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Nicolas Silva edited this page Dec 3, 2019
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Webrender is an experimental renderer for Servo that aims to draw web content like a modern game engine.
- Specialized renderer for web content.
- Not a general purpose vector graphics API.
- Complex items such as canvas can be rendered on CPU.
- Make the common case fast.
- Use GPU to do all rasterization where possible.
- Items not well suited to GPU rasterizing can be drawn on the CPU and cached in textures.
- Draw only what's on screen
- Aggressively cull items.
- Redraw each frame (when there is something to be updated - not a constant fps like games!).
- Cache results (such as vertex buffers, rasterized glyphs) where possible between frames.
- Take advantage of knowledge of entire scene up front to optimize drawing.
- Batching
- Group items into small number of draw calls.
- Necessary for good performance with OpenGL.
- High resolution displays, GPUs likely to scale better than CPUs here.
- GPUs excel at blits, blending.
- Hit common driver paths used in games, encounter fewer driver bugs?
- May be faster for cases that game engines already deal with (animations, transitions, 3d transforms).
- Simplifies parts of layout and rendering in traditional painting model.
- Layout no longer needs to worry about layerization, as this is an internal implementation detail!