glWindowPos — specify the raster position in window coordinates for pixel operations
void glWindowPos2s( | GLshort | x, |
| GLshort | y); |
void glWindowPos2i( | GLint | x, |
| GLint | y); |
void glWindowPos2f( | GLfloat | x, |
| GLfloat | y); |
void glWindowPos2d( | GLdouble | x, |
| GLdouble | y); |
void glWindowPos3s( | GLshort | x, |
| GLshort | y, | |
| GLshort | z); |
void glWindowPos3i( | GLint | x, |
| GLint | y, | |
| GLint | z); |
void glWindowPos3f( | GLfloat | x, |
| GLfloat | y, | |
| GLfloat | z); |
void glWindowPos3d( | GLdouble | x, |
| GLdouble | y, | |
| GLdouble | z); |
void glWindowPos2sv( | const GLshort * | v); |
void glWindowPos2iv( | const GLint * | v); |
void glWindowPos2fv( | const GLfloat * | v); |
void glWindowPos2dv( | const GLdouble * | v); |
void glWindowPos3sv( | const GLshort * | v); |
void glWindowPos3iv( | const GLint * | v); |
void glWindowPos3fv( | const GLfloat * | v); |
void glWindowPos3dv( | const GLdouble * | v); |
v
Specifies a pointer to an array of two or three elements,
specifying
The GL maintains a 3D position in window coordinates. This position, called the raster position, is used to position pixel and bitmap write operations. It is maintained with subpixel accuracy. See glBitmap, glDrawPixels, and glCopyPixels.
glWindowPos2 specifies the
glWindowPos3 specifies all three coordinates.
The
glWindowPos directly updates the
where
GL_DEPTH_RANGE's near value, and
GL_DEPTH_RANGE's far value. See glDepthRange.
The specified coordinates are not clip-tested, causing the raster position to always be valid.
The current raster position also includes some associated color data and
texture coordinates. If lighting is enabled, then
GL_CURRENT_RASTER_COLOR (in RGBA mode) or GL_CURRENT_RASTER_INDEX
(in color index mode) is set to the color produced by the lighting
calculation (see glLight, glLightModel, and glShadeModel).
If lighting is disabled, current color (in RGBA mode, state variable
GL_CURRENT_COLOR) or color index (in color index mode, state variable
GL_CURRENT_INDEX) is used to update the current raster color.
GL_CURRENT_RASTER_SECONDARY_COLOR (in RGBA mode) is likewise updated.
Likewise, GL_CURRENT_RASTER_TEXTURE_COORDS is updated as a function of
GL_CURRENT_TEXTURE_COORDS, based on the texture matrix and the texture
generation functions (see glTexGen). The
GL_CURRENT_RASTER_DISTANCE is set to the GL_CURRENT_FOG_COORD.
glWindowPos is available only if the GL version is 1.4 or greater.
The raster position is modified by glRasterPos, glBitmap, and
glWindowPos.
Calling glDrawElements, or glDrawRangeElements may leave the
current color or index indeterminate.
If glWindowPos is executed while the current color or index is indeterminate, the
current raster color or current raster index remains indeterminate.
There are distinct raster texture coordinates for each texture unit. Each
texture unit's current raster texture coordinates are updated by glWindowPos.
GL_INVALID_OPERATION is generated if glWindowPos
is executed between the execution of glBegin
and the corresponding execution of glEnd.
glGet with argument GL_CURRENT_RASTER_POSITION
glGet with argument GL_CURRENT_RASTER_POSITION_VALID
glGet with argument GL_CURRENT_RASTER_DISTANCE
glGet with argument GL_CURRENT_RASTER_COLOR
glGet with argument GL_CURRENT_RASTER_SECONDARY_COLOR
glGet with argument GL_CURRENT_RASTER_INDEX
glGet with argument GL_CURRENT_RASTER_TEXTURE_COORDS
glBitmap, glCopyPixels, glDrawArrays, glDrawElements, glDrawRangeElements, glDrawPixels, glMultiTexCoord, glRasterPos, glTexCoord, glTexGen, glVertex
Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.