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)

	~CompositorPassCompute () override

void	execute (const Camera *lodCamera) override

Public Member Functions inherited from Ogre::CompositorPass
	CompositorPass (const CompositorPassDef definition, CompositorNode parentNode)

virtual	~CompositorPass ()

ResourceTransitionArray &	_getResourceTransitionsNonConst ()

virtual void	analyzeBarriers (const bool bClearBarriers=true)
	Bakes all of the memory barriers / resource transition that will be needed before executing a GPU command like rendering, copying/blit or compute. More...

Vector2	getActualDimensions () const

const CompositorPassDef *	getDefinition () const

const CompositorNode *	getParentNode () const

RenderPassDescriptor *	getRenderPassDesc () const

const ResourceTransitionArray &	getResourceTransitions () const

const CompositorTextureVec &	getTextureDependencies () const

CompositorPassType	getType () const

Real	getViewportAspectRatio (size_t vpIdx)

virtual void	notifyCleared ()

virtual void	notifyDestroyed (const UavBufferPacked *buffer)

virtual void	notifyDestroyed (TextureGpu *channel)

virtual bool	notifyRecreated (const TextureGpu *channel)

virtual void	notifyRecreated (const UavBufferPacked oldBuffer, UavBufferPacked newBuffer)

void	profilingBegin ()

void	profilingEnd ()

virtual void	resetNumPassesLeft ()

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()

Ogre::CompositorPassCompute::~CompositorPassCompute ( )

override

Member Function Documentation

◆ execute()

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

overridevirtual

Implements Ogre::CompositorPass.

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