protected override void OnUpdate()
{
// add matrices component if needed
Entities.WithNone <LightMatrices>().WithAll <Light>().ForEach((Entity e) =>
{
EntityManager.AddComponent <LightMatrices>(e);
});
// add frustum component if needed
Entities.WithNone <Frustum>().WithAll <Light>().ForEach((Entity e) =>
{
EntityManager.AddComponent <Frustum>(e);
});
// update
Entities.ForEach((ref Light c, ref LocalToWorld tx, ref LightMatrices m, ref SpotLight sl, ref Frustum f) =>
{ // spot light
m.projection = ProjectionHelper.ProjectionMatrixPerspective(c.clipZNear, c.clipZFar, sl.fov, 1.0f);
m.view = math.inverse(tx.Value);
m.mvp = math.mul(m.projection, m.view);
ProjectionHelper.FrustumFromMatrices(m.projection, m.view, ref f);
});
Entities.ForEach((ref Light c, ref LocalToWorld tx, ref LightMatrices m, ref DirectionalLight dr, ref Frustum f) =>
{ // directional
m.projection = ProjectionHelper.ProjectionMatrixOrtho(c.clipZNear, c.clipZFar, dr.size, 1.0f);
m.view = math.inverse(tx.Value);
m.mvp = math.mul(m.projection, m.view);
ProjectionHelper.FrustumFromMatrices(m.projection, m.view, ref f);
});
Entities.WithNone <DirectionalLight, SpotLight>().ForEach((ref Light c, ref LocalToWorld tx, ref LightMatrices m, ref Frustum f) =>
{ // point
m.projection = float4x4.identity;
m.view = math.inverse(tx.Value);
m.mvp = math.mul(m.projection, m.view);
// build furstum from bounds
ProjectionHelper.FrustumFromCube(tx.Value.c3.xyz, c.clipZFar, ref f);
});
}
static void FrustumFromCamera(ref CameraMatrices cm, ref Frustum dest)
{
ProjectionHelper.FrustumFromMatrices(cm.projection, cm.view, ref dest);
}