CutawaySurface Class Reference

#include <CutawaySurface.h>

Public Member Functions
void	init (int w, int h, float z_near, float z_far, float angle, float cut)
void	update (int w, int h, float z_near, float z_far, float angle, float c)
void	prepareZBufferPass ()
void	endZBufferPass ()
void	quadPass (int step, glm::mat4 &vp)
void	prepareRenderPass (int unit)
glm::vec2	getDimension ()
GLuint	getTextureHandle (int tex)
GLuint	getFBOHandle (int fbo)
void	clearBuffers ()

Public Attributes
ZBufferShader *	z_buffer_shader
Quad *	quad
QuadShader *	quad_shader
float	cut

Detailed Description

Creation of cutaway surface and usage of resulting frame buffer objects or textures.

Member Function Documentation

void CutawaySurface::clearBuffers

(

)

Clear all used frame buffer objects and reset binding.

void CutawaySurface::endZBufferPass

(

)

Reset to default frame buffer object and appropriate OpenGL depth test.

vec2 CutawaySurface::getDimension

(

)

Dimension of cutaway surface plane in screen coordinates.

Returns

2D vector of cutaway surface plane dimension

GLuint CutawaySurface::getFBOHandle

(

int

fbo

)

Return frame buffer object handle according to index.

Parameters

fbo	frame buffer object index

Returns

frame buffer object handle according to index

GLuint CutawaySurface::getTextureHandle

(

int

tex

)

Return texture handle according to index.

Parameters

tex	texture index

Returns

texture handle according to index

void CutawaySurface::init	(	int	w,
		int	h,
		float	z_near,
		float	z_far,
		float	angle,
		float	cut
	)

Init two frame buffer objects and attached textures and create z buffer shader and quad shader.

Parameters

w	width of cutaway surface in screen coordinates
h	height of cutaway surface in screen coordinates
z_near	distance of near plane
z_far	distance of far plane
angle	drill angle of cutaway surface cones
cut	true if intersection with cutaway surfaces should be performed

void CutawaySurface::prepareRenderPass

(

int

unit

)

Prepare for rendering. Activate texture unit and choose right texture of frame buffer objects which is generated in last quad pass.

Parameters

unit	texture unit to activate

void CutawaySurface::prepareZBufferPass

(

)

Clear frame buffer object 1 and set appropriate OpenGL depth test.

void CutawaySurface::quadPass	(	int	step,
		glm::mat4 &	vp
	)

Bind QuadShader to execute one round of jump flooding. Switch between two frame buffer objects back and forth in every pass.

Parameters

step	step size of current jump flooding iteration
vp	current view projection matrix

void CutawaySurface::update	(	int	w,
		int	h,
		float	z_near,
		float	z_far,
		float	angle,
		float	c
	)

Update z buffer shader and quad shader.

Parameters

w	width of cutaway surface in screen coordinates
h	height of cutaway surface in screen coordinates
z_near	distance of near plane
z_far	distance of far plane
angle	drill angle of cutaway surface cones
cut	true if intersection with cutaway surfaces should be performed

Member Data Documentation

float CutawaySurface::cut

Flag that defines if intersection with cutaway surface should be performed.

Quad* CutawaySurface::quad

Quad used for neighbour coordinate interpolation.

QuadShader* CutawaySurface::quad_shader

Quad shader that implements the jump flood algorithm.

ZBufferShader* CutawaySurface::z_buffer_shader

Z buffer shader used for depth image calculation. Draws backfaces in depth image.

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

• VisPro/CutawaySurface.h
• VisPro/CutawaySurface.cpp