varying vec2 uv[5], uvB;
const vec2 fractions = vec2(0.984375, 0.0078125);
uniform vec2 texSize;
uniform vec2 fullSize;

varying vec2 blur;

void main() {
	// make biome tiler
	// to reuse the tiling planet surfaces we need to account for the bleed they have baked into the planet sphere uv's.
    // each planet tile is 2016x2016 with 16 pixel tiled bleed on each side   
	uvB = (vec2(gl_Color.x, gl_MultiTexCoord0.y) * fractions.x + fractions.y) / vec2(4.0, 2.0);
	uvB.y = 1.0 - uvB.y;
	
	// make splatmap blurs
	blur = vec2(1.0 / fullSize.x, 1.0 / fullSize.y);
	uv[0] = gl_MultiTexCoord0.xy;
	uv[1] = uv[0] + blur;
	uv[2] = uv[0] + vec2(-blur.x, blur.y);
	uv[3] = uv[0] + vec2(-blur.x, -blur.y);
	uv[4] = uv[0] + vec2(blur.x, -blur.y);
	
	gl_Position = ftransform();
	gl_FrontColor = gl_Color;
	gl_BackColor = gl_Color;
}