| Commit message (Collapse) | Author | Age | Files | Lines |
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It's a source of confusion and possibly bugs to reuse the same variable
name for multiple things.
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It's more readable than 0, and a bit safer than NULL, so let's try to
follow modern norms.
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This allows us to separate accidentally unused, from explicitly unused
parameters, which allows us to turn on such checks in the compiler.
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The generally recommended way is to include it from source files, not
headers. We had a mix of both. Let's try to be consistent and follow the
recommended way.
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Some platforms draw directly to the screen, which means that updates
will flicker if we draw multiple layers. Prevent this by first
composing the update on a hidden surface.
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This will allow us to render more things than just the framebuffer.
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