Texture filter modes are kinda funky in OpenGL; there's actually 3 different filters that can be applied:

- Magnification: when a texture is zoomed in.
- Minification: when a texture is zoomed out.
- Mip filter: how the driver selects between different mip levels.

GL_{NEAREST|LINEAR} defines both the magnification and minification filters. If a texture is minified more than 50% it will get aliasing, even with GL_LINEAR.

GL_NEAREST and GL_LINEAR don't use mipmaps. The texture may have miplevels specified for it, but using one of these filters will disable mipmapping and always selects from miplevel 0.

Now, and contrary to what some people believe, software Quake actually did have mipmaps. If you want to replicate the software Quake look, you better use mipmaps.

GL_{NEAREST|LINEAR}_MIPMAP_{NEAREST|LINEAR} filters do use mipmaps, and the filtering mode after the "_MIPMAP_" part specifies how miplevel selection is done. Miplevel selection is not per-vertex in GL, it's per-pixel (per-fragment in more correct GL terminology).

GL_{NEAREST|LINEAR}_MIPMAP_NEAREST just selects the nearest miplevel. This creates a visual artefact where you can quite clearly see the miplevel transition - it's one of those things that might not be immediately obvious but once you do notice it you can't stop seeing it.

GL_{NEAREST|LINEAR}_MIPMAP_LINEAR interpolates between two miplevels and does a good job of hiding miplevel transitions.

Another artefact occurs with surfaces like water and lava: software Quake didn't mipmap those, but if you do, you might notice that the texture shifts between different miplevels as it warps, even though the viewpoint might not otherwise change. The fix to that is to use a shader with the textureGrad instruction, using ddx and ddy from the original unwarped texture coords, and that gives a high quality rock-solid result.

Anisotropic filtering is performed by the hardware, not by software. If your graphics hardware doesn't support anisotropic filtering on GL_NEAREST modes, then it doesn't matter a sweet flying blue damn whether or not the engine provides it as an option: you can't do it.

An alternative is to upscale the original source textures x2 or x4, then run a GL_LINEAR filter; that preserves most of the crunchy pixel look but allows anisotropic filtering. The original textures are so low-res that it won't cause you trouble at all on any reasonably modern hardware. Of course, if you try to do this with a high-res replacement pack your GPU and/or driver might have a heart attack on you.

The other thing to note is that the original low-res textures have a certain pixel-art style that is completely ruined by linear filtering (mag or min, not mip). Look at the details on, say, one of the health pickups and compare the filter modes. The upscaling trick also works well to preserve those details. 

Sorry, but I had to do this just to see if the thread was being revived because of ads... 

I have faith that Baker will return some day. It will be the same day that czg releases honey 2. 

Latest release of Mark V is still capable of running most maps, except for some extreme cases. *IF* Baker ever returns, he should push all limits beyond anything that's currently the max in all other engines, just to make sure future releases will run properly without requiring another engine update.

I'd still like to see the (returned) issues in Nehahra and NE_Ruins fixed, but I'll remind Baker about it once he resurfaces. *IF* he ever resurfaces. 

I will return.

At that point I will likely be a billionaire, just to keep it real that is how it goes down.

So if there aren't Mark V updates right now, I shall leave it you to fill in the blanks, I have other things going on.

People like Shambler who I respect wonder how "it goes down". I never wondered. Perhaps from the perspective of some I only exist to provide chaos.

Don't worry. I will provide that chaos, because I crave it. And if you are a generic peapod, you'll be uncomfortable -- mostly because you have a small "wang" and according to YouTube not everyone can "Wang Chung Tonight".

Ignore my drunk post.

/Cuz like the funny ... against my better discretion I click "Submit'. 

Because he is posting, and when he is sober, he can resume working on his awesome port.

I have been trying QSS lately to see if I can live without Mark V, but then I was missing the different transparency settings for liquids, finetuning for HUD weapon positioning, authentic underwater warp, Nehahra support and so on. Mark V remains number 1 for me and deserves to be perfected to be enjoyed by mankind.

Cheers, mate! 

At least the DX9 build has issues with Quoffee/CoffeeQuake.

When trying to load e3m15_kamp "Unholy Underground", you get a crash to console with following message: "Host_Error: AllocBlock: Full". Happens when you try to load the map directly or after leaving e3m14_pinchy1.