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modular-2d-engine.md

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Design of a modular 2D art engine, like a virtual analog video synth

Render

the target output may be of two types:

  • vector
  • raster

Vector outputs possess the following instructions:

  • set phosphor decay time (the "disintegration constant" of phosphors, how long phosphors decay according to an exponential law, from a given energy level to a residual energy level)
  • set beam power: define exciter beam intensity from 0% to 100%
  • move beam: move beam from its current position to its next position, linearly, in a cartesian system
  • move beam Bézier N: move beam according to a Bézier curve with N points starting from the current position and ending at the Nth point, in a cartesian system
  • move beam in a polar system: move beam to another position in a polar system, varying angle and radius on 2 [0, 1] gradients
  • blank screen: force all phosphors to lose their energy very fast (instantaneously)

Raster outputs are driven like a CRT, they obey clock modeline parameters and are driven by a composite, component or RGB signal:

  • RGB is RGBHV
  • Component is Y Cb Cr or YUV
  • Composite is (NTSC) CVBS with or without luma signals (without luma signals it will be monochromatic)

In our system, the outputs are rendered into digital higher-resolution bitplanes that may be displayed or conveyed to other systems. Outputs may also be stacked and merged.

Geometries

Geometries are objects designed to be rendered on a vector display

Filters

Filters are transformations applied to a raster output. For example, they could set a hue to a signal, reduce intensity,