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2017-06-01ray: move max depth check out of trace_ray()Vito Caputo
We can avoid some unnecessary work at the max depth by checking it in shade_ray() instead.
2017-05-27ray: inline ray_object_* switch functionsVito Caputo
2017-05-27ray: simplify ray_3f_normalize()Vito Caputo
This is functionally identical.
2017-05-27ray: redo ray_3f_distance()Vito Caputo
This function isn't currently used, but its implementation was awful.
2017-05-27ray: normalize direction missed in 28d8022Vito Caputo
Need to normalize the direction when we step the y axis and @ start.
2017-05-27ray: use approximate power in specular reflectionVito Caputo
powf() is slow but precise, this isn't the fastest method but it's at least portable and a bit faster.
2017-05-26ray: s/nlerp/lerp/ where normalize is unnecessaryVito Caputo
It's only necessary to normalize the direction stored vector in x_step(), the rest can simply be linearly interpolated which saves some divides.
2017-05-12ray: mult normalize in ray_object_sphere_normalVito Caputo
Simple optimization taking advantage of the prepare, mults generally are cheaper than divs.
2017-05-12ray: add ray_scene_prepare() object precomputingVito Caputo
Just embed a _prepared struct in the object where precomputed stuff can be cached. Gets called once before rendering, which ends up calling the object-specific ray_object_$type_prepare() methods per object.
2017-04-27*: remove vestigial module/${module}/${module}.hVito Caputo
Prior to rototiller_module_t these headers were included and the module-specific render functions called directly. That's no longer the case, these files are irrelevant today.
2017-04-27sparkler: enable rudimentary threaded renderingVito Caputo
This moves most of the particle system maintenance into the serially executed sparkler_prepare_frame(), divides the frame into ncpus fragments, and leaves the draw to occur concurrently. The drawing must still currently process all particles and simply skips drawing those falling outside the fragment. Moving more of the computation out of prepare_frame() and into render_fragment() is left for future improvements, as it's a bit complex to do gainfully.
2017-04-27sparkler: respect fragment->frame_{width,height}Vito Caputo
should_draw_expire_if_oob() assumed the fragment represented the entire frame. Instead, return 0 if the coordinates are outside the fragment, but only reset longevity if outside of the frame. If sparkler goes threaded in the drawing, this would result in threads simply skipping particles outside the fragment. The longevity reset occurring in all threads appears suspicious but should be benign since they all write the same thing - 0.
2017-04-27fb: apply fragment coordinates put pixel helperVito Caputo
fb_fragment_put_pixel_unchecked() assumed the x,y coordinates of the fragment were always 0.
2017-04-26sparkler: utilize context struct for module stateVito Caputo
2017-04-26sparkler: add virtual flag to particle_props_tVito Caputo
The burst particle abused a zero mass to circumvent the effects of aging. Instead use an explicit virtual flag to suppress aging, change busrt_cb to ignore all virtual particles instead of only its center. Previously burst_cb would thrust other bursts like any other particle, and this was incorrect. Now burst centers are always stationary, even when they overlap other bursts.
2017-04-22roto: utilize context struct for module stateVito Caputo
2017-04-22plasma: utilize context struct for module stateVito Caputo
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.
2017-04-22ray: remove vestigial ray_threads codeVito Caputo
Now that rototiller is generally threaded when a prepare_frame() method is supplied, and modules/ray has been updated accordingly, discard the now redundant ray-specific threading code and related stuff.
2017-04-22ray: convert to generalized threaded renderingVito Caputo
The ray tracer was already threaded, so this required little change other than making some state global like the previous commits, and calling the underlying non-threaded single-fragment scene renderer function. A future commit will discard the now vestigial ray_threads related code.
2017-04-22roto: enable threaded renderingVito Caputo
Same basic changes as the previous commits made to julia and plasma.
2017-04-22plasma: enable threaded renderingVito Caputo
Same general procedure as the previous commit made to the julia module.
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.
2017-04-22rototiller: add threaded renderingVito Caputo
This is a simple worker thread implementation derived from the ray_threads code in the ray module. The ray_threads code should be discarded in a future commit now that rototiller can render fragments using threads. If a module supplies a prepare_frame() method, then it is called per-frame to prepare a rototiller_frame_t which specifies how to divvy up the page into fragments. Those fragments are then dispatched to a thread per CPU which call the module's rendering function in parallel. There is no coupling of the number of fragments in a frame to the number of threads/CPUs. Some modules may benefit from the locality of tile-based rendering, so the fragments are simply dispatched across the available CPUs in a striped fashion. Helpers will be added later to the fb interface for tiling fragments, which modules desiring tiled rendering may utilize in their prepare_frame() methods. This commit does not modify any modules to become threaded, it only adds the scaffolding.
2017-04-22rototiller: add prepare_frame & rototiller_frame_tVito Caputo
Undecided on wether rototiller_frame_t should be fb_frame_t or not, may change later.
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.
2017-04-21sparkler: remove vestigial draw.h from Makefile.amVito Caputo
2017-02-14ray: increase highlight exponent on shiny sphereVito Caputo
The highlight on the little green sphere was white-washing the entire thing due to its high specular reflection value. This produces more reasonable results...
2017-02-14ray: add highlight exponent to ray_surface_tVito Caputo
Was a constant at 20, this allows it to be specified per-object.
2017-02-12ray: tweak surface propertiesVito Caputo
Make spheres a little more diverse in terms of specular/diffusion, and minor tweak to the plane color.
2017-02-12ray: update copyright yearsVito Caputo
2017-02-12ray: improve camera movementVito Caputo
Make the camera orbit around the origin at a varying radius, with kept aimed facing the origin, with some vertical sweep+tilt thrown in.
2017-02-12julia: add a morphing Julia set rendererVito Caputo
This is unoptimized, with a palette slapped together in vim, but still pretty neat!
2017-02-12ray: fixup ray_object_plane_intersects_ray() bugVito Caputo
We should only consider dot products > 0 as intersected, or >= something very close to 0 (epsilon). As-is resulted in planes moving with camera movement along the plane normal axis. Also fixes plane distance to be non-negative in the current scene.
2017-02-12ray: remove vestigial stdio.h includeVito Caputo
Leftover from debugging presumably
2017-02-10ray: implement all orders in ray_euler_basis()Vito Caputo
Originally I only implemented pitch->yaw->roll, and being new to all this didn't fully appreciate the limitation that resulted in. This adds all six permutations of pitch/yaw/roll, the scene must specify the desired order when setting up the camera with the euler angles, see the enum in ray_euler.h.
2017-02-09ray: remove redundant recursion depth incrementVito Caputo
trace_ray() bumps the depth, the reflection ray trace_ray() call just needs to propagate the depth variable not advance it as well. This was probably vestigial from early development and never got taken out. This does mean more reflections now, and correspondingly slower rendering, but it at least makes MAX_RECURSION_DEPTH accurate. The define can be changed if the performance is too bad.
2017-02-09ray: fix mistake in ray:sphere intersection mathVito Caputo
2017-02-08Consolidate fb_fragment_t interactionsVito Caputo
sparkler and stars both cleared fragments and drew individual pixels into fragments, add that functionality to fb.h and cleanup sparkler and stars accordingly.
2017-02-07plasma: add a plasma rendererVito Caputo
2017-02-03*: use fb_fragment_zero() instead of memset()Vito Caputo
2017-02-03fb: add fb_fragment_zero() helperVito Caputo
Currently just a memset wrapper... but maybe could get noop'd if the flipper thread started supporting pre-zeroing pages in its thread, just need a zeroed state in the fb page.
2017-02-03stars: use fb_fragment_put_pixel_unchecked()Vito Caputo
drop draw_pixel() duplication
2017-02-03sparkler: drop draw.hVito Caputo
2017-02-03sparkler: use fb.h put_pixel helpersVito Caputo
discards draw_pixel(), introduces helpers.h and a convenience function for bounds checking and oob extermination. Move makergb to helpers.h, draw.h gets removed in a later commit.
2017-02-03fb: add pixel drawing helpersVito Caputo
Modules seem to be duplicating this, just pull it into fb.h since we're already dependent on the fb.h abstractions in the modules. Slippery slope!
2017-02-03rototiller: extricate draw_pixel() bounds checkingVito Caputo
If a z-buffer is added these checks will need to be done independent from and prior to drawing. Also it's silly to makergb() pixels which can't be drawn.
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