Geometry Vibes 3D Port - R-Pi Pico 1@35 FPS!

Kuratius · March 24, 2026, 11:59pm

Could memset like this be replaced by dma?

github.com/KeithDobbelaere/GeometryVibes3D-PicoCalc

src/platform/pico/Ili9488Display.cpp

70388592b


      
                      const uint16_t idx = f.lineSlabCursor[s];
                      if (idx < f.lineSlabOffset[s + 1] && idx < MAX_LINES_BINNED) {
                          f.lineSlabIndices[idx] = (uint16_t)i;
                          f.lineSlabCursor[s] = (uint16_t)(idx + 1);
                      }
                  }
              }
          }
          
          void Ili9488Display::binFrameFillRects(Frame& f) {
              std::memset(f.fillRectSlabCount, 0, sizeof(f.fillRectSlabCount));
              f.fillRectBinnedTotal = 0;
          
              for (int i = 0; i < f.fillRectCount; ++i) {
                  const FillRectInst& r = f.fillRects[i];
          
                  const int x0 = r.x;
                  const int y0 = r.y;
                  const int x1 = x0 + r.w - 1;
                  const int y1 = y0 + r.h - 1;

Keith_Dobbelaere · March 25, 2026, 12:54am

I don’t know, but NUM_SLABS is only 40 at most, and all we’re doing is zeroing it out. All the binning is Core0, anyway. I’ve made a test branch and pushed the changes I tried earlier—no dice, unfortunately. I have collision detection disabled on the latest commit, as well. If you want to try it for yourself, change GV_TEST to 1.

Keith_Dobbelaere · March 25, 2026, 1:29am

I was able to smooth things out for Core1 by marking renderAndFlushFrame() as __no_inline_not_in_flash_func. No more spikes on the debug output for Core1.

Keith_Dobbelaere · March 25, 2026, 2:37am

After this and a modest overclock, thanks to Geoff, it’s running smoother than ever. I’m having so much fun with this thing. And thank you too, Kuratius. I never would have Googled for that macro if you hadn’t mentioned putting code in memory.

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Geometry Vibes 3D Port - R-Pi Pico 1@35 FPS!

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