Creates a new context in system memory using the memory layout specified by get_screen_core.
memory must contain screen_get_n_planes pointers (usually just
one, but could be as many as 4) of size screen_get_plane_size.
null may also be passed to memory, in which case the memory will be dynamically
allocated.
Likewise, where can be an unused Context (e.g. you may want to do this if you
want a stack allocated context) or it can be null to dynamically allocate a new context.
| w |
the width of the context |
| h |
the height of the context |
| memory |
memory location(s) or null |
| where |
an unused Context struct or null |
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