glResetHistogram.3G man page
glResetHistogram — reset histogram table entries to zero
void glResetHistogram(GLenum target);
Must be GL_HISTOGRAM.
glResetHistogram resets all the elements of the current histogram table to zero.
glResetHistogram is present only if 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().
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