implemented arena allocator

assets/shaders/shader.metal

@@ -1,9 +0,0 @@
-vertex float4 basic_vertex(                           // 1
-  const device packed_float3* vertex_array [[ buffer(0) ]], // 2
-  unsigned int vid [[ vertex_id ]]) {                 // 3
-  return float4(vertex_array[vid], 1.0);              // 4
-}
-
-fragment half4 basic_fragment() { // 1
-  return half4(1.0);              // 2
-}

core/arena.c

@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: BSD-3-Clause
+#include "arena.h"
+#include <stdlib.h>
+
+struct arena_allocator *arena_init(usize size)
+{
+	struct arena_allocator *allocator = (struct arena_allocator *) malloc(sizeof(struct arena_allocator));
+	allocator->size = size;
+	allocator->base = (usize) malloc(size);
+	allocator->position = 0;
+
+	return allocator;
+}
+
+void arena_deinit(struct arena_allocator *allocator)
+{
+	free((void *)allocator->base);
+	free((void *)allocator);
+}
+
+void *arena_alloc(struct arena_allocator *allocator, usize size)
+{
+	void *ptr = (void *)(allocator->base + allocator->position);
+	allocator->position += size;
+	return ptr;
+}
+
+void *arena_zalloc(struct arena_allocator *allocator, usize size)
+{
+	void *ptr = arena_alloc(allocator, size);
+	for (usize i=0; i < size; i++) {
+		((u8 *)ptr)[i] = 0x0;
+	}
+
+	return ptr;
+}
+
+void arena_bump(struct arena_allocator *allocator)
+{
+	allocator->position = 0;
+}

core/arena.h

@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: BSD-3-Clause
+#ifndef ARENA_H
+#define ARENA_H
+
+#include "../types.h"
+
+/*
+ * An arena is a fast allocator that just
+ * keeps everything in a contiguous chunk
+ * of memory and moves a "pointer" when
+ * allocating new memory. The allocated
+ * memory is then free'd all at once.
+ */
+struct arena_allocator {
+	usize size;
+	usize base;
+	usize position;
+};
+
+
+/* Create a new arena allocator of size `size` */
+struct arena_allocator *arena_init(usize size);
+/* Destroy the allocator and */
+void arena_deinit(struct arena_allocator *allocator);
+
+/*
+ * Allocate a chunk of memory of size `size` on the
+ * arena.
+ */
+void *arena_alloc(struct arena_allocator *allocator, usize size);
+/*
+ * Same as `arena_alloc()` but also set all the allocated
+ * memory to zero.
+ */
+void *arena_zalloc(struct arena_allocator *allocator, usize size);
+/*
+ * Free all the allocated memory at once.
+ * This just sets the allocator cursor to its
+ * starting position.
+ */
+void arena_bump(struct arena_allocator *allocator);
+
+#endif

makefile

@@ -2,13 +2,18 @@
 
 include config.mk
 
-SRC:=topaz.c linear.c
+SRC:=\
+     topaz.c\
+     linear.c\
+     core/arena.c
 
 ifeq (${BACKEND},gl)
-	SRC += gl/gl.c gl/platform.c
+	SRC += gl/gl.c\
+	       gl/platform.c
 endif
 ifeq (${BACKEND},vk)
-	SRC += vk/platform.c
+	SRC += vk/platform.c\
+	       vk/renderer.c
 endif
 
 OBJ:=${SRC:.c=.o}