[nolanbaxter]

Off means off, for every scene. A sweep of every feature for work done with nothing to do,
beyond the scenes the last release was measured on: occlusion culling with nothing to cull, the sky
under everything, OIT and depth of field with nothing to show, texture lookups a material does not
have, and an idle character that cost a scene its static fast paths. Each fix A/B'd, the same
pixels. Sponza GPU -8%, -21% with depth of field set; a town of untextured buildings -12% to -24%;
10,000 objects and an idle character, CPU -40%.

Changed

• Off means off, for more than Sponza. A sweep of every feature for work done when it has
  nothing to do; each fix A/B'd on Sponza (with OIT, ambient occlusion or depth of field on) and a
  town of 900 buildings, the same pixels throughout (one channel moved by one level, from grading).
  • Occlusion culling's depth pyramid, second cull and second pass are skipped when every opaque
    mesh is merged, as they are culled by view alone. Sponza: GPU -8%; the town: -13% to -24%.
  • The sky is drawn after the opaque geometry, where nothing covers it, instead of under all of
    it first.
  • With oit on, a frame with nothing blended in view skips its two
    full-screen targets, its pass and its resolve; with it off, the separate blend pass is skipped too.
  • Depth of field whose largest blur is a pixel or less skips its three
    passes: the composite took the sharp colour everywhere. Sponza at f/22 focused at 10 m: GPU -21%.
  • The tonemap skips colour grading's white balance, contrast and saturation when they are neutral.
  • A material with none of the metallic-roughness, normal and occlusion maps skips their lookups
    and the normal map's basis, and one with no emissive map skips that lookup; what they would give
    is known. A town of untextured buildings: main pass -17%, GPU -12%. Textured Sponza: unchanged.
    An untextured surface's normal is now exactly its own: the 1x1 default decoded a hair off flat
    (4 channels in the town's frame moved by up to 2 levels).
  • A skinned or morphed mesh standing still costs what a static one does. A skin's bounds counted
    as changed every frame, posed or not, so one idle character had every frame re-union every
    box in the scene, rewrite every deforming object's draw data and rebuild the shadow casters'
    boxes. Now only a box that changed counts. 10,000 boxes and one idle Fox: CPU -40% a frame;
    the same pixels. Walking, as before.
  • Light clustering runs neither of its passes in a scene with no point or spot lights and no
    decals, once a frame has cleared the counts it leaves.
  • The pass that picks the shadow casters' levels of detail is skipped on frames that draw no
    shadow map.
  • TAA turned off frees its two full-size history images (15 MB at
    720p, 33 MB at 1080p); turned on again, it makes them anew.

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npm install winding-engine

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