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      Retro Development

      We Got Dungeons - A Tactical RPG for the Sega Genesis! Dev Log 1

      We Got Dungeons - A Tactical RPG for the Sega Genesis! Dev Log 1

      We got a danger. We got to battle. We got tactics. We got a choice. We got a story. We Got Dungeons.

      Imagine that Neil Gaiman wrote a novel about Buffy the Vampire Slayer investigating some weirdness in Earthbound. Now imagine that this novel was actually a tactical RPG with some rogue-like elements and a unique progression and customization system. Now imagine that this RPG came out for the Sega Genesis in the 90s.

      Still with me? Good…

      Features

      We Got Dungeons is a tactical RPG with:

      • Procedurally generated dungeons - every dungeon and every room have different layouts for enemies, traps, hazards, and treasure. No playthrough is the same!
      • Multiple storylines. Pick your lead character and experience 9 different tales about coming to terms with yourself and your world.
      • 90s theme - take on the other side with retro video games, Pogs, and VHS tapes in the mall, in the park, and beyond
      • Tactical combat - choose your party and engage with evil troll dolls and possessed grunge kids. Use strategic positioning and mastery of skills to pull through challenging encounters and battles.
      • Unique customization - The Skill Board system gives you complete control over your characters. Equip any ability, any perk, any stat increase you want -- if you got the room for it, you can use it.

      Story

      In a 90s suburbia, not everything is as fly as it seems. Beneath the veneer of normalcy lies cynicism, doubt, and dissatisfaction with life. People want something, they just don't know what that is. But forces from the beyond think they have the answer, and things get weird when they begin to enter our world through the mundane. Weird like your neighbor’s basement going down ten floors. Weird like movie rental stores that are bigger on the inside than on the outside. Weird like your favorite VHS tape trying to choke you to death.

      These forces are launching unannounced, unplanned, uninvited visits to our reality. It’s an unbidden invasion of suburbia, an unsought for contact from beyond the screen that separates us from them… and it all starts in your town…

      Characters

      So who is gonna step up to stop this invasion? Who can we depend on to turn the tide of this sinister threat? The military? Superheroes? 90s cartoon characters?

      Actually, the world’s last hope is your mother.

      Eschewing the traditional RPG/tactical RPG heroes of knights, wizards, and rogues, We Got Dungeons features ordinary people in a situation that is definitely buggin’. Luckily, the weirdness that is creeping in from the other side is amping up some of their everyday abilities. Let’s meet a couple of our unsung heroes:

      The Troublemaker

      She’s a high-school delinquent that cuts class, smokes, and runs afoul of the local neighborhood watch. Whether it’s flaunting the town’s “No Skateboarding” laws or tagging the convenience store with graffiti, you know the troublemaker is to blame.

      Her skateboard and spraypaint come in handy as useful weapons, and she has a variety of skills (like bullying and shoplifting) that make her a versatile character.

      Your Mother

      Dear old mom. Everyone has one. Always there for you, she’ll love you forever, no matter what you do. But don’t let all those bedtime stories, embarrassing baby pictures, and boo-boo kisses fool you; when push comes to shove, mom is who you want on your side to fend off the forces from beyond.

      Mom can make you feel better, easing all your troubles and woes with a hug. Or she can totally mess up your social life by grounding you. Either way, the weirdness invading our reality is sure to find out that there is no such thing as “just” a mother.

      We Got More...

      Want more dungeons? Keep reading our series of dev logs here. More classes, tons of weapons, armies of 90s enemies -- we are pushing the Sega Genesis to its limits for this one. Next time we’ll introduce some abilities that put the "Tactic" in "Tactical RPG", and a dungeon boss you may recognize from a famous basement…





      Creating NES Graphics

      Creating NES Graphics

      Resolution

      The NES brought a new era of bringing arcade action into the living room. 22 years later, it still holds a special place in the heart of millions who are swept by nostalgia when they see the iconic shape of the game cartridges and easy-to-identify aesthetic. Technical limitations are what make or break games for the NES, providing unique challenges for developers and designers alike. As we examine the best way to create graphics for the NES, we’ll be looking at screenshots from Almost Hero to give you an example of what we’re referencing. Alright, let’s dig in and talk graphics!

      NES’ Native Resolution

      The NES native resolution is 256x240 px. In a world where contemporary consoles can run 1,920x1,080 px, it's hard to imagine that pushing the technical limitations. Emulators for the NES are most commonly configured to a default 256x224, so there isn’t a world of difference between designing graphics for NES consoles and designing for emulators. Not only are the pixels the same, but you’ll find similar restrictions when selecting your color palette.

      Basic Palette Restrictions

      Above is the full NES palette in all of its semi-colorful glory. The section with red lines through it is comprised of different shades of black, but practically speaking, all games use the same black value (the top right corner of the palette marked as 0F). If you have an eye for color, you probably noticed that you’re not going to find a lot of warmer shades in this palette. NES designers tend to rely more on cool tones, which is why you’ll notice more greens and blues in NES titles. Regardless of your artistic preferences, the artwork that you make for the NES needs to pull its colors from this palette, as it’s hard-coded into the console.

      Try to remember the first picture from this article, because I’ll be referencing it as we go on. The above image is from the palette that was used for that screenshot of Almost Hero, and it can tell us a lot about how the NES likes its colors. The NES loads palettes on a per-screen basis and, in order for these colors to change, we would have to move to a new area and give the NES’ graphics processor time to refresh and load new palettes. Understanding the way the NES uses palettes will make your job way easier. There are always eight palettes loaded at all times; there are four palettes for backgrounds and four palettes for sprites. Each palette is made up of four colors, and the first color of each palette is going to be a common transparent or background color. In the case of background palettes, that first color is just a color that all four palettes have in common. Generally, you use either black or the dominant color in your background image. For sprites, the transparent color actually does act as transparency, since anything drawn with that color will not be rendered in the game. In the above example, the top four palettes are the background palettes, and the bottom four are for sprites. Just because you’ve got the color right, though, doesn’t mean the rest of the process will be smooth sailing.

      Basic Sprite Restrictions

      If you look at the above screenshot, you can see that some of the main character’s sprite is missing. It’s a pretty common problem with NES titles due to basic system limitations. Once there is so much data on the screen, the sprites begin to flicker quickly. That flickering is added in by the person programming the game in order to combat the tight restrictions that the NES puts on sprites. You can have 64 sprites (in this case a sprite is an 8x8 tile, so the full character artwork is made up of multiple sprites) on screen at once. That limitation itself isn’t too bad, and you’re probably imagining how much you could do with 64 sprites. The much harsher limitation is that you can only have 8 sprites per scan line (basically a 1px horizontal line across the screen) before it stops rendering any new sprites on that same line. That’s where your flickering sprites come in. When they flicker, you’re rendering fewer sprites every frame, which allows for more sprites to be on screen. Palettes for sprites are loaded individually for each 8x8 sprite tile, which sounds like a dream come true compared to how it is handled with backgrounds.

      Tiles

      What you are looking at is all the graphics data that are loaded up on the NES from the previous Almost Hero screenshots. The left side contains all the background graphics, and the sprites are on the right. Each of the graphics in the game is stored as 8x8px tiles, and those tiles are then pieced together to bring together the characters and background elements within the game. Most retro consoles store their graphics this way, and it isn’t just to annoy you–it also helps you make the most of your limited amount of storage space. It only needs to load unique tiles, so anything that gets reused doesn’t need to be drawn more than once.

      Setting Up a Work Environment

      Now that you know a bit about how the NES likes to setup its palettes and graphics, it’s probably a good time to discuss the tools you’ll want to use when making your 8-bit artwork. I generally use three different tools when I work on pixel art, since some are better for doing certain things than others, and vice versa. For this post, I’m going to cover the basics of each tool, and then we’ll get into more detail about their features as we go along. The three tools that I like to use are YY-CHR, Gimp (Photoshop is also acceptable, but you might use a more complicated process to achieve the same result), and Aseprite.

      YY-CHR

      YY-CHR is a free utility that is made specifically for working with retro artwork. I only use it for the NES though, since many of its features were created solely with the NES in mind. In the above image, I actually have a rom of Almost Hero loaded into it. The window on the left is a page of graphics data that is stored on the rom. It’s worth noting that you can’t directly edit in this window, with the exception of basic functions like copy, paste, delete, and mirror. If you right-click and drag in this window, you can select multiple tiles in order to apply those functions to them. The window on the right is where you can edit tiles directly, and it can only properly display one palette at a time and export everything as a single palette.

      While it’s pretty stripped-down in terms of features, it keeps you working within the constraints of the NES. Everything is done on an 8x8 grid (even the zoom levels are in multiples of 8), and forcing you to work on one palette at a time makes sure that there isn’t any overlap in the overall image. I generally use this for making sprites and organizing all of the graphics data to be placed in a game, but we all know there’s a lot more to designing 8-bit art than that, which is exactly why I rely on Gimp for things that YY-CHR simply can’t do.

      Gimp

      Gimp is pretty similar to Photoshop, only it has the added benefit of not costing me anything. I turn to Gimp when I need to make backgrounds, now that I’m more used to working within the attribute table limitations and tile limits. If you want to use Gimp or a similar photo-editing program, there are a few things that you need to keep in mind when you are setting up your environment.

      First off, the NES can only load 256 unique background tiles at a time. That means that your background needs to fit that constraint. I will cover a tool that can create tilesets, and give you a tile count automatically a little later, but just try to keep the concept in mind. Also, don’t forget that your text and heads up display are generally loaded as part of the background, so you’re going to need to save space for them.

      The next thing that you need to keep in mind is the attribute table limit (background palettes are loaded in a 16x16 grid). In order to keep up with that limitation, I usually set up a 16x16 grid on top of my image. In Gimp, you’d click on View>Show Grid then, once the grid is displayed, go to Image > Configure Grid and set the dimension to 16x16. Other than that, I usually set my canvas to the native resolution of the NES (256x240) and I’m good to go.

      When you’re using tools like Gimp and Photoshop, you don’t want to have any kind of automatic anti-aliasing. Because you are so restricted in terms of color, you have to do all anti-aliasing by hand. That means you should only ever really use the pencil tool when you’re working freehand (pro tip: If you hold down shift in Gimp after placing a pixel with the pencil tool, it will allow you to draw a straight line. The line will adhere to grid snapping as well). If you find yourself wanting to resize or rotate part of your image, you need to make sure to set Interpolation to None (or Nearest Neighbor in Photoshop). Generally speaking though, when you use tools like that, you’re going to have to touch the result up due to a loss of detail, so keep that in mind before you dive in.

      Another feature that makes me use Gimp for designing backgrounds is that your clipboard is automatically loaded as a pattern. If you intend to use a lot of repeating tiles (which is generally mandatory on the NES), you can just copy the 16x16 section that you’re planning on repeating, select the area that you want to fill, and then use a pattern fill to save yourself some time. Of course, you may be designing for another retro console, and there are options out there for you, too.

      Aseprite

      I don’t generally use Aseprite for NES graphics due to their simplicity, but I do like to use it for other consoles. If you’re not planning on designing for the NES, then Asperite may have the right features for you. Aseprite is a paid program that has been designed for making general pixel art. It allows you to easily create and edit a color index (the palette on the left) and has built-in presets for a variety of retro consoles. It will also let you select more than one color at a time in order to automatically create gradients, and will even attempt to do programmatic anti-aliasing while adhering to your limitations (generally you still need to do some by hand cleanup, though). It also has some nice tools for creating animations, which is a huge plus. It features smoother rotation algorithms than Gimp or Photoshop and supports adding animation frames and layers. You get to keep a simple toolset (only slightly more advanced than YY-CHR), but you’re still carrying the useful features of more powerful image editing programs.

      Breakdown of Elements

      As you could see in our loaded tiles, backgrounds and sprites are loaded separately, largely because there are some pretty fundamental differences in how the two of them work. We’ve already covered how sprites work, but a quick refresher can’t hurt. Sprites are pieced together in 8x8 tiles, and each tile can have one of the four sprite palettes assigned to it. Also, it’s important to remember that there’s an 8 sprite-per-scanline limit. That limit is crucial because you always want to be aware of how much more data can fit on your screen. If your character has a rapid-fire machine gun, that’s going to put a lot of sprites on a single scanline. In the case of Almost Hero, the sprites are relatively wide (three sprites in width), so that would put us over the limit any time there were two enemies and a weapon on the same line. In the case of Almost Hero, it was minor enough that sprite-flickering was enough to solve it, but this can be a serious issue when you use larger sprites.

      Now that we’ve talked about sprites and color palettes, I’d like to focus on designing a background within limitations. Backgrounds are handled a little differently, so be ready to interact with some new ideas. While backgrounds are still loaded as 8x8 tiles and pieced together into a larger image, palettes are assigned in 16x16 attribute tables. That means that if you were to break your background into a 16x16 grid, each cell of that grid would have to share the same four color palettes. Here is what that would look like:

      I removed all the character elements in order to make the background a little easier to see. Side note: Notice that the item in your reserve slot was also a sprite. Using sprites in a generally static area like a heads-up display is a nice way of adding a little extra color to things, or adding in more dynamic elements. As you’re designing your backgrounds, though, It’s important to keep the attribute table limitations in mind not only because it is a very hard limitation on how graphics will be loaded, but also because you want to use color choices that mask that limitation a little bit. In the above image, the street uses a different palette than the yellow/brown highlights, and that isn’t an accident. I made them share their brightest color in order to make them mesh together a little better so I could mask the fact that it’s all put together on a grid. Adhering to the rules of attribute tables is really one of the biggest hurdles separating 8-bit style pixel art from true 8-bit art, so it’s something you’ll want to keep in mind as we continue.

      As important as it is, working within the attribute table and tile limits can often be a huge pain. You are pretty much forced into using the same tiles repeatedly if you want to make the image larger and more coherent, but that will leave you with a painfully bland background.

      The above example relies entirely on using repeating tiles to make the image. As you can see, it looks nice enough and makes is obviously a street, but it’s just plain boring. At the same time though, you’ll see that most of the completed image still uses a lot of repeating tiles to achieve the overall image. Repeating tiles are great if you’re looking to make your job easier, but you will still need to add in small details to really make the background your own.

      For Almost Hero, I added a logo to the wall, some small imperfections on the pipe, crates in the background, and small cracks in the concrete and walls in order give the background some grit. In the ideal situation, you can come up with small elements like those that not only give your background depth but are reusable. The chipping on the wall and the grates on the street above are good examples of that–they both individualize the background and can be reused later if I need them. Another good way to save space is to make elements in your stage that can have more than one purpose. You could use the top of a column as a platform later on, which would keep the game from needing to load two separate graphics for similarly-shaped objects.

      More than just minor details, keep an eye on the big picture. You’ll want to mind things like shadow and highlight while you are designing your backgrounds. They are important concepts to use, especially when you’re working with a limited color palette. If you can use highlights to bring out the shape of your element, then sometimes it’s better to rely on negative space and use highlights to add detail and shape. In our example, I used a higher contrast palette to make certain elements stand out more than others, which created something more visually interesting. The yellow/brown palette I used has more contrast than the street, which keeps the player’s eyes focused on the middle of the screen rather than drifting aimlessly around the shot.

      One final trick that you’ll probably want to use is some basic anti-aliasing. Seeing how you only have three colors and a transparent shade, jagged edges are all but inevitable. You can combat those a little bit by adding some pixels to the edge of your image to soften the overall look. If you have a light object on a dark background, take one of your darker colors and draw a single pixel on the corners of where the dark background and light object meet–you’ll immediately notice how much smoother the edges look.

      You can also experiment with using different shades and different amounts of anti-aliasing until you get a result that you like. Here you can an edge without any anti-aliasing applied on the left, where the next one overuses one shade lighter to smooth the edges, then one that uses the darkest shade, and finally one that uses both. It’s a good idea to use something like this to control the softness of the object that you’re drawing and prevent any harsh lines where you don’t want them.

      To wrap it all up, we’ve talked about the various limitations that you’ll have to deal with when you work on the NES, some tools that you can use to work on your art, and the things you’ll have to think about when you’re making a background for an 8-bit game. If you can adhere to these limitations, then drawing background art boils back down to the basic principles of making art in general. You just need to identify what shapes your objects are made of and then turn those shapes into the elements that you want to draw. Now that we have a solid foundation of NES graphics, the next post is going to talk about how you can make your first character sprite on the NES.

      Bonus - Automatic Tile Counts and Tilesheets

      I used to get this question a lot from people that I work with, so I did a little research and found a pretty quick solution. You are limited to 256 unique tiles when you are making a background for a game, so is there an easy way to get a tile count?

      Thankfully, there’s a pretty easy solution to this question. I found out about a program called Pyxel Edit that handles not only that, but it also generates a tilesheet for your background (or any image) automatically. This is another paid program, but the free version supports these features as well and can definitely make some difficult situations much simpler.

      When you drag your completed image into the Pyxel Edit window, the window that I’ve highlighted pops up. Set your tile width and height to 8, and click the button that says “Identify Tiles.” Once that is finished, click import and it will import the image as well as generating a tilesheet. This generated tilesheet already removes duplicate tiles, making it as optimized as it can be. If you click on the last tile on the tilesheet, it will tell you how many tiles there are. Once you have something that fits, you can then export just the tilesheet itself.

      Thanks for checking us out! Want to find out more about how to create graphics for other retro consoles? Check out our guide on Sega Genesis/Mega Drive graphics or the SNES graphics guide!

      If you're interested in more guidance for art on the NES, we have an in-depth look at making NES backgrounds here, and a cool trick for making huge boss sprites here.

      Sega Genesis/Mega Drive VDP Graphics Guide v1.2a (03/14/17)

      Sega Genesis/Mega Drive VDP Graphics Guide v1.2a (03/14/17)

      Mega Cat Studios

      OVERVIEW OF VDP CONCEPTS

      • VDP

        • "Video Display Processor"

        • Video controller chip that handles the Genesis' tile graphics, scroll planes, and sprites. Not actually a processor

      • VRAM

        • "Video RAM"

          • RAM used by the VDP

          • Holds tiles (8x8 px images)

      • Two main machine types

        • NTSC machines

          • "Sega Genesis", 60Hz machines, primarily found in the US

          • Resolutions

            • H40 mode - 320x224 px (40x28 tiles). More common resolution mode

            • H32 mode - 256x224 px (32x28 tiles). Less common resolution mode

          • Mega Cat games are NTSC releases, so use these resolutions!

        • PAL machines

          • "Sega Mega Drive", 50Hz machines, everywhere else

          • Resolution

            • H40 mode - 320x240 px (40x30 tiles). More common resolution mode

            • H 32 mode - 256x240 (32x30 tiles). Less common resolution mode

      NTSC Model 2 Sega Genesis

      PAL Model 2 Mega Drive
      (European)

      3 graphics planes

        • 2 scroll planes
          • Plane B - Background plane
            • Displays tile graphics via tilemaps
          • Plane A - Foreground plane
            • Displays tile graphics via tilemaps

            • Window subplane - Subplane for Plane A, with tile graphics that does not scroll with rest of plane
          • Each row of tiles is rendered column-by-column
          • Tiles on each plane can have priority: low or high.

      Tiles for a sprite rendered in normal format (4x4 tiles)

          • 1 sprite plane

            • Draws sprite tile graphics

            • Internally, sprites are rendered in reverse order; i.e., each column of tiles is rendered by rows

            • Sprites are positioned in a virtual 512x512 px space, with coordinate (128,128) being the top left corner of the TV display.

            • Genesis can display up to 80 hardware sprites on screen at once

            • Genesis can display ~20 sprites on the same scanline before sprite overflow issues occur and sprites are not displayed

            • For hardware sprites, sprite sizes are limited in size to (w x h) sizes, where w is width, and h is height, where each dimension is 1-4 tiles.

            • Sprites larger than hardware sprite sizes can be obtained by using multiple sprites

            • Like with planes, the tiles for sprites can have a low or high priority. Low priority sprites are displayed behind high priority tiles in other layers. (It's a little more complicated than this, but this is the basic concept in a nutshell)

      Tiles for a sprite internally rendered in sprite format (transposed, 4x4 tiles)

      Visualization of priority of plane layers

      Source: Genesis Software Manual

        • VDP CRAM ("Color RAM")

          • 4 palette lines, each with 16 color entries

          • Each color entry has a color depth of 4bpp (4 bits per pixel)

          • 1st color entry is the transparent color for tile art

          • Palette lines can be rendered to use slightly lighter or darker colors by toggling highlight or shadow modes, respectively

      BACKGROUNDS

      There are 2 tilemap planes available for use on the Sega Genesis: a background plane ("Plane B") and a foreground plane ("Plane A"). Depending on the machine type (NTSC or PAL) and the video mode used (H40 or H32 mode), a full-screen tilemap will take up either a width of 32 or 40 tiles by a height of 28 or 30 tiles. Each tile consists of an 8x8 px image, with each pixel corresponding to a color entry index (0-15). The window plane is technically a subplane for Plane A; its graphics will not be scrolled with the rest of Plane A. The planes can be used in many different ways, such as fullscreen foreground and background layers, or for a technique many Sega Genesis games are famous for,parallax scrolling. By scrolling certain rows of tiles on the planes at different rates, an illusion of depth is created. Tiles in the different planar tilemaps can have a priority setting: either low or high. This setting will determine if sprites (which also can have a low or high priority setting) are displayed below or above the tile.


      VSRAM (Video Scroll RAM)

      Layers Plane A and Plane B can have scroll plane tilemaps of sizes (w x h), where w is width in tiles, and h is height in tiles, and where each dimension can only be of a size of 32, 64, or 128 tiles. These scroll planes are "scrolled into/out" of the active display resolution (size determined by machine types and H32/H40 mode). Scroll planes of sizes 128x64/64x128 & 128x128 are invalid due. By default, the sections of VRAM at default VRAM address 0xC000 and 0xE000 are displayed as "garbage tiles", but actually each pixel of those "garbage tiles" compactly encodes the VSRAM tilemap. The user should never write real tiles to these "garbage tiles" or weird graphical bugs/crashes, slow down, or garbage tiles will appear in the scroll planes. Planes can use 1 of 3 different, scroll modes: by scanline, by tile, or block (a section of 2x2 tile). Each plane can be scrolled horizontal, vertically, or both.

      COLOR

      Mastering the Genesis’ color restrictions is probably the best thing you can do to get the most out of your graphics! Tiles can only make use of 1 of 4 palette lines at a time. Each palette line has 16 color entries. The 1st color entry is reserved for the transparent color, which is recommended to be a solid purple of color (255,0,255) (RGB). You may want to allocate 1 or 2 palettes to stay consistent throughout the game, for a particular usage. For example, palette line #1 could be used for your player character, while palette line #2 could be used for UI elements. Enemies, backgrounds, and other changing elements through the game can make good use of different palettes.

        To get the most out of the color in this piece, two palette lines were used; one for each tilemap plane layer. The first two images are each layer (Plane B and Plane A, respectively) shown separately, while the third image is the final fullscreen image using both planes combined. As each tile can only use the indexed colors from one palette line at a time, taking advantage of a dual-plane image setup like this allows many colors in tight spaces that only a single plane image wouldn’t allow enough colors for.

        Two common color palette techniques are palette cycling and raster effects. By changing the color of particular entries in individual palette lines in-game every few frames, all of the tiles utilizing that particular palette line and color index setting will update to the new color. This is used for effects such as waterfalls, pulsating lights, etc.

        Sample palette cycle effect for the flashing Beserk bars in Zombie Football League

        Raster effects are changing all or some of the palette line's colors after a certain scanline. Performing this technique is beyond the scope of this document, but basically is swapping out all or part of entire CRAM's colors after the electron beam of the TV is past a certain horizontal scanline. This is useful for techniques such as applying a different palette for objects that are underwater and is used for underwater colors in Labyrinth Zone for Sonic the Hedgehog.


        SPRITES


        The base idle position sprite for Ashley from Coffee Crisis

        Sprites for the Sega Genesis are defined as images with a size of (w x h), where w is the width in tiles, and h is the height in tiles, where each dimension can range from 1-4 tiles. Each sprite can use only one palette line at a time. Hardware sprites can have a max size of 4x4 tiles. The Sega Genesis can handle up to 80 sprites on screen, 20 sprites per scanline, though it’s worth staying under this limit to avoid slowdown. To overcome the hardware sprite limit, many games utilize multiple sprites together for one character/object to accommodate larger sizes. A classic pixel art principle is to keep your graphics at a resolution large enough to allow suitable detail and clarity, but small enough to easily animate. All Sega Genesis tile art should always be divisible by 8 pixels, to align with tile sizes! Sprites can be flipped horizontally ("hflip'd") and/or vertically ("vflip'd"), as well as have either a low or high priority flag set. This priority setting determines whether the sprite will be displayed above or below tiles in the other planes (which also have a low or high priority setting). Hardware sprites can also have a "link" value; each sprite must have its own, unique link value. Among other effects, sprites with lower link values are drawn above sprites with higher link values.

        ANIMATION


        A running armoured Minotaur football player, from Zombie Football League

        In most games, the graphics will be animated, not just static sprites. By changing frames for sprites over time, the illusion of movement can be achieved and is used to portray walking, attacking, getting hit, etc. Different games deserve different styles of animation, and there are many specific animation tutorials worth checking out online. For the Sega Genesis specifically, be mindful about the number of sprites and tiles each animation takes up, and be sure to not go overboard with the number of sprites in each animation, especially if it will cause game slowdown. Sprite animation is often a battle between keeping a low individual frame and tile count and an appealing motion; this especially applies to animation on the Sega Genesis too. Focus on creating clear, readable keyframes so that the action in your animation is apparent, and take advantage of holding certain frames for different time durations.

        A common animation technique used is commonly called "Dynamic Pattern Load Cues" (DPLC) among the Sonic the Hedgehog ROM hacking scene. This is the term coined for dynamically uploading the tiles for sprite frames into VRAM on-the-fly, rather than storing all of the tiles for all sprites frames into VRAM all at once. Many times, for detailed sprites (such as the player sprites), the number of tiles utilized for all of the sprite frames will take up too many VRAM tiles. By uploading only the tiles you need for the particular sprite frame being rendered, you conserve your limited VRAM memory to be used for other tile graphics. Unfortunately, the tiles used for DPLC will need to be uncompressed in ROM for the uploading to VRAM to be quick enough to not cause game slowdown. (Decompressing compressed art has CPU overhead and takes away too many CPU cycles.) The functions in SGDK's sprite engine (in header file ) generally utilize DPLC techniques to cut down on wasted tiles.


        RECOMMENDED DEBUGGING AND ART TOOLS
        Finding good software for creating retro graphics, quantizing pixel art into tiles, and reducing the color count to 4bpp can be difficult. Below is a list of the recommended art software to deal with retro graphics, and specialized emulators that allow the user to look at VRAM contents and planes

        Art software:

        • RetroGraphicsToolkit

        • Irfanview

          • Generic image viewer/editor, with plugins and very large support for many image file types

          • Can edit, export, and import palettes, as well as increase/decrease the color count of images, and view color count. Useful for preparing art image files for usage with SGDK's rescomp

          • FOSS software

          • Has PNG plugin in order to change color depth while preserving palette order

          • Info links

        • PCXpal

          • Useful software that can convert between several different palette formats.

          • Useful for converting to/from Megadrive .bin palettes and Irfanview's JASC palette format

          • Import formats

            • BMP,GIF,PCX images

            • GGD, GS*, MSD Genesis emulator savestates

            • Jasc, Megadrive, MS RIFF, Tile Layer Pro palette files

          • Export formats

            • Jasc, Megadrive, and Tile Layer Pro palettes

          • Info links

        Recommended specialty emulators for VDP debugging

        COMMERCIAL SEGA GENESIS GAMES TO REFERENCE


        There are plenty of awesome-looking Sega Genesis games to reference for various techniques and special effects. Such games include:

        • Streets of Rage series

        • The Sonic the Hedgehog series

          • Water palette raster effects

          • Sprite/tile priority (esp loops and dual-layer chunk system in Sonic 2 & Sonic 3/Knuckles)

          • High performance, fast, highly-polished game engine

          • Sprite DPLC

          • Great level design and art styles (esp. Sonic 3/Knuckles)

          • Palette cycling effects

          • Parallax effects

        • The Adventures of Batman and Robin

          • Tons of fancy graphical effects

        • Castlevania Bloodlines

        • Aladdin

        • Earthworm Jim series

          • Smooth animation

        • The Phantasy Star series

        • Red Zone

          • 1-bit, smooth, B&W video in the intro

          • Fake sprite and tilemap SW rotation!

          • Isometric/Top-down art style

        • Panorama Cottton (Jap), Street Racer

          • SNES Mode 7-like graphics, very complex line scrolling and graphical effects

        • Hard Drivin' and Race Drivin'

          • 3D, SW-rendered polygon graphics

        • Zero Tolerance and Beyond Zero Tolerance (unreleased)

          • DOOM-like SW raycaster

        • Toy Story

          • Palette raster effects to break the CRAM color limit for static cutscene images

          • DOOM-like raycaster for 1st-person level

          • Parallax effects for level geometry in 1st stage with Woody

        • Star Cruiser (Jap)

          • 3D, SW-rendered polygon graphics

        • Contra: Hard Corps

          • Giant Miniboss robot in the first stage is a tilemap with fake tilemap/sprite rotation

        • The massive homebrew RPG is known as Pier Solar

          • Great art

          • Worked on by a team of Genesis fans, gurus, and homebrew developers for several years

          • Massive 64Mb cartridge

        Take note of how different games take advantage of the Genesis' hardware restrictions, and how some games push the hardware to the limits. Streets of Rage and Batman excel with gritty urban locations. The Sonic games have bright, contrasting colors that make it easy to perceive Sonic’s surroundings despite the fast speed. Aladdin and Earthworm Jim have fluid, fun animations that emphasize the characters.

        REFERENCES/FOR FURTHER READING

        Thanks for reading! If you want more, you can read our NES graphics guide here, or check out our SNES graphics guide here!