varying vec2 tex_coord;
varying vec2 pix_coord;

#if defined(VERTEX)

void main()
{
	pix_coord = vec2(gl_MultiTexCoord0.x, 1.0-gl_MultiTexCoord0.y)*1.0001;
	tex_coord = vec2((gl_Vertex.x+1.0)*0.5, (-gl_Vertex.y+1.0)*0.5);
	vec4 pos = vec4(gl_Vertex.x * 2.0, gl_Vertex.y * 2.0, gl_Vertex.z, gl_Vertex.w);
	gl_Position = gl_Vertex;
}

#elif defined(FRAGMENT)

uniform sampler2D Texture;

void main()
{
	float x = sign(pix_coord.x)*floor(abs(pix_coord.x)+0.5);
	float column = mod(x,4.0);
	float y = sign(pix_coord.y)*floor(abs(pix_coord.y)+0.5);
	float row = mod(y,4.0);

	vec4 color = texture2D(Texture, tex_coord);

	vec4 newcolor;
	if (column == 0.0) {
		newcolor = color * vec4(0.95, 0.95, 0.95, 1.0);
	} else {
		newcolor = color;
	}

	if (row == 0.0) {
		newcolor = newcolor * vec4(0.5, 0.5, 0.5, 1.0);
	} else if (row == 1.0) {
		newcolor = newcolor * vec4(0.8, 0.8, 0.8, 1.0);
	} else if (row == 3.0) {
		newcolor = newcolor * vec4(0.8, 0.8, 0.8, 1.0);
	} else {
		newcolor = newcolor;
	}
	gl_FragColor = newcolor;
}

#endif