Pretty to convert vsh and fsh file to swift.

[XWJACK]

How about this? Keeping the original style.

public let ThreeInputVertexShader = """
attribute vec4 position;
attribute vec4 inputTextureCoordinate;
attribute vec4 inputTextureCoordinate2;
attribute vec4 inputTextureCoordinate3;

varying vec2 textureCoordinate;
varying vec2 textureCoordinate2;
varying vec2 textureCoordinate3;

void main()
{
        gl_Position = position;
        textureCoordinate = inputTextureCoordinate.xy;
        textureCoordinate2 = inputTextureCoordinate2.xy;
        textureCoordinate3 = inputTextureCoordinate3.xy;
}
"""