StorageBuffer Class Reference

Inheritance diagram for StorageBuffer:

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	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, const int samples=0)
	constructeur, dimensions de la fenetre et version d'openGL.
virtual int	update (const float time, const float delta)
	a deriver et redefinir pour animer les objets en fonction du temps.
int	run ()
	execution de l'application.

Protected Attributes
Mesh	m_mesh
Orbiter	m_camera
GLuint	m_vao
GLuint	m_buffer
GLuint	m_program
GLuint	m_texture
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 68 of file tuto_storage_buffer.cpp.

Constructor & Destructor Documentation

StorageBuffer()

StorageBuffer::StorageBuffer ( )

inline

Definition at line 72 of file tuto_storage_buffer.cpp.

: App(1024, 640,  4, 3) {}

Member Function Documentation

init()

int StorageBuffer::init ( )

inlinevirtual

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

Implements App.

Definition at line 74 of file tuto_storage_buffer.cpp.

    {
        m_mesh= read_mesh("data/cube.obj");
        
    #if 1
        // construit le storage buffer contenant les positions, les normales et les texcoords, en utilisant les types alignes
        struct vertex
        {
            glsl::vec3 position;
            glsl::vec3 normal;
            glsl::vec2 texcoord;
            
            vertex( ) : position(), normal(), texcoord() {}
        };
        
    #else
        // ou a la main
        struct vertex
        {
            vec3 position;      // vec3 aligne sur 4 float
            float pad0;
            vec3 normal;
            float pad1;
            vec2 texcoord;      // vec2 aligne sur 2 float
            
            float pad2;
            float pad3;      // donc la taille totale de la structure doit etre un mulitple de 4 floats
            
            vertex( ) : position(), normal(), texcoord() {}
        };
    #endif
        
        
        // recupere les attributs du mesh
        std::vector<vertex> data(m_mesh.vertex_count());
        for(int i= 0; i < m_mesh.vertex_count(); i++)
        {
            data[i].position= m_mesh.positions().at(i);
            data[i].normal= m_mesh.normals().at(i);
            data[i].texcoord= m_mesh.texcoords().at(i);
        }
        
        // vao par defaut
        glGenVertexArrays(1, &m_vao);
        glBindVertexArray(m_vao);
        
        // storage buffer
        glGenBuffers(1, &m_buffer);
        
        glBindBuffer(GL_SHADER_STORAGE_BUFFER, m_buffer);
        glBufferData(GL_SHADER_STORAGE_BUFFER, sizeof(vertex) * data.size(), data.data(), GL_STREAM_READ);
        
        // 
        m_program= read_program("gkit2_tutos/tuto_storage_buffer.glsl");
        program_print_errors(m_program);
        
        //
        Point pmin, pmax;
        m_mesh.bounds(pmin, pmax);
        m_camera.lookat(pmin, pmax);
 
        m_texture= read_texture(0, "data/debug2x2red.png");
        
        // 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 StorageBuffer::quit ( )

inlinevirtual

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

Implements App.

Definition at line 148 of file tuto_storage_buffer.cpp.

    {
        m_mesh.release();
        release_program(m_program);
        glDeleteTextures(1, &m_texture);
        glDeleteBuffers(1, &m_buffer);
        glDeleteVertexArrays(1, &m_vao);
        return 0;
    }

render()

int StorageBuffer::render ( )

inlinevirtual

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

Implements App.

Definition at line 159 of file tuto_storage_buffer.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 model= RotationY(global_time() / 20);
        Transform view= m_camera.view();
        Transform projection= m_camera.projection(window_width(), window_height(), 45);
        Transform mv= view * model;
        Transform mvp= projection * mv;
        
        program_uniform(m_program, "mvMatrix", mv);
        program_uniform(m_program, "normalMatrix", mv.normal());
        program_uniform(m_program, "mvpMatrix", mvp);
        
        program_use_texture(m_program, "diffuse_color", 0, m_texture, 0);
        
        // selectionne le buffer comme storage buffer, numero 0
        glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 0, m_buffer);
        
        glDrawArrays(GL_TRIANGLES, 0, m_mesh.vertex_count());
        
        return 1;
    }

Member Data Documentation

m_mesh

Mesh StorageBuffer::m_mesh

protected

Definition at line 197 of file tuto_storage_buffer.cpp.

m_camera

Orbiter StorageBuffer::m_camera

protected

Definition at line 198 of file tuto_storage_buffer.cpp.

m_vao

GLuint StorageBuffer::m_vao

protected

Definition at line 200 of file tuto_storage_buffer.cpp.

m_buffer

GLuint StorageBuffer::m_buffer

protected

Definition at line 201 of file tuto_storage_buffer.cpp.

m_program

GLuint StorageBuffer::m_program

protected

Definition at line 202 of file tuto_storage_buffer.cpp.

m_texture

GLuint StorageBuffer::m_texture

protected

Definition at line 203 of file tuto_storage_buffer.cpp.

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

• gkit2_tutos/tuto_storage_buffer.cpp