Binary platform game

No controllers were harmed in the making of this game. Just go and hone your skills on a different level. Are you quick enough to get S rank on every level? Oh, and there are jokes. Replay levels against the clock to get the fastest time you can. Control both balls at exactly the same time as you try to avoid the death and danger that awaits their every move. Laugh along with up to ten jokes!

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The player has a special ability to blast sound waves with his guitar, and he uses this ability to solve puzzles in the game. Well, quite clearly 4 is. So, what if we wanted the remainder? This can be very useful for memory allocation, or making sure you write data to proper boundaries. This is great, but if we had to work this out every time we needed to clear flags, it would become tiresome. These days however, with the power of even the most average PC, developers no longer have to know any of this. Lastly, if a byte has 8 bits. All this makes the whole collision code monumentally faster, and lets you spend the CPU time where you really need it. So if had a value of 1000111011 and I wanted to clear bits 1 and 3 using the mask above, I would end up with this. Take this statement where we want to clear bits 1 and 3 again. OR, AND, NOT and EOR let us manipulate bits with relative ease, allowing at the simplest level to control multiple bits at once.

Integer divides as shown above really help optimising your game. Well, we get this. So while there are 32 bits in an INTEGER, the bits range from 0 to 31, not 1 to 32. Well pretty not difficult it turns out. This makes life pretty simple in terms of clearing flags. How can you not difficult mark a key for a key? This is quick, very quick.

OUT of the collision! ALL that it takes to align to a 32 pixel boundary. CPUs barely crawled along at a few Mhz at a time. This is a curious one, but incredibly useful. So how do we create more complex numbers? ZX Spectrum started out with 16K and then 48K, with 128K coming in later.

Now what does this mean for in binary? Each number is created from adding multiple bits together. You can also get 128bits or more depending on CPU etc. So, only when there is a bit in each place will it be kept. How can we set both? This is incredibly useful; it means we can do simple multiplications by simply moving bits around. This is actually pretty useful, as we can now set up CONSTANTS for bit numbers. So there you go, I hope this has been useful, and gives you some insight into some valuable optimisations and data processing. So, the reason for listing all these numbers is to show the utter explosion of storage space, modern computers now have.

Fortunately there is an not difficult way of doing this by using the NOT operator. So if you can pack all yours flags down into a single memory access, this is good! Well, it merges all the bits together into a single value, like this. These sometimes have different names, but basically they equate to 8bits, 16bits, 32bits and 64bits. If we had 64 1000000, then it becomes this. OR, and this means the above instruction ORs 1 into flags If you remember from earlier, using a 1 will set the first bit. So even if bit 1 was already set, the operation still works and bit 3 will now also be set. Now, how about clearing flags? ID to the key and the door.

Studio has a platformer example that uses this method, but the key part is how we move out of a solid tile, and reposition the sprite. SIMD is based on 2 calculations at once, but doing multiple calculations in parallel. So how would we do this? So how does a computer add? What this means, is that just being able to set multiple flags at once, you can also clear multiple flags at once. TRUTH table for the OR operator. How about a larger number? So what exactly does the binary OR operator do? CPU better can also lead to writing code better, packing data better, and making some tasks just plain simple. But the rules are the same.

See the code below for the actual check. not difficult, we shift everything left by 2, rather than one. Since 16 frames is a power of 2 number, and since 0 is included in the counter, we can reduce the POW2 number by 1 and use it as a MASK, and using that we can use it to wrap our counter. So what if you wanted a key to open 2 or 3 doors? Back in the day, binary and hex were a way of life, probably because we never used high level languages such as BASIC as they were simply too slow, and that left us pretty close to the metal of the machine. But what happens if here are other bits in there? The bits we shift down are simply lost. In this example, argument0 needs to be aligned to argument1 bytes, where argument1 is a power of 2 number.

This is because 5 is 00000101 in binary, and following the rule above, flags will get both these 2 bits merged with its own. Bit 27 is an active flag, and bit 0 is an exploding flag. TRUE or FALSE value. If for example we wanted to make 6, we would add 4 and 2 together like so. This would require a left shift of 4 bits, or 7 bits respectively. This is the equivalent of dividing by 32, then multiplying by 32, thereby removing the lower bits. Well this is where the binary AND operation comes in. Now to multiply by 2 in binary, we shift all the bits to the LEFT by one.

Here are some examples. This is true of all binary numbers, and how the computer makes up any number. So why is this much worse? You use a MASK. FALSE value is ideal to store in a BIT, and if we did this we could store 32 for each INT rather than just one. ALL bits currently set, but clears the two bits we actually want cleared. But why the 31? We made some amazing games back when 48K or 64K was the norm, yet these days my PC has 8GBs of RAM!

Perhaps this remainder is used as some kind of order or something, whatever the reason, getting a remainder is as simple as doing an AND. This little script rounds UP to the next boundary of the desired number. So here we go. Compressing data structures is a good thing, because if you use less memory, you get less cache misses, and your code just runs faster. BYTE, SHORT, WORD, LONG. IF, or we can use our knowledge of binary and remove the IF completely. BITs, without having to figure out the bit value. So actually not that complex really. So how about 16, or 128? He is, at heart, an educator, and enjoys teaching and finding new ways to explain advanced concepts.

Skip Wilson video tutorials on YouTube have already helped thousands of Apple developers get started with Swift. Written for developers with previous experience in any other modern language, this book explains Swift simply and clearly, using relevant examples that solve realistic problems. Jacob is always selectively consuming the latest programming trends. His popular Skip Wilson YouTube channel has helped thousands of people around the world learn programming languages like Swift and Python. Jacob Schatz is a senior software engineer with more than eight years of experience writing code for the masses. He has a passion for making a difference and is constantly solving problems. You can save this file as player. Did you see me disappear out of the window?

Error: unhandled exception: Could not load image player. This is important for collision detection. Nim is very similar. This looks better, but would be hard to see with a brighter background. An alternative approach is to have the camera follow the player fluidly. We split the file by line as well as by word.

Windows users get them bundled. The iterations of the code of this article and the final result are available in a repository on GitHub. For our game physics we decide to have 50 ticks per second. This is similar to renderTee but uses fixed size parts of the texture. For setting up SDL2 on other platforms more extensive guides exist, as do for Nim and nimble. Okay, only memcpy is the problem.

Define a directory where we store our data assets to load them at runtime. For now the game loop just clears the window and draws it every frame. The border of the text looks rugged. Errors in the map data cause an exception to be thrown, quitting our game. Jumping is only possible when standing on the ground. Building a portable binary for Linux is a pain because of glibc.

The specific values are determined by trial and error. Note that toInput returns Input. If it is a new best time, so is his best time. At this point we have the texture and the tiles of the map. Database this might be a useful feature. Well, there goes our player. Download and save this image as grass. SDL2, SDL_image2 and SDL_ttf2 installed. Next our task is to put this together nicely.

SDL2 renderer using copyEx. Each number denotes the tile that is chosen from the grass tileset. Game object is passed around. This texture is then rendered to the screen at the defined position. Note that you also need a C compiler on your system, preferably GCC or Clang. This code is largely adapted from Teeworlds. You can also consider this as a tutorial for game development with SDL2 in Nim. Or we abuse the nimbase.

Nim programs for Windows. We can create a platformer.