Search notes:

OpenGL ES Shading Language

It seems that the «ES» stands for Embedded Subset.
Apparently, the OpenGL ES Shading Language is a (strict?) subset of the OpenGL Shading Language.

int vs float

42 is an integer, not a float. The following assignment produces the error Cannot convert from const int to highp float. 
float num = 42;
Thus, in order to assign a number to a float, it must be made sure that a float is assigned: 
float num = 42.0;

Constants

const float PI = radians(180.0);

See also

The WebGLRenderingContext and WebGL2RenderingContext interface allow to draw onto a <canvas> HTML element.

Index

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