void MeshCommand::buildVAO()
{
// FIXME: Assumes that all the passes in the Material share the same Vertex Attribs
GLProgramState* programState = (_material != nullptr)
? _material->_currentTechnique->_passes.at(0)->getGLProgramState()
: _glProgramState;
releaseVAO();
glGenVertexArrays(1, &_vao);
GL::bindVAO(_vao);
glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer);
auto flags = programState->getVertexAttribsFlags();
for (int i = 0; flags > 0; i++) {
int flag = 1 << i;
if (flag & flags)
glEnableVertexAttribArray(i);
flags &= ~flag;
}
programState->applyAttributes(false);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBuffer);
GL::bindVAO(0);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
}
void MeshCommand::preBatchDraw()
{
// Do nothing if using material since each pass needs to bind its own VAO
if (!_material)
{
if (Configuration::getInstance()->supportsShareableVAO() && _vao == 0)
buildVAO();
if (_vao)
{
GL::bindVAO(_vao);
}
else
{
glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer);
// FIXME: Assumes that all the passes in the Material share the same Vertex Attribs
GLProgramState* programState = _material
? _material->_currentTechnique->_passes.at(0)->getGLProgramState()
: _glProgramState;
programState->applyAttributes();
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBuffer);
}
}
}