Camera Component, Editor Viewport Widget refactoring.

Merge pull request #2840 from yuriy0/camera_and_editor_viewport_widget_improvements

Code/Framework/AzCore/AzCore/Math/MatrixUtils.cpp

@@ -44,6 +44,22 @@ namespace AZ
         return &out;
     }
 
+    void SetPerspectiveMatrixFOV(Matrix4x4& out, float fovY, float aspectRatio)
+    {
+        float sinFov, cosFov;
+        SinCos(0.5f * fovY, sinFov, cosFov);
+        float yScale = cosFov / sinFov; //cot(fovY/2)
+        float xScale = yScale / aspectRatio;
+
+        out.SetElement(0, 0, xScale);
+        out.SetElement(1, 1, yScale);
+    }
+
+    float GetPerspectiveMatrixFOV(const Matrix4x4& m)
+    {
+        return 2.0 * AZStd::atan(1.0f / m.GetElement(1, 1));
+    }
+
     Matrix4x4* MakeFrustumMatrixRH(Matrix4x4& out, float left, float right, float bottom, float top, float nearDist, float farDist, bool reverseDepth)
     {
         AZ_Assert(right > left, "right should be greater than left");

Code/Framework/AzCore/AzCore/Math/MatrixUtils.h

@@ -64,4 +64,8 @@ namespace AZ
     //! Transforms a position by a matrix. This function can be used with any generic cases which include projection matrices.
     Vector3 MatrixTransformPosition(const Matrix4x4& matrix, const Vector3& inPosition);
 
+
+    void SetPerspectiveMatrixFOV(Matrix4x4& out, float fovY, float aspectRatio);
+    float GetPerspectiveMatrixFOV(const Matrix4x4& m);
+
 } // namespace AZ

Code/Framework/AzFramework/AzFramework/Components/CameraBus.h

@@ -114,6 +114,9 @@ namespace Camera
         //! Makes the camera the active view
         virtual void MakeActiveView() = 0;
 
+        //! Check if this camera is the active render camera
+        virtual bool IsActiveView() = 0;
+
         //! Get the camera frustum's aggregate configuration
         virtual Configuration GetCameraConfiguration() 
         {