base progress

2026-08-05 23:28:45 +00:00 · 2025-02-01 22:38:48 -05:00
parent b414214aa4
commit 97e54f15a3
31 changed files with 429 additions and 239 deletions
@@ -0,0 +1,82 @@
+#ifdef MD_INTELLISENSE_DIRECTIVES
+#pragma once
+#include "macros.h"
+#include "base_types.h"
+#endif
+
+// Copyright (c) 2024 Epic Games Tools
+// Licensed under the MIT license (https://opensource.org/license/mit/)
+
+////////////////////////////////
+//~ rjf: Constants
+
+#define MD_ARENA_HEADER_SIZE 64
+
+////////////////////////////////
+//~ rjf: Types
+
+typedef U32 ArenaFlags;
+enum
+{
+	ArenaFlag_NoChain    = ( 1 << 0),
+	ArenaFlag_LargePages = ( 1 << 1),
+};
+
+typedef struct ArenaParams ArenaParams;
+struct ArenaParams
+{
+	ArenaFlags flags;
+	U64        reserve_size;
+	U64        commit_size;
+	void*      optional_backing_buffer;
+};
+
+typedef struct Arena Arena;
+struct Arena
+{
+	Arena*     prev;    // previous arena in chain
+	Arena*     current; // current arena in chain
+	ArenaFlags flags;
+	U32        cmt_size;
+	U64        res_size;
+	U64        base_pos;
+	U64        pos;
+	U64        cmt;
+	U64        res;
+};
+static_assert(sizeof(Arena) <= MD_ARENA_HEADER_SIZE, "sizeof(Arena) <= MD_ARENA_HEADER_SIZE");
+
+typedef struct TempArena TempArena;
+struct TempArena
+{
+	Arena* arena;
+	U64    pos;
+};
+
+////////////////////////////////
+//~ rjf: Arena Functions
+
+//- rjf: arena creation/destruction
+internal Arena* arena_alloc_(ArenaParams *params);
+#define         arena_alloc(...) arena_alloc_( & ( ArenaParams) { .reserve_size = MB(64), .commit_size = KB(64), __VA_ARGS__ } )
+
+internal void arena_release(Arena *arena);
+
+//- rjf: arena push/pop/pos core functions
+internal void *arena_push(Arena *arena, U64 size, U64 align);
+internal U64   arena_pos(Arena *arena);
+internal void  arena_pop_to(Arena *arena, U64 pos);
+
+//- rjf: arena push/pop helpers
+internal void arena_clear(Arena *arena);
+internal void arena_pop(Arena *arena, U64 amt);
+
+//- rjf: temporary arena scopes
+internal TempArena temp_arena_begin(Arena *arena);
+internal void      temp_arena_end(TempArena temp);
+
+//- rjf: push helper macros
+#define push_array_no_zero_aligned(a, T, c, align) (T *)arena_push((a), sizeof(T)*(c), (align))
+#define push_array_aligned(a, T, c, align)         (T *)memory_zero(push_array_no_zero_aligned(a, T, c, align), sizeof(T)*(c))
+#define push_array_no_zero(a, T, c)                     push_array_no_zero_aligned(a, T, c, max(8, align_of(T)))
+#define push_array(a, T, c)                             push_array_aligned(a, T, c, max(8, align_of(T)))