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void alphaTest(inout vec4 color) {
if( MGL_GREATER == mgl_AlphaTestFunc ) {
if ( color.a <= mgl_AlphaTestRef ) {
DISCARD(color);
}
} else if( MGL_LESS == mgl_AlphaTestFunc ) {
if ( color.a >= mgl_AlphaTestRef ) {
DISCARD(color);
}
} else if( MGL_LEQUAL == mgl_AlphaTestFunc ) {
if ( color.a > mgl_AlphaTestRef ) {
DISCARD(color);
}
} else if( MGL_GEQUAL == mgl_AlphaTestFunc ) {
if ( color.a < mgl_AlphaTestRef ) {
DISCARD(color);
}
} else if( MGL_EQUAL == mgl_AlphaTestFunc ) {
if ( abs( color.a - mgl_AlphaTestRef ) > EPSILON ) {
DISCARD(color);
}
} else if( MGL_NOTEQUAL == mgl_AlphaTestFunc ) {
if ( abs( color.a - mgl_AlphaTestRef ) <= EPSILON ) {
DISCARD(color);
}
} else if( MGL_NEVER == mgl_AlphaTestFunc ) {
DISCARD(color);
} /* else if( MGL_ALWAYS == mgl_AlphaTestFunc ) {
// NOP
} */
}
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