QtCS2018 Graphics Vision 2020

Laszlo presented the current 5.11 graphics diagram and vision diagram as discussion starting point.

Qt .511

• Qt 3D Studio 2.0 runtime is now built on Qt 3D.
  • This means we have a 3D scene graph that is mainted by the runtime.
  • Qt 3D is still available for use.
• On Qt Quick 2 side we have Qt Quick Scenegraph.
  • One mistake we did in Qt 5 was to depend on OpenGL and exposing shader coding directly as GLSL.
• You can use OpenGL texture streaming to render from Qt 3D Studio to Qt Quick or vice versa.
  • Allows embedding of 2D to 3D and 3D to 2D.
  • But has limitations and not highly efficient as we run two independent rendering pipelines with synch points etc.
• These two silos should be integrated in the future.
  • To get there the underlying things should be fixed.

Qt Graphics 2020

• One possible destination.
• We start with Designer Tool (one tool).
• Underneath this tooling we have an architecture that:
  • Qt Quick Scenegraph
    • Still has the Qt Quick and Qt Quick Scenegraph with Software renderer path
    • Can have still Qt Quick and Qt Quick Scenegraph with OpenGL backend
    • Remove all others (OpenVG as it's limited, D3D12 that is not quite complete even today).
  • Qt 3D Studio Scenegraph
    • Manages Qt 3D scene and frame graphs
    • 2D scene graph merged at runtime in to the 3D scenegraph.
    • Resulting in a combined scene graph with 2D branches and no texture composition (unless needed for optimisation reasons).
  • Shared Parts between QQ and Q3DS
    • Visual shader graph node editing for:
      • QQ shader effects
      • Q3DS materials
      • Postprocessing FX
    • This gets us to describing the logical presentation of a material or effect. Allows then having different backends for Vulcan, Metal, DX12, OpenGL ES etc.)