Add WebGL 2.0 support (Equivalent to OpenGL ES 3) to WGLWidget
Current implementation of WGLWidget supports WebGL 1.0 (Equivanlent of OpenGL ES 2.0). It lacks support for Vertex Array Objects and various equivalent functions such as
void glBindVertexArray(GLuint array);
void glGenVertexArrays(GLsizei n,
WebGL 2.0 specs were released in May 2019. It is equivalent of OpenGL ES 3.0. More info here: https://www.khronos.org/webgl/ and https://www.khronos.org/registry/webgl/specs/latest/2.0/.
I request you to include support for WebGL 2.0 in the next release of Wt.
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