OpenGL 3.x - glBindBuffer(GL_ELEMENT_ARRAY_BUFFER) and VAOs
c++, opengl, opengl-3
Solution
`GL_ELEMENT_ARRAY_BUFFER` is tied to the VAO state. I quote the OpenGL 3.3 spec: "The resulting vertex array object is a new state vector, comprising all the state values listed in tables 6.4 and 6.5." Table 6.4 contains `ELEMENT ARRAY BUFFER BINDING`. So no, you do not need to unbind it.
Additionally, you probably want to pass `NULL` as the last parameter to `glDrawElements` in your example, since the address is relative to the bound element array buffer..
Problem
I have a method for initializing my VBO/VAO: ``` glBindBuffer(GL_ARRAY_BUFFER, mVBO_VertexShader); glBufferData(GL_ARRAY_BUFFER, sizeof(vertexPositions), vertexPositions, GL_STATIC_DRAW); glBindBuffer(GL_ARRAY_BUFFER, 0); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mIndexBuffer); glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indexData), indexData, GL_STATIC_DRAW); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0); // setup VAO glBindVertexArray(mVAO); glBindBuffer(GL_ARRAY_BUFFER, mVBO_VertexShader); glEnableVertexAttribArray(0); glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mIndexBuffer); glBindBuffer(GL_ARRAY_BUFFER, 0); glBindVertexArray(0); ``` And then a separate method for drawing; ``` glBindVertexArray(mVAO); glDrawElements(GL_TRIANGLES, 12, GL_UNSIGNED_SHORT, &mIndexBuffer); glBindVertexArray(0); ``` Do I need to unbind the `GL_ELEMENT_ARRAY_BUFFER` after my call to `glDrawElements` or is its state 'tied' to the VAO? (So if I unbind the VAO, the `GL_ELEMENT_ARRAY_BUFFER` will also be unbound)?