Skip to content

MPFDMDDisplay

MPFDMDDisplay is a Godot Node class that extends the base MPFDisplay class and is special for hardware DMDs. The class includes special logic for rendering the display, transposing the pixel data, and sending the data back to MPF for delivery to the hardware DMD.

The DMD rendering flow does not use frames-per-second, but instead leverages the Godot engine's rendering system (RenderingService.has_changed()) to trigger display updates. This minimizes serial traffic by only sending new frame data when the frame changes.

Node Configuration

Just like MPFDisplay, all MPFDMDDisplay instances must be first-level child nodes of the main MPFWindow root. The name of the MPFDMDDisplay node is the name of the DMD defined in the MPF config, and can be used in MPF configs as the target: value when targeting a slide or widget to a specific display.

When creating your Window scene, instead of adding an MPFDisplay node add a MPFDMDDisplay node instead. Or if you already have an MPFDisplay node, right-click the node and Change Type... to select MPFDMDDisplay.

Parameters

image

The Godot Editor Inspector panel provides the following parameters for the MPFDMDDisplay node (in addition to all MPFDisplay node parameters):

pixel_order:

Single value. Default: RGB

The order of pixel data (Red, Green, Blue) sent to MPF. If your hardware DMD uses pixels that are RBG or GRB, you will need to set the appropriate value here to get the correct colors.

resolution:

Single value, type: Vector2i. Default: Display node viewport resolution.

This is the physical resolution of the hardware DMD. If specified, the rendered image will be scaled to this resolution for the pixel data sent to MPF (regardless of the size of the display node). If not specified, the display node dimensions will be used.

use_gpu:

Single value. Default: NEVER

Not Yet Implemented

Methods

MPFDMDDisplay does not have any public methods exposed.

Something missing or wrong? You can fix it!

This website is edited by people like you! Is something wrong or missing? Is something out of date, or can you explain it better?

Please help us! You can fix it yourself and be an official "open source" contributor!

It's easy! See our Beginner's guide to editing the docs.

Page navigation via the keyboard: < >

You can navigate this site via the keyboard. There are two modes:

General navigation, when search is not focused:

  • F , S , / : open search dialog
  • P , , : go to previous page
  • N , . : go to next page

While using the search function:

  • Down , Up : select next / previous result
  • Esc , Tab : close search
  • Enter : go to highlighted page in the results