tweak(fps): Decouple scripted camera movement time step from render update (#1451)

Author: xezon

GeneralsMD/Code/GameEngineDevice/Include/W3DDevice/GameClient/W3DView.h

@@ -61,8 +61,8 @@ typedef struct
 	Real		cameraAngle[MAX_WAYPOINTS+2];	// Camera Angle;
 	Int			timeMultiplier[MAX_WAYPOINTS+2];	// Time speedup factor.
 	Real		groundHeight[MAX_WAYPOINTS+1];	// Ground height.
-	Int			totalTimeMilliseconds;					// Num of ms to do this movement.
-	Int			elapsedTimeMilliseconds;				// Time since start.
+	Real		totalTimeMilliseconds;					// Num of ms to do this movement.
+	Real		elapsedTimeMilliseconds;				// Time since start.
 	Real		totalDistance;								// Total length of paths.
 	Real		curSegDistance;								// How far we are along the current seg.
 	Int			shutter;
@@ -284,7 +284,7 @@ class W3DView : public View, public SubsystemInterface
 	void setCameraTransform( void );								///< set the transform matrix of m_3DCamera, based on m_pos & m_angle
 	void buildCameraTransform( Matrix3D *transform ) ;			///< calculate (but do not set) the transform matrix of m_3DCamera, based on m_pos & m_angle
 	void calcCameraConstraints() ;			///< recalc m_cameraConstraint
-	void moveAlongWaypointPath(Int milliseconds); ///< Move camera along path.
+	void moveAlongWaypointPath(Real milliseconds); ///< Move camera along path.
 	void getPickRay(const ICoord2D *screen, Vector3 *rayStart, Vector3 *rayEnd);	///<returns a line segment (ray) originating at the given screen position
 	void setupWaypointPath(Bool orient);					///< Calculates distances & angles for moving along a waypoint path.
 	void rotateCameraOneFrame(void);							///< Do one frame of a rotate camera movement.
@@ -301,6 +301,6 @@ class W3DView : public View, public SubsystemInterface
 };  // end class W3DView
 
 // EXTERNALS //////////////////////////////////////////////////////////////////////////////////////
-extern Int TheW3DFrameLengthInMsec;	// default is 33msec/frame == 30fps. but we may change it depending on sys config.
+extern Real TheW3DFrameLengthInMsec;
 
 #endif  // end __W3DVIEW_H_

GeneralsMD/Code/GameEngineDevice/Source/W3DDevice/GameClient/W3DView.cpp

@@ -38,6 +38,7 @@
 
 // USER INCLUDES //////////////////////////////////////////////////////////////////////////////////
 #include "Common/BuildAssistant.h"
+#include "Common/GameEngine.h"
 #include "Common/GlobalData.h"
 #include "Common/Module.h"
 #include "Common/RandomValue.h"
@@ -100,7 +101,7 @@
 
 
 // 30 fps
-Int TheW3DFrameLengthInMsec = 1000/LOGICFRAMES_PER_SECOND; // default is 33msec/frame == 30fps. but we may change it depending on sys config.
+Real TheW3DFrameLengthInMsec = MSEC_PER_LOGICFRAME_REAL; // default is 33msec/frame == 30fps. but we may change it depending on sys config.
 static const Int MAX_REQUEST_CACHE_SIZE = 40;	// Any size larger than 10, or examine code below for changes. jkmcd.
 static const Real DRAWABLE_OVERSCAN = 75.0f;  ///< 3D world coords of how much to overscan in the 3D screen region
 
@@ -1053,7 +1054,9 @@ Bool W3DView::updateCameraMovements()
 		didUpdate = true;
 	} else if (m_doingMoveCameraOnWaypointPath) {
 		m_previousLookAtPosition = *getPosition();
-		moveAlongWaypointPath(TheW3DFrameLengthInMsec);
+		// TheSuperHackers @tweak The scripted camera movement is now decoupled from the render update.
+		const Real logicTimeScaleOverFpsRatio = TheGameEngine->getActualLogicTimeScaleOverFpsRatio();
+		moveAlongWaypointPath(TheW3DFrameLengthInMsec * logicTimeScaleOverFpsRatio);
 		didUpdate = true;
 	}
 	if (m_doingScriptedCameraLock)
@@ -3092,7 +3095,7 @@ void W3DView::pitchCameraOneFrame(void)
 
 // ------------------------------------------------------------------------------------------------
 // ------------------------------------------------------------------------------------------------
-void W3DView::moveAlongWaypointPath(Int milliseconds)
+void W3DView::moveAlongWaypointPath(Real milliseconds)
 {
 	m_mcwpInfo.elapsedTimeMilliseconds += milliseconds;
 	if (TheGlobalData->m_disableCameraMovement) {