WebGL vs WebGPU: Benchmark Differences for Shader Tests
Compare WebGL vs WebGPU benchmarks for shader workloads. Covers browser support, timing, portability, API differences, and Volume Shader BM result scope.
What you'll learn
- How WebGL and WebGPU differ as browser graphics APIs.
- Why WebGL remains useful for broad one-click compatibility tests.
- What WebGPU can expose that WebGL benchmarks cannot.
- Why WebGL and WebGPU result pools should stay separate.
- How Volume Shader BM should label future API-specific benchmark paths.
Quick definition
WebGL and WebGPU benchmarks measure different browser GPU API paths. WebGL emphasizes broad compatibility and GLSL fragment-shader rendering, while WebGPU exposes newer pipeline and compute concepts. Their scores should be labeled separately unless a benchmark defines a calibrated cross-API workload.
What is the difference between WebGL and WebGPU benchmarks?
WebGL is the broad compatibility path for browser graphics today. It maps closely to OpenGL ES concepts and runs on a wide range of desktop and mobile browsers.
WebGPU is the newer browser GPU API. It is designed around modern GPU concepts, WGSL shaders, explicit pipeline setup, and compute workloads, but browser support is still less universal than WebGL.
How do WebGL and WebGPU change benchmark design?
A WebGL benchmark is useful when reach matters: phones, older laptops, Safari paths, school machines, and locked-down browsers. A WebGPU benchmark can expose newer GPU capabilities and compute-style workloads where it is supported.
Scores should not be merged unless the workload and API are intentionally equivalent. WebGL fragment shaders and WebGPU render or compute pipelines can stress different driver paths.
Why does Volume Shader BM use WebGL today?
Volume Shader BM prioritizes compatibility and one-click access. WebGL keeps the benchmark available to more devices without requiring experimental flags or a narrower browser set.
A future WebGPU path should be labelled separately, with its own methodology and result fields, because it would not be the same benchmark as the WebGL path.
Repeatable workflow
01Identify the API path
02Keep result pools separate
03Compare support first
Comparison notes
| Question | Volume Shader BM | Other approach |
|---|---|---|
| Compatibility | WebGL/WebGL2 reaches more existing browsers and devices. | WebGPU is newer and not available in every widely used browser. |
| Shader language | GLSL ES fragment shaders. | WebGPU uses WGSL shader modules. |
| Benchmark scope | Focused fragment-shader and pixel workload. | Can include render pipelines, compute pipelines, buffers, and newer GPU features. |
Key takeaways
- 01 WebGL is the safer compatibility default for broad browser volume shader tests.
- 02 WebGPU can be valuable for modern pipeline and compute-style workloads.
- 03 A WebGPU score is not automatically a faster version of the same WebGL score.
- 04 API path, shader language, browser support, and workload design must be reported together.