glGetTransformFeedbackiv(3G)
NAME
glGetTransformFeedbackiv - query the state of a transform feedback object.
C SPECIFICATION
void glGetTransformFeedbackiv(GLuint xfb, GLenum pname, GLint *param);
void glGetTransformFeedbacki_v(GLuint xfb, GLenum pname, GLuint index,
GLint *param);
void glGetTransformFeedbacki64_v(GLuint xfb, GLenum pname,
GLuint index, GLint64 *param);
PARAMETERS
xfb
The name of an existing transform feedback object, or zero for the
default transform feedback object.
pname
Property to use for the query. Must be one of the values:
GL_TRANSFORM_FEEDBACK_BUFFER_BINDING,
GL_TRANSFORM_FEEDBACK_BUFFER_START,
GL_TRANSFORM_FEEDBACK_BUFFER_SIZE, GL_TRANSFORM_FEEDBACK_PAUSED,
GL_TRANSFORM_FEEDBACK_ACTIVE.
index
Index of the transform feedback stream (for indexed state).
param
The address of a buffer into which will be written the requested
state information.
DESCRIPTION
In order to use the Transform Feedback functionality, you need to
configure the Transform Feedback Buffer indexed bindings. This can be
achieved by either using glBindBufferBase or glBindBuffersBase to
associate whole buffer object storage to one of the Transform Feedback
Binding Points, or by calling glBindBufferRange or glBindBuffersRange
to use a region of a buffer object storage for the binding. You may
want to (but are not required to) bind a Transform Feedback Object
first, in order to cache the binding configuration. This usually allows
you to restore the Transform Feedback configuration faster, than if you
were to execute a list of API calls necessary to set up the Transform
Feedback state of your liking.
This reference page discusses two types of getters that operate on
Transform Feedback Objects and their bindings.
The first class operates on general Transform Feedback binding point
and includes glGetTransformFeedbackiv function.
glGetTransformFeedbackiv can be used to retrieve information about
Transform Feedback object bound to the general Transform Feedback
binding point, as configured with a glBindTransformFeedback call. In
this case, you can check:
* What the ID of the currently bound Transform Feedback Object is;
(GL_TRANSFORM_FEEDBACK_BUFFER_BINDING)
* Whether the Transform Feedback process is currently paused;
(GL_TRANSFORM_FEEDBACK_PAUSED)
* Whether the Transform Feedback process has been begun and is
currently undergoing; (GL_TRANSFORM_FEEDBACK_ACTIVE)
The latter class, which includes glGetTransformFeedbacki_v and
glGetTransformFeedbacki64_v functions, can be used to check what the
current configuration of each of the buffer object regions bound to
Transform Feedback Buffer binding points is. This allows you to query
for the following information:
* glGetTransformFeedbacki_v only: What the ID of the Buffer Object
bound to a Transform Feedback Binding Point of user-specified index
is; (GL_TRANSFORM_FEEDBACK_BUFFER_BINDING).
* glGetTransformFeedbacki64_v only: What the start offset configured
for the binding is; (GL_TRANSFORM_FEEDBACK_BUFFER_START);
* glGetTransformFeedbacki64_v only: What the length of the region
used for the binding is; (GL_TRANSFORM_FEEDBACK_BUFFER_SIZE);
ERRORS
GL_INVALID_OPERATION error is generated if xfb is not zero or the name of an existing transform feedback object. GL_INVALID_ENUM error is generated by glGetTransformFeedbackiv if pname is not GL_TRANSFORM_FEEDBACK_PAUSED or GL_TRANSFORM_FEEDBACK_ACTIVE. GL_INVALID_ENUM error is generated by glGetTransformFeedbacki_v if pname is not GL_TRANSFORM_FEEDBACK_BUFFER_BINDING. GL_INVALID_ENUM error is generated by glGetTransformFeedbacki64_v if pname is not GL_TRANSFORM_FEEDBACK_BUFFER_START or GL_TRANSFORM_FEEDBACK_BUFFER_SIZE. GL_INVALID_VALUE error is generated by glGetTransformFeedbacki_v and glGetTransformFeedbacki64_v if index is greater than or equal to the number of binding points for transform feedback (the value of GL_MAX_TRANSFORM_FEEDBACK_BUFFERS).
VERSION SUPPORT
OpenGL Version
Function 2.0 2.1 3.0 3.1 3.2 3.3 4.0 4.1 4.2 4.3 4.4 4.5
/
Feature
Name
glGetTransformFeedbackiv - - - - - - - - - - -
glGetTransformFeedbacki_v - - - - - - - - - - -
glGetTransformFeedbacki64v - - - - - - - - - - -
SEE ALSO
glBindBufferBase(), glBindBufferRange(), glBindBuffersBase(), glBindBuffersRange(), glBindTransformFeedback()
COPYRIGHT
Copyright 2014 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.
COPYRIGHT
Copyright 2014 Khronos Group [FIXME: source] 07/22/2015 GLGETTRANSFORMFEEDBA(3G)
Opportunity
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
Free Books
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Education
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.
