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KodeNerd

Fragment Shaders

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I have been wanting to make some of the effects shown in some books but I just cannot seem to wrap my head around how they work. I think what it is is that I misunderstanding a fundamental portion of fragment shaders. Do they work on each vertex, or do they work on each pixel? Or if those aren't the right answers what exactly do fragment shaders work on (specifically, what are the fragments)?

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Fragment shaders work per pixel, for each interpolated pixel of the polygon which vertex were processed in the vertex shader.

So, at the fragment shader level, the color, the texture coordinates, the z buffer and all other parameters correspond to the pixel.

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