opengl: fix matrix dimensions convention
A m×n matrix contains m rows and n columns.
My usage (m columns and n rows) did not match the common convention, so what I called 3x2 matrices were in fact 2x3 matrices.
A m×n matrix contains m rows and n columns.
My usage (m columns and n rows) did not match the common convention, so what I called 3x2 matrices were in fact 2x3 matrices.
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