shader_current

This function will return the index ID value of the shader currently being used for rendering, or it will return -1 if no shader is being used.

Syntax:

shader_current();

Returns:

Shader Asset or -1 (if no shader is assigned)

Example:

if (shader_current() == -1)
{
    shader_set(sh_warp)
}

The above code will check to see what the current shader is and if it returns -1 (no shader being used) then a shader is set.