A screenquad for drawing textures onto quads for projection. More...

#include <ScreenQuad.h>

Public Member Functions
	ScreenQuad ()
	ctor
	ScreenQuad (const float &_x, const float &_y, const float &_extent, const float &_depth)
	construct our screen quad with screen pos and extent
	~ScreenQuad ()
	dtor
void	genVAO ()
void	draw (const std::string &_shaderName, unsigned int &_vao)
	draw the quad
Private Attributes
float	m_x
	quad screen x value
float	m_y
	quad screen y value
float	m_extent
	quads size
float	m_depth
	quad screen z value

Detailed Description

A screenquad for drawing textures onto quads for projection.

Definition at line 14 of file ScreenQuad.h.

Constructor & Destructor Documentation

ScreenQuad::ScreenQuad ( )

ctor

Definition at line 11 of file ScreenQuad.cpp.

{}

ScreenQuad::ScreenQuad	(	const float &	_x,
		const float &	_y,
		const float &	_extent,
		const float &	_depth
	)

construct our screen quad with screen pos and extent

Parameters:

[in]	_x	screen X
[in]	_y	screen Y
[in]	_extent	size of quad
[in]	_depth	the screen depth

Definition at line 12 of file ScreenQuad.cpp.

References m_depth, m_extent, m_x, and m_y.

{
    m_x = _x;
    m_y = _y;
    m_depth = _depth;
    m_extent = _extent;
}

ScreenQuad::~ScreenQuad ( )

dtor

Definition at line 19 of file ScreenQuad.cpp.

{}

Member Function Documentation

void ScreenQuad::draw	(	const std::string &	_shaderName,
		unsigned int &	_vao
	)

draw the quad

Parameters:

[in]	_shaderName	our screenquad shader
[in]	_our	screenquad vao id

Definition at line 21 of file ScreenQuad.cpp.

References m_depth, m_extent, m_x, and m_y.

{
    ngl::ShaderManager *shader = ngl::ShaderManager::instance();
    (*shader)[_shaderName]->use();

    shader->setShaderParam4f(_shaderName, "u_CentreDepthExtent",
                             m_x,
                             m_y,
                             m_depth,
                             m_extent);

    // now we bind back our vertex array object and draw
    glBindVertexArray(_vao);    // select first VAO

    glDrawArrays(GL_QUADS, 0, 4); // draw first object

    // go back to default just incase
    glEnableVertexAttribArray(0);
    glBindVertexArray(0);
}

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