notes:data:fall2023:projects:ttb0
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| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| notes:data:fall2023:projects:ttb0 [2023/09/11 21:42] – [MALLOC’ED ARRAY OF STRUCTS] mfee1 | notes:data:fall2023:projects:ttb0 [2023/09/14 02:58] (current) – [MALLOC’ED ARRAY] cfoster8 | ||
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| Line 14: | Line 14: | ||
| <code bash> | <code bash> | ||
| - | scp sprites.png username@lab46.g7n.org: | + | scp sprites.png username@lab46.g7n.org: |
| </ | </ | ||
| If necessary, this is how you would get the desired file onto your PI: | If necessary, this is how you would get the desired file onto your PI: | ||
| <code bash> | <code bash> | ||
| - | scp sprites.png username@raspberrypi: | + | scp sprites.png username@raspberrypi: |
| </ | </ | ||
| ===Adding Sprites To Game=== | ===Adding Sprites To Game=== | ||
| - | Once you have your sprites .png file on lab46 and on your PI it is now time to load them into the cartridge. To do this open your make.sh file. | + | Once you have your sprites .png file on lab46 and on your PI it is now time to load them into the cartridge.\\ |
| + | Make sure your texture.png is in your ttb0 directory or you supply the correct path to the file. | ||
| + | |||
| + | To add them to the cartridge | ||
| Once in the make.sh file, add the following lines: | Once in the make.sh file, add the following lines: | ||
| Line 34: | Line 37: | ||
| </ | </ | ||
| - | " | + | " |
| After including the texture file in make.sh you also need to add it to your .xml file. To do so, open your .xml file and add the following: | After including the texture file in make.sh you also need to add it to your .xml file. To do so, open your .xml file and add the following: | ||
| Line 49: | Line 52: | ||
| =====STRUCT===== | =====STRUCT===== | ||
| ===Making Brick Struct=== | ===Making Brick Struct=== | ||
| - | When making your structure for the brick, it is important to remember that every time the ball hits the brick it needs to disappear. This means that inside the brick structure, you need to have a flag. | + | When making your structure for the brick, it is important to remember that every time the ball hits the brick it needs to disappear. This means that inside the brick structure, you need to have a flag, in the below example the flag would be a boolean named Active. The value for a particular index' |
| Here is a simple brick structure that you can add or build onto if necessary: | Here is a simple brick structure that you can add or build onto if necessary: | ||
| Line 63: | Line 66: | ||
| =====POINTERS===== | =====POINTERS===== | ||
| - | A pointer points to and references a location in memory. We can obtain the value that is stored at that location by dereferencing | + | A pointer points to and references a location in memory. We can obtain the value that is stored at that location by de-referencing |
| =====MALLOC===== | =====MALLOC===== | ||
| Memory Allocation. This is a way to perform memory management manually for dynamic memory. The syntax for malloc is below. | Memory Allocation. This is a way to perform memory management manually for dynamic memory. The syntax for malloc is below. | ||
| - | ptr = (cast-type*) malloc(byte-size); | + | ptr = (cast-type*)malloc(byte-size); |
| + | |||
| + | |||
| + | | ||
| =====MALLOC’ED ARRAY===== | =====MALLOC’ED ARRAY===== | ||
| - | ====ACCESSING WITH POINTER ARITHMETIC==== | + | The array exists as a linear allocation of memory, and any particular value in the array can be accessed by adding the value of that location to the pointer when calling it |
| + | Example: | ||
| + | (*(b_arr + 0)).x = 20; | ||
| + | would make the first x value of the array 20 and | ||
| + | (*(b_arr + 1)).x = 30; | ||
| + | would make the second x value of the array 30, and so on | ||
| + | ====ACCESSING WITH POINTER ARITHMETIC==== | ||
| + | Pointers to structs can be accessed the same way a class can, like so | ||
| + | [POINTER NAME].[VARIABLE NAME] = [VARIABLE VALUE] | ||
| + | a more practical example would be | ||
| + | (*b_arr).x = 64 | ||
| + | or some such, it functions as classes would in C++, we just need to make them ourselves since this is just C | ||
| =====MALLOC’ED ARRAY OF STRUCTS===== | =====MALLOC’ED ARRAY OF STRUCTS===== | ||
| Line 77: | Line 94: | ||
| ptr = (Brick *)malloc(sizeof(Brick)*number_of_bricks); | ptr = (Brick *)malloc(sizeof(Brick)*number_of_bricks); | ||
| + | Brick*ptr = NULL; | ||
| | | ||
| With Brick being a struct. | With Brick being a struct. | ||
| + | You need to make sure you set the ptr to = NULL before you use it as that is creating it and it needs a value. | ||
| <code C> | <code C> | ||
| free( ptr ); | free( ptr ); | ||
notes/data/fall2023/projects/ttb0.1694468544.txt.gz · Last modified: 2023/09/11 21:42 by mfee1
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