Mirroring Frag Shader

GPUMirror.frag

varying highp vec2 textureCoordinate;
 uniform sampler2D inputImageTexture;
 uniform highp float division;
 uniform int mode;
 
 void main()
{
	if(mode == 0) {
		// Bypass
			gl_FragColor = texture2D(inputImageTexture, textureCoordinate);
	} else if(mode == 1) {
		// Horizontal Mirror, Favor Left
		if(textureCoordinate.x > division) {
			highp vec2 samplePos = vec2((division * 2.0) - textureCoordinate.x, textureCoordinate.y);
			gl_FragColor = texture2D(inputImageTexture, samplePos);
		} else {
			gl_FragColor = texture2D(inputImageTexture, textureCoordinate);
		}
	} else if(mode == 2) {
		// Horizontal Mirror, Favor Right
		if(textureCoordinate.x < division) {
			highp vec2 samplePos = vec2((division * 2.0) - textureCoordinate.x, textureCoordinate.y);
			gl_FragColor = texture2D(inputImageTexture, samplePos);
		} else {
			gl_FragColor = texture2D(inputImageTexture, textureCoordinate);
		}
	} else if(mode == 3) {
		// Vertical Mirror, Favor Top
		if(textureCoordinate.y > division) {
			highp vec2 samplePos = vec2(textureCoordinate.x, (division * 2.0) - textureCoordinate.y);
			gl_FragColor = texture2D(inputImageTexture, samplePos);
		} else {
			gl_FragColor = texture2D(inputImageTexture, textureCoordinate);
		}
	} else if(mode ==4) {
		// Vertical Mirror, Favor Bottom
		if(textureCoordinate.y < division) {
			highp vec2 samplePos = vec2(textureCoordinate.x, (division * 2.0) - textureCoordinate.y);
			gl_FragColor = texture2D(inputImageTexture, samplePos);
		} else {
			gl_FragColor = texture2D(inputImageTexture, textureCoordinate);
		}
	}
		
}