lots of fixes and additions

Make rend2 build and work on linux

Also took the chance to refactor some orthographic rendering code

Rend2

Begin/end scene when rendering weather depth map

Since we're building up viewParms ourselves, there's no need to set up
anything in the refdef

assigned

Hotfix material system

Rend2 update

- added r_deluxeSpecular like SmileTheroy did in ioq3
- fixed the ambient term in lightall for lightmaps

Deluxemapping update

Credit to @SomaZ for creating this fix!

Uniforms where never initialized for the dglowDownsample shader, thous
it never got the size of the image that should be processed. The result
was that the shader read the same pixel over and over again instead of
gathering multiple ones for smoothing out the output image.

Update to latest Rend2

Fixes xycaleth#21

Fixes xycaleth#25

Fixes xycaleth#43

Credits to Bucky for finding it.

Just for completeness

Based on ioq3s implementation with some additions and fixes

This basically broke all animations that have a negative animation
speed. numFramesInAnim is computed by endFrame - startFrame so it's
negative in this case.

Thanks to @Bucky21659 for creating this fix

+ some cleanup

See https://stackoverflow.com/questions/22984956/tellg-function-give-wrong-size-of-file/22986486 for more information.

The vanilla renderer forces the alpha value for entities with RF_FORCE_ENT_ALPHA. Since the evaulation is vertColor * attr_Color + baseColor we can force the alpha with setting vertColor 0.0 and the baseColor to the value we want to force for the whole model.

see JACoders@8367be0

see xycaleth@cbf0a16

based on:
https://github.com/xycaleth/OpenJK/tree/rend2-dev/shader-constants

Just batched entity ubos and just commit complete skeletons, not just parts.

Also fixing shell effects and disintegration.

The world entity is not present in backend.refdef.entities, so you have to point the refEntity directly to tr.worldEntity.

Added dlights back, added sprites to the shader constants and fixed sunlight shadows in cubemaps.

Loads external Lightmaps like the vanilla openjk renderer
Also loads radiance hdr lightmaps now
Removed r_srgb

Removed SWIZZLE_NORMALMAP earlier, which caused trouble in the shader.

Just to enable non explicit shaders to use those maps too.

…tants-new

Update lightall.glsl

It generates a stage per lightstyle, based on a collapsed stage, now. Should also be able to read a deluxe map per lightstyle now.

- parallaxBias can be used per material stage
- r_forceParallaxBias can be used for previewing

Now only collapsable shaders swap lightmap and diffuse stage. Support shaders with lighting specular. Excluding them from beeing collapsed doesnt make any sense to me. Fixes a rare case of strange looking lightstyles. Don't collapse environment mapped stages. Never seen anybody using it for materials besides reflections.

Also fixed a bad in the parallax code

Reworked parallax a bit, fixed some other issues

- rgbGen const now is a float that isn't capped at 1.0
- removed stupid cheap bloom which I accidentally committed
- fixed color space of images on hdr lit maps

Should have used Fd for multiplying with the ambient before, but it doesnt play well with the cloth shader. So, we simply dont mutiply/divide by pi at all for ambient.

The renderer postprocessed the rendered skyportal which led to problems regarding tonemapping and other faulty things because it didnt happen.

nothing finished, don't use yet

Skipping these will result in wrong shaders. My bad.

Oversight in my last commit.

Mainly to support Szico VII to build his beach map without having to fix this mess properly for now.