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2018-02-22sdl_fb: implement rudimentary sdl fb backendVito Caputo
This uses a simple fixed 640x480 windowed mode (for now). The SDL2 Renderer & Texture API is used for vsync-synchronized presents. There's probably excessive copying going on because the rototiller fb code manages pages and flips but SDL2 doesn't really expose low-level control of such things. This backend is quite useful for development purposes, allowing quick iteration in a windowed environment. Note this is just the backend implementation, it's dormant code but trivially activated.
2018-02-22*: embrace new generic settings paradigmVito Caputo
This should probably be split into multiple commits, but for simplicity sake it's all cut over at once. drm_fb.c sees major changes, migrating the remaining drm-specific bits from drmsetup into it, behind the settings API. rototiller.c sees a bunch of scaffolding surrounding the settings API and wiring it up into the commandline handling and renderers and video backends. fb.[ch] see minor changes as settings get plumbed to the backend drmsetup.[ch] goes bye bye
2018-02-20setup: add simple stdio setup_interactively()Vito Caputo
Preliminary means for interactively configuring settings and defaults
2018-02-20rototiller: rudimentary argv parsing scaffoldingVito Caputo
Nothing wired up yet.
2018-02-20settings: introduce abstract settingsVito Caputo
Settings will be used to express configurable parameters in the rendering modules and fb backends. The goal is to address both commandline argument setting of parameters, automatic use of defaults, as well as interactive configuration including the outputting of the resulting settings in a form usable as a commandline for future reuse. Since settings can be numerous and highly varied from one module or backend to another, a form similar to the Linux kernel's cmdline or QEMU's approach has been adopted. For example, a complete DRM backend, card selection and config would be: rototiller --video=drm,dev=/dev/dri/card0,connector=LVDS-1,mode=1024x768@60 If any of the above were omitted, then the missing settings would be interactively configured. If you added --defaults, then any omissions would be automatically filled in with the defaults. i.e. rototiller --video=drm,dev=/dev/dri/card4 --defaults would use the preferred connector and mode for that card. rototiller --video=drm --defaults would do the same but also default to the /dev/dri/card0 path. for brevity, I omitted rendering modules from above, but the same approach applies simply to --module=: rototiller --module=sparkler --video=drm --defaults If you ran rototiller without any arguments, then a fully interactive setup would ensue for module and video. If you ran rototiller with just --defaults, then everything is defaulted for you. A default rendering module will be used (the original roto renderer, probably). Note that this commit only adds scaffolding to make this possible, none of this is wired up yet.
2018-01-01fb: switch over to fb_ops_t abstractionVito Caputo
Remove everything drm-related from fb.c, utilizing the implementation in drm_fb.c instead.
2018-01-01drm_fb: implement drm fb backendVito Caputo
Largely mechanical copying of the drm code into the new fb_ops_t abstraction. Dormant for now.
2018-01-01fb: introduce fb_ops_tVito Caputo
Hooks for fb acquire/release, page allocate, free, and flip. This should encompass everything currently needed for the drm backend, which will move behind this abstraction in a later commit.
2017-12-31fb: combine page flip with waitVito Caputo
Tidying this up a bit in preparation of ripping out all drm-specific stuff from fb.[ch]. Future commits will refactor fb.c to utilize an fb_ops_t for hooks to allocate, flip, and free pages.
2017-12-23ray: constify input scene and camera parametersVito Caputo
also const the ray_euler_t basis
2017-12-23ray: constify all ray_3f_t method parametersVito Caputo
2017-12-23ray: split object render from object descriptionVito Caputo
This moves the per-object _prepared state into ray_render_object_$type structs with all the rendering-related object methods switched to operate on the new render structs. Since the current rendering code just makes all these assumptions about light objects being point lights, I've just dropped all the stuff associated with rendering light objects for now. I think it will be refactored a bit later on when the rendering code stops hard-coding the point light stuff. These changes open up the possibility of constifying the scene and constituent objects, now that rendering doesn't shove the prepared state into the embedded _prepared object substructs.
2017-12-10ray: split scene data from render stateVito Caputo
This introduces ray_render_t, and ray_render.[ch]. The _prepared member of ray_scene_t has been moved to ray_render_t, and the other _prepared members (e.g. objects) will follow. Up until now I've just been sticking the precomputed state under _prepared members of their associated structures, and simply using convention to enforce anything resembling an api boundary. It's been convenient without being inefficient, but I'd like to move the ray code into more of a reusable library and this wart needs to be addressed. The render state is also where any spatial indexes will be built and maintained, another thing I've been experimenting with. Note most of the churn here is just renaming ray_scene.c to ray_render.c. A nearly global s/ray_scene/ray_render/ has occurred, now that ray_scene_t really only serves as glue to bind objects, lights, and scene-global properties into a cohesive unit.
2017-12-10rototiller: introduce module.finish_frame()Vito Caputo
Add a hook for post-render serialized frame completion, some of the renderers may have state to cleanup after rendering a frame. A future commit may change add a return value to control flow for features like multi-pass rendering within a given module. The raytracer for example may want to add concurrently executed post filters, and having a non-void return from finish_frame() would be a tidy way to tell rototiller "go back to prepare->render for this context" as many times as necessary, keeping the pass state in the context. For now its return is void however, as I just need a cleanup hook as the raytracer becomes more stateful per frame with a BIH spatial index in the works.
2017-12-10ray: add module context ray_context_tVito Caputo
Before I can clean up the ray_scene_t._prepared kludge I need a place to keep state from frame prepare to render, enter context. Future commits will migrate the _prepared stuff into a separate ray_render_t which is constructed on prepare then acted on in fragment render. Then spatial acceleration structures may be added, constructed at prepare phase and shared across the concurrent rendering.
2017-12-10ray: trivial formatting changesVito Caputo
Remove some extraneous indentation
2017-09-29ray: remove unused ray_scene_t.n_{lights,objects}Vito Caputo
Commit 445e94 switched to using sentinel objects, but missed removal of these obsoleted object counts.
2017-09-17ray: stop recurring below a relevance thresholdVito Caputo
There's no point computing more reflections if they're not going to contribute substantially to the resulting sample. Previously the max depth threshold solely controlled how many times a given ray could reflect, this commit introduces a minimum relevance as well. Value may require tuning, may actually make sense to move into the scene description as a parameter. Brings a minor frame rate improvement.
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: update copyright lineVito Caputo
2017-09-14fb: s/fb_fragment_divide_single/fb_fragment_slice_single/Vito Caputo
Mechanical cosmetic change
2017-09-14ray: switch to the tiling fragmenterVito Caputo
2017-09-14fb: implement a tiling fragmenterVito Caputo
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.
2017-09-14util: add MIN/MAX macrosVito Caputo
2017-09-14ray: simplify object iterators using sentinel typeVito Caputo
Trivial optimization eliminates some instructions from the hot path, no need to maintain a separate index from the current object pointer.
2017-09-13ray: cleanup ray_camera_frame_t fragmentsVito Caputo
Previously every fb_fragment_t (and thus thread) was constructing its own ray_camera_frame_t view into the scene, duplicating some work. Instead introduce ray_camera_fragment_t to encapsulate the truly per-fragment state and make ray_scene_render_fragment() operate on just this stuff with a reference to a shared ray_camera_frame_t prepared once per-frame. Some minor ray_camera.c cleanups sneak in as well (prefer multiply instead of divide, whitespace cleanups...)
2017-09-12ray: don't assume x_alpha is 0 at begin or y_stepVito Caputo
Currently fragments always start at the left edge of the frame, but when switching to a tiling fragmenter this is no longer true and causes visible errors.
2017-08-15ray: misc computational fixupsVito Caputo
ray:object intersection coordinates were incorrectly being computed relative to the ray origin using a subtraction instead of addition, a silly mistake with surprisingly acceptable results. Those results were a result of other minor complementary mistakes compensating to produce reasonable looking results. In the course of experimenting with an acceleration data structure it became very apparent that 3d space traversal vectors were not behaving as intended, leading to review and correction of this code.
2017-08-07rototiller: remove unused variableVito Caputo
2017-08-07ray: more fragments for better thread utilizationVito Caputo
For now, a simple cpu multiplier of 64 is used. fb_fragment_t needs a tiling fragment divider added...
2017-08-07threads: rework threaded fragment schedulingVito Caputo
Instead of creating fragment lists striped across available threads uniformly in a round-robin fashion, just have the render threads iterate across the shared fragments array using atomics. This way non-uniform cost of rendering can be adapted to, provided the module prepares the frame with sufficient fragment granularity. In the ray tracer for example, it is quite common for some areas of the screen to have lower complexity/cost than others. The previous model distributed the fragments uniformly across the threads with no ability for underutilized threads to steal work from overutilized threads in the event of non-uniform cost distributions. Now no attempt to schedule work is made. The render threads simply race with eachother on a per-frame basis, atomically incrementing a shared index into the frame's prepared fragemnts. The fragment size itself represents the atomic work unit. A later commit will change the various renderers to prepare more/smaller fragments where appropriate. The ray tracer in particular needs more and would probably further benefit from a tiling strategy, especially when an acceleration data structure is introduced.
2017-06-03ray: convert from recursive to iterative tracingVito Caputo
Small speedup, I personally find the code cleaner this way too. Everything in the hot path should now be inlined, no function calls.
2017-06-02ray: skip intersection tests on reflector objectsVito Caputo
We can just assume the object which reflected the ray being tracing isn't going to be intersected. Maybe later this assumption no longer holds true, but it is true for now.
2017-06-02ray: precompute primary ray for ray_object_sphere_tVito Caputo
This gets rid of some computation on the primary ray:plane intersection tests The branches on depth suck though... I'm leaning towards specialized primary ray intersection test functions.
2017-06-02ray: precompute primary ray for ray_object_plane_tVito Caputo
This gets rid of some computation on the primary ray:plane intersection tests
2017-06-02ray: plumb depth and camera to objectsVito Caputo
To enable prepare to precompute aspects of primary rays which all have a common origin at the camera, bring the camera to ray_object*_prepare() and bring the depth to ray_object*_intersects_ray() for primary ray detection. This is only scaffolding, functionally unchanged.
2017-06-02ray: separate lights from objectsVito Caputo
This may need to be undone in the future when more sophisticated lights, like area lights, are implemented. For now I can avoid polluting the objects list with the lights by strictly separating them.
2017-06-02ray: simplify trace_ray inner loop slightlyVito Caputo
Remove unnecessary nearest_object check, the distance comparison alone is sufficient when initialized to INFINITY.
2017-06-01ray: move shadow check to a functionVito Caputo
Just tidying up shade_ray() before more optimizations.
2017-06-01ray: perform ambient light color scale in prepareVito Caputo
Trivially removes a ray_3f_mult_scalar() from the hot path.
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.
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