Renderer roadmap

[lilleyse]

• Cleanup
  • Refactor command execution. For example use computeEngine.execute(command) directly.
  • Pass just frameState to update functions. Place context and commandList inside frameState, Pass only frameState to primitive.update #1753.
  • Separate command lists to avoid sorting based on pass type later.
• Instancing
  • Instanced draw calls built into Renderer
  • Update BillboardCollection if possible
  • Instanced 3D models
  • 3D Tiles integration
• WebGL 2, WebGL 2 and WebGL Extensions Roadmap #797
• Post-processing, Post processing #5615
• Shadows, Shadows Roadmap #2594 (branch)
• Particle system Particle Systems #5212
• Shader pipeline, Shader Pipeline Roadmap #1031
• WebGL in Workers, https://hacks.mozilla.org/2016/01/webgl-off-the-main-thread/
• Fog
  • Add to 3D Tiles
  • Is horizon culling still needed?
  • Distance cull other primitives beyond terrain/imagery, e.g., 3D Tiles. Even avoid CZML processing, etc. for objects out of view.
  • Use fewer frustums
  • Add to Columbus view (requires an atmosphere)
  • Affect models (perhaps screen-space), Make Models be affected by Fog #4196
  • Blend better with atmosphere, Make fog color correspond to atmosphere color #4195
• Water improvements
• Material improvements
• Multiple viewports, Multiple Viewports #5214

For background, see the original roadmap for the Data Driven Renderer.

[pjcozzi]

Refactor command execution. For example use computeEngine.execute(command) directly.

Looks OK for us to have context.executeDrawCommand, context.executeClearCommand, and ComputeEngine.execute.

[pjcozzi]

1. Separate command lists to avoid sorting based on pass type later.
2. Pass just frameState to update functions. Place context and commandList inside frameState.

I think we need to do (2) before doing (1), right? Perhaps just hold on these for now.

[bagnell]

Derived command shaders are cached in the ShaderCache so they will be properly released when the original shader is. The same method of caching can be used for the derived render states.