ImFusion::GL::ViewState Class Reference

#include <ImFusion/Core/GL/ViewState.h>

Encapsulates the OpenGL view state defined by the viewport, a projection matrix and a model-view matrix. More...

Detailed Description

Encapsulates the OpenGL view state defined by the viewport, a projection matrix and a model-view matrix.

Instances of this class are passed around to provide model-view-projection configuration to consumers such as GL::FixedFunctionPipeline or the GlView framework. Furthermore, it provides a couple of helper functions to convert points/locations between world coordinates and viewport coordinates.

Classes
struct	PixelIncrementWorld
	Helper struct to store the result of unprojectPixelIncrementOrtho() and unprojectPixelIncrementPerspective(). More...

Public Member Functions
	ViewState (const Viewport &viewport, const mat4 &projectionMatrix=mat4::Identity(), const mat4 &modelViewMatrix=mat4::Identity())
	ViewState (const mat4 &projectionMatrix, const mat4 &modelViewMatrix=mat4::Identity())

Properties
const Viewport &	viewport () const
	Returns the viewport.
Viewport &	viewport ()
	Returns the viewport.
void	setViewport (const Viewport &value)
	Sets the viewport.
const mat4 &	projectionMatrix () const
	Returns the projection matrix.
void	setProjectionMatrix (const mat4 &value)
	Sets the projection matrix.
const mat4 &	modelViewMatrix () const
	Returns the model-view matrix.
void	setModelViewMatrix (const mat4 &value)
	Sets the model-view matrix.
const mat4 &	modelViewProjectionMatrix () const
	Returns the full model-view-projection matrix.
const mat4 &	modelViewProjectionMatrixInverse () const
	Returns the inverse of the full model-view-projection matrix.

Convert between world space and viewport space
vec3	project (const vec3 &worldCoord, bool *outOnCameraPlane=nullptr) const
	Project the given point from world space to viewport space.
vec3	unproject (const vec3 &viewportCoord) const
	Unprojects the given point from viewport space to world space.
PixelIncrementWorld	unprojectPixelIncrement (const vec3 &worldCoord) const
	Unprojects a single 2D pixel increment into 3D space.
PixelIncrementWorld	unprojectPixelIncrementOrtho () const
	Unprojects a single 2D pixel increment into 3D space assuming an orthographic projection.
PixelIncrementWorld	unprojectPixelIncrementPerspective (const vec3 &worldCoord) const
	Unprojects a single 2D pixel increment into 3D space relative to the given world coordinate assuming a perspective projection.
vec3	xDir () const
	Return 3D space unit vector pointing in the direction of viewport x-axis.
vec3	yDir () const
	Return 3D space unit vector pointing in the direction of viewport y-axis.
vec3	zDir () const
	Return 3D space unit vector pointing in the direction of viewport z-axis.

Legacy methods
void	setLegacyGlMatrixStack () const
	Sets the legacy GL_PROJECTION and GL_MODELVIEW matrices to the matrices stored in this instance.

Member Function Documentation

project()

vec3 ImFusion::GL::ViewState::project	(	const vec3 &	worldCoord,
		bool *	outOnCameraPlane = nullptr ) const

Project the given point from world space to viewport space.

Note

worldCoord must not lie in the camera plane, i.e. the following must be true: (modelViewProjectionMatrix() * worldCoord.homogeneous())[3] != 0.0 If worldCorld lies on the camera plane, then *outOnCameraPlane is set to true, else it is set to false.

unprojectPixelIncrement()

PixelIncrementWorld ImFusion::GL::ViewState::unprojectPixelIncrement

(

const vec3 &

worldCoord

)

const

Unprojects a single 2D pixel increment into 3D space.

This function will choose between unprojectPixelIncrementOrtho() and unprojectPixelIncrementPerspective() based on the underlying projection matrix.

setLegacyGlMatrixStack()

void ImFusion::GL::ViewState::setLegacyGlMatrixStack

(

)

const

Sets the legacy GL_PROJECTION and GL_MODELVIEW matrices to the matrices stored in this instance.

Warning

Will do nothing if GlContextManager::useCoreContext() is true.

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

• ImFusion/Core/GL/ViewState.h