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ca80e8802b
First, let's add a new public feature called, surprisingly, COGL_FEATURE_PBOS to check the availability of PBOs and provide a fallback path when running on older GL implementations or on OpenGL ES In case the underlying OpenGL implementation does not provide PBOs, we need a fallback path (a malloc'ed buffer). The CoglPixelBufer constructors will instanciate a subclass of CoglBuffer that handles map/unmap and set_data() with a malloc'ed buffer. The public feature is useful to check before using set_data() on a buffer as it will mean doing a memcpy() when not supporting PBOs (in that case, it's better to create the texture directly instead of using a CoglBuffer).