Do no longer re-calculate md2 frames when they don't change (thx @npc for reporting)

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@5227 dfc29bdd-3216-0410-991c-e03cc46cb475

changes.txt

 --------------------------
 Changes in 1.9 (not yet released)
 
+- Do no longer re-calculate md2 frames when they don't change (thx @npc for reporting)
 - Add multibyteToWString wrapper functions around mbstowcs which work with Irrlicht string class.
 - Fix: addFileArchive now grab()'s the archive when you pass one in by pointer.
 - Fix: Prevent division by 0 in CGUIScrollBar::setPos

source/Irrlicht/CAnimatedMeshMD2.cpp

@@ -219,7 +219,8 @@ static const SMD2AnimationType MD2AnimationTypeList[21] =
 
 //! constructor
 CAnimatedMeshMD2::CAnimatedMeshMD2()
-	: InterpolationBuffer(0), FrameList(0), FrameCount(0), FramesPerSecond((f32)(MD2AnimationTypeList[0].fps << MD2_FRAME_SHIFT))
+	: InterpolationBuffer(0), InterpolationFirstFrame(-1), InterpolationSecondFrame(-1), InterpolationFrameDiv(0.f)
+	, FrameList(0), FrameCount(0), FramesPerSecond((f32)(MD2AnimationTypeList[0].fps << MD2_FRAME_SHIFT))
 {
 	#ifdef _DEBUG
 	IAnimatedMesh::setDebugName("CAnimatedMeshMD2 IAnimatedMesh");
@@ -320,6 +321,12 @@ void CAnimatedMeshMD2::updateInterpolationBuffer(s32 frame, s32 startFrameLoop,
 		div = frame * MD2_FRAME_SHIFT_RECIPROCAL;
 	}
 
+	if ( firstFrame != InterpolationFirstFrame || secondFrame != InterpolationSecondFrame || div != InterpolationFrameDiv )
+	{
+		InterpolationFirstFrame = firstFrame;
+		InterpolationSecondFrame = secondFrame;
+		InterpolationFrameDiv = div;
+
 		video::S3DVertex* target = static_cast<video::S3DVertex*>(InterpolationBuffer->getVertices());
 		SMD2Vert* first = FrameList[firstFrame].pointer();
 		SMD2Vert* second = FrameList[secondFrame].pointer();
@@ -352,6 +359,7 @@ void CAnimatedMeshMD2::updateInterpolationBuffer(s32 frame, s32 startFrameLoop,
 		//update bounding box
 		InterpolationBuffer->setBoundingBox(BoxList[secondFrame].getInterpolated(BoxList[firstFrame], div));
 		InterpolationBuffer->setDirty();
+	}
 }
 
 

source/Irrlicht/CAnimatedMeshMD2.h

@@ -102,6 +102,10 @@ namespace scene
 		//! the buffer that contains the most recent animation
 		SMeshBuffer* InterpolationBuffer;
 
+		//! Frames used to calculate InterpolationBuffer
+		u32 InterpolationFirstFrame, InterpolationSecondFrame;
+		f32 InterpolationFrameDiv;
+
 		//! named animations
 		struct SAnimationData
 		{