That's an unfortunate side-effect of how the uniforms are updated currently. All techniques share the same uniform values, but they are updates not once per frame, but once per technique. If a technique is disabled however, the update is skipped (for that technique).
Let's say we have two techniques. Now the following happens:
uniform bool test < source = "key"; keycode = VK_F2; toggle = true; > = true;
technique t1 < enabled = true; toggle = VK_F2; > { ... }
technique t2 < enabled = true; > { ... }F2 is pressed ->
RENDER t1 [DISABLED]
--> SKIP
RENDER t2
--> UPDATE --> test = !test --> false
F2 is pressed ->
RENDER t1 [ENABLED]
--> UPDATE --> test = !test --> true
RENDER t2
--> UPDATE --> test = !test --> false
F2 is pressed ->
RENDER t1 [DISABLED]
--> SKIP
RENDER t2
--> UPDATE --> test = !test --> true
F2 is pressed ->
RENDER t1 [ENABLED]
--> UPDATE --> test = !test --> false
RENDER t2
--> UPDATE --> test = !test --> true
I hope that visualizes the problem.
To fix this I could move the uniform update code to only happen once per frame. This would mean all timers are only updates once per frame too and not between techniques. That might be a problem, but it might as well be not. Performance would sure benefit from this.
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