Add missing WebGL1Renderer to Typescript definitions

[subblue]

This adds the missing WebGL1Renderer export to the Typescript definitions.
Useful to have for those who aren't yet ready to migrate the now default WebGL2 renderer :)

[Mugen87]

Thanks for adding this!

[mrdoob]

Thanks!

[mrdoob]

@subblue Out of curiosity, what's the reason you're not able to use WebGL 2?

[subblue]

@subblue Out of curiosity, what's the reason you're not able to use WebGL 2?

We will do eventually, but we're not quite ready to migrate our custom shaders yet as it's a pretty large codebase.
Limited iOS support for WebGL2 is also potentially a blocker (or maybe it is better than when I last checked), which is a shame as I would much rather use WebGL2 across the board.

[Mugen87]

Limited iOS support for WebGL2 is also potentially a blocker (or maybe it is better than when I last checked),

WebGLRenderer actually falls back to WebGL 1 if WebGL 2 is not available.

But indeed, your custom shader code has to be GLSL 3.0 conform. Otherwise shaders don't compile when using WebGL 2.

[subblue]

Oh interesting - is there a method then to switch between the shaders compatible with WebGL1 and WebGL2?

[Mugen87]

No, there is no switch for this. That means:

• WebGLRenderer always tries to create a WebGL 2 rendering context.
• WebGL 2 shader code (except of RawShaderMaterial) always runs as GLSL 3.0 code. The renderer internally converts GLSL 1 to 3. However, this conversion has limitations. E.g. it does not work when you use GLSL 3.0 keywords (like texture) as variable names.