namespace UnityEngine.AzureSky
{
	[ImageEffectAllowedInSceneView]
	[ExecuteInEditMode]
	[RequireComponent(typeof(Camera))]
	[AddComponentMenu("Azure[Sky]/Azure Fog Scattering")]
	public class AzureFogScattering : MonoBehaviour
	{
		public Material fogScatteringMaterial;

		private Camera m_camera;

		private Transform m_cameraTransform;

		private Vector3[] m_frustumCorners = new Vector3[4];

		private Rect m_rect = new Rect(0f, 0f, 1f, 1f);

		private Matrix4x4 m_frustumCornersArray;

		private static readonly int AzureFrustumCorners = Shader.PropertyToID("_Azure_FrustumCorners");

		private void Start()
		{
			m_camera = GetComponent<Camera>();
			m_cameraTransform = m_camera.transform;
		}

		[ImageEffectOpaque]
		private void OnRenderImage(RenderTexture source, RenderTexture destination)
		{
			m_camera.depthTextureMode |= DepthTextureMode.Depth;
			if (fogScatteringMaterial == null)
			{
				Graphics.Blit(source, destination);
				return;
			}
			m_camera.CalculateFrustumCorners(m_rect, m_camera.farClipPlane, m_camera.stereoActiveEye, m_frustumCorners);
			m_frustumCornersArray = Matrix4x4.identity;
			m_frustumCornersArray.SetRow(0, m_cameraTransform.TransformVector(m_frustumCorners[0]));
			m_frustumCornersArray.SetRow(2, m_cameraTransform.TransformVector(m_frustumCorners[1]));
			m_frustumCornersArray.SetRow(3, m_cameraTransform.TransformVector(m_frustumCorners[2]));
			m_frustumCornersArray.SetRow(1, m_cameraTransform.TransformVector(m_frustumCorners[3]));
			fogScatteringMaterial.SetMatrix(AzureFrustumCorners, m_frustumCornersArray);
			Graphics.Blit(source, destination, fogScatteringMaterial, 0);
		}
	}
}