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Parallax Scrolling IV - Overdraw Elimination +
----------------------------------------------
This is the fourth of the SDL scrolling
examples, and uses an improved version
of the recursive overdraw eliminating
algorithm from Parallax Scrolling III.
Just as Parallax Scrolling III, this version
renders the screen from front to back, adjusting
the target surface clip rectangle to keep the
"underlying" graphics from covering the areas
already rendered.
The difference is that instead of working with
one tile at a time (which results in lots of
recursions and clipping overhead), this version
looks ahead, and processes runs of similar tiles
in "batches". Only one recursive call per run is
required, as opposed to one per tile.
Just as before, there are three classes of tiles;
1. Fully opaque.
Very simple: The tile is drawn as defined
in the map data, and no further action is
taken. This case terminates recursion.
2. Fully transparent.
Recursion is done in order to render the
next layer. No further action is taken.
3. Partially transparent.
Recursion to the next layer is done as for
case 2. Then the color keyed or blended
tile is rendered on top of the result,
after the recursive call chain returns.
The "run detector" treats 2 and 3 the same, so
there are effectively only two kinds of runs;
opaque runs (that terminate recursion), and
partially transparent runs (containing both empty
and partially transparent tiles), which requires
a recursive call to the underlying layer(s)
before being rendered.
This version scales *much* better than Parallax
Scrolling III, but honestly, it still sucks.
Some day, I'm probably going to go all the way,
and create a heavily optimized version, with all
the hairiness you could expect from such a beast.
Or why not try to beat me to it? ;-)
The program supports a few command line options:
-f Fullscreen
-d Double buffer
-<n> Depth = <n> bits
-l<n> Use <n> layers (default = 7)
-b "Bounce-around" mode
-w Wrap maps instead of bouncing
-a<n> Alpha for non-opaque tiles = <n>
-v<n> Verbosity level <n> (default = 0)
-np Don't use planet layers
-nr Don't use the "run detector".
(This makes the algorithm work
like the previous version; one
tile at a time.)
//David Olofson <david@olofson.net>
//Ventzislav Tzvetkov http://drhirudo.hit.bg
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Contents of demo/intro/parallax4.lha
PERMSSN UID GID PACKED SIZE RATIO CRC STAMP NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic] 170611 598479 28.5% -lh5- 7bd5 Sep 4 21:17 parallax-4/parallax4
[generic] 4947 15120 32.7% -lh5- 4fbf Jan 18 2002 parallax-4/parallax4.c
[generic] 967 2247 43.0% -lh5- 865a Jan 18 2002 parallax-4/parallax4.h
[generic] 1832 2104 87.1% -lh5- 30ee Sep 6 16:41 parallax-4/parallax4.info
[generic] 1238 2499 49.5% -lh5- 779e Sep 4 21:25 parallax-4/parallax4.readme
[generic] 1826 2104 86.8% -lh5- f3df Sep 6 16:41 parallax-4/parallax4.readme.info
[generic] 1136 2309 49.2% -lh5- 05f2 Jan 18 2002 parallax-4/README
[generic] 3032 7831 38.7% -lh5- 15e0 Aug 1 2001 parallax-4/INSTALL
[generic] 2233 5598 39.9% -lh5- a21f Aug 1 2001 parallax-4/install-sh
[generic] 245 387 63.3% -lh5- 1463 Sep 4 21:18 parallax-4/make.amiga
[generic] 3604 10899 33.1% -lh5- b504 Aug 30 17:43 parallax-4/Makefile
[generic] 55 58 94.8% -lh5- 7f76 Jan 18 2002 parallax-4/Makefile.am
[generic] 3590 11029 32.6% -lh5- af20 Jan 18 2002 parallax-4/Makefile.in
[generic] 380 722 52.6% -lh5- c7b6 Aug 1 2001 parallax-4/mkinstalldirs
[generic] 6197 34614 17.9% -lh5- 35ab Jan 18 2002 parallax-4/tiles.bmp
[generic] 1274 2607 48.9% -lh5- bae4 Jan 18 2002 parallax-4/ChangeLog
[generic] 1808 5503 32.9% -lh5- 66e5 Aug 30 17:43 parallax-4/config.log
[generic] 5778 15886 36.4% -lh5- 4250 Aug 30 17:43 parallax-4/config.status
[generic] 28347 100820 28.1% -lh5- 31f5 Jan 18 2002 parallax-4/configure
[generic] 297 455 65.3% -lh5- 3aa2 Jan 18 2002 parallax-4/configure.in
[generic] 6992 17983 38.9% -lh5- 8f29 Aug 13 1998 parallax-4/COPYING
[generic] 4057 12117 33.5% -lh5- 10d9 Jan 18 2002 parallax-4/depcomp
[generic] 2135 6283 34.0% -lh5- b90d Aug 1 2001 parallax-4/missing
[generic] 1302 1655 78.7% -lh5- 0adc Sep 6 16:04 parallax-4.info
[generic] 788 4483 17.6% -lh5- f4e2 Aug 30 17:43 parallax-4/.deps/parallax4.Po
[generic] 8448 22752 37.1% -lh5- 42d0 Jan 18 2002 parallax-4/aclocal.m4
[generic] 100 132 75.8% -lh5- e835 Aug 1 2001 parallax-4/AUTHORS
---------- ----------- ------- ------- ------ ---------- ------------ -------------
Total 27 files 263219 886676 29.7% Sep 6 19:04
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