During asset processing, no `RPISystem` component is created, so nothing
so nothing calls `ShaderSystem::Init()`, so nothing calls
`ShaderReloadDebugTracker::Init()`. Consequently, the
AZ::EnvironmentVariables that are used during
`ShaderReloadDebugTracker::IsEnabled()` never got created, causing a read
from a nullptr at runtime. This fixes that issue by making `IsEnabled()`
call `CreateVariable()` on the variables it needs if they are not valid.
In addition, it changes the call to `CreateVariable()` to initialize the
variable's values directly, to ensure they are only initialized once. It
also switches to use `AZ::Crc32` so that the variable's id is computed at
compile time.
Signed-off-by: Chris Burel <burelc@amazon.com>
Chris Burel
0e885b8267