OpenCL

This site contains OpenCL notes, tutorials, benchmarks, news.

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Tutorial: Simple start with OpenCL and C++

To begin programming in OpenCL is always hard. Let's try with the basic example. We want to sum two arrays together. At first you need...
Atomic operations and floating point numbers in OpenCL

Many times I had questions myself why atomic operations are not supported on floating point numbers. There are two reasons for that: float...
Performance of atomics

Atomics in OpenCL are very useful, but if they are not used carefully, severe performance penalties can appear. Let's create simple Open...
Blender 2.67b and OpenCL is working better

I just updated to new Blender 2.67b and found out that something in OpenCL changed to better. Last time I checked previous version of Blende...
Dynamic parallelism in OpenCL 2.0

Provisional specifications of OpenCL 2.0 were released few months ago. One of the very interesting features is support for dynamic paralleli...
Calling kernels with many parameters

Suppose we have an OpenCL kernel with 10 parameters. In order to call the kernel we need to call clSetKernelArg 10 times: clSetKernelArg(ke...
OpenCL and Blender (Cycles)

It seems that OpenCL is not so important for Blender community (Blender 2.66a). Cycles engine works quite nice with CUDA but when you try to...
OpenCL in Blender 2.67

Last time I wrote about Blender 2.66a and the support of OpenCL. OpenCL support is experimental but it doesn't work with AMD OpenCL impl...

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