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Don't evaluate the ActorScroller transform function every time though Draw.

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Cache TweenState values at a provided interval, then interpolate between the TweenStates.
TODO: Precalculate these TweenStates in Init?
This commit is contained in:
Chris Danford
2005-09-02 21:42:34 +00:00
parent 2bfa9b23dd
commit f55e8a54e6
8 changed files with 79 additions and 3 deletions
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stepmania/src/ActorScroller.cpp
+40 -3
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@@ -39,6 +39,8 @@ ActorScroller::ActorScroller()
m_quadMask.SetBlendMode( BLEND_NO_EFFECT ); // don't change color values
m_quadMask.SetUseZBuffer( true ); // we want to write to the Zbuffer
m_quadMask.SetHidden( true );
m_iSubdivisions = 1;
}
void ActorScroller::Load2(
@@ -62,6 +64,7 @@ void ActorScroller::Load2(
m_exprTransformFunction.SetFromExpression(
ssprintf("function(self,offset,itemIndex,numItems) return self:y(%f*offset) end",fItemHeight)
);
m_iSubdivisions = 1;
m_bLoop = bLoop;
m_fSecondsPerItem = fSecondsPerItem;
@@ -90,6 +93,7 @@ void ActorScroller::Load3(
float fNumItemsToDraw,
bool bFastCatchup,
const CString &sTransformFunction,
int iSubdivisions,
bool bUseMask,
bool bLoop
)
@@ -98,6 +102,7 @@ void ActorScroller::Load3(
m_fNumItemsToDraw = fNumItemsToDraw;
m_bFastCatchup = bFastCatchup;
m_exprTransformFunction.SetFromExpression( sTransformFunction );
m_iSubdivisions = iSubdivisions;
m_fQuantizePixels = 0;
m_bUseMask = bUseMask;
m_bLoop = bLoop;
@@ -131,12 +136,14 @@ void ActorScroller::LoadFromNode( const CString &sDir, const XNode *pNode )
float fItemPaddingStart = 0;
float fItemPaddingEnd = 0;
CString sTransformFunction;
int iSubdivisions = 0;
GET_VALUE( "SecondsPerItem", fSecondsPerItem );
GET_VALUE( "NumItemsToDraw", fNumItemsToDraw );
GET_VALUE( "ItemPaddingStart", fItemPaddingStart );
GET_VALUE( "ItemPaddingEnd", fItemPaddingEnd );
GET_VALUE( "TransformFunction", sTransformFunction );
pNode->GetAttrValue( "Subdivisions", m_iSubdivisions );
#undef GET_VALUE
Load3(
@@ -144,6 +151,7 @@ void ActorScroller::LoadFromNode( const CString &sDir, const XNode *pNode )
fNumItemsToDraw,
false,
sTransformFunction,
iSubdivisions,
false,
false );
SetCurrentAndDestinationItem( -fItemPaddingStart );
@@ -201,18 +209,47 @@ void ActorScroller::UpdateInternal( float fDeltaTime )
m_fCurrentItem = fmodf( m_fCurrentItem, m_fNumItemsToDraw+1 );
}
void ActorScroller::PositionItem( Actor *pActor, float fPositionOffsetFromCenter, int iItemIndex, int iNumItems )
const Actor::TweenState &ActorScroller::GetPosition( float fPositionOffsetFromCenter, int iItemIndex, int iNumItems )
{
PositionOffsetAndItemIndex key = { fPositionOffsetFromCenter, iItemIndex };
map<PositionOffsetAndItemIndex,Actor::TweenState>::iterator iter = m_mapPositionToTweenStateCache.find( key );
if( iter != m_mapPositionToTweenStateCache.end() )
return iter->second;
Actor a;
Lua *L = LUA->Get();
m_exprTransformFunction.PushSelf( L );
ASSERT( !lua_isnil(L, -1) );
pActor->PushSelf( L );
a.PushSelf( L );
LuaHelpers::Push( fPositionOffsetFromCenter, L );
LuaHelpers::Push( iItemIndex, L );
LuaHelpers::Push( iNumItems, L );
lua_call( L, 4, 0 ); // 4 args, 0 results
LUA->Release(L);
return m_mapPositionToTweenStateCache[key] = a.DestTweenState();
}
void ActorScroller::PositionItem( Actor *pActor, float fPositionOffsetFromCenter, int iItemIndex, int iNumItems )
{
float fInterval = 1.0f / m_iSubdivisions;
float fFloor = QuantizeDown( fPositionOffsetFromCenter, fInterval );
float fCeil = QuantizeUp( fPositionOffsetFromCenter, fInterval );
if( fFloor == fCeil )
{
pActor->DestTweenState() = GetPosition( fCeil, iItemIndex, iNumItems );
}
else
{
const Actor::TweenState &tsFloor = GetPosition( fFloor, iItemIndex, iNumItems );
const Actor::TweenState &tsCeil = GetPosition( fCeil, iItemIndex, iNumItems );
float fPercentTowardCeil = SCALE( fPositionOffsetFromCenter, fFloor, fCeil, 0.0f, 1.0f );
Actor::TweenState::MakeWeightedAverage( pActor->DestTweenState(), tsFloor, tsCeil, fPercentTowardCeil );
}
}
void ActorScroller::DrawPrimitives()