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keep track of which objects have been assigned

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This commit is contained in:
Corwin Kuiper 2021-06-04 18:36:23 +01:00
parent 9fad597844
commit a7cb7ea7b4
1 changed files with 28 additions and 13 deletions
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41
agb/src/display/object.rs
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@ -1,4 +1,5 @@
use super::DISPLAY_CONTROL;
use crate::bitarray::Bitarray;
use crate::memory_mapped::MemoryMapped1DArray;
const OBJECT_ATTRIBUTE_MEMORY: MemoryMapped1DArray<u16, 512> =
@ -6,8 +7,8 @@ const OBJECT_ATTRIBUTE_MEMORY: MemoryMapped1DArray<u16, 512> =
/// Handles distributing objects and matricies along with operations that effect all objects.
pub struct ObjectControl {
object_count: u8,
affine_count: u8,
objects: Bitarray<4>,
affines: Bitarray<1>,
}
/// The standard object, without rotation.
@ -227,8 +228,8 @@ impl ObjectControl {
unsafe { o.commit(index) };
}
ObjectControl {
object_count: 0,
affine_count: 0,
objects: Bitarray::new(),
affines: Bitarray::new(),
}
}
@ -246,14 +247,32 @@ impl ObjectControl {
DISPLAY_CONTROL.set(disp);
}
fn get_unused_object_index(&mut self) -> u8 {
for index in 0..128 {
if self.objects.get(index).unwrap() == false {
self.objects.set(index, true);
return index as u8;
}
}
panic!("object id must be less than 128");
}
fn get_unused_affine_index(&mut self) -> u8 {
for index in 0..32 {
if self.affines.get(index).unwrap() == false {
self.affines.set(index, true);
return index as u8;
}
}
panic!("affine id must be less than 32");
}
/// Get an unused standard object. Currently dropping an unused object will
/// not free this. You should either keep around all objects you need
/// forever or drop and reobtain ObjectControl. Panics if more than 128
/// objects are obtained.
pub fn get_object_standard(&mut self) -> ObjectStandard {
let id = self.object_count;
self.object_count += 1;
assert!(id < 128, "object id must be less than 128");
let id = self.get_unused_object_index();
ObjectStandard {
attributes: ObjectAttribute::new(),
id,
@ -265,9 +284,7 @@ impl ObjectControl {
/// forever or drop and reobtain ObjectControl. Panics if more than 128
/// objects are obtained.
pub fn get_object_affine(&mut self) -> ObjectAffine {
let id = self.object_count;
self.object_count += 1;
assert!(id < 128, "object id must be less than 128");
let id = self.get_unused_object_index();
ObjectAffine {
attributes: ObjectAttribute::new(),
id,
@ -280,9 +297,7 @@ impl ObjectControl {
/// need forever or drop and reobtain ObjectControl. Panics if more than 32
/// affine matricies are obtained.
pub fn get_affine(&mut self) -> AffineMatrix {
let id = self.affine_count;
self.affine_count += 1;
assert!(id < 32, "affine id must be less than 32");
let id = self.get_unused_affine_index();
AffineMatrix {
attributes: AffineMatrixAttributes {
p_a: 0,