glDeleteBuffers slower than glBufferData

Question

I\'m having a bit of performance issue in my iOS/Android game where several VBO\'s have to be updated every once in a while. After profiling my game it turns out that glDele

Answer 1

glGenBuffers and glDeleteBuffers are designed to only be run on initialization and cleanup, respectively. Calling them during runtime is bad.

glBufferData replaces the current buffer data with a new set of data, which automatically changes the size of the buffer. You can safely remove the whole glGenBuffers/glDeleteBuffers thing and move it into initialization and cleanup.

Additionally, you are creating the buffer as a static buffer. This is telling OpenGL that you will almost never change it so it stores it in a way that's quicker to access on the GPU but slower to access from the rest of the system. Try changing GL_STATIC_DRAW to GL_DYNAMIC_DRAW or GL_STREAM_DRAW. More on this here: http://www.opengl.org/wiki/Buffer_Objects#Buffer_Object_Usage