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#include "alloc.h"
#include "maths.h"
#include "platform.h"
#include <assert.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
void *vgltf_allocator_allocate(struct vgltf_allocator *allocator, size_t size) {
assert(allocator);
return allocator->allocate(size, allocator->ctx);
}
void *vgltf_allocator_allocate_aligned(struct vgltf_allocator *allocator,
size_t alignment, size_t size) {
assert(allocator);
return allocator->allocate_aligned(alignment, size, allocator->ctx);
}
void *vgltf_allocator_allocate_array(struct vgltf_allocator *allocator,
size_t count, size_t item_size) {
assert(allocator);
return allocator->allocate_array(count, item_size, allocator->ctx);
}
void *vgltf_allocator_reallocate(struct vgltf_allocator *allocator, void *ptr,
size_t old_size, size_t new_size) {
assert(allocator);
return allocator->reallocate(ptr, old_size, new_size, allocator->ctx);
}
void vgltf_allocator_free(struct vgltf_allocator *allocator, void *ptr) {
assert(allocator);
allocator->free(ptr, allocator->ctx);
}
static void *memory_allocate(size_t size, void *ctx) {
(void)ctx;
void *ptr = malloc(size);
if (!ptr) {
VGLTF_PANIC("Couldn't allocate memory (out of mem?)");
}
return ptr;
}
static void *memory_allocate_aligned(size_t alignment, size_t size, void *ctx) {
(void)ctx;
#ifdef VGLTF_PLATFORM_WINDOWS
void *ptr = _aligned_malloc(size, VGLTF_MAX(alignment, sizeof(void *)));
#else
void *ptr = aligned_alloc(VGLTF_MAX(alignment, sizeof(void *)), size);
#endif
if (!ptr) {
VGLTF_PANIC("Couldn't allocate aligned memory (out of mem?)");
}
return ptr;
}
static void *memory_allocate_array(size_t count, size_t item_size, void *ctx) {
(void)ctx;
void *ptr = calloc(count, item_size);
if (!ptr) {
VGLTF_PANIC("Couldn't allocate memory (out of mem?)");
}
return ptr;
}
static void *memory_reallocate(void *ptr, size_t old_size, size_t new_size,
void *ctx) {
(void)old_size;
(void)ctx;
ptr = realloc(ptr, new_size);
if (!ptr) {
VGLTF_PANIC("Couldn't allocate memory (out of mem?)");
}
return ptr;
}
static void memory_free(void *ptr, void *ctx) {
(void)ctx;
free(ptr);
}
thread_local struct vgltf_allocator system_allocator = {
.allocate = memory_allocate,
.allocate_aligned = memory_allocate_aligned,
.allocate_array = memory_allocate_array,
.reallocate = memory_reallocate,
.free = memory_free};
void vgltf_arena_init(struct vgltf_allocator *allocator, struct vgltf_arena *arena,
size_t size) {
assert(allocator);
assert(arena);
arena->size = 0;
arena->capacity = size;
arena->data = vgltf_allocator_allocate(allocator, size);
}
void vgltf_arena_deinit(struct vgltf_allocator *allocator,
struct vgltf_arena *arena) {
assert(allocator);
assert(arena);
vgltf_allocator_free(allocator, arena->data);
}
void *vgltf_arena_allocate(struct vgltf_arena *arena, size_t size) {
assert(arena);
assert(arena->size + size <= arena->capacity);
void *ptr = arena->data + arena->size;
arena->size += size;
return ptr;
}
void *vgltf_arena_allocate_array(struct vgltf_arena *arena, size_t count,
size_t item_size) {
assert(arena);
void *ptr = vgltf_arena_allocate(arena, count * item_size);
memset(ptr, 0, count * item_size);
return ptr;
}
void vgltf_arena_reset(struct vgltf_arena *arena) {
assert(arena);
arena->size = 0;
}
static void *arena_allocator_allocate(size_t size, void *ctx) {
assert(ctx);
return vgltf_arena_allocate(ctx, size);
}
static void *arena_allocator_allocate_aligned(size_t alignment, size_t size,
void *ctx) {
assert(ctx);
if (alignment < sizeof(void *) || (alignment & (alignment - 1)) != 0) {
return NULL;
}
void *ptr = vgltf_arena_allocate(ctx, size + alignment - 1 + sizeof(void *));
if (!ptr) {
return NULL;
}
return (void *)(((uintptr_t)ptr + sizeof(void *) + alignment - 1) &
~(alignment - 1));
}
static void *arena_allocator_allocate_array(size_t count, size_t item_size,
void *ctx) {
assert(ctx);
return vgltf_arena_allocate_array(ctx, count, item_size);
}
static void *arena_allocator_reallocate(void *ptr, size_t old_size,
size_t new_size, void *ctx) {
assert(ptr);
assert(ctx);
void *new_ptr = vgltf_arena_allocate(ctx, new_size);
memcpy(new_ptr, ptr, old_size);
return new_ptr;
}
static void arena_allocator_free(void *ptr, void *ctx) {
assert(ctx);
(void)ptr;
}
struct vgltf_allocator vgltf_arena_allocator(struct vgltf_arena *arena) {
return (struct vgltf_allocator){
.ctx = arena,
.allocate = arena_allocator_allocate,
.allocate_aligned = arena_allocator_allocate_aligned,
.allocate_array = arena_allocator_allocate_array,
.reallocate = arena_allocator_reallocate,
.free = arena_allocator_free};
}
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