// This is C2E2f_passthru from "The Cg Tutorial" (Addison-Wesley, ISBN
// 0321194969) by Randima Fernando and Mark J. Kilgard.  See page 53.

struct fregm_Output {
  float4 color : COLOR;
};

fregm_Output fregm_shader(float2 texCoord : TEXCOORD0,
							float4 color : COLOR)
{
	fregm_Output OUT;
	char tf;
	float x, y;

	x = texCoord.x;
	y = texCoord.y;

	OUT.color = color;

	tf = (
		x*x/49 + y*y/9 - 1 < 0 &&
		((abs(x) >= 4 && (-3*sqrt(33.0f)/7 <= y && y <= 0)) ||
		 (abs(x) >= 3 && y>=0)) ||
		((-3<=y && y <= 0) &&
		 (-4<=x && x < 4) &&
		 (abs(x/2.0) + sqrt(1.0-(abs(abs(x)-2)-1)*(abs(abs(x)-2)-1))-(3*sqrt(33.0f)-7)*x*x/112.0-y-3.0) <= 0) ||
		(y>=0 &&
		 (3.0/4.0<=abs(x) && abs(x)<=1) &&
		 -8*abs(x)-y+9>=0) ||
		((1.0/2.0<=abs(x) && abs(x)<=3.0/4.0) &&
		 3.0*abs(x)-y+3.0/4.0>=0 &&
		 y>=0) ||
		(abs(x) <= 1.0/2.0 &&
		 y>0 &&
		 9.0/4.0-y>=0) ||
		(abs(x)>=1 &&
		 y>=0 &&
		 (-abs(x)/2.0f-3.0/7.0*sqrt(10.0)*sqrt(4.0-(abs(x)-1.0)*(abs(x)-1.0))-y+6.0*sqrt(10.0)/7.0+3.0/2.0) >=0)
		);

	OUT.color[2] = 0;
	if(!tf) {
		OUT.color[0] = 0;
		OUT.color[1] = 0;
	}
	return OUT;
}