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Pasting Together A Function

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I''m writing a software 3d engine and I thought maybe instead of having a bunch of if statements to check if the polys should be shaded, textured, blended, etc each time I call my DrawScanline function, I could somehow use a bunch of small functions with specific tasks to create one large function to draw the scanline without any if''s(and hopefully it''ll run faster...). I heard of a way to do this using assembly... but I don''t know any assembly and would that have to be processor specific? Is there a way to do this without using assembly?

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