DrawInstanceID Class Reference

Inheritance diagram for DrawInstanceID:

Public Member Functions
int	init ()
	a deriver pour creer les objets openGL. renvoie -1 pour indiquer une erreur, 0 sinon.
int	quit ()
	a deriver pour detruire les objets openGL. renvoie -1 pour indiquer une erreur, 0 sinon.
int	update (const float time, const float delta)
	a deriver et redefinir pour animer les objets en fonction du temps.
int	render ()
	a deriver pour afficher les objets. renvoie 1 pour continuer, 0 pour fermer l'application.
Public Member Functions inherited from App
	App (const int width, const int height, const int major=3, const int minor=3)
	constructeur, dimensions de la fenetre et version d'openGL.
int	run ()
	execution de l'application.

Protected Attributes
Transform	m_model
Orbiter	m_camera
GLuint	m_vao
GLuint	m_buffer
GLuint	m_program
int	m_vertex_count
Protected Attributes inherited from App
Window	m_window
Context	m_context
bool	sync

Additional Inherited Members
Protected Member Functions inherited from App
virtual int	prerender ()
virtual int	postrender ()
void	vsync_off ()

Detailed Description

Definition at line 17 of file tuto6GL.cpp.

Constructor & Destructor Documentation

DrawInstanceID()

DrawInstanceID::DrawInstanceID ( )

inline

Definition at line 21 of file tuto6GL.cpp.

: App(1024, 640) {}

Member Function Documentation

init()

int DrawInstanceID::init ( )

inlinevirtual

a deriver pour creer les objets openGL. renvoie -1 pour indiquer une erreur, 0 sinon.

Implements App.

Definition at line 23 of file tuto6GL.cpp.

    {
        // charge un mesh
        Mesh mesh= read_mesh("data/cube.obj");
        if(mesh.vertex_count() ==0)
            return -1;
        
        Point pmin, pmax;
        mesh.bounds(pmin, pmax);
        m_camera.lookat(pmin - Vector(40, 0, 0), pmax + Vector(40, 0, 0));
        
        m_vertex_count= mesh.vertex_count();
 
        // cree les buffers et le vao
        glGenVertexArrays(1, &m_vao);
        glBindVertexArray(m_vao);
        
        // buffer : positions + normals
        glGenBuffers(1, &m_buffer);
        glBindBuffer(GL_ARRAY_BUFFER, m_buffer);
        
        size_t size= mesh.vertex_buffer_size() + mesh.normal_buffer_size();
        glBufferData(GL_ARRAY_BUFFER, size, nullptr, GL_STATIC_DRAW);
        
        // transfere les positions des sommets
        size_t offset= 0;
        size= mesh.vertex_buffer_size();
        glBufferSubData(GL_ARRAY_BUFFER, offset, size, mesh.vertex_buffer());
        // configure l'attribut 0, vec3 position
        glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, /* stride */ 0, (const GLvoid *) offset);
        glEnableVertexAttribArray(0);
 
        // transfere les normales des sommets
        offset= offset + size;
        size= mesh.normal_buffer_size();
        glBufferSubData(GL_ARRAY_BUFFER, offset, size, mesh.normal_buffer());
        // configure l'attribut 2, vec3 normal
        glVertexAttribPointer(2, 3, GL_FLOAT, GL_FALSE, /* stride */ 0, (const GLvoid *) offset);
        glEnableVertexAttribArray(2);
        
        //
        mesh.release();
        glBindVertexArray(0);
        glBindBuffer(GL_ARRAY_BUFFER, 0);
 
        // shaders
        m_program= read_program("gkit2_tutos/instanceID.glsl");
        program_print_errors(m_program);
        
        // etat openGL par defaut
        glClearColor(0.2f, 0.2f, 0.2f, 1.f);        // couleur par defaut de la fenetre
        
        glClearDepth(1.f);                          // profondeur par defaut
        glDepthFunc(GL_LESS);                       // ztest, conserver l'intersection la plus proche de la camera
        glEnable(GL_DEPTH_TEST);                    // activer le ztest
 
        return 0;   // ras, pas d'erreur
    }

quit()

int DrawInstanceID::quit ( )

inlinevirtual

a deriver pour detruire les objets openGL. renvoie -1 pour indiquer une erreur, 0 sinon.

Implements App.

Definition at line 83 of file tuto6GL.cpp.

    {
        release_program(m_program);
        glDeleteVertexArrays(1, &m_vao);
        glDeleteBuffers(1, &m_buffer);
        return 0;
    }

update()

int DrawInstanceID::update ( const float time, const float delta )

inlinevirtual

a deriver et redefinir pour animer les objets en fonction du temps.

Reimplemented from App.

Definition at line 91 of file tuto6GL.cpp.

    {
        m_model= RotationY(time / 20);
        return 0;
    }

render()

int DrawInstanceID::render ( )

inlinevirtual

a deriver pour afficher les objets. renvoie 1 pour continuer, 0 pour fermer l'application.

Implements App.

Definition at line 98 of file tuto6GL.cpp.

    {
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
        // deplace la camera
        int mx, my;
        unsigned int mb= SDL_GetRelativeMouseState(&mx, &my);
        if(mb & SDL_BUTTON(1))              // le bouton gauche est enfonce
            m_camera.rotation(mx, my);
        else if(mb & SDL_BUTTON(3))         // le bouton droit est enfonce
            m_camera.move(mx);
        else if(mb & SDL_BUTTON(2))         // le bouton du milieu est enfonce
            m_camera.translation((float) mx / (float) window_width(), (float) my / (float) window_height());
        
        glBindVertexArray(m_vao);
        glUseProgram(m_program);
        
        Transform m= m_model;
        Transform v= m_camera.view();
        Transform p= m_camera.projection(window_width(), window_height(), 45);
        Transform mvp= p * v * m;
        Transform mv= v * m;
        
        program_uniform(m_program, "mvpMatrix", mvp);
        program_uniform(m_program, "normalMatrix", mv.normal());
        
        glDrawArraysInstanced(GL_TRIANGLES, 0, m_vertex_count, 10);
        
        return 1;
    }

Member Data Documentation

m_model

Transform DrawInstanceID::m_model

protected

Definition at line 130 of file tuto6GL.cpp.

m_camera

Orbiter DrawInstanceID::m_camera

protected

Definition at line 131 of file tuto6GL.cpp.

m_vao

GLuint DrawInstanceID::m_vao

protected

Definition at line 132 of file tuto6GL.cpp.

m_buffer

GLuint DrawInstanceID::m_buffer

protected

Definition at line 133 of file tuto6GL.cpp.

m_program

GLuint DrawInstanceID::m_program

protected

Definition at line 134 of file tuto6GL.cpp.

m_vertex_count

int DrawInstanceID::m_vertex_count

protected

Definition at line 135 of file tuto6GL.cpp.

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

• gkit2_tutos/tuto6GL.cpp