The new capability of loading user-provided GLSL shaders into Processing’s P2D and P3D renderers opens up the possibility of customizing all the rendering operations in Processing, as well as of creating interactive graphics that would be very hard or impossible to generate otherwise. For OpenGL web applications, WebGL supports (only) programmable pipelines through GLSL shaders, and this has motivated the creation of online repositories of shader effects that can be run directly from inside the web browsers, as long as they support WebGL. Sites like the GLSL sandbox or Shader Toy hold large collections of shader effects that can be edited and controlled interactively through the browser. This new post will explain how to integrate GLSL shaders from the GLSL sandbox and Shader Toy websites into a Processing sketch.
Update: With the release of Processing 2.0 final, some of the contents in this post are outdated, please check this tutorial for a detailed description of the finalized shader API.
Archive for the ‘Programming’ Category
Shaders in Processing 2.0 – Part 2 9 comments
Shaders in Processing 2.0 – Part 1 4 comments
The new OpenGL renderers in Processing 2.0 (P2D/P3D) rely extensively on GLSL shaders. Although in most common situations the use of shaders is invisible to the user, Processing includes a new PShader class that allows to apply custom shaders to the drawing of the sketch. This post describes the shader architecture in Processing 2.0, and the common interfaces that custom GLSL shader code needs to include in order to be accepted by the OpenGL renderers in Processing.
Update: With the release of Processing 2.0 final, some of the contents in this post are outdated, please check this tutorial for a detailed description of the finalized shader API.
OpenGL in Processing 2.0 alpha 5 14 comments
The march towards the 2.0 version of Processing reached an important milestone with the alpha 5 release, available for download since last Friday. The detailed list of changes is here, while the wiki offers a more in-depth discussion of the new features and ongoing changes. A major update in alpha 5 is the inclusion of the new OpenGL renderer for the desktop and Android modes, called P3D, which has been rewritten from the ground up in order to offer improved performance. I will describe some important elements of P3D in this post.
Update: With the release of Processing 2.0 final, some of the contents in this post are outdated, please check the new reference, and tutorials – specially those about P3D, PShape and shaders – for a detailed description of the finalized API.
A couple of GSVideo tips 18 comments
GSVideo is a Processing library I have been working on for almost four years now (!). It improves video support in Processing by using GStreamer as the underlying multimedia toolkit. The latest release is 1.0.0 and it should be used exclusively with Processing 1.x (the alpha releases of Processing 2.0 already include a simplified version of GSVideo as the built-in video library). Two problems users typically face with GSVideo and about which I receive emails from time to time, are (1) using GSVideo in Eclipse, and (2) exporting GSVideo applications from the Processing environment. So I put together in this post a couple of tips that might be useful in these situations.
Syphon Client working in Processing 16 comments
Syphon is an OSX framework to share frames between applications. The authors of Syphon, Tom Butterworth and Anton Marini, made it very easy to create Syphon plugins for other languages, frameworks, VJ’ing and mapping tools, etc. So a while ago I wrote a simple Processing library that allowed to send frames out. This was quite useful, but still missing half of the Syphon functionality. With some additional coding, we were able to add the client part, and I just put the new version (0.4) of the Syphon-Processing library up for download (it requires Processing 2.0a4 or newer).
codeanticode 