A segmentation error when I get size of the std::vector

[8Observer8]

Hello!

I have a segmentation error on the this string: size_t size = meshes.size();

void meshLoader::draw(unsigned int programId)
{
    size_t size = meshes.size();
 
    for( unsigned int i = 0;i < meshes.size(); ++i )
        meshes[i].draw( programId );
}

void meshLoader::draw(unsigned int programId)
{
    size_t size = meshes.size();

    for( unsigned int i = 0;i < meshes.size(); ++i )
        meshes[i].draw( programId );
}

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Please, run my application if you use Assimp. Or just see code

[anda_skoa]

That usually means that "this" is not a valid instance.

Check the creation of the meshLoader instance and if you call its method and not on some invalid pointer

Cheers,
_

[8Observer8]

I don't understand why it occur. I have a global variable "globalGLFunctions":

#include <QOpenGLFunctions_2_1>
 
// ...
 
QOpenGLFunctions_2_1 *globalGLFunctions;
 
// ...
 
Scene::Scene( QWidget *parent ) :
    QGLWidget( parent )
{
    makeCurrent();
    globalGLFunctions = new QOpenGLFunctions_2_1;
    globalGLFunctions->initializeOpenGLFunctions();
}
 
void mesh::draw(unsigned int programId)
{
    //attribute vec3 vertex
    int vertex = globalGLFunctions->glGetAttribLocation(programId,"vertex"); //0
    int normal = globalGLFunctions->glGetAttribLocation(programId,"normal"); //1
    int tangent = globalGLFunctions->glGetAttribLocation(programId,"tangent"); //2
    int color = globalGLFunctions->glGetAttribLocation(programId,"color"); //3
    int UV = globalGLFunctions->glGetAttribLocation(programId,"UV"); //4
 
    //texture0
    //texture1...
    std::string str="texture";
    for( size_t i=0;i<textures.size();i++)
    {
        globalGLFunctions->glActiveTexture(GL_TEXTURE0+i);
        globalGLFunctions->glBindTexture(GL_TEXTURE_2D,textures[i].id);
        globalGLFunctions->glUniform1i(globalGLFunctions->glGetUniformLocation(programId,(str+(char)(i+'0')).c_str()),i);
    }
 
    globalGLFunctions->glBindBuffer(GL_ARRAY_BUFFER,VBO);
    globalGLFunctions->glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,IND);
 
    globalGLFunctions->glEnableVertexAttribArray(vertex);
    globalGLFunctions->glVertexAttribPointer(vertex,3,GL_FLOAT,GL_FALSE,sizeof(vertexData),0);
 
    globalGLFunctions->glEnableVertexAttribArray(normal);
    globalGLFunctions->glVertexAttribPointer(normal,3,GL_FLOAT,GL_FALSE,sizeof(vertexData),(void*)(3*sizeof(float)));
 
    globalGLFunctions->glEnableVertexAttribArray(tangent);
    globalGLFunctions->glVertexAttribPointer(tangent,3,GL_FLOAT,GL_FALSE,sizeof(vertexData),(void*)(6*sizeof(float)));
 
    globalGLFunctions->glEnableVertexAttribArray(color);
    globalGLFunctions->glVertexAttribPointer(color,3,GL_FLOAT,GL_FALSE,sizeof(vertexData),(void*)(9*sizeof(float)));
 
    globalGLFunctions->glEnableVertexAttribArray(UV);
    globalGLFunctions->glVertexAttribPointer(UV,2,GL_FLOAT,GL_FALSE,sizeof(vertexData),(void*)(12*sizeof(float)));
 
    globalGLFunctions->glDrawElements(GL_TRIANGLES,indices.size(),GL_UNSIGNED_INT,0);
 
    globalGLFunctions->glDisableVertexAttribArray(vertex);
    globalGLFunctions->glDisableVertexAttribArray(normal);
    globalGLFunctions->glDisableVertexAttribArray(tangent);
    globalGLFunctions->glDisableVertexAttribArray(color);
    globalGLFunctions->glDisableVertexAttribArray(UV);
    globalGLFunctions->glBindBuffer(GL_ARRAY_BUFFER,0);
    globalGLFunctions->glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,0);
}

#include <QOpenGLFunctions_2_1>

// ...

QOpenGLFunctions_2_1 *globalGLFunctions;

// ...

Scene::Scene( QWidget *parent ) :
    QGLWidget( parent )
{
    makeCurrent();
    globalGLFunctions = new QOpenGLFunctions_2_1;
    globalGLFunctions->initializeOpenGLFunctions();
}

void mesh::draw(unsigned int programId)
{
    //attribute vec3 vertex
    int vertex = globalGLFunctions->glGetAttribLocation(programId,"vertex"); //0
    int normal = globalGLFunctions->glGetAttribLocation(programId,"normal"); //1
    int tangent = globalGLFunctions->glGetAttribLocation(programId,"tangent"); //2
    int color = globalGLFunctions->glGetAttribLocation(programId,"color"); //3
    int UV = globalGLFunctions->glGetAttribLocation(programId,"UV"); //4

    //texture0
    //texture1...
    std::string str="texture";
    for( size_t i=0;i<textures.size();i++)
    {
        globalGLFunctions->glActiveTexture(GL_TEXTURE0+i);
        globalGLFunctions->glBindTexture(GL_TEXTURE_2D,textures[i].id);
        globalGLFunctions->glUniform1i(globalGLFunctions->glGetUniformLocation(programId,(str+(char)(i+'0')).c_str()),i);
    }

    globalGLFunctions->glBindBuffer(GL_ARRAY_BUFFER,VBO);
    globalGLFunctions->glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,IND);

    globalGLFunctions->glEnableVertexAttribArray(vertex);
    globalGLFunctions->glVertexAttribPointer(vertex,3,GL_FLOAT,GL_FALSE,sizeof(vertexData),0);

    globalGLFunctions->glEnableVertexAttribArray(normal);
    globalGLFunctions->glVertexAttribPointer(normal,3,GL_FLOAT,GL_FALSE,sizeof(vertexData),(void*)(3*sizeof(float)));

    globalGLFunctions->glEnableVertexAttribArray(tangent);
    globalGLFunctions->glVertexAttribPointer(tangent,3,GL_FLOAT,GL_FALSE,sizeof(vertexData),(void*)(6*sizeof(float)));

    globalGLFunctions->glEnableVertexAttribArray(color);
    globalGLFunctions->glVertexAttribPointer(color,3,GL_FLOAT,GL_FALSE,sizeof(vertexData),(void*)(9*sizeof(float)));

    globalGLFunctions->glEnableVertexAttribArray(UV);
    globalGLFunctions->glVertexAttribPointer(UV,2,GL_FLOAT,GL_FALSE,sizeof(vertexData),(void*)(12*sizeof(float)));

    globalGLFunctions->glDrawElements(GL_TRIANGLES,indices.size(),GL_UNSIGNED_INT,0);

    globalGLFunctions->glDisableVertexAttribArray(vertex);
    globalGLFunctions->glDisableVertexAttribArray(normal);
    globalGLFunctions->glDisableVertexAttribArray(tangent);
    globalGLFunctions->glDisableVertexAttribArray(color);
    globalGLFunctions->glDisableVertexAttribArray(UV);
    globalGLFunctions->glBindBuffer(GL_ARRAY_BUFFER,0);
    globalGLFunctions->glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,0);
}

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