UnityEngine.Rendering.CommandBuffer.SetGlobalVector C# (CSharp) Method

        public void SetGlobalVector(int nameID, Vector4 value)
        {
            INTERNAL_CALL_SetGlobalVector(this, nameID, ref value);
        }

    // Whenever any camera will render us, add a command buffer to do the work on it
    public void OnWillRenderObject()
    {
        var act = gameObject.activeInHierarchy && enabled;
        if (!act)
        {
            Cleanup();
            return;
        }

        var cam = Camera.current;
        if (!cam)
            return;

        CommandBuffer buf = null;
        // Did we already add the command buffer on this camera? Nothing to do then.
        if (m_Cameras.ContainsKey(cam))
            return;

        if (!m_Material)
        {
            m_Material = new Material(m_BlurShader);
            m_Material.hideFlags = HideFlags.HideAndDontSave;
        }

        buf = new CommandBuffer();
        buf.name = "Grab screen and blur";
        m_Cameras[cam] = buf;

        // copy screen into temporary RT
        int screenCopyID = Shader.PropertyToID("_ScreenCopyTexture");
        buf.GetTemporaryRT (screenCopyID, -1, -1, 0, FilterMode.Bilinear);
        buf.Blit (BuiltinRenderTextureType.CurrentActive, screenCopyID);

        // get two smaller RTs
        int blurredID = Shader.PropertyToID("_Temp1");
        int blurredID2 = Shader.PropertyToID("_Temp2");
        buf.GetTemporaryRT (blurredID, -2, -2, 0, FilterMode.Bilinear);
        buf.GetTemporaryRT (blurredID2, -2, -2, 0, FilterMode.Bilinear);

        // downsample screen copy into smaller RT, release screen RT
        buf.Blit (screenCopyID, blurredID);
        buf.ReleaseTemporaryRT (screenCopyID);

        // horizontal blur
        buf.SetGlobalVector("offsets", new Vector4(2.0f/Screen.width,0,0,0));
        buf.Blit (blurredID, blurredID2, m_Material);
        // vertical blur
        buf.SetGlobalVector("offsets", new Vector4(0,2.0f/Screen.height,0,0));
        buf.Blit (blurredID2, blurredID, m_Material);
        // horizontal blur
        buf.SetGlobalVector("offsets", new Vector4(4.0f/Screen.width,0,0,0));
        buf.Blit (blurredID, blurredID2, m_Material);
        // vertical blur
        buf.SetGlobalVector("offsets", new Vector4(0,4.0f/Screen.height,0,0));
        buf.Blit (blurredID2, blurredID, m_Material);

        buf.SetGlobalTexture("_GrabBlurTexture", blurredID);

        cam.AddCommandBuffer (CameraEvent.AfterSkybox, buf);
    }