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2019-11-23rototiller: pass cpu to .render_fragment()Vito Caputo
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().
2019-11-23rototiller: pass num_cpus to .create_context()Vito Caputo
Back in the day, there was no {create,destroy}_context(), so passing num_cpus to just prepare_frame made sense. Modules then would implicitly initialize themselves on the first prepare_frame() call using a static initialized variable. Since then things have been decomposed a bit for more sophisticated (and cleaner) modules. It can be necessary to allocate per-cpu data structures and the natural place to do that is @ create_context(). So this commit wires that up. A later commit will probably have to plumb a "current cpu" identifier into the render_fragment() function. Because a per-cpu data structure isn't particularly useful if you can't easily address it from within your execution context.
2019-11-20julia: vary divergent thresholdVito Caputo
This makes the visualization more interesting by adding more variety.
2018-02-27autotools: remove vestigial ROTOTILLER_* varsVito Caputo
Fixes silly cosmetic error in configure output for checking libdrm...
2017-09-15modules/*: cease dividing stride by 4Vito Caputo
Just cast buf to (void *) for the pointer arithmetic, stride is in units of bytes and no assumptions should be made about its value such as divisability by 4.
2017-09-14fb: s/fb_fragment_divide_single/fb_fragment_slice_single/Vito Caputo
Mechanical cosmetic change
2017-09-14*: use fragment generatorVito Caputo
Rather than laying out all fragments in a frame up-front in ray_module_t.prepare_frame(), return a fragment generator (rototiller_fragmenter_t) which produces the numbered fragment as needed. This removes complexity from the serially-executed prepare_frame() and allows the individual fragments to be computed in parallel by the different threads. It also eliminates the need for a fragments array in the rototiller_frame_t, indeed rototiller_frame_t is eliminated altogether.
2017-04-22julia: utilize context struct for module stateVito Caputo
2017-04-22*: add module context machineryVito Caputo
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.
2017-04-22julia: enable threaded renderingVito Caputo
Move maintenance of per-frame variables into julia_prepare_frame(), which requires making them static file-scope globals for now. Also make minor adjustments to the code to make less assumptions about the fragment being rendered (like it's x/y coordinates being 0, etc.) A future commit will probably add an initializer function to rototiller_module_t, with an opaque pointer output which will be fed to all the module methods so these globals can be encapsulated and instantiated.
2017-04-22fb: add frame_{width,height} to fb_fragment_tVito Caputo
Modules need to know the overall dimensions of the frame the fragment they're rendering is part of. Previously it wasn't really necessary since the fragments supplied to the modules had always been the full page, but that's changing. This commit also changes the julia module to use the frame dimensions, others will need updating as well.
2017-04-22*: /render/render_fragment/ in rototiller_module_tVito Caputo
Adding more context to the name in anticipation of adding a prepare_frame() method to the module struct.
2017-04-21*: s/renderer/module/gVito Caputo
Make consistent with the source directory structure naming.
2017-02-12julia: add a morphing Julia set rendererVito Caputo
This is unoptimized, with a palette slapped together in vim, but still pretty neat!
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