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Author Topic: [WIP] r_alternateBrightness  (Read 3441 times)
fromhell
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« on: November 09, 2011, 06:49:28 am »

Basically, a technique to simulate the r_overbrightBits screen color adjusting by having a GL_SRC_ALPHA GL_DST_COLOR white plane overlay on the rendering output entirely (even above the console), using overbrightbits' brightness compensation in effect for it, having the brightness cvar adjust its alpha.

PROS:
- Do it in a window!
- Do it on X!!!!!!!!!!!!!!!
- no combines!

CONS:
- it blends. could be expensive on REALLY OLD hardware or even software GL rasterizers
« Last Edit: February 20, 2014, 02:56:01 am by fromhell » Logged

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andrewj
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« Reply #1 on: November 09, 2011, 11:24:31 pm »

That'll just make everything whiter (e.g. black becomes #808080).

If GL_DST_COLOR could be used as the source (i.e. as Cs in the C = CsS + CdD equation) then you'd be adding the framebuffer into itself and getting the same effect as overbrightbits=1, however I'm fairly sure (having checked the OpenGL 1.3 specs) that GL_DST_COLOR is not supported there.

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fromhell
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« Reply #2 on: February 20, 2014, 02:53:15 am »

I actually got around to doing this as well. It works!

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asking when OA3 will be done won't get OA3 done.
Progress of OA3 currently occurs behind closed doors alone

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new code development on github
Suicizer
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« Reply #3 on: February 20, 2014, 03:44:45 pm »

So like bloom and glare screenshaders?
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fromhell
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« Reply #4 on: February 21, 2014, 12:02:37 am »

No.
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asking when OA3 will be done won't get OA3 done.
Progress of OA3 currently occurs behind closed doors alone

I do not provide technical support either.

new code development on github
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