This reverts commit 2f964c0a.

This reverts commit b659eb25.

Remove all references to unused shader var global_gamma.

Remove many unused decls for gamma from shaders.

Make post-deferred gamma correction use display_gamma.

Make setting display_gamma use the correct RenderDeferredDisplayGamma setting.

Fix light atten and transmittance calcs breaking ambient color contrib to fog.

Needs to be tested on DRTSIM-415 or better to get legacy viewer settings that match EEP.

Make OpenGL 3.3 cards not false alarm on version 140 shader reqs.
Makes deferred rendering work on low-end GPUs more often.

Given that mShaderObjects only ever expects one copy of a given shader object (leading to lots of "shaderV" and "shaderF"), it made having utility shaders a bit more difficult to incorporate.
This change makes sure the two are separated.  Using this over a multimap largely for readibility.

Also, actually, you know, use this functionality.

--HG--
branch : OPEN-340

Still some work to go here.  Largely related to how certain values (i.e., SSAO mix values) are supplied.  But so far, so good.

--HG--
branch : OPEN-340

'warn-on-failure:no-tabs'

Fix reflection/distortion map culling planes again.

Fix broken handling of shadow disables in ALM forward shaders.

Fix side-effects of having both sun and moon as potential directional light contributors.
We pass an int to the shader indicating which to prefer instead of making per-pixel decisions
and pass the moonlight color/di independently.

Obsolete llsettingssky fade color which was unused elsewhere and cached for no reason.

Fix bug with setting texture matrix for rigged mesh.

Fix z-fighting between sea and sky in ALM by cheating sky, stars, and moon using gl_FragDepth.

Fix handling of atmospheric haze glow w.r.t independent sun/moon positioning
(we can no longer depend on them being mutex to each other).

Eliminate helper GLSL modules depending on further GLSL modules to give Intel HD x000 compiler a fighting chance.

More WIP for edge-specific water shader for 9996.

Prepare for using ifdef to conditionally engage using gl_FragDepth in water shaders
(because GL requires that writing to gl_FragDepth on any path means you need to
 write a depth value on every path).

Further tweaking of directional shadow sampling to balance between peter-panning and shadow acne.

Move stars to just this side of the sky some to reduce parallax.

Remove decodeNormF and uses of decode_normal in favor of unified use of getNorm
(try to help the Intel HD x000 compiler learn to link correctly).

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.

De-duplicate ambient occlusion shader code and move to new aoUtil.glsl

Split shared shadow tap funcs into shadowUtil.glsl

Remove compilation and linkage of deferredUtil and indirect GLSL helper objects (current source of Intel ig4icd driver crash).

Eliminate 20+ callsites with copy-paste of getPosition and/or getNorm code.

Make pipeline use getShadowTarget/releaseShadowTarget consistently.

SL-9973

Give wave direction uniforms more meaningful names in shaders.

Add comments on glow size/focus conversions for clarity.

add cloud_variance control for randomized perturbance of clouds to break up tiling monotony

Add optional moon brightness setting