Description
Provided Files
● main.c
● myLib.c
● myLib.h
● spritesheet.bmp
● gameBg.bmp
● gameBg.c
● gameBg.h
Files to Edit/Add
● main.c
● mylib.c
● spritesheet.c
● spritesheet.h
● makefile
● .vscode
○ tasks.json
Instructions
In this lab, you will be completing several different TODOs, which will, piece by piece,
complete an animated goomba character that the player can control. This lab will provide
significantly more detail in the comments of the code, so READ VERY CAREFULLY. Your
code may not compile until you complete an entire TODO block, at which point the game
should compile with a new component of the final outcome (unless otherwise specified).
Note: Make sure to copy over your Makefile and .vscode/tasks.json from one of your
previous assignments.
TODO 1.0 – Loading and Enabling Sprites
Let’s set up sprites!
CS 2261 Spring 2021
● TODO 1.0
○ In main.c, #include spritesheet.h
● TODO 1.1
○ In initialize(), load the spritesheet palette and tiles into their desired spaces
in memory
■ HINT: The sprite palette is different from the background palette
(check myLib.h)
■ HINT: Which charblock do sprite tiles go in?
● TODO 1.2
○ In myLib.c, complete hideSprites()
○ In main.c, uncomment the hideSprites() call
● TODO 1.3
○ In initialize(), enable sprites
● Build and run. You should not see anything new. If you see anything in the top-left
(CORNERFACE), fix this before going further.
TODO 2.0
● At the bottom of initialize(), READ CAREFULLY all of the animation variables for the
goomba player
● Look back at the spritesheet to see how it is organized
TODO 2.1 – 2.9 – Animating Sprites
Let’s get the goomba showing and its animations working!
● TODO 2.1
○ If the sprite is not idle:
■ Set the previous state to the current state
■ Then reset the goomba’s state to idle
● TODO 2.2
○ Increment the goomba’s current frame
○ HINT: there are only numFrames number of frames, and the frames of the
animation must end up LOOPING
● TODO 2.3 – 2.6
○ Set the goomba’s aniState accordingly
● TODO 2.7
○ If the goomba is idle:
■ We want the current frame to be of the goomba standing (frame 0) in
whatever direction he was last facing (current state set to the
previous state)
○ Else:
■ Increment the animation counter
● TODO 2.8
CS 2261 Spring 2021
○ Set up all of the sprite attributes, place the sprite at index 0 of the
shadowOAM
■ Look at myLib.h for sprite stuff!
○ Hint: Open up spritesheet.bmp and look at how the sprites are organized.
Animation states correspond to columns, and frames are the rows of the
spritesheet
○ Hint: this sprite is 32 x 32, you are going to need to do some multiplication
when setting up ATTR2 TILEID
■ Each tile is 8×8
■ When the goomba is idle, where does that correspond to on the
spritesheet? (0,0) because the sprite begins at tile 0,0 and takes up 4
tiles wide and 4 tiles tall
● TODO 2.9
○ Copy the shadowOAM into the OAM
○ HINT: how many sprites can we have in the OAM? How many attributes does
each sprite have?
○ Build and run. You should be able to walk the player goomba around, see the
background repeat and all while the player is at the bottom-center of the
screen. If this is not the case, fix this before moving forward
TODO 3.0
● At the bottom of initialize(), READ CAREFULLY all of the animation variables for the
flowers
● Look back at the spritesheet to see how it is organized
TODO 3.1 – 3.9 – Animating Multiple Sprites
Let’s get multiple flowers showing and animating! These sprites will all be doing the same
animation (a single state) and it will be continuously looping, so no need to worry about
checking for button inputs here!
● TODO 3.1
○ Increment each flower’s current frame of animation every 12 frames of
gameplay
○ You will also need to increment each flower’s aniCounter
○ Refer to the code associated with TODO 2.2 for how to check for frames of
gameplay
○ HINT: there are only numFrames number of frames, and the frames of the
animation must end up LOOPING
● TODO 3.2
○ Loop through each flower and set up all of the sprite attributes
■ BE CAREFUL when placing the sprites in the shadowOAM as to not
overwrite where the player sprite is (shadowOAM[0])
■ Since we only have a single state for our flowers, it’s col value of
CS 2261 Spring 2021
TILEID will not change. However, now we are starting
from lower in the spritesheet, so we will need to add the starting tile
row (12) to our curFrame value calculation
■ Look at myLib.h for sprite stuff!
○ Hint: Open up spritesheet.bmp and look at how the sprites are organized.
Animation states correspond to columns, and frames are the rows of the
spritesheet
○ Hint: this sprite is 16 x 16, you are going to need to do some multiplication
when setting up ATTR2 TILEID for the curFrame
■ Each tile is 8×8
■ Where does the flower sprite start in the spritesheet? (0,12) — in tiles.
This location is the first frame of our flower
■ The sprite takes up 2 tiles wide and 2 tiles tall
● TODO 3.3
○ Build and run. You should now see 4 flowers at the bottom of the screen,
continuously moving up and down slightly and shining. They should follow
the player, stuck at the bottom of the screen as the player goomba moves.
You will know if it runs correctly if:
● You can walk the player around infinitely
● See your background repeat while the goomba stays in the middle/bottom of the
screen
● See the four flowers at the bottom of the screen continuously animate
● You DO NOT see corner face
Tips
● Follow each TODO in order, and only move forward if everything is correct
Submission Instructions
Zip up your entire project folder, including all source files, the Makefile, and everything
produced during compilation (including the .gba file). Submit this zip on Canvas. Name
your submission Lab07_FirstameLastname, for example: “Lab07_MadGoomba.zip”.
