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Tweak application of shadow bias to balance between shadow acne and Peter-panning
by using light_dir z value, per-split bias multiplier, and better jitter noise method.
Also tweak impl of spot shadow sampling func to work around issues with Intel HD shader compiler
which crashes with Intel HD 3000 driver 4459 due to shadow map array access with index using math (kwality).
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Fix positioning of sun/moon discs w.r.t atmo haze glow.
Disable killing glow when sun is not up.
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Modify sun disc shader to better position itself within the sun glow and to
fade as the sun approaches the horizon (to mask where the position difference is greatest).
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SL-9851
Fix cloud shaders to ignore clouds when cloud_scale is 0.
Fix creation of heavenly body geo to avoid degenerate vector math
and not randomly flip orientation when crossing zenith.
Add sun_up_factor to eliminate sun glow around moon when sun is down.
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Use clamp on dot product of view and light norm to eliminate 2nd halo.
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Use clamping on dot product to determine halo TCs to fix abrupt cutoff at dot == 0.
Ifdef around engaging advanced atmo which is not ready for primetime yet.
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Fix OSX shader compile bug from use of #if FOO instead of #ifdef FOO or #if defined(FOO)
preventing atmospherics (and thus ALM) from working on OSX.
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Fix handling of backfaces in shared shadow sampling broken during de-duplication.
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SL-10355
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Modify distortion vec calc in shader to account for modified range of reflection scale above/below.
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Clean up deferred\alpha shader to allow re-entrant graphics switching (link error on 2nd compile/link of deferred shaders).
Clean up some uses of pragma(optimize,...).
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non-ALM lighting.
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next textures are identical.
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blocks in several shaders).
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Add new class3 shadow shaders for VSM shadows.
Add disabled shadow pass in WLSky for using above.
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atten args.
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De-duplicate ambient occlusion shader code and move to new aoUtil.glsl
Split shared shadow tap funcs into shadowUtil.glsl
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Modify handling of directional light to prefer sun when it is up but use moon dir/color when it is alone in the sky.
Modify handling of shader in shaders to get some shadowing of ambient and nighttime shadowing.
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Plug more holes through which env ambient terms were finding their way into lighting calcs for HUDs.
Fix up mismatched indenting (tabs v spaces) on several shaders.
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Fix fullbright transport transposed args and use display gamma for post-deferred gamma correction.
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lighting pipe.
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Fix class 1 and 2 transport/gamma funcs and made usage consistent across all shaders.
Fix class1\environment\waterV reverting to old d1/d2 names for wave directions.
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Eliminate 20+ callsites with copy-paste of getPosition and/or getNorm code.
Make pipeline use getShadowTarget/releaseShadowTarget consistently.
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lighting shaders.
Also fix terrain response to atmospherics shaders (was failing to apply ambient on low end even when atmospherics was on).
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Make shaders use consistent naming and parameter order for transport and atmospheric helpers.
Share transport and gamma correction code where possible.
Add lots of asserts and other validation for when things don't go as planned.
Engage dumpShaderSource to get more source output with shader compilation fail.
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extraneous GL state management.
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Port over transport, gamma, atmospherics shader stub updates for per-fragment atmospherics.
Fix bindings of current/next noise map when current and next are the same (select only one and force blend factor to 0).
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Get dome rendering to not assert the depth test state behind deferred render's back.
Make clouds write and test depth to give stars something to depth test against.
Add z-bias in star vert shader to force some depth testing of stars against clouds.
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De-hackify WL additive to get better match between ALM and non-ALM rendering
without bringing back SL-1491 lens flare bug.
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helper funcs.
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Give wave direction uniforms more meaningful names in shaders.
Add comments on glow size/focus conversions for clarity.
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density tab.
Make frag shader version of vert WL shader to include rainbow/halo effect in non-advanced WL sky.
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add cloud_variance control for randomized perturbance of clouds to break up tiling monotony
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