaining to the layers of the current window.

Usage

int glutLayerGet(GLenum info);

info

Name of device information to retrieve.

GLUT_OVERLAY_POSSIBLE

Whether an overlay could be established for the current window given the current initial display mode. If false, glutEstablishOverlay will fail with a fatal error if called.

GLUT_LAYER_IN_USE

Either GLUT_NORMAL or GLUT_OVERLAY depending on whether the normal plane or overlay is the layer in use.

GLUT_HAS_OVERLAY

If the current window has an overlay established.

GLUT_TRANSPARENT_INDEX

The transparent color index of the overlay of the current window; negative one is returned if no overlay is in use.

GLUT_NORMAL_DAMAGED

True if the normal plane of the current window has damaged (by window system activity) since the last display callback was triggered. Calling glutPostRedisplay will not set this true.

GLUT_OVERLAY_DAMAGED

True if the overlay plane of the current window has damaged (by window system activity) since the last display callback was triggered. Calling glutPostRedisplay or glutPostOverlayRedisplay will not set this true. Negative one is returned if no overlay is in use.

Description

glutLayerGet retrieves GLUT layer information for the current window represented by integers. The info parameter determines what type of layer information to return.