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glResetHistogram - reset histogram table entries to zero 
 
void
glResetHistogram( GLenum target ) 
 
- target 
- Must be GL_HISTOGRAM. 
glResetHistogram resets
all the elements of the current histogram table to zero. 
glResetHistogram
is present only if GL_ARB_imaging is returned when glGetString is called
with an argument of GL_EXTENSIONS. 
GL_INVALID_ENUM is generated if
target is not GL_HISTOGRAM.
GL_INVALID_OPERATION is generated if glResetHistogram
is executed between the execution of glBegin and the corresponding execution
of glEnd. 
glHistogram(3G)
 
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