greset(3G) greset(3G)
NAME
greset - resets graphics state
C SPECIFICATION
void greset()
PARAMETERS
none
DESCRIPTION
greset resets a portion of the graphics state of a window to its default.
See the following table for a listing of the state affected.
_____________________________________
| State | Value |
|____________________________________|
|backface mode off |
|blinking off |
|buffer mode single |
|color undefined |
|color map mode one map |
|concave off |
|cursor 0 (arrow) |
|depth range Zmin,Zmax |
|depthcue mode off |
|display mode color map |
|drawmode NORMALDRAW |
|font 0 |
|linestyle 0 (solid) |
|linewidth 1 pixel |
|lsrepeat 1 |
|pattern 0 (solid) |
|picking size 10x10 pixels |
|RGB color undefined |
|RGB shaderange undefined |
|RGB writemask undefined |
|shademodel GOURAUD |
|shaderange 0,7,Zmin,Zmax |
|viewport entire screen |
|writemask all planes enabled |
|zbuffer mode off |
|____________________________________|
Notes
⊕ Font 0 is a Helvetica-like font.
⊕ Zmin and Zmax are the minimum and maximum values that you can
store in the z-buffer. These depend on the graphics hardware
and are returned by getgdesc(GDZMIN) and getgdesc(GDZMAX).
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greset(3G) greset(3G)
⊕ On IRIS-4D B and G models, greset also sets lsbackup(FALSE) and
resetls(TRUE).
greset loads a 2-D orthographic projection transformation on the matrix
stack with left, right, bottom, and top set to the boundaries of the
screen (not the current window). It also turns on the cursor.
greset loads certain entries in the color map, as follows:
_______________________________________________
| | | RGB Value |
| Index | Name |________________________|
| | | Red | Green | Blue |
|______________________________________________|
| 0 BLACK 0 0 0 |
| 1 RED 255 0 0 |
| 2 GREEN 0 255 0 |
| 3 YELLOW 255 255 0 |
| 4 BLUE 0 0 255 |
| 5 MAGENTA 255 0 255 |
| 6 CYAN 0 255 255 |
| 7 WHITE 255 255 255 |
|all others unnamed unchanged |
|______________________________________________|
It loads the PUPDRAW color map with the following entries:
________________________________________
| | | RGB Value |
|Index | Name |____________________|
| | | Red | Green | Blue |
|_______________________________________|
| 1 PUP_COLOR 255 0 0 |
| 2 PUP_BLACK 0 0 0 |
| 3 PUP_WHITE 255 255 255 |
|_______________________________________|
It loads the CURSORDRAW color map with the following entries:
____________________________
| | RGB Value |
|Index |____________________|
| | Red | Green | Blue |
|___________________________|
| 1 255 0 0 |
| 2 255 255 255 |
| 3 255 0 0 |
|___________________________|
On systems that do not have a 2-plane cursor, only index 1 is loaded.
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greset(3G) greset(3G)
SEE ALSO
getgdesc
NOTES
This routine is available only in immediate mode.
greset sets the viewport and the projection transformation to values
which assume that the current window occupies the entire screen, i.e. it
was created via ginit or gbegin. If this is not the case, you will
probably want to call reshapeviewport and load a different projection
transformation after calling greset.
This routine remains a part of the Graphics Library for reasons of
backwards compatibility only. We do not recommend the use of this
routine in new development.
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