//-----------------------------------------------------------------------------------
void CompositorPass::addResourceTransition( ResourceLayoutMap::iterator currentLayout,
ResourceLayout::Layout newLayout,
uint32 readBarrierBits )
{
ResourceTransition transition;
//transition.resource = ; TODO
transition.oldLayout = currentLayout->second;
transition.newLayout = newLayout;
transition.writeBarrierBits = transitionWriteBarrierBits( transition.oldLayout );
transition.readBarrierBits = readBarrierBits;
RenderSystem *renderSystem = mParentNode->getRenderSystem();
const RenderSystemCapabilities *caps = renderSystem->getCapabilities();
if( !caps->hasCapability( RSC_EXPLICIT_API ) )
{
//OpenGL. Merge the bits and use only one global barrier.
//Keep the extra barriers uninitialized for debugging purposes,
//but we won't be really using them.
if( mResourceTransitions.empty() )
{
ResourceTransition globalBarrier;
globalBarrier.oldLayout = ResourceLayout::Undefined;
globalBarrier.newLayout = ResourceLayout::Undefined;
globalBarrier.writeBarrierBits = transition.writeBarrierBits;
globalBarrier.readBarrierBits = transition.readBarrierBits;
globalBarrier.mRsData = 0;
renderSystem->_resourceTransitionCreated( &globalBarrier );
mResourceTransitions.push_back( globalBarrier );
}
else
{
ResourceTransition &globalBarrier = mResourceTransitions.front();
renderSystem->_resourceTransitionDestroyed( &globalBarrier );
globalBarrier.writeBarrierBits |= transition.writeBarrierBits;
globalBarrier.readBarrierBits |= transition.readBarrierBits;
renderSystem->_resourceTransitionCreated( &globalBarrier );
}
mNumValidResourceTransitions = 1;
}
else
{
//D3D12, Vulkan, Mantle. Takes advantage of per-resource barriers
renderSystem->_resourceTransitionCreated( &transition );
++mNumValidResourceTransitions;
}
mResourceTransitions.push_back( transition );
currentLayout->second = transition.newLayout;
}
//-----------------------------------------------------------------------------------
void CompositorPass::_removeAllBarriers(void)
{
assert( mNumValidResourceTransitions <= mResourceTransitions.size() );
RenderSystem *renderSystem = mParentNode->getRenderSystem();
ResourceTransitionVec::iterator itor = mResourceTransitions.begin();
for( size_t i=0; i<mNumValidResourceTransitions; ++i )
{
renderSystem->_resourceTransitionDestroyed( &(*itor) );
++itor;
}
mNumValidResourceTransitions = 0;
mResourceTransitions.clear();
}