Opengl es 2.0 disable vertexarray8/10/2023 ![]() ![]() M_tUsagePattern( QOpenGLBuffer::StaticDraw ) M_tAttributeBuffer( 'vertexPosition', GL_FLOAT, 0, 3 ) M_shaderProgram.enableAttributeArray( 'vertexPosition' ) M_tUsagePattern( QOpenGLBuffer::StreamDraw ) Setup VBOs and IBO (use QOpenGLBuffer to buffer data, M_vao1 = new QOpenGLVertexArrayObject( this ) m_shaderProgram is a QOpenGLShaderProgram Assumes we have a current QOpenGLContext and that ![]() This allows us to very rapidly switch between vertex states for “objects” that we wish to draw in our rendering function: void Scene::initialize() We can later restore this vertex specification state very quickly by simply re-binding the VAO itself. ![]() Binding an instance of this class causes OpenGL to “remember” any vertex specification state that you then set up. KDAB has added code to Qt 5.1 that encapsulates VAOs with the QOpenGLVertexArrayObject class. OpenGL also has a simple related container type call Vertex Array Objects (VAOs) to help with managing sets of vertex buffer objects. Qt has QOpenGLBuffer (and before that QGLBuffer) to help manage various types of OpenGL buffer objects such as per-vertex attribute data and element index buffers. This article continues our series on what is new in Qt 5.1 with respect to OpenGL. ![]()
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