QVertexArrayObject / vao GL_INVALID_OPERATION

djvi

Hi,

I am implementing a 3D software and I encounter a problem with the vao. Here is the error message I get :

QOpenGLDebugMessage("APISource", 1282, "GL_INVALID_OPERATION error generated. VAO names must be generated with glGenVertexArrays before they can be bound or used.",

I get this message when I try to set up a vao outside of initializeGL, here is the code I use :

shaderProgram->bind();
currentVbo=new QOpenGLBuffer();
currentVbo->create();
currentVbo->bind();
currentVbo->setUsagePattern(QOpenGLBuffer::DynamicDraw);
currentVbo->allocate(vertexVRAMArray , sizeof(VerticeVRAM)*nbVerticeInCurrentVbo);
currentVao=new QOpenGLVertexArrayObject();
currentVao->create();
currentVao->bind();
shaderProgram->enableAttributeArray("position");
shaderProgram->enableAttributeArray("color");
shaderProgram->enableAttributeArray("normal");
shaderProgram->setAttributeBuffer("position", GL_FLOAT, VerticeVRAM::positionOffset(), VerticeVRAM::PositionTupleSize, VerticeVRAM::stride());
shaderProgram->setAttributeBuffer("color", GL_FLOAT, VerticeVRAM::colorOffset(), VerticeVRAM::colorTupleSize, VerticeVRAM::stride());
shaderProgram->setAttributeBuffer("normal", GL_FLOAT, VerticeVRAM::normalOffset(), VerticeVRAM::normalTupleSize, VerticeVRAM::stride());
currentVao->release();
currentVbo->release();
shaderProgram->release();

If I don't use vao it work perfectly, if I set up the vao during the initialization of the openglwidget, it work perfectly but if I create the vao after initializeGL I get the error message above.

I may have misunderstood the use of vao :
Is it possible to use one vao for multiple vbo ?
What is the requirement when inistializing a vao ?

djvi

Haven't solve the problem yet anyone have an idea ?

Dariusz

Did you ever manage to solve this? I got the same issue :/

Solved, I had 2 context's somehow and that messed it all up on my end.