glxusexfont(3g) [centos man page]
GLXUSEXFONT(3G) OpenGL Manual GLXUSEXFONT(3G) NAME
glXUseXFont - create bitmap display lists from an X font C SPECIFICATION
void glXUseXFont(Font font, int first, int count, int listBase); PARAMETERS
font Specifies the font from which character glyphs are to be taken. first Specifies the index of the first glyph to be taken. count Specifies the number of glyphs to be taken. listBase Specifies the index of the first display list to be generated. DESCRIPTION
glXUseXFont generates count display lists, named listBase through listBase + count - 1, each containing a single glBitmap() command. The parameters of the glBitmap() command of display list listBase + i are derived from glyph first + i. Bitmap parameters xorig, yorig, width, and height are computed from font metrics as descent - 1, - lbearing, rbearing - lbearing, and ascent + descent, respectively. xmove is taken from the glyph's width metric, and ymove is set to zero. Finally, the glyph's image is converted to the appropriate format for glBitmap(). Using glXUseXFont may be more efficient than accessing the X font and generating the display lists explicitly, both because the display lists are created on the server without requiring a round trip of the glyph data, and because the server may choose to delay the creation of each bitmap until it is accessed. Empty display lists are created for all glyphs that are requested and are not defined in font. glXUseXFont is ignored if there is no current GLX context. ERRORS
BadFont is generated if font is not a valid font. GLXBadContextState is generated if the current GLX context is in display-list construction mode. GLXBadCurrentWindow is generated if the drawable associated with the current context of the calling thread is a window, and that window is no longer valid. SEE ALSO
glBitmap(), glXMakeCurrent() COPYRIGHT
Copyright (C) 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/. AUTHORS
opengl.org opengl.org 06/10/2014 GLXUSEXFONT(3G)
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GLXMAKECURRENT(3G) OpenGL Manual GLXMAKECURRENT(3G) NAME
glXMakeCurrent - attach a GLX context to a window or a GLX pixmap C SPECIFICATION
Bool glXMakeCurrent(Display * dpy, GLXDrawable drawable, GLXContext ctx); PARAMETERS
dpy Specifies the connection to the X server. drawable Specifies a GLX drawable. Must be either an X window ID or a GLX pixmap ID. ctx Specifies a GLX rendering context that is to be attached to drawable. DESCRIPTION
glXMakeCurrent does two things: It makes ctx the current GLX rendering context of the calling thread, replacing the previously current context if there was one, and it attaches ctx to a GLX drawable, either a window or a GLX pixmap. As a result of these two actions, subsequent GL rendering calls use rendering context ctx to modify GLX drawable drawable (for reading and writing). Because glXMakeCurrent always replaces the current rendering context with ctx, there can be only one current context per thread. Pending commands to the previous context, if any, are flushed before it is released. The first time ctx is made current to any thread, its viewport is set to the full size of drawable. Subsequent calls by any thread to glXMakeCurrent with ctx have no effect on its viewport. To release the current context without assigning a new one, call glXMakeCurrent with drawable set to None and ctx set to NULL. glXMakeCurrent returns True if it is successful, False otherwise. If False is returned, the previously current rendering context and drawable (if any) remain unchanged. NOTES
A process is a single-execution environment, implemented in a single address space, consisting of one or more threads. A thread is one of a set of subprocesses that share a single address space, but maintain separate program counters, stack spaces, and other related global data. A thread that is the only member of its subprocess group is equivalent to a process. ERRORS
BadMatch is generated if drawable was not created with the same X screen and visual as ctx. It is also generated if drawable is None and ctx is not NULL. BadAccess is generated if ctx was current to another thread at the time glXMakeCurrent was called. GLXBadDrawable is generated if drawable is not a valid GLX drawable. GLXBadContext is generated if ctx is not a valid GLX context. GLXBadContextState is generated if glXMakeCurrent is executed between the execution of glBegin() and the corresponding execution of glEnd(). GLXBadContextState is also generated if the rendering context current to the calling thread has GL renderer state GLX_FEEDBACK or GLX_SELECT. GLXBadCurrentWindow is generated if there are pending GL commands for the previous context and the current drawable is a window that is no longer valid. BadAlloc may be generated if the server has delayed allocation of ancillary buffers until glXMakeCurrent is called, only to find that it has insufficient resources to complete the allocation. SEE ALSO
glXCreateContext(), glXCreateGLXPixmap()glXGetCurrentContext(), glXGetCurrentDisplay(), glXGetCurrentDrawable(), glXGetCurrentReadDrawable(), glXMakeContextCurrent() COPYRIGHT
Copyright (C) 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/. AUTHORS
opengl.org opengl.org 06/10/2014 GLXMAKECURRENT(3G)