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Having only recently started learning the ‘new’ OpenGL (programmable as opposed to fixed-function, I learned from the Nehe Tutorials), I’m wondering if learning OpenGL 3 is at all useful since OpenGL 4 was released.
The reason I ask is because I’m wondering as to the number of machines able to use OpenGL 4.
Is it widely adopted currently, do most graphics cards support it? Is OpenGL 4 even radically different from OpenGL 3?
OpenGL 4 is not radically different from OpenGL 3. It supports binary shaders and 64-bit data types and some other things, but nothing that makes your OpenGL 3 apps immediately obsolete.