Split out the frame allocator

Used to be a part of main

1 files changed, 24 insertions, 0 deletions

diff --git a/src/allocator.c b/src/allocator.c
new file mode 100644
index 0000000..308b97c
--- /dev/null
+++ b/src/allocator.c
@@ -0,0 +1,24 @@
+#include "allocator.h"
+
+struct frame_allocator frame_allocator_create(size_t capacity) {
+  return (struct frame_allocator){
+      .capacity = capacity, .offset = 0, .buf = (uint8_t *)malloc(capacity)};
+}
+
+void frame_allocator_destroy(struct frame_allocator *alloc) {
+  free(alloc->buf);
+  alloc->buf = NULL;
+}
+
+void *frame_allocator_alloc(struct frame_allocator *alloc, size_t sz) {
+  if (alloc->offset + sz > alloc->capacity) {
+    return NULL;
+  }
+
+  void *mem = alloc->buf + alloc->offset;
+  alloc->offset += sz;
+
+  return mem;
+}
+
+void frame_allocator_clear(struct frame_allocator *alloc) { alloc->offset = 0; }