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gldrawtransformfeedback(3g) [centos man page]

GLDRAWTRANSFORMFEEDB(3G)					   OpenGL Manual					  GLDRAWTRANSFORMFEEDB(3G)

NAME
glDrawTransformFeedback - render primitives using a count derived from a transform feedback object C SPECIFICATION
void glDrawTransformFeedback(GLenum mode, GLuint id); PARAMETERS
mode Specifies what kind of primitives to render. Symbolic constants GL_POINTS, GL_LINE_STRIP, GL_LINE_LOOP, GL_LINES, GL_LINE_STRIP_ADJACENCY, GL_LINES_ADJACENCY, GL_TRIANGLE_STRIP, GL_TRIANGLE_FAN, GL_TRIANGLES, GL_TRIANGLE_STRIP_ADJACENCY, GL_TRIANGLES_ADJACENCY, and GL_PATCHES are accepted. id Specifies the name of a transform feedback object from which to retrieve a primitive count. DESCRIPTION
glDrawTransformFeedback draws primitives of a type specified by mode using a count retrieved from the transform feedback specified by id. Calling glDrawTransformFeedback is equivalent to calling glDrawArrays() with mode as specified, first set to zero, and count set to the number of vertices captured on vertex stream zero the last time transform feedback was active on the transform feedback object named by id. ERRORS
GL_INVALID_ENUM is generated if mode is not an accepted value. GL_INVALID_VALUE is generated if id is not the name of a transform feedback object. GL_INVALID_OPERATION is generated if a non-zero buffer object name is bound to an enabled array and the buffer object's data store is currently mapped. GL_INVALID_OPERATION is generated if a geometry shader is active and mode is incompatible with the input primitive type of the geometry shader in the currently installed program object. GL_INVALID_OPERATION is generated if mode is GL_PATCHES and no tessellation control shader is active. GL_INVALID_OPERATION is generated if glEndTransformFeedback() has never been called while the transform feedback object named by id was bound. SEE ALSO
glDrawArrays(), glDrawArraysInstanced(), glDrawElements(), glDrawRangeElements(), glDrawTransformFeedbackStream() COPYRIGHT
Copyright (C) 2010 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/. AUTHORS
opengl.org opengl.org 06/10/2014 GLDRAWTRANSFORMFEEDB(3G)

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GLBEGINTRANSFORMFEED(3G)					   OpenGL Manual					  GLBEGINTRANSFORMFEED(3G)

NAME
glBeginTransformFeedback - start transform feedback operation C SPECIFICATION
void glBeginTransformFeedback(GLenum primitiveMode); PARAMETERS
primitiveMode Specify the output type of the primitives that will be recorded into the buffer objects that are bound for transform feedback. C SPECIFICATION
void glEndTransformFeedback(void); DESCRIPTION
Transform feedback mode captures the values of varying variables written by the vertex shader (or, if active, the geometry shader). Transform feedback is said to be active after a call to glBeginTransformFeedback until a subsequent call to glEndTransformFeedback(). Transform feedback commands must be paired. If no geometry shader is present, while transform feedback is active the mode parameter to glDrawArrays() must match those specified in the following table: +-------------------------------------------+---------------------------------------------------+ | | | | Transform Feedback | Allowed Render Primitive | |primitiveMode | modes | | | | +-------------------------------------------+---------------------------------------------------+ |GL_POINTS | GL_POINTS | +-------------------------------------------+---------------------------------------------------+ |GL_LINES | GL_LINES, GL_LINE_LOOP, GL_LINE_STRIP, | | | GL_LINES_ADJACENCY, | | | GL_LINE_STRIP_ADJACENCY | +-------------------------------------------+---------------------------------------------------+ |GL_TRIANGLES | GL_TRIANGLES, GL_TRIANGLE_STRIP, GL_TRIANGLE_FAN, | | | GL_TRIANGLES_ADJACENCY, | | | GL_TRIANGLE_STRIP_ADJACENCY | +-------------------------------------------+---------------------------------------------------+ If a geometry shader is present, the output primitive type from the geometry shader must match those provided in the following table: +-------------------------------------------+-------------------------------------------------+ | | | | Transform Feedback | Allowed Geometry Shader | |primitiveMode | Output Primitive Type | | | | +-------------------------------------------+-------------------------------------------------+ |GL_POINTS | points | +-------------------------------------------+-------------------------------------------------+ |GL_LINES | line_strip | +-------------------------------------------+-------------------------------------------------+ |GL_TRIANGLES | triangle_strip | +-------------------------------------------+-------------------------------------------------+ NOTES
Geometry shaders, and the GL_TRIANGLES_ADJACENCY, GL_TRIANGLE_STRIP_ADJACENCY, GL_LINES_ADJACENCY and GL_LINE_STRIP_ADJACENCY primtive modes are available only if the GL version is 3.2 or greater. ERRORS
GL_INVALID_OPERATION is generated if glBeginTransformFeedback is executed while transform feedback is active. GL_INVALID_OPERATION is generated if glEndTransformFeedback is executed while transform feedback is not active. GL_INVALID_OPERATION is generated by glDrawArrays() if no geometry shader is present, transform feedback is active and mode is not one of the allowed modes. GL_INVALID_OPERATION is generated by glDrawArrays() if a geometry shader is present, transform feedback is active and the output primitive type of the geometry shader does not match the transform feedback primitiveMode. GL_INVALID_OPERATION is generated by glEndTransformFeedback if any binding point used in transform feedback mode does not have a buffer object bound. GL_INVALID_OPERATION is generated by glEndTransformFeedback if no binding points would be used, either because no program object is active of because the active program object has specified no varying variables to record. COPYRIGHT
Copyright (C) 2010 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/. AUTHORS
opengl.org opengl.org 06/10/2014 GLBEGINTRANSFORMFEED(3G)
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