Finally something a little more interesting than the cube. This alien model is 14,192 triangles and the frame rate is still well above 60 fps (hovers around 650, though I shouldn't fool myself yet, there are lots of improvements I can still make).
I have fixed some of the artifacts in my previous posts. The depth issue where the transparent stuff is always above the rest of the scene is gone now that I render the opaque scene before I render the transparent objects. Along with this, I use a very handy GLSL command layout(early_fragment_tests) in; to discard transparent fragments that fail the depth test before they ever reach the fragment shader. This ensures that transparent fragments that are behind opaque fragments are never processed. Finally I disallowed the transparent pass to write to the depth buffer because otherwise transparent fragments would fail the depth test against other transparent fragments.
There are still a couple of things I would like to do in the next 2 days. First, I still have not coded the linearized approach to OIT (I'm doing the linked list version). Second, I want to put transparency into a mass-instancing program that I did a couple weeks ago. This is where OIT would really shine.
It would be handy to have an option that does not do OIT or any sorting at all to show the artifacts of alpha blending. Also, as we discussed before, we'd like to see the speed/memory vs. visual quality trade-off of varying the maximum number of fragments used per pixel.
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