vertex_shader
	"varying vec4 color;
	
	void main()
	{
		gl_Position = ftransform();
		color = gl_Color;
	}";

fragment_shader
	"uniform sampler2DShadow shadow;
	varying vec4 color;
	
	void main()
	{
		vec2 r = gl_TexCoord[0].xy*2.0-1.0;
		float alpha = max(1.0-dot(r, r), 0.0);
		gl_FragColor = vec4(color.rgb, alpha*0.1);
	}";