Emulating the GLSL flat qualifier in GLSL 120
I want to emulate flat shading in GLSL shader. I usually do this by passing normal with a flat
classifier to prevent interpolation in the fragment shader. However, flat
not available in GLSL 120.
How can I emulate it without duplicating vertex data? (This is not a premature optimization, but rather a posthumous one.)
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You cannot accurately emulate flat
without direct hardware support (presumably as stated in GLSL 1.30+ support). Previous versions only offer "nothing or nothing": either all attributes are interpolated or not. This means glShadeModel
.
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