struct VS_OUTPUT
{
	float4 pos: SV_POSITION;
	float4 col: COLOR0;
};

VS_OUTPUT vertstripe_vs( float4 Pos : POSITION )
{
	VS_OUTPUT outp;

	outp.pos = Pos;

	// split into left/right eye
	// note: the 0.055f is to undo the off-center change for canting
	float eye_independent_x;
	if(Pos.x < 0) {
		eye_independent_x = Pos.x -0.055f + 0.5f;
	}
	else 
	{
		eye_independent_x = Pos.x +0.055f - 0.5f;
	}

	// check which quadrant we're in, then choose the color

	if(eye_independent_x < 0) {
		if(Pos.y >= 0) {
			// upper left, orange
			outp.col = float4(1.0f, 0.482f, 0.0f, 1.0f);
		}
		else {
			// lower left, blue
			outp.col = float4(0.357f, 0.988f, 1.0f, 1.0f);
		}
	}
	else
	{
		if(Pos.y >= 0) {
			// upper right, purple
			outp.col = float4(1.0f, 0.0f, 1.0f, 1.0f);
		} 
		else {
			// lower right, yellow
			outp.col = float4(1.0f, 0.976f, 0.337f, 1.0f);
		}
	}

	return outp;
}