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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GLXCREATEPBUFFER(3G) OpenGL Manual GLXCREATEPBUFFER(3G) NAME
glXCreatePbuffer - create an off-screen rendering area C SPECIFICATION
GLXPbuffer glXCreatePbuffer(Display * dpy, GLXFBConfig config, const int * attrib_list); PARAMETERS
dpy Specifies the connection to the X server. config Specifies a GLXFBConfig structure with the desired attributes for the window. attrib_list Specifies a list of attribute value pairs, which must be terminated with None or NULL. Accepted attributes are GLX_PBUFFER_WIDTH, GLX_PBUFFER_HEIGHT, GLX_PRESERVED_CONTENTS, and GLX_LARGEST_PBUFFER. DESCRIPTION
glXCreatePbuffer creates an off-screen rendering area and returns its XID. Any GLX rendering context that was created with respect to config can be used to render into this window. Use glXMakeContextCurrent() to associate the rendering area with a GLX rendering context. The accepted attributes for a GLXPbuffer are: GLX_PBUFFER_WIDTH Specify the pixel width of the requested GLXPbuffer. The default value is 0. GLX_PBUFFER_HEIGHT Specify the pixel height of the requested GLXPbuffer. The default value is 0. GLX_LARGEST_PBUFFER Specify to obtain the largest available pixel buffer, if the requested allocation would have failed. The width and height of the allocated pixel buffer will never exceed the specified GLX_PBUFFER_WIDTH or GLX_PBUFFER_HEIGHT, respectively. Use glXQueryDrawable() to retrieve the dimensions of the allocated pixel buffer. The default value is False. GLX_PRESERVED_CONTENTS Specify if the contents of the pixel buffer should be preserved when a resource conflict occurs. If set to False, the contents of the pixel buffer may be lost at any time. If set to True, or not specified in attrib_list, then the contents of the pixel buffer will be preserved (most likely by copying the contents into main system memory from the frame buffer). In either case, the client can register (using glXSelectEvent(), to receive pixel buffer clobber events that are generated when the pbuffer contents have been preserved or damaged. GLXPbuffers contain the color and ancillary buffers specified by config. It is possible to create a pixel buffer with back buffers and to swap those buffers using glXSwapBuffers(). NOTES
glXCreatePbuffer 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. GLXPbuffers are allocated from frame buffer resources; applications should consider deallocating them when they are not in use. ERRORS
BadAlloc is generated if there are insufficient resources to allocate the requested GLXPbuffer. GLXBadFBConfig is generated if config is not a valid GLXFBConfig. BadMatch is generated if config does not support rendering to pixel buffers (e.g., GLX_DRAWABLE_TYPE does not contain GLX_PBUFFER_BIT). SEE ALSO
glXChooseFBConfig(), glXCreatePbuffer, glXMakeContextCurrent(), glXSelectEvent() 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 GLXCREATEPBUFFER(3G)