Are there ways to debug GLSL code or display variable values directly from within the GLSL code when using it with WebGL? Does three.js or scene.js offer any features for this purpose?
Are there ways to debug GLSL code or display variable values directly from within the GLSL code when using it with WebGL? Does three.js or scene.js offer any features for this purpose?
Not exactly,
My preferred method for debugging GLSL involves outputting colors. For instance, when dealing with 2 shaders like the ones below:
// vertex shader
uniform mat4 worldViewProjection;
...
etc.
If I encounter issues on the screen, my initial step is to modify the fragment shader by simply appending a line at the end:
gl_FragColor = vec4(1,0,0,1); // display red
Upon seeing my geometry, it indicates that the problem likely lies within the fragment shader. To verify my normals, I may execute this:
gl_FragColor = vec4(v_normal * 0.5 + 0.5, 1);
If the normals appear normal, I might examine the UV coordinates using:
gl_FragColor = vec4(v_texCoord, 0, 1);
and so forth...
If you're looking to explore WebGL performance, consider checking out WebGL-Inspector.
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