![]() ![]() RunJS – the perfect playground for creative little JS projects For example, you can install NPM packages from other JavaScript projects, import node modules, as well as change the working directory. Surprisingly, you can also extend the app’s base functionality. Furthermore, you can choose whether line numbering or line wrapping is used, and also how the so-called invisible characters should be handled. For example, from the Settings section, you can change anything from the GUI theme, all the way up to the font and its size. Definitely has more than it leads you to thinkĭespite its overall simplicity, the editor does have a decent array of customization features available. Of course, the editor does have some of the basic features one might expect such as syntax highlighting and indentation, and a real-time code preview function (which can also be turned off in order to allow you to execute the code manually). Hence, the app has a non-pretentious GUI with only two panels (one for writing the code, and one for previewing the output) and not much else in terms of eye candy. Simple JS editor that can be used by beginners and experts alikeĪs mentioned before, the whole idea behind this app is to be as simple as possible. The solution to this problem might come in the form of RunJS, a super-minimalist JavaScript scratchpad that provides an accessible and non-intimidating way of writing and testing JavaScript code directly from your computer’s desktop. Be that as it may, code editors usually tend to be obnoxiously feature-packed, not the best solution for beginners as well as for developers that just want to try out new simple things in JavaScript. You can edit these programs and see the results the next time the WebGL context redraws (for example, in the next animation frame).When it comes to writing and testing JavaScript code there’s really no shortage of very good options out there. The middle and right hand panes show the vertex and fragment shaders for the currently selected program. ![]() If you click the entry, its vertex and fragment shaders are shown in the other two panes, and you can edit them. ![]() This is useful for focusing on certain shaders or hiding overlapping geometry: If you click the eyeball icon just left of the program’s entry, that program is disabled. If you hover over an entry in the list, the geometry drawn by that program is highlighted in red: The left hand pane lists all programs currently in use by a WebGL context. You’ll now see a window divided into three panes: a list of all the GLSL programs on the left, the vertex shader for the currently selected program in the middle, and the fragment shader for the currently selected program on the right: Managing programs ¶ The screenshots below are from the Unreal Engine demo. To get started, load a page which creates a WebGL context and loads a program into it. Click it and the Shader Editor opens.Īt first you’ll just see a blank window with a button asking you to reload the page: You’ll now see “Shader Editor” appear in the toolbar. To enable it, open the Toolbox settings and check “Shader Editor” in the “Default Firefox Developer Tools” item. The Shader Editor is disabled by default. With the Shader Editor, you can examine and edit the source of the vertex and fragment shaders. JavaScript code running in the page then sends them for compilation using the WebGL APIs, and they’re executed on the device’s GPU when needed. In WebGL they can be included in a page in several ways: as text hardcoded in JavaScript strings, as separate files included using tags, or retrieved from the server as plain text. These shaders are written in OpenGL Shading Language, or GLSL. With WebGL you provide 2 programs called shaders which are called at the appropriate stages of the OpenGL rendering pipeline: a vertex shader, which computes the clip space coordinates of each vertex to be drawn, and a fragment shader, which determines the color for each pixel to be drawn. WebGL is a JavaScript API for rendering interactive 3D graphics and 2D graphics in the browser without using plugins. The Shader Editor enables you to see and edit the vertex and fragment shaders used by WebGL. This tool has been deprecated and will soon be removed from Firefox.
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