Find histogram min & max values in histogram block consolidation shader.
Display histogram with linear rather than logarithmic scaling.
Make histogram fill entire available horizontal display area.
Use subroutines rather than if statement in shader to control weather gamma transformation is employed.
Fix glDeleteVertexArrays and glDeleteBuffers calls.
Use histogram max bin value found by consolidation shader for scaling of histogram in histogram display vertex shader.
Cache histogram data in the expectation that a feature will be implemented such that the GUI will display bin values as mouse moves over histogram.
Add comments.