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Choosing a strategy

Comparison of approaches


Key Characteristics

Display sharing

  • The physical display can be shared across multiple operating systems or major functional units of a single operating system.
  • Hardware Compositor block provides multiple layers that can be assigned to different functional units. The hardware then combines (composites) them to create the final display buffer.
  • The Compositor hardware block is typically close to or part of the Display Unit hardware block.
  • The different systems do not need to know about each other.
  • No need to have protocols to pass graphics between operating systems.

Surface sharing

  • Little to no impact for the content producer (depends on implementation)
  • Integration in existing graphics systems is possible with reasonable effort
  • The content of individual graphical applications can be shared

API Remoting

  • Bandwidth efficient (for certain cases)
  • Offloads rendering effort to receiver
  • Flexible, while the controller has detailed control over results
  • Potential API complexity – needing synchronized software/API updates

Shared State Independent Rendering

  • Low inter-domain data channel bandwidth usage
  • Applicability to mid/low performant SoC
  • Operating System - agnostic approach

GPU sharing

  • Access to the GPU hardware from several OS's: cost saving.
  • safety concerns: force preemption needs to implemented to ensure safety use cases

Hardware may provide additional features that enhance isolation of the different functional units... characteristics of each - trade-offs, ...  "dry data"