glxquerycontextinfoext(3g) [centos man page]
GLXQUERYCONTEXTINFOE(3G) OpenGL Manual GLXQUERYCONTEXTINFOE(3G) NAME
glXQueryContextInfoEXT - query context information C SPECIFICATION
int glXQueryContextInfoEXT(Display * dpy, GLXContext ctx, int attribute, int * value); PARAMETERS
dpy Specifies the connection to the X server. ctx Specifies a GLX rendering context. attribute Specifies that a context parameter should be retrieved. Must be one of GLX_SHARED_CONTEXT_EXT, GLX_VISUAL_ID_EXT, or GLX_SCREEN_EXT. value Contains the return value for attribute. DESCRIPTION
glXQueryContextInfoEXT sets value to the value of attribute with respect to ctx. glXQueryContextInfoEXT returns an error code if it fails for any reason. Otherwise, Success is returned. attribute may be one of the following: GLX_SHARED_CONTEXT_EXT Returns the XID of the share list context associated with ctx at its creation. GLX_VISUAL_ID_EXT Returns the XID of the GLX Visual associated with ctx. GLX_SCREEN_EXT Returns the screen number associated with ctx. This call may cause a round-trip to the server. glXQueryContextInfoEXT is part of the EXT_import_context extension, not part of the core GLX command set. If _glxextstring(EXT_import_context) is included in the string returned by glXQueryExtensionsString(), when called with argument GLX_EXTENSIONS, extension EXT_import_context is supported. ERRORS
GLXBadContext is generated if ctx does not refer to a valid context. GLX_BAD_ATTRIBUTE is returned if attribute is not a valid GLX context attribute. fred GLX_BAD_CONTEXT is returned if attribute is not a valid context. SEE ALSO
glXCreateContext(), glXQueryVersion(), glXQueryExtensionsString() 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 GLXQUERYCONTEXTINFOE(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)