Defining MEM_DEBUG in mem.h will add a size field to Alloc and enable
bounds and alignment checks for every memory read and write.
Notes:
- Deriving an Alloc from Path.tiles is unsound, but it's more trouble to
convert Path.tiles from TileRef to a variable sized Alloc.
- elements.comp note that "We should be able to use an array of structs but the
NV shader compiler doesn't seem to like it". If that's still relevant, does
the shared arrays of Allocs work?
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Merge all static and dynamic buffers to just one, "memory". Add a malloc
function for dynamic allocations.
Unify static allocation offsets into a "config" buffer containing scene setup
(number of paths, number of path segments), as well as the memory offsets of
the static allocations.
Finally, set an overflow flag when an allocation fail, and make sure to exit
shader execution as soon as that triggers. Add checks before beginning
execution in case the client wants to run two or more shaders before checking
the flag.
The "state" buffer is left alone because it needs zero'ing and because it is
accessed with the "volatile" keyword.
Fixes#40
Signed-off-by: Elias Naur <mail@eliasnaur.com>
