diff options
| author | Vito Caputo <vcaputo@pengaru.com> | 2025-06-15 15:09:30 -0700 |
|---|---|---|
| committer | Vito Caputo <vcaputo@pengaru.com> | 2025-06-15 15:09:30 -0700 |
| commit | c061faad2270937ff3223c90e783e3f1dceff5d7 (patch) | |
| tree | 54c3ed91f4cedd641d0b09fb1291ed34c670cff9 /src | |
| parent | 60157752d9cb030b8545f8cde93b13813c621fd5 (diff) | |
modules/julia: advance context when ticks changes
This is a kludge to prevent major divergence of julia contexts
that get rendered different numbers of times in a given frame.
This is easily triggered using julia as a fill_module in
checkers.
See the added TODO for what should *really* be done here.
Diffstat (limited to 'src')
| -rw-r--r-- | src/modules/julia/julia.c | 45 |
1 files changed, 28 insertions, 17 deletions
diff --git a/src/modules/julia/julia.c b/src/modules/julia/julia.c index 82c899f..25f9d80 100644 --- a/src/modules/julia/julia.c +++ b/src/modules/julia/julia.c @@ -112,23 +112,34 @@ static void julia_prepare_frame(til_module_context_t *context, til_stream_t *str *res_frame_plan = (til_frame_plan_t){ .fragmenter = til_fragmenter_slice_per_cpu_x16 }; - ctxt->rr += .01; - /* Rather than just sweeping creal,cimag from -2.0-+2.0, I try to keep things confined - * to an interesting (visually) range. TODO: could certainly use refinement. - */ - ctxt->realscale = 0.01f * cosf(ctxt->rr) + 0.01f; - ctxt->imagscale = 0.01f * sinf(ctxt->rr * 3.0f) + 0.01f; - ctxt->creal = (1.01f + (ctxt->realscale * cosf(1.5f * M_PI + ctxt->rr) + ctxt->realscale)) * cosf(ctxt->rr * .3f); - ctxt->cimag = (1.01f + (ctxt->imagscale * sinf(ctxt->rr * 3.0f) + ctxt->imagscale)) * sinf(ctxt->rr); - - /* Vary the divergent threshold, this has been tuned to dwell around 1 a bit since it's - * quite different looking, then shoot up to a very huge value approaching FLT_MAX which - * is also interesting. - */ - ctxt->threshold = cosf(M_PI + ctxt->rr * .1f) * .5f + .5f; - ctxt->threshold *= ctxt->threshold * ctxt->threshold; - ctxt->threshold *= 35.f; - ctxt->threshold = powf(10.f, ctxt->threshold); + if (ticks != context->last_ticks) { + /* TODO: this cumulative state in the context is problematic. + * It'd be better to absolutely derive this from ticks every prepare, so we could do things like + * rewind and jump around by changing ticks. As-s, this is assuming rr advances a constant rate + * in a uniform direction. + * To behave better in multi-render situations like as a checkers fill_module, this was all made + * conditional on ticks differing from context->last_ticks, so it would at least suppress accumulating + * more movement when rendered more times in a given frame... but it should just all be reworked. + * roto has the same problem, these asssumptions are from a simpler time. + */ + ctxt->rr += .01; + /* Rather than just sweeping creal,cimag from -2.0-+2.0, I try to keep things confined + * to an interesting (visually) range. TODO: could certainly use refinement. + */ + ctxt->realscale = 0.01f * cosf(ctxt->rr) + 0.01f; + ctxt->imagscale = 0.01f * sinf(ctxt->rr * 3.0f) + 0.01f; + ctxt->creal = (1.01f + (ctxt->realscale * cosf(1.5f * M_PI + ctxt->rr) + ctxt->realscale)) * cosf(ctxt->rr * .3f); + ctxt->cimag = (1.01f + (ctxt->imagscale * sinf(ctxt->rr * 3.0f) + ctxt->imagscale)) * sinf(ctxt->rr); + + /* Vary the divergent threshold, this has been tuned to dwell around 1 a bit since it's + * quite different looking, then shoot up to a very huge value approaching FLT_MAX which + * is also interesting. + */ + ctxt->threshold = cosf(M_PI + ctxt->rr * .1f) * .5f + .5f; + ctxt->threshold *= ctxt->threshold * ctxt->threshold; + ctxt->threshold *= 35.f; + ctxt->threshold = powf(10.f, ctxt->threshold); + } } |