Fixed issue with camera physical mode not enableable with postprocess…

PostProcessing/Runtime/PostProcessLayer.cs

@@ -276,7 +276,11 @@ void OnPreCull()
             // We also need to force reset the non-jittered projection matrix here as it's not done
             // when ResetProjectionMatrix() is called and will break transparent rendering if TAA
             // is switched off and the FOV or any other camera property changes.
-            m_Camera.ResetProjectionMatrix();
+
+#if UNITY_2018_2_OR_NEWER
+            if (!m_Camera.usePhysicalProperties)
+#endif
+                m_Camera.ResetProjectionMatrix();
             m_Camera.nonJitteredProjectionMatrix = m_Camera.projectionMatrix;
 
 #if !UNITY_SWITCH
@@ -446,7 +450,13 @@ void OnPostRender()
 
             if (m_CurrentContext.IsTemporalAntialiasingActive())
             {
-                m_Camera.ResetProjectionMatrix();
+#if UNITY_2018_2_OR_NEWER
+                // TAA calls SetProjectionMatrix so if the camera projection mode was physical, it gets set to explicit. So we set it back to physical.
+                if (m_CurrentContext.physicalCamera)   
+                    m_Camera.usePhysicalProperties = true;
+                else 
+#endif
+                    m_Camera.ResetProjectionMatrix();
 
                 if (m_CurrentContext.stereoActive)
                 {
@@ -569,6 +579,11 @@ void SetupContext(PostProcessRenderContext context)
             context.antialiasing = antialiasingMode;
             context.temporalAntialiasing = temporalAntialiasing;
             context.logHistogram = m_LogHistogram;
+
+#if UNITY_2018_2_OR_NEWER
+            context.physicalCamera = context.camera.usePhysicalProperties;
+#endif
+
             SetLegacyCameraFlags(context);
 
             // Prepare debug overlay

PostProcessing/Runtime/PostProcessRenderContext.cs

@@ -134,7 +134,9 @@ public Camera camera
         internal Texture logLut;
         internal AutoExposure autoExposure;
         internal int bloomBufferNameID;
-
+#if UNITY_2018_2_OR_NEWER
+        internal bool physicalCamera;
+#endif
         public void Reset()
         {
             m_Camera = null;
@@ -144,7 +146,9 @@ public void Reset()
 #if UNITY_2017_2_OR_NEWER
             m_sourceDescriptor = new RenderTextureDescriptor(0, 0);
 #endif
-
+#if UNITY_2018_2_OR_NEWER
+            physicalCamera = false;
+#endif
             stereoActive = false;
             xrActiveEye = (int)Camera.StereoscopicEye.Left;
             screenWidth = 0;

PostProcessing/Runtime/Utils/RuntimeUtilities.cs

@@ -576,44 +576,22 @@ public static float Exp2(float x)
             return Mathf.Exp(x * 0.69314718055994530941723212145818f);
         }
 
-        // Adapted heavily from PlayDead's TAA code
-        // https://github.com/playdeadgames/temporal/blob/master/Assets/Scripts/Extensions.cs
+
         public static Matrix4x4 GetJitteredPerspectiveProjectionMatrix(Camera camera, Vector2 offset)
         {
-            float vertical = Mathf.Tan(0.5f * Mathf.Deg2Rad * camera.fieldOfView);
-            float horizontal = vertical * camera.aspect;
             float near = camera.nearClipPlane;
-            float far = camera.farClipPlane;
-
-            offset.x *= horizontal / (0.5f * camera.pixelWidth);
-            offset.y *= vertical / (0.5f * camera.pixelHeight);
-
-            float left = (offset.x - horizontal) * near;
-            float right = (offset.x + horizontal) * near;
-            float top = (offset.y + vertical) * near;
-            float bottom = (offset.y - vertical) * near;
-
-            var matrix = new Matrix4x4();
+			float far = camera.farClipPlane;
 
-            matrix[0, 0] = (2f * near) / (right - left);
-            matrix[0, 1] = 0f;
-            matrix[0, 2] = (right + left) / (right - left);
-            matrix[0, 3] = 0f;
+			float vertical = Mathf.Tan(0.5f * Mathf.Deg2Rad * camera.fieldOfView) * near;
+			float horizontal = vertical * camera.aspect;
 
-            matrix[1, 0] = 0f;
-            matrix[1, 1] = (2f * near) / (top - bottom);
-            matrix[1, 2] = (top + bottom) / (top - bottom);
-            matrix[1, 3] = 0f;
+			offset.x *= horizontal / (0.5f * camera.pixelWidth);
+			offset.y *= vertical / (0.5f * camera.pixelHeight);
 
-            matrix[2, 0] = 0f;
-            matrix[2, 1] = 0f;
-            matrix[2, 2] = -(far + near) / (far - near);
-            matrix[2, 3] = -(2f * far * near) / (far - near);
+			var matrix = camera.projectionMatrix;
 
-            matrix[3, 0] = 0f;
-            matrix[3, 1] = 0f;
-            matrix[3, 2] = -1f;
-            matrix[3, 3] = 0f;
+			matrix[0, 2] += offset.x / horizontal;
+			matrix[1, 2] += offset.y / vertical;
 
             return matrix;
         }