03-04-2015
Could you post the exact output from your terminal from both the successful and the failing execution?
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LEARN ABOUT DEBIAN
glbeginconditionalrender
GLBEGINCONDITIONALRE(3G) [FIXME: manual] GLBEGINCONDITIONALRE(3G)
NAME
glBeginConditionalRender - start conditional rendering
C SPECIFICATION
void glBeginConditionalRender(GLuint id, GLenum mode);
PARAMETERS
id
Specifies the name of an occlusion query object whose results are used to determine if the rendering commands are discarded.
mode
Specifies how glBeginConditionalRender interprets the results of the occlusion query.
C SPECIFICATION
void glEndConditionalRender(void);
DESCRIPTION
Conditional rendering is started using glBeginConditionalRender and ended using glEndConditionalRender. During conditional rendering, all
vertex array commands, as well as glClear() and glClearBuffer() have no effect if the (GL_SAMPLES_PASSED) result of the query object id is
zero, or if the (GL_ANY_SAMPLES_PASSED) result is GL_FALSE. The results of commands setting the current vertex state, such as
glVertexAttrib() are undefined. If the (GL_SAMPLES_PASSED) result is non-zero or if the (GL_ANY_SAMPLES_PASSED) result is GL_TRUE, such
commands are not discarded. The id parameter to glBeginConditionalRender must be the name of a query object previously returned from a call
to glGenQueries(). mode specifies how the results of the query object are to be interpreted. If mode is GL_QUERY_WAIT, the GL waits for
the results of the query to be available and then uses the results to determine if subsequent rendering commands are discarded. If mode is
GL_QUERY_NO_WAIT, the GL may choose to unconditionally execute the subsequent rendering commands without waiting for the query to complete.
If mode is GL_QUERY_BY_REGION_WAIT, the GL will also wait for occlusion query results and discard rendering commands if the result of the
occlusion query is zero. If the query result is non-zero, subsequent rendering commands are executed, but the GL may discard the results of
the commands for any region of the framebuffer that did not contribute to the sample count in the specified occlusion query. Any such
discarding is done in an implementation-dependent manner, but the rendering command results may not be discarded for any samples that
contributed to the occlusion query sample count. If mode is GL_QUERY_BY_REGION_NO_WAIT, the GL operates as in GL_QUERY_BY_REGION_WAIT, but
may choose to unconditionally execute the subsequent rendering commands without waiting for the query to complete.
NOTES
glBeginConditionalRender and glEndConditionalRender are available only if the GL version is 3.0 or greater.
The GL_ANY_SAMPLES_PASSED query result is available only if the GL version is 3.3 or greater.
ERRORS
GL_INVALID_VALUE is generated if id is not the name of an existing query object.
GL_INVALID_ENUM is generated if mode is not one of the accepted tokens.
GL_INVALID_OPERATION is generated if glBeginConditionalRender is called while conditional rendering is active, or if glEndConditionalRender
is called while conditional rendering is inactive.
GL_INVALID_OPERATION is generated if id is the name of a query object with a target other than GL_SAMPLES_PASSED or GL_ANY_SAMPLES_PASSED.
GL_INVALID_OPERATION is generated if id is the name of a query currently in progress.
SEE ALSO
glGenQueries(), glDeleteQueries(), glBeginQuery()
COPYRIGHT
Copyright (C) 2009 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/.
[FIXME: source] 05/30/2012 GLBEGINCONDITIONALRE(3G)