Metal 2 on A11 — Raster Order Groups

Tech Talks

Introduction

• Access memory from overlapping fragment functions — in submission order
• Allows fragment functions to communicate
• Allows fragment functions to build more interesting data structures

Fragment Shaders with Blending

Mid-Shader Memory Access

With Raster Order Groups

Raster Order Groups on A11

• Supports tile shading and tile memory
• Supports multiple groups
  - Eliminates cases of excessive synchronization
  - Enable reader / write lock-style behavior

Example: Deferred Shading

Example: Adding Transparency

Add a new phase into the render pass
1. Fill and shade G-buffer
2. Order independent transparency for forward surfaces