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Attention | Topic was automatically imported from the old Question2Answer platform. |
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Asked By | lukas |
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Old Version | Published before Godot 3 was released. |
I am curious how much processing power consume back-buffer copy of screen. I am considering Gaussian blur. There are two approaches:
- One pass filter: For each pixel make a weighted average (2D gaussian kernel) of n x n pixels surrounding the pixel. It costs O(n^2).
- Two passes filter: For each pixel make a horizontal weighted average (1D gaussian kernel) of 1 x n pixels. Then read the screen again (using back-buffer copy nodes) and make a vertical weighted average (1D gaussian kernel) of n x 1 pixels. It costs O(n). But I am not sure how efficient is to make back-buffer copy.
What approach is more efficient in Godot?