Support other math functions

[rjamesnw]

I noticed you don't have support for other math functions, such as trunc(). I tried to put the function call in anyhow, and it seems like the shader script outputs it as is, but it won't compile for some reason (thinks it's a missing identifier instead of a call).

float user_gx=(trunc((user_x/user_pixelSize))+user_xArraySelector);
float user_gridXDiff=(user_gx-user_gridX);
float user_gridDirX=sign(user_gridXDiff);
if ((user_outIndex==10.0)) {
kernelResult = user_gridDirX;return;
}

float user_gy=(trunc((user_y/user_pixelSize))+user_yArraySelector);
float user_gridYDiff=(user_gy-user_gridY);
float user_gridDirY=sign(user_gridYDiff);
if ((user_outIndex==11.0)) {
kernelResult = user_gridDirY;return;
}

Shader compilation errors
(283, 16): Undeclared identifier 'trunc'

I've used that function in other shaders in webgl and it works just fine.

[Renha]

Yeah,

Javascript Math functions (Math.floor() and etc.)

on the main page should be more like:

Couple javascript Math functions (Math.floor() and few more)

Math.hypot() isn't there too.

[robertleeplummerjr]

Would you be able to compile a list of these that are needed? We could create features for each, and probably add them in v2.

[WolfSoko]

Feels a little hacky, but you can use all given webgl shader functions, if you just write this.trunc(1.23) in your kernel function.