init: base

1 files changed, 47 insertions, 0 deletions

diff --git a/source/base/base_stack.h b/source/base/base_stack.h
new file mode 100644
index 0000000..9b69e66
--- /dev/null
+++ b/source/base/base_stack.h
@@ -0,0 +1,47 @@
+#ifndef BASE_STACK_H
+#define BASE_STACK_H
+
+#if defined(PLATFORM_UNIX)
+#define StackCreate(size) unix_stack_create(size)
+#define StackDestroy(stack) unix_stack_destroy(stack)
+#elif defined(PLATFORM_WINDOWS)
+#define StackCreate(size) win32_stack_create(size)
+#define StackDestroy(stack) win32_stack_destroy(stack)
+#endif
+
+//-
+
+typedef struct MemStackHeader MemStackHeader;
+typedef struct MemStack MemStack;
+
+struct MemStackHeader {
+    u8 padding;
+    u8 previous_offset;
+};
+
+struct MemStack {
+    MemStackHeader *header;
+    u64 current_offset;
+    u64 capacity;
+    u8 *base_position; // TODO: why is this a (u8 *)?
+};
+
+//-
+
+internal MemStack *stack_push_align(MemStack *stack, u64 size, u8 alignment);
+internal MemStack *stack_resize_align(MemStack *stack, void *pointer, u64 old_size, u64 new_size,
+                                      u8 alignment);
+internal void *stack_push(MemStack *stack, u64 size);
+internal void stack_pop(MemStack *stack, void *pointer);
+internal void stack_clear(MemStack *stack);
+internal u8 calculate_padding(u64 pointer, u8 alignment, u64 header_size);
+internal MemStack *arena_to_stack(MemArena *arena, u64 size, u64 alignment);
+
+
+#define ArenaToStack(arena, size) arena_to_stack(arena, size);
+#define StackPushStruct(stack, type) (type *)stack_push((stack), sizeof(type))
+#define StackPushArray(stack, type, len) (type *)stack_push((stack), sizeof(type) * (len))
+#define StackPop(stack, pointer) stack_pop(stack, pointer)
+#define StackClear(stack) stack_clear(stack)
+
+#endif // BASE_STACK_H