[quake3-bugzilla] [Bug 5979] cubemap support for opengl2

[bugzilla-daemon at icculus.org]

https://bugzilla.icculus.org/show_bug.cgi?id=5979

James Canete <use.less01 at gmail.com> changed:

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--- Comment #3 from James Canete <use.less01 at gmail.com> ---
Created attachment 3384
  --> https://bugzilla.icculus.org/attachment.cgi?id=3384&action=edit
cubemap support and more for opengl2, v3

This will probably be the version I push to github, barring any serious
problems.

New features:
-r_baseGloss and r_baseSpecular.  These two cvars control the gloss and
specular of surfaces that don't specify otherwise.  They default to 0.3 and
0.04, respectively.
-r_specularIsMetallic.  This cvar controls whether the specular texture is the
specular reflectance at normal incidence (0), or if the red channel indicates
metallicness (1).  If r_specularIsMetallic is 1 and the red channel is 1, then
the diffuse texture is used as specular reflectance at normal incidence, and
the diffuse reflectance is set to 0.
-set the fragment program to use world space again, because lighting
calculations weren't correct when the tangent space was non-orthogonal.
-added a simple occlusion hack for deluxe specular and cubemaps, to avoid odd
brightness in dark areas of textures.  This should probably be removed and
replaced with a combination of the ssao and texture ao.
-all lit surfaces use cubemaps now, including models.
-some cleanup

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