rototiller/.git - Collection of software-rendered graphics hacks supporting libdrm and SDL2

Age	Commit message (Collapse)	Author
2023-09-03	modules/flow: expose speed as a tap	Vito Caputo
	Nothing too crazy here, the speed= setting still controls the speed in lieu of something driving the tap.
2023-09-03	modules/flow: don't reap elements on screen-space exit	Vito Caputo
	This is too aggressive and produces some undesirable visible artifacts on the periphery, especially for slow-moving small-size fields. In such scenarios the elements near the edges would be excessively pruned when the direction wandered off-screen, then leaving an overly sparse region when the direction inevitably wandered back. This is still an issue but it's far less prominent when only clipping to the flow field boundaries... since the FOV doesn't quite encompass the edges of the flow field. Now the elements can survive wandering a bit off-screen, and re-enter.
2023-09-03	modules/flow: add colors	Vito Caputo
	This is a first stab at colorizing the output. The flow field now has two v3f_t datums per cell, direction and color. It's a bit pastel-y and color choice/palettes definitely needs work, at least some gamma correction would make sense. But I kind of like the pastel look actually, some of the combinations start looking very 80s aesthetic. A good way to watch flow's possibilities is: --module=rtv,channels=flow,duration=10,context_duration=10,caption_duration=0 \ --video=sdl,fullscreen=on --defaults --go The long-ish duration really gives a chance to get into the groove of things before switching
2023-09-02	modules/flow: minor cleanup of ff_new()/ff_free()	Vito Caputo
	Simplify ff_new() failure path by using ff_free(), also make ff_free() more ergonomic by returning NULL.
2023-09-02	flow: implement a 3D flow field module	Vito Caputo
	This is kind of a particle system, where the particles are pushed around through a 3D vector space treated as a flow field. No physics are being simulated here, it's just treating the flow field as direction vectors that are trilinearly interpolated when sampled to produce a single direction vector. That direction vector gets applied to particles near it. To keep things interesting the flow field evolves by having two distinct flow fields which the simulation progressively alternates sampling from. For every frame, both flow fields are sampled for every particle, but how much weight is given to the influence of one vs. the other varies by a triangle wave over time. When the weight is biased enough to one of the flow fields near a peak/valley in the triangle wave, the other gets re-populated while its influence is negligible, also interpolating its new values with 25% influence from the active field. The current flow field population routine is completely random. Yet there's a surprising amount of emergent order despite being totally randomized direction vectors. Currently supported settings include: size= the width of the 3D flow field cube in direction vectors (the number of vectors is sizesizesize) count= the number of particles/elements speed= how far a particle is moved along the current sample's direction vector This was first implemented in 2017, but sat unfinished in a topic branch for myriad reasons. Now that rototiller has much more robust settings infrastructure, among other things, it seemed worth finishing this up and merging.