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Full Discussion: issue with if loop in perl
Top Forums Shell Programming and Scripting issue with if loop in perl Post 302156389 by cbkihong on Tuesday 8th of January 2008 04:10:43 AM
Old 01-08-2008
Can you transform your posted code to a complete program that demonstrates just the issue while being short, so that others can copy onto their systems to run and trace. Without seeing the content of the variables, it is impossible for anyone to help you debug.

And you have not even mentioned in what way the else part is not working. It's not running as expected? It is being executed in a wrong way? So, be specific with what you are expecting.
 

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LEARN ABOUT MOJAVE

glbegintransformfeedback

GLBEGINTRANSFORMFEED(3G)					    OpenGL 3.3						  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/.

OpenGL 3.3							    03/08/2011						  GLBEGINTRANSFORMFEED(3G)
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