1 files changed, 49 insertions, 0 deletions
diff --git a/rendy-memory/src/heaps/heap.rs b/rendy-memory/src/heaps/heap.rs
new file mode 100644
index 0000000..6595cbc
--- /dev/null
+++ b/rendy-memory/src/heaps/heap.rs
@@ -0,0 +1,49 @@
+use crate::utilization::*;
+
+#[derive(Debug)]
+pub(super) struct MemoryHeap {
+    size: u64,
+    used: u64,
+    effective: u64,
+}
+
+impl MemoryHeap {
+    pub(super) fn new(size: u64) -> Self {
+        MemoryHeap {
+            size,
+            used: 0,
+            effective: 0,
+        }
+    }
+
+    pub(super) fn available(&self) -> u64 {
+        if self.used > self.size {
+            log::warn!("Heap size exceeded");
+            0
+        } else {
+            self.size - self.used
+        }
+    }
+
+    pub(super) fn allocated(&mut self, used: u64, effective: u64) {
+        self.used += used;
+        self.effective += effective;
+        debug_assert!(self.used >= self.effective);
+    }
+
+    pub(super) fn freed(&mut self, used: u64, effective: u64) {
+        self.used -= used;
+        self.effective -= effective;
+        debug_assert!(self.used >= self.effective);
+    }
+
+    pub(super) fn utilization(&self) -> MemoryHeapUtilization {
+        MemoryHeapUtilization {
+            utilization: MemoryUtilization {
+                used: self.used,
+                effective: self.effective,
+            },
+            size: self.size,
+        }
+    }
+}