attribute vec3 vPosition;
attribute vec2 vTexCoord;
attribute vec3 vNormal;
#ifdef INSTANCED
attribute vec4 iModel0;
attribute vec4 iModel1;
attribute vec4 iModel2;
attribute vec4 iModel3;
#endif

varying vec2 texCoord;
varying vec4 fragPosLightSpace;
varying vec3 fragNormal;
varying float fogDistance;

uniform mat4 ProjectionModelViewMatrix;
uniform mat4 ModelViewMatrix;
uniform mat4 uLightFromCamera;
uniform vec3 uPlayerEyePos;

void main()
{
	vec4 worldPos = vec4(vPosition, 1.0);
	vec3 normal = vNormal;
#ifdef INSTANCED
	mat4 instanceModel = mat4(iModel0, iModel1, iModel2, iModel3);
	worldPos = instanceModel * worldPos;
	normal = normalize(mat3(instanceModel) * normal);
#endif
	vec4 eyePos = ModelViewMatrix * worldPos;
	fogDistance = length(eyePos.xyz - uPlayerEyePos);
	gl_Position = ProjectionModelViewMatrix * worldPos;
	texCoord = vTexCoord;
	fragPosLightSpace = uLightFromCamera * eyePos;
	fragNormal = mat3(ModelViewMatrix) * normal;
}