#version 120
const int nLightCount = 2;
attribute vec4 in_vertex;
attribute vec3 in_normal;
attribute vec2 in_uv;
attribute vec4 in_color;
attribute vec4 in_uv2;
 
uniform float time;
uniform vec4 wsRot;
uniform vec4 wsPos;
uniform vec2 texSize;

varying vec4 uvNoise, pos;
varying vec3 normal, npos, vertCol;
varying vec2 uv, uv2, uv3, uvB[5];
varying float pulse;
varying vec3 light[nLightCount];
varying vec3 lightColor[nLightCount];
varying float dist[nLightCount];

const vec2 fractions = vec2(0.984375, 0.0078125);
/*
vec2 rotator(vec2 rotate, float rate)
{
    return vec2(dot(rotate,  vec2(cos(rate),  -sin(rate))), dot(rotate,  vec2(sin(rate),  cos(rate))));
}/*
// regular atan() fails at 0,0
float atan2(float y, float x)
{
    return x == 0.0 ? sign(y)*pi/2 : atan(y, x);
}*/
vec3 toLinear(vec3 x) {
	return pow(x, vec3(2.2));
}
	 
vec3 wsAllign(vec3 x){
    return x + 2.0 * cross(wsRot.xyz, cross(wsRot.xyz, x) + wsRot.w * x);
}
 
vec2 invertBlurEdge(vec2 uvB){
    return abs(fract((uvB + 1.0) * 0.5) - 0.5) * 2.0;
}
 
void main()
{
 
    pulse = abs(time  * 2.0 - 1.0);
    pos = gl_ModelViewMatrix * in_vertex;
   
    // convert view, normal and light vectors to world space and quaternion correct for model rotation
    mat3 tcamrot = transpose(mat3x3(gl_ModelViewMatrix));
    npos = (wsAllign(normalize(tcamrot * -pos.xyz)));
   
    // special view vector to correct just for cubemap reflections
    normal = (tcamrot * (gl_NormalMatrix * wsAllign(normalize(in_normal))));
    for (int i = 0; i < nLightCount; i++) {
        light[i] = wsAllign(normalize((tcamrot * (((gl_LightSource[i].position)).xyz - pos.xyz))));
    }
   
    uv = in_uv;
    uv2 = in_uv2.xy;
    uv3 = in_uv2.zw;
    uv3.x = 1.0 - uv3.x;
	
	// make splatmap blurs
	vec2 blur = vec2(1.0 / texSize.x, 1.0 / texSize.y);
	uvB[0] = uv3;
	uvB[1] = uv3 + blur;
	uvB[2] = uv3 + vec2(-blur.x, blur.y);
	uvB[3] = uv3 + vec2(-blur.x, -blur.y);
	uvB[4] = uv3 + vec2(blur.x, -blur.y);
	
	// clamp so we don't get south poles blending into north poles an vice versa
	blur.y = 1.0 - blur.x;
	uvB[0].y = clamp(uvB[0].y, blur.x, blur.y);
	uvB[1].y = clamp(uvB[1].y, blur.x, blur.y);
	uvB[2].y = clamp(uvB[2].y, blur.x, blur.y);
	uvB[3].y = clamp(uvB[3].y, blur.x, blur.y);
	uvB[4].y = clamp(uvB[4].y, blur.x, blur.y);

	uvNoise = ((vec4(uv, uv2) * 3.0) * fractions.x + fractions.y) / 3.0;
	
    vertCol = in_color.rgb;
	// use to kill off the worst polar splatmap distortions
	vertCol.b *= 0.6;
    gl_Position = gl_ProjectionMatrix * pos;
}