GLW [ERROR]: Unable to compile shader bundle://src/ui/glw/glsl/v1.glsl
GLW [ERROR]: ERROR: 0:21: 'clamp' : no matching overloaded function found

GLW [ERROR]: Unable to link shader Texture
GLW [ERROR]: ERROR: fragment shader reads varying 'f_col_mul' which is not written.
             ERROR: fragment shader reads varying 'f_tex' which is not written.
             ERROR: fragment shader reads varying 'f_col_off' which is not written.

GLW [ERROR]: Unable to link shader Flat
GLW [ERROR]: ERROR: fragment shader reads varying 'f_col_mul' which is not written.
             ERROR: fragment shader reads varying 'f_col_off' which is not written.