activateRenderProgram method
Implementation
void activateRenderProgram(RenderProgram renderProgram) {
if (!identical(renderProgram, _activeRenderProgram)) {
_activeRenderProgram.flush();
_activeRenderProgram = renderProgram;
_activeRenderProgram.activate(this);
_activeRenderProgram.projectionMatrix = _projectionMatrix;
}
}