bgfx/3rdparty/glsl-optimizer/tests/fragment/opt-copypropelems-swizzle-in.txt

varying vec2 uv;
uniform sampler2D tex;
void main() {
	vec4 v = texture2D (tex, uv);
	v.xy = v.yx;
	v.x = -v.x;
	gl_FragColor = v;
}