Graphics Programming on the Web WebCL Course Notes

Mikael Bourges-Sevenier
Motorola Mobility, Inc.
Siggraph, 2012

   title={Graphics Programming on the Web WebCL Course Notes},

   author={Bourges-S{‘e}venier, Mika{"e}l},



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This document introduces WebCL [1], a new standard under development by the Khronos Group, for highperformance computing in web browsers. Since WebCL wraps OpenCL, the course starts by reviewing important OpenCL [2] concepts. Next, we detail how to program with WebCL in the browser and on devices such as GPUs. Finally, we discuss WebCL – WebGL [3] interoperability and provide complete examples of moving from WebGL shaders to WebCL. Last, we provide tips and tricks to ease such translation and to optimize WebCL code performance.
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Free GPU computing nodes at

Registered users can now run their OpenCL application at We provide 1 minute of computer time per each run on two nodes with two AMD and one nVidia graphics processing units, correspondingly. There are no restrictions on the number of starts.

The platforms are

Node 1
  • GPU device 0: AMD/ATI Radeon HD 5870 2GB, 850MHz
  • GPU device 1: AMD/ATI Radeon HD 6970 2GB, 880MHz
  • CPU: AMD Phenom II X6 @ 2.8GHz 1055T
  • RAM: 12GB
  • OS: OpenSUSE 11.4
  • SDK: AMD APP SDK 2.8
Node 2
  • GPU device 0: AMD/ATI Radeon HD 7970 3GB, 1000MHz
  • GPU device 1: nVidia GeForce GTX 560 Ti 2GB, 822MHz
  • CPU: Intel Core i7-2600 @ 3.4GHz
  • RAM: 16GB
  • OS: OpenSUSE 12.2
  • SDK: nVidia CUDA Toolkit 5.0.35, AMD APP SDK 2.8

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