glxquerydrawable(3g) [centos man page]
GLXQUERYDRAWABLE(3G) OpenGL Manual GLXQUERYDRAWABLE(3G) NAME
glXQueryDrawable - returns an attribute assoicated with a GLX drawable C SPECIFICATION
int glXQueryDrawable(Display * dpy, GLXDrawable draw, int attribute, unsigned int * value); PARAMETERS
dpy Specifies the connection to the X server. draw Specifies the GLX drawable to be queried. attribute Specifies the attribute to be returned. Must be one of GLX_WIDTH, GLX_HEIGHT, GLX_PRESERVED_CONTENTS, GLX_LARGEST_PBUFFER, or GLX_FBCONFIG_ID. value Contains the return value for attribute. DESCRIPTION
glXQueryDrawable sets value to the value of attribute with respect to the GLXDrawable draw. attribute may be one of the following: GLX_WIDTH Returns the width of ctx. GLX_HEIGHT Returns the height of ctx. GLX_PRESERVED_CONTENTS Returns True if the contents of a GLXPbuffer are preserved when a resource conflict occurs; False otherwise. GLX_LARGEST_PBUFFER Returns the value set when glXCreatePbuffer was called to create the GLXPbuffer. If False is returned, then the call to glXCreatePbuffer will fail to create a GLXPbuffer if the requested size is larger than the implementation maximum or available resources. If True is returned, a GLXPbuffer of the maximum availble size (if less than the requested width and height) is created. GLX_FBCONFIG_ID Returns the XID for draw. If draw is a GLXWindow or GLXPixmap and attribute is set to GLX_PRESERVED_CONTENTS or GLX_LARGETST_PBUFFER, the contents of value are undefined. If attribute is not one of the attributes listed above, the contents of value are unedfined. ERRORS
A GLXBadDrawable is generated if draw is not a valid GLXDrawable. SEE ALSO
glXCreateWindow(), glXCreatePixmap(), glXCreatePbuffer(), glXGetFBConfigAttrib(), glXChooseFBConfig() 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 GLXQUERYDRAWABLE(3G)
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GLXMAKECONTEXTCURREN(3G) OpenGL Manual GLXMAKECONTEXTCURREN(3G) NAME
glXMakeContextCurrent - attach a GLX context to a GLX drawable C SPECIFICATION
Bool glXMakeContextCurrent(Display * display, GLXDrawable draw, GLXDrawable read, GLXContext ctx); PARAMETERS
display Specifies the connection to the X server. draw Specifies a GLX drawable to render into. Must be an XID representing a GLXWindow, GLXPixmap, or GLXPbuffer. read Specifies a GLX drawable to read from. Must be an XID representing a GLXWindow, GLXPixmap, or GLXPbuffer. ctx Specifies the GLX context to be bound to read and ctx. DESCRIPTION
glXMakeContextCurrent binds ctx to the current rendering thread and to the draw and read GLX drawables. draw and read may be the same. draw is used for all OpenGL operations except: Any pixel data that are read based on the value of GLX_READ_BUFFER. Note that accumulation operations use the value of GLX_READ_BUFFER, but are not allowed unless draw is identical to read. Any depth values that are retrieved by glReadPixels() or glCopyPixels(). Any stencil values that are retrieved by glReadPixels() or glCopyPixels(). Frame buffer values are taken from draw. If the current rendering thread has a current rendering context, that context is flushed and replaced by ctx. The first time that ctx is made current, the viewport and scissor dimensions are set to the size of the draw drawable. The viewport and scissor are not modified when ctx is subsequently made current. To release the current context without assigning a new one, call glXMakeContextCurrent with draw and read set to None and ctx set to NULL. glXMakeContextCurrent returns True if it is successful, False otherwise. If False is returned, the previously current rendering context and drawable (if any) remain unchanged. NOTES
glXMakeContextCurrent is available only if the GLX version is 1.3 or greater. If the GLX version is 1.1 or 1.0, the GL version must be 1.0. If the GLX version is 1.2, then the GL version must be 1.1. If the GLX version is 1.3, then the GL version must be 1.2. ERRORS
BadMatch is generated if draw and read are not compatible. BadAccess is generated if ctx is current to some other thread. GLXContextState is generated if there is a current rendering context and its render mode is either GLX_FEEDBACK or GLX_SELECT. GLXBadContext is generated if ctx is not a valid GLX rendering context. GLXBadDrawable is generated if draw or read is not a valid GLX drawable. GLXBadWindow is generated if the underlying X window for either draw or read is no longer valid. GLXBadCurrentDrawable is generated if the previous context of the calling thread has unflushed commands and the previous drawable is no longer valid. BadAlloc is generated if the X server does not have enough resources to allocate the buffers. BadMatch is generated if: draw and read cannot fit into frame buffer memory simultaneously. draw or read is a GLXPixmap and ctx is a direct-rendering context. draw or read is a GLXPixmap and ctx was previously bound to a GLXWindow or GLXPbuffer. draw or read is a GLXWindow or GLXPbuffer and ctx was previously bound to a GLXPixmap. SEE ALSO
glXCreateNewContext(), glXCreateWindow(), glXCreatePixmap(), glXCreatePbuffer(), glXDestroyContext(), glXGetCurrentContext(), glXGetCurrentDisplay(), glXGetCurrentDrawable(), glXGetCurrentReadDrawable(), 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 GLXMAKECONTEXTCURREN(3G)