OGRE  2.2.4
Object-Oriented Graphics Rendering Engine
Public Member Functions | List of all members
Ogre::CompositorPassCompute Class Reference
Core » Effects

Implementation of CompositorPass This implementation will render a fullscreen triangle/quad to the RenderTarget using the parameters from definition (rectangle area, whether triangle or quad pass, whether to include frustum corners, etc) More...

#include <OgreCompositorPassCompute.h>

+ Inheritance diagram for Ogre::CompositorPassCompute:

Public Member Functions

 CompositorPassCompute (const CompositorPassComputeDef *definition, Camera *defaultCamera, CompositorNode *parentNode, const RenderTargetViewDef *rtv)
 
virtual ~CompositorPassCompute ()
 
virtual void _placeBarriersAndEmulateUavExecution (BoundUav boundUavs[64], ResourceAccessMap &uavsAccess, ResourceLayoutMap &resourcesLayout)
 Emulates the execution of a UAV to understand memory dependencies, and adds a memory barrier / resource transition if we need to. More...
 
void _removeAllBarriers (void)
 
void addResourceTransition (ResourceLayoutMap::iterator currentLayout, ResourceLayout::Layout newLayout, uint32 readBarrierBits)
 
virtual void execute (const Camera *lodCamera)
 
Vector2 getActualDimensions (void) const
 
const CompositorPassDef * getDefinition (void) const
 
const CompositorNode * getParentNode (void) const
 
RenderPassDescriptor * getRenderPassDesc (void) const
 
const CompositorTextureVec & getTextureDependencies (void) const
 
CompositorPassType getType () const
 
virtual void notifyCleared (void)
 CompositorNode::_notifyCleared More...
 
virtual void notifyDestroyed (TextureGpu *channel)
 CompositorNode::notifyDestroyed More...
 
virtual void notifyDestroyed (const UavBufferPacked *buffer)
 
virtual bool notifyRecreated (const TextureGpu *channel)
 CompositorNode::notifyRecreated More...
 
virtual void notifyRecreated (const UavBufferPacked *oldBuffer, UavBufferPacked *newBuffer)
 
void operator delete (void *ptr)
 
void operator delete (void *ptr, void *)
 
void operator delete (void *ptr, const char *, int, const char *)
 
void operator delete[] (void *ptr)
 
void operator delete[] (void *ptr, const char *, int, const char *)
 
void * operator new (size_t sz, const char *file, int line, const char *func)
 operator new, with debug line info More...
 
void * operator new (size_t sz)
 
void * operator new (size_t sz, void *ptr)
 placement operator new More...
 
void * operator new[] (size_t sz, const char *file, int line, const char *func)
 array operator new, with debug line info More...
 
void * operator new[] (size_t sz)
 
void profilingBegin (void)
 
void profilingEnd (void)
 
virtual void resetNumPassesLeft (void)
 

Detailed Description

Implementation of CompositorPass This implementation will render a fullscreen triangle/quad to the RenderTarget using the parameters from definition (rectangle area, whether triangle or quad pass, whether to include frustum corners, etc)

A fullscreen quad are two triangles that form a rectangle, which cover the entire screen. This is however an inefficient way of harnessing the GPU's power. Modern GPUs iterate a whole bounding rect that encloses each triangle (it's highly more parallelizable & scalable than the scanline algorithm used by older Voodoo cards in the 90's). That means we're wasting 50% of GPU reasources in pixels that aren't drawn.
A much faster approach made famous by Emil Persson (see max area triangulation http://www.humus.name/index.php?page=News&ID=228) is to render a single oversized triangle that covers the entire screen, which has it's UV scaled up; so that when interpolated at screen position, it appears it goes from the range [0; 1) like a regular quad pass. The difference is that pixels that go past the viewport are much better clipped/earlied-out by the GPU than those that fall inside the viewport but outside the triangle (like the rectangle approach)
This faster technique only works for passes that cover the entire screen. When the viewport is not 0 0 1 1; the CompositorPassCompute automatically switches to a fullscreen quad.
IMPORTANT: The texel-to-pixel adjustment offset is included in the world matrix passed to the vertex shader. This differs from Ogre 1.x which tried to embed the offset into the vertices.
IMPORTANT: When the viewport is not 0 0 1 1; the scale & position factors are passed through the world matrix. This behavior differs from Ogre 1.x
Author
Matias N. Goldberg
Version
1.0

Constructor & Destructor Documentation

◆ CompositorPassCompute()

Ogre::CompositorPassCompute::CompositorPassCompute ( const CompositorPassComputeDef *  definition,
Camera *  defaultCamera,
CompositorNode *  parentNode,
const RenderTargetViewDef *  rtv 
)

◆ ~CompositorPassCompute()

virtual Ogre::CompositorPassCompute::~CompositorPassCompute ( )
virtual

Member Function Documentation

◆ _placeBarriersAndEmulateUavExecution()

virtual void Ogre::CompositorPassCompute::_placeBarriersAndEmulateUavExecution ( BoundUav  boundUavs[64],
ResourceAccessMap &  uavsAccess,
ResourceLayoutMap &  resourcesLayout 
)
virtual

Emulates the execution of a UAV to understand memory dependencies, and adds a memory barrier / resource transition if we need to.

Remarks
Note that an UAV->UAV resource transition is just a memory barrier.
Parameters
boundUavs[in/out] An array of the currently bound UAVs by slot. The derived class CompositorPassUav will write to them as part of the emulation. The base implementation reads from this value.
uavsAccess[in/out] A map with the last access flag used for each RenderTarget. We need it to identify RaR situations, which are the only ones that don't need a barrier (and also WaW hazards, when explicitly allowed by the pass). Note: We will set the access to ResourceAccess::Undefined to signal other passes that the UAV hazard already has a barrier (just in case there was one already created).
resourcesLayout[in/out] A map with the current layout of every RenderTarget used so far. Needed to identify if we need to change the resource layout to an UAV.

Reimplemented from Ogre::CompositorPass.

◆ _removeAllBarriers()

void Ogre::CompositorPass::_removeAllBarriers ( void  )
inherited

◆ addResourceTransition()

void Ogre::CompositorPass::addResourceTransition ( ResourceLayoutMap::iterator  currentLayout,
ResourceLayout::Layout  newLayout,
uint32  readBarrierBits 
)
inherited

◆ execute()

virtual void Ogre::CompositorPassCompute::execute ( const Camera *  lodCamera)
virtual

Implements Ogre::CompositorPass.

◆ getActualDimensions()

Vector2 Ogre::CompositorPass::getActualDimensions ( void  ) const
inherited

◆ getDefinition()

const CompositorPassDef* Ogre::CompositorPass::getDefinition ( void  ) const
inlineinherited

◆ getParentNode()

const CompositorNode* Ogre::CompositorPass::getParentNode ( void  ) const
inlineinherited

◆ getRenderPassDesc()

RenderPassDescriptor* Ogre::CompositorPass::getRenderPassDesc ( void  ) const
inlineinherited

◆ getTextureDependencies()

const CompositorTextureVec& Ogre::CompositorPass::getTextureDependencies ( void  ) const
inlineinherited

◆ getType()

CompositorPassType Ogre::CompositorPass::getType ( void  ) const
inlineinherited

◆ notifyCleared()

virtual void Ogre::CompositorPass::notifyCleared ( void  )
virtualinherited

CompositorNode::_notifyCleared

Reimplemented in Ogre::CompositorPassScene.

◆ notifyDestroyed() [1/2]

virtual void Ogre::CompositorPass::notifyDestroyed ( TextureGpu *  channel)
virtualinherited

CompositorNode::notifyDestroyed

◆ notifyDestroyed() [2/2]

virtual void Ogre::CompositorPass::notifyDestroyed ( const UavBufferPacked *  buffer)
virtualinherited

◆ notifyRecreated() [1/2]

virtual bool Ogre::CompositorPass::notifyRecreated ( const TextureGpu *  channel)
virtualinherited

CompositorNode::notifyRecreated

Reimplemented in Ogre::CompositorPassIblSpecular, and Ogre::CompositorPassMipmap.

◆ notifyRecreated() [2/2]

virtual void Ogre::CompositorPass::notifyRecreated ( const UavBufferPacked *  oldBuffer,
UavBufferPacked *  newBuffer 
)
virtualinherited

Reimplemented in Ogre::CompositorPassUav.

◆ operator delete() [1/3]

template<class Alloc >
void Ogre::AllocatedObject< Alloc >::operator delete ( void *  ptr)
inlineinherited

◆ operator delete() [2/3]

template<class Alloc >
void Ogre::AllocatedObject< Alloc >::operator delete ( void *  ptr,
void *   
)
inlineinherited

◆ operator delete() [3/3]

template<class Alloc >
void Ogre::AllocatedObject< Alloc >::operator delete ( void *  ptr,
const char *  ,
int  ,
const char *   
)
inlineinherited

◆ operator delete[]() [1/2]

template<class Alloc >
void Ogre::AllocatedObject< Alloc >::operator delete[] ( void *  ptr)
inlineinherited

◆ operator delete[]() [2/2]

template<class Alloc >
void Ogre::AllocatedObject< Alloc >::operator delete[] ( void *  ptr,
const char *  ,
int  ,
const char *   
)
inlineinherited

◆ operator new() [1/3]

template<class Alloc >
void* Ogre::AllocatedObject< Alloc >::operator new ( size_t  sz,
const char *  file,
int  line,
const char *  func 
)
inlineinherited

operator new, with debug line info

◆ operator new() [2/3]

template<class Alloc >
void* Ogre::AllocatedObject< Alloc >::operator new ( size_t  sz)
inlineinherited

◆ operator new() [3/3]

template<class Alloc >
void* Ogre::AllocatedObject< Alloc >::operator new ( size_t  sz,
void *  ptr 
)
inlineinherited

placement operator new

◆ operator new[]() [1/2]

template<class Alloc >
void* Ogre::AllocatedObject< Alloc >::operator new[] ( size_t  sz,
const char *  file,
int  line,
const char *  func 
)
inlineinherited

array operator new, with debug line info

◆ operator new[]() [2/2]

template<class Alloc >
void* Ogre::AllocatedObject< Alloc >::operator new[] ( size_t  sz)
inlineinherited

◆ profilingBegin()

void Ogre::CompositorPass::profilingBegin ( void  )
inherited

◆ profilingEnd()

void Ogre::CompositorPass::profilingEnd ( void  )
inherited

◆ resetNumPassesLeft()

virtual void Ogre::CompositorPass::resetNumPassesLeft ( void  )
virtualinherited

Reimplemented in Ogre::CompositorPassIblSpecular.

The documentation for this class was generated from the following file: