Then in your text editor, enter the GLSL code below, or replace with your own.įor reference a complete list of available functions and more information on the GLSL specification can be found on the website here: To begin first create a " Threshold.fs" file and place it in the assets folder. In this example we'll be making a basic 'threshold' style composition mode in which pixels in the top layer whose brightness is above the 'topAlpha' input variable show through to the background. When creating a composition shader for VDMX, only three functions are needed, one for each potential render situation between the layers: top only, bottom only, top and bottom mix. Save the file with the path extension ".fs" to the assets folder as indicated in the earlier part of this tutorial. To create a new GLSL composition mode, first create a new plain text file in TextEdit, BBEdit, or any other plain text editor. Intermediate: Creating your own GLSL Composition Modes for VDMX Installed GLSL shaders listed in the Composition Mode menu. Viewing the contents of the glslCompModes assets folder in the Finder. Choosing the 'Show Assets Folder in Finder' menu option. Launch VDMX and choose the new option from the Layer Composition Mode pop-up menu. fs files ('Threshold' and 'ThresholdRGB') into the 'glslCompModes' sub-folder. Basics: Installing and using new GLSL Composition Modesįirst download the example set of GLSL shaders created for this tutorial.įrom the 'Help' menu within VDMX, you can quickly access the special directory where the GLSL shaders are installed. ![]() ![]() Two layer VDMX project using GLSL shader based 'Threshold' composition mode. In this two part tutorial we'll look first at the basics of adding new 3rd party shaders to the VDMX assets folder on your Mac, and then move on to the intermediate level step of creating new custom blend modes. One of the other benefits of using GLSL shaders for composition is that it is very easy to write your own and add them to VDMX as a way to further customize your output to your own visual style. While the standard 'OpenGL- Add' and 'OpenGL- Over' modes are the most efficient options when it comes to rendering, when more complex composition modes such as 'Difference' or 'Multiply' are needed shaders are the best alternative when playing back movie files, particularly when you're not using CoreImage or Quartz Composer based FX on the layer. To get the best performance out of using the Hap video codec within VDMX we also recently added another new feature making it possible to use GLSL shaders to perform composition between layers. Download the completed tutorial project including sample GLSL shaders and VDMX setup.
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