When point sample rendering (also known as multisample rendering) has been enabled via set_samples_per_pixel then you can optionally call this function (or resolve_samples) to explicitly resolve the point samples into values for the final color buffer.
Some GPUs will implicitly resolve the point samples during rendering and so this function is effectively a nop, but with other architectures it is desirable to defer the resolve step until the end of the frame.
Use of this API is recommended if incremental, small updates to a framebuffer are being made because by default Cogl will implicitly resolve all the point samples of the framebuffer which can result in redundant work if only a small number of samples have changed.
Because some GPUs implicitly resolve point samples this function only guarantees that at-least the region specified will be resolved and if you have rendered to a larger region then it's possible that other samples may be implicitly resolved.
| this |
A Framebuffer framebuffer |
| x |
top-left x coordinate of region to resolve |
| y |
top-left y coordinate of region to resolve |
| width |
width of region to resolve |
| height |
height of region to resolve |