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draw stars as circles that get larger as the approach the camera
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- use a context not globals
- use floats and a "unit cube" to simulate the starfield
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Mostly mechanical change, though threads.c needed some jiggering to
make the logical cpu id available to the worker threads.
Now render_fragment() can easily addresss per-cpu data created by
create_context().
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introduces create_context() and destroy_context() methods, and adds a
'void *context' first parameter to the module methods.
If a module doesn't supply create_context() then NULL is simply passed
around as the context, so trivial modules can continue to only implement
render_fragment().
A subsequent commit will update the modules to encapsulate their global
state in module-specific contexts.
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Adding more context to the name in anticipation of adding a prepare_frame()
method to the module struct.
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Make consistent with the source directory structure naming.
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drop draw_pixel() duplication
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Restoring some organizational sanity since adopting autotools.
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