layout (location = 0) in vec3 Position;                                             
layout (location = 1) in ivec4 BoneIDs;
uniform mat4 gWVP;

uniform mat4 gBones[50];
mat4 GetBones(int boneid)
{
	// reason it is using loop since this shader is shared code with
	// opengl es 2.0 and it does not allow variable indexing, and workaround
	// is to index it inside loop.
	for(int i = 0; i < 50;i++){   
		if( i == boneid){
			return gBones[i];
		}
	}
	
}

void main()
{       
	mat4 BoneTransform = GetBones(BoneIDs[0]);
	BoneTransform     += GetBones(BoneIDs[1]);
    BoneTransform     += GetBones(BoneIDs[2]);
    BoneTransform     += GetBones(BoneIDs[3]);
		
    vec4 PosL    = BoneTransform * vec4(Position, 1.0);
    gl_Position  = gWVP * PosL;
}
//---