Model Class Reference

#include <opengl_utils.hpp>

Collaboration diagram for Model:

Public Member Functions
	Model ()=default
	Model (const Model &)=delete
	Model (Model &&o)
	~Model ()
GLuint	get_vao () const
Model &	operator= (const Model &)=delete
Model &	operator= (Model &&o)
void	render ()

Static Public Member Functions
static Model	get_quad ()
static Model	get_sphere ()

Private Member Functions
void	swap (Model &o)

Private Attributes
GLuint	elem_buf = 0
GLsizei	indices_num = 0
GLuint	vao = 0
GLuint	vbo = 0

Detailed Description

RAII wrapper for OpenGL VBO and VAO containing a 3D model

Definition at line 102 of file opengl_utils.hpp.

Constructor & Destructor Documentation

Model() [1/3]

Model::Model ( )

default

Model() [2/3]

Model::Model ( const Model & )

delete

Model() [3/3]

Model::Model ( Model && o )

inline

Definition at line 106 of file opengl_utils.hpp.

{ swap(o); }

References swap().

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~Model()

Model::~Model

(

)

Definition at line 133 of file opengl_utils.cpp.

             {
        if(vao == 0)
                return;
 
        glDeleteBuffers(1, &vbo);
        glDeleteBuffers(1, &elem_buf);
        glDeleteVertexArrays(1, &vao);
}

References elem_buf, vao, and vbo.

Member Function Documentation

get_quad()

Model Model::get_quad ( )

static

Returns an instance containing a plane formed by 2 triangles

Definition at line 198 of file opengl_utils.cpp.

                     {
        Model model;
        glGenVertexArrays(1, &model.vao);
        glBindVertexArray(model.vao);
 
        glGenBuffers(1, &model.vbo);
        glBindBuffer(GL_ARRAY_BUFFER, model.vbo);
        glBufferData(GL_ARRAY_BUFFER, sizeof(rectangle), rectangle, GL_STATIC_DRAW);
 
        glEnableVertexAttribArray(0);
        glBindBuffer(GL_ARRAY_BUFFER, model.vbo);
        glVertexAttribPointer(
                        0,
                        2,
                        GL_FLOAT,
                        GL_FALSE,
                        4 * sizeof(float),
                        (void*)0
                        );
        glEnableVertexAttribArray(1);
        glBindBuffer(GL_ARRAY_BUFFER, model.vbo);
        glVertexAttribPointer(
                        1,
                        2,
                        GL_FLOAT,
                        GL_FALSE,
                        4 * sizeof(float),
                        (void*)(2 * sizeof(float))
                        );
 
        glBindVertexArray(0);
        model.indices_num = 6;
 
        return model;
}

References indices_num, rectangle, vao, and vbo.

Referenced by FlatVideoScene::init().

get_sphere()

Model Model::get_sphere ( )

static

Returns an instance containing a 3D sphere

Definition at line 155 of file opengl_utils.cpp.

                       {
        Model model;
        glGenVertexArrays(1, &model.vao);
        glBindVertexArray(model.vao);
 
        auto vertices = gen_sphere_vertices(1, 64, 64);
        auto indices = gen_sphere_indices(64, 64);
 
        glGenBuffers(1, &model.vbo);
        glBindBuffer(GL_ARRAY_BUFFER, model.vbo);
        glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(float), vertices.data(), GL_STATIC_DRAW);
 
        glGenBuffers(1, &model.elem_buf);
        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, model.elem_buf);
        glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(unsigned), indices.data(), GL_STATIC_DRAW);
 
        glEnableVertexAttribArray(0);
        glBindBuffer(GL_ARRAY_BUFFER, model.vbo);
        glVertexAttribPointer(
                        0,
                        3,
                        GL_FLOAT,
                        GL_FALSE,
                        5 * sizeof(float),
                        (void*)0
                        );
        glEnableVertexAttribArray(1);
        glBindBuffer(GL_ARRAY_BUFFER, model.vbo);
        glVertexAttribPointer(
                        1,
                        2,
                        GL_FLOAT,
                        GL_FALSE,
                        5 * sizeof(float),
                        (void*)(3 * sizeof(float))
                        );
 
        glBindVertexArray(0);
        model.indices_num = indices.size();
 
        return model;
}

References elem_buf, gen_sphere_indices(), gen_sphere_vertices(), indices_num, vao, and vbo.

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get_vao()

GLuint Model::get_vao ( ) const

inline

Return the underlying OpenGL VAO id

Definition at line 114 of file opengl_utils.hpp.

{ return vao; }

References vao.

operator=() [1/2]

Model & Model::operator= ( const Model & )

delete

operator=() [2/2]

Model & Model::operator= ( Model && o )

inline

Definition at line 108 of file opengl_utils.hpp.

{ swap(o); return *this; }

References swap().

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render()

void Model::render

(

)

Renders the contained model by calling glDrawElements or glDrawArrays

Definition at line 142 of file opengl_utils.cpp.

                  {
        PROFILE_FUNC;
 
        glBindVertexArray(vao);
        if(elem_buf != 0){
                glDrawElements(GL_TRIANGLES, indices_num, GL_UNSIGNED_INT, (void *) 0);
        } else {
                glDrawArrays(GL_TRIANGLES, 0, indices_num);
        }
 
        glBindVertexArray(0);
}

References elem_buf, indices_num, PROFILE_FUNC, and vao.

Referenced by FlatVideoScene::render(), and PanoramaScene::render().

swap()

void Model::swap ( Model & o )

inlineprivate

Definition at line 132 of file opengl_utils.hpp.

                           {
                std::swap(vao, o.vao);
                std::swap(vbo, o.vbo);
                std::swap(elem_buf, o.elem_buf);
                std::swap(indices_num, o.indices_num);
        }

References elem_buf, indices_num, vao, and vbo.

Referenced by Model(), and operator=().

Member Data Documentation

elem_buf

GLuint Model::elem_buf = 0

private

Definition at line 140 of file opengl_utils.hpp.

Referenced by ~Model(), get_sphere(), render(), and swap().

indices_num

GLsizei Model::indices_num = 0

private

Definition at line 141 of file opengl_utils.hpp.

Referenced by get_quad(), get_sphere(), render(), and swap().

vao

GLuint Model::vao = 0

private

Definition at line 138 of file opengl_utils.hpp.

Referenced by ~Model(), get_quad(), get_sphere(), get_vao(), render(), and swap().

vbo

GLuint Model::vbo = 0

private

Definition at line 139 of file opengl_utils.hpp.

Referenced by ~Model(), get_quad(), get_sphere(), and swap().

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

• src/video_display/opengl_utils.hpp
• src/video_display/opengl_utils.cpp