slipher

Finally got the modal dialog thing. Turns out it is not implemented for "non-native" dialogs until Qt 6.10. The Debian distro libraries used "native" dialogs so that's why the problem...

Maybe it would be better to just test `slipher/qt6-combined` since I keep forgetting to update the `slipher/qt6` pointer.

> Maybe it would be better to just test `slipher/qt6-combined` since I keep forgetting to update the `slipher/qt6` pointer. Never mind, I don't think it was in there either. Pushed...

Instead of disabling relief mapping, we should disable the depth shader for the affected shader. Depth shaders are not essential to render correctly: see #1412.

Since relief mapping is known to be very expensive, maybe skipping the depth pass could actually be optimal in any case? For an sufficiently expensive shader, the cost of running...

> Another implementation for such lazy loading would just be to render the whole world and all models to some unseen framebuffer in a frame at the end of map...

When using `/glsl_restart`, which currently behaves like `r_lazyShaders 2`, I notice that it can restart very quickly. So it does seem that on a typical map we are not using...

There's a [test](https://source.chromium.org/chromium/chromium/src/+/main:native_client/src/trusted/service_runtime/linux/nacl_bootstrap_prereservation_test.c) that sheds some light on what it's supposed to do. Apparently the `reserved_at_zero` part is only expected to do anything on non-amd64 Linux. One of the duties...

Motion blur uses the depth texture, so this may be related to the texture feedback issues like #1616. We've added some texture barriers now, though AMD + Mesa continues to...

#1816 will add a texture barrier especially for motion blur.