#version 100
precision mediump int;
precision highp float;

attribute vec4 position;
attribute vec3 normal;

uniform mat4 wMat;
uniform mat4 witMat;
uniform mat4 wvpMat;
uniform vec4 fogParams;
uniform vec4 spotlightDir0;
uniform vec4 spotlightDir1;
uniform vec4 spotlightDir2;
varying float fog;
varying vec3 oNorm;
varying vec3 oSpDir0;
varying vec3 oSpDir1;
varying vec3 oSpDir2;
varying vec4 oWp;

void main()
{
	oWp = wMat * position;
	vec4 vPos = wvpMat * position;
	gl_Position = vPos;
	fog = 1.0;
	 if (fogParams.x == 0.0)
	{
	if (fogParams.w > 0.0)
		fog = smoothstep(fogParams.y, fogParams.z, fogParams.z - vPos.z);
	}
	else
		fog = exp2(-fogParams.x * vPos.z);
	oNorm = normalize(mat3(witMat) * normal);
	oSpDir0 = (wMat * spotlightDir0).xyz;
	oSpDir1 = (wMat * spotlightDir1).xyz;
	oSpDir2 = (wMat * spotlightDir2).xyz;
}