UNTITLED LOCAL UNTITLED
NAME
glutLayerGet -- Allows you to get some overlay state/option variables.
LIBRARY
OpenGLUT - overlays
SYNOPSIS
#include <openglut.h>
int
glutLayerGet(GLenum eWhat);
PARAMETERS
eWhat Enumerated parameter ID.
DESCRIPTION
Returns some useful information about layers. Or, it would be useful if layers were implemented... eWhat may be given any of the follow-
ing values:
- GLUT_HAS_OVERLAY
- GLUT_LAYER_IN_USE
- GLUT_NORMAL_DAMAGED
0 unless the window system has told us that the normal layer is damaged (glutPostRedisplay() does not affect this).
- GLUT_OVERLAY_DAMAGED
-1 if no layer in use.
- GLUT_OVERLAY_POSSIBLE
- GLUT_TRANSPARENT_INDEX
-1 if no layer in use.
All information relates to the current window and any overlay that it may have.
SEE ALSO glutSetOption(3)glutGet(3)glutDeviceGet(3)glutGetModifiers(3)
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UNTITLED LOCAL UNTITLED
NAME
glutGet -- Allows you to query some general state/option variables.
LIBRARY
OpenGLUT - state
SYNOPSIS
#include <openglut.h>
int
glutGet(GLenum eWhat);
PARAMETERS
eWhat Enumerated parameter ID.
DESCRIPTION
This function permits you to query for the current value of many different OpenGLUT state variables. The current list is:
- GLUT_ACTION_ON_WINDOW_CLOSE
Allows you to do something other than die if the user closes one of your windows.
- GLUT_DISPLAY_MODE_POSSIBLE
- GLUT_ELAPSED_TIME
- GLUT_INIT_DISPLAY_MODE
- GLUT_INIT_STATE
- GLUT_INIT_WINDOW_HEIGHT
- GLUT_INIT_WINDOW_WIDTH
- GLUT_INIT_WINDOW_X
- GLUT_INIT_WINDOW_Y
- GLUT_MENU_NUM_ITEMS
- GLUT_RENDERING_CONTEXT
Allows you to specify context-sharing when you open new windows.
- GLUT_SCREEN_HEIGHT
- GLUT_SCREEN_HEIGHT_MM
Height in millimeters.
- GLUT_SCREEN_WIDTH
- GLUT_SCREEN_WIDTH_MM
Width in millimeters.
- GLUT_VERSION
- GLUT_WINDOW_ACCUM_ALPHA_SIZE
- GLUT_WINDOW_ACCUM_BLUE_SIZE
- GLUT_WINDOW_ACCUM_GREEN_SIZE
- GLUT_WINDOW_ACCUM_RED_SIZE
- GLUT_WINDOW_ALPHA_SIZE
- GLUT_WINDOW_BLUE_SIZE
- GLUT_WINDOW_BORDER_WIDTH
- GLUT_WINDOW_BUFFER_SIZE
- GLUT_WINDOW_COLORMAP_SIZE
- GLUT_WINDOW_CURSOR
- GLUT_WINDOW_DEPTH_SIZE
- GLUT_WINDOW_DOUBLEBUFFER
- GLUT_WINDOW_FORMAT_ID
System dependant.
- GLUT_WINDOW_GREEN_SIZE
- GLUT_WINDOW_HEADER_HEIGHT
- GLUT_WINDOW_HEIGHT
- GLUT_WINDOW_NUM_CHILDREN
- GLUT_WINDOW_NUM_SAMPLES
- GLUT_WINDOW_PARENT
- GLUT_WINDOW_RED_SIZE
- GLUT_WINDOW_RGBA
- GLUT_WINDOW_STENCIL_SIZE
- GLUT_WINDOW_STEREO
- GLUT_WINDOW_WIDTH
- GLUT_WINDOW_X
- GLUT_WINDOW_Y
Most of the above are very obvious, and so full documentation is postponed for now.
TODO
Go back and flesh out the above list.
This function is a bit messy, especially the WINCE part. Fix.
Lots of code uses return to hop out. Since it's such a sprawling function, it's easy to be in the middle and not be 100% sure if there's
anything important at the end of the function, or if it is safe to just "drop out" of the current case and head for the bottom.
Causes crashes (assertion failure) if you call this before having called glutInit()---other than GLUT_INIT_STATE and GLUT_ELAPSED_TIME.
Because various things can cause OpenGLUT to become deinitialized, we should probably either return default values of some kind or do minimal
initialization if we are called without proper initialization.
SEE ALSO glutSetOption(3)glutDeviceGet(3)glutGetModifiers(3)glutLayerGet(3)
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