Application Context Implementation #4
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@ -11,7 +11,9 @@ const sys = @import("./sys.zig");
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/// Entry point.
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///
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pub fn main() anyerror!void {
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return nosuspend await async sys.runGraphics(anyerror, run);
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var gpa = std.heap.GeneralPurposeAllocator(.{}){};
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return nosuspend await async sys.runGraphics(gpa.allocator(), anyerror, run);
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}
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test {
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66
src/sys.zig
66
src/sys.zig
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@ -35,6 +35,7 @@ pub const AppContext = opaque {
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/// Internal state of the event loop hidden from the API consumer.
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///
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const Implementation = struct {
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user_path_prefix: [*]u8,
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data_file_system: FileSystem,
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user_file_system: FileSystem,
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message_semaphore: *ext.SDL_sem,
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@ -104,6 +105,7 @@ pub const AppContext = opaque {
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ext.SDL_DestroyMutex(implementation.message_mutex);
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ext.SDL_DestroySemaphore(implementation.message_semaphore);
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ext.SDL_free(implementation.user_path_prefix);
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}
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///
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@ -134,14 +136,25 @@ pub const AppContext = opaque {
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///
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/// Returns the created [Implementation] value on success or [InitError] on failure.
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///
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fn init(data_archive_file_access: FileAccess,
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user_path_prefix: []const u8) InitError!Implementation {
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fn init(allocator: std.mem.Allocator,
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data_archive_file_access: FileAccess) InitError!Implementation {
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const user_path_prefix = ext.SDL_GetPrefPath("ona", "ona") orelse
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return error.OutOfMemory;
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return Implementation{
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.user_file_system = .{.native = .{.path_prefix =
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user_path_prefix[0 .. std.mem.len(user_path_prefix)]}},
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.message_semaphore = ext.SDL_CreateSemaphore(0) orelse return error.OutOfSemaphores,
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.message_mutex = ext.SDL_CreateMutex() orelse return error.OutOfMutexes,
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.data_file_system = .{.archive = .{.file_access = data_archive_file_access}},
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.user_file_system = .{.native = .{.path_prefix = user_path_prefix}},
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.user_path_prefix = user_path_prefix,
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.data_file_system = .{.archive = .{
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.file_access = data_archive_file_access,
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.index_cache = try FileSystem.ArchiveIndexCache.init(allocator),
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}},
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.message_thread = null,
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};
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}
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@ -351,7 +364,7 @@ pub const FileSystem = union(enum) {
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archive: struct {
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file_access: FileAccess,
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index_cache: *table.Dynamic([]const u8, ArchiveEntry, table.string_context),
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index_cache: ArchiveIndexCache,
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entry_table: [max_open_entries]ArchiveEntry =
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std.mem.zeroes([max_open_entries]ArchiveEntry),
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@ -368,6 +381,8 @@ pub const FileSystem = union(enum) {
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cursor: u64,
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};
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const ArchiveIndexCache = table.Hashed([]const u8, oar.Entry, table.string_context);
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///
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/// Platform-agnostic mechanism for referencing files and directories on a [FileSystem].
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///
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@ -447,23 +462,23 @@ pub const FileSystem = union(enum) {
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.archive => |*archive| {
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if (mode != .readonly) return error.ModeUnsupported;
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for (archive.entry_table) |_, index| {
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if (archive.entry_table[index].using == null) {
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const archive_path = path.buffer[0 .. path.length];
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for (archive.entry_table) |*entry| if (entry.using == null) {
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const entry_path = path.buffer[0 .. path.length];
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entry.* = .{
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.header = find_header: {
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if (archive.index_cache.lookup(entry_path)) |header|
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break: find_header header.*;
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const entry_header = archive.index_cache.lookup(archive_path) orelse {
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const header = oar.Entry.find(archive.file_access,
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archive_path) catch return error.FileNotFound;
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entry_path) catch return error.FileNotFound;
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archive.index_cache.insert(archive_path, header) catch {
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// If caching fails... oh well...
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};
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archive.index_cache.insert(entry_path, header) catch {};
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break header;
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};
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break: find_header header;
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},
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archive.entry_table[index] = .{
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.header = entry_header,
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.using = &archive.file_access,
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.cursor = 0,
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};
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@ -527,7 +542,7 @@ pub const FileSystem = union(enum) {
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};
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return FileAccess{
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.context = &archive.entry_table[index],
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.context = entry,
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.implementation = &.{
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.close = Implementation.close,
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@ -538,8 +553,7 @@ pub const FileSystem = union(enum) {
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.seekToEnd = Implementation.seekToEnd,
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},
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};
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}
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}
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};
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return error.OutOfFiles;
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},
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@ -805,7 +819,7 @@ pub const RunError = error {
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/// Should an error from `run` occur, an `Error` is returned, otherwise a [RunError] is returned if
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/// the underlying runtime fails and is logged.
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///
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pub fn runGraphics(comptime Error: anytype,
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pub fn runGraphics(allocator: std.mem.Allocator, comptime Error: anytype,
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comptime run: GraphicsRunner(Error)) (RunError || Error)!void {
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if (ext.SDL_Init(ext.SDL_INIT_EVERYTHING) != 0) {
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@ -841,14 +855,6 @@ pub fn runGraphics(comptime Error: anytype,
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defer ext.SDL_DestroyRenderer(renderer);
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const user_path_prefix = ext.SDL_GetPrefPath("ona", "ona") orelse {
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ext.SDL_LogCritical(ext.SDL_LOG_CATEGORY_APPLICATION, "Failed to load user path");
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return error.InitFailure;
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};
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defer ext.SDL_free(user_path_prefix);
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var cwd_file_system = FileSystem{.native =.{.path_prefix = "./"}};
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var data_archive_file_access = try (try cwd_file_system.
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@ -856,9 +862,7 @@ pub fn runGraphics(comptime Error: anytype,
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defer data_archive_file_access.close();
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var app_context = AppContext.Implementation.init(data_archive_file_access,
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user_path_prefix[0 .. std.mem.len(user_path_prefix)]) catch |err| {
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var app_context = AppContext.Implementation.init(allocator, data_archive_file_access) catch |err| {
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ext.SDL_LogCritical(ext.SDL_LOG_CATEGORY_APPLICATION, switch (err) {
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error.OutOfMemory => "Failed to allocate necessary memory",
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error.OutOfMutexes => "Failed to create file-system work lock",
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|
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@ -1,61 +1,119 @@
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const std = @import("std");
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pub fn Dynamic(comptime Key: type, comptime Value: type, comptime key_context: KeyContext(Key)) type {
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///
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/// Returns a hash-backed table type of `Value`s indexed by `Key` and using `key_context` as the key
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/// context.
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///
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pub fn Hashed(comptime Key: type, comptime Value: type,
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comptime key_context: KeyContext(Key)) type {
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const Allocator = std.mem.Allocator;
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return struct {
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load_maximum: f32,
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buckets_used: usize,
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allocator: Allocator,
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load_limit: f32,
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buckets: []Bucket,
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filled: usize,
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///
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///
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/// A slot in the hash table.
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///
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const Bucket = struct {
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maybe_entry: ?struct {
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key: Key,
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value: Value,
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},
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} = null,
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maybe_next_index: ?usize,
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maybe_next_index: ?usize = null,
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};
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///
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///
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/// Hash table type.
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///
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const Self = @This();
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///
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/// Searches for `key` to delete it, returning the deleted value or `null` if no matching
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/// key was found.
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///
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///
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pub fn delete(self: Self, key: Key) bool {
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_ = key;
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_ = self;
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pub fn remove(self: Self, key: Key) ?Value {
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var bucket = &(self.buckets[@mod(key_context.hash(key), self.buckets.len)]);
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if (bucket.maybe_entry) |*entry| if (key_context.equals(entry.key, key)) {
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defer entry.value = null;
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self.filled -= 1;
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return entry.value;
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};
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while (bucket.maybe_next_index) |index| {
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bucket = &(self.buckets[index]);
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if (bucket.maybe_entry) |*entry| if (key_context.equals(entry.key, key)) {
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defer entry.value = null;
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self.filled -= 1;
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return entry.value;
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};
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}
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||||
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return null;
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}
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|
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pub fn init(allocator: Allocator) Allocator.Error!Self {
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return Self{
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.buckets = try allocator.alloc(Bucket, 4),
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.filled = 0,
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.allocator = allocator,
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.load_limit = 0.75,
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};
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}
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|
||||
///
|
||||
/// Attempts to insert the value at `key` to be `value` in `self`, returning an
|
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/// [InsertError] if it fails.
|
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///
|
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///
|
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pub fn insert(self: Self, key: Key, value: Value) InsertError!void {
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if ((@intToFloat(f32, self.buckets_used) / @intToFloat(
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f32, self.buckets.len)) >= self.load_maximum) try self.rehash();
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pub fn insert(self: *Self, key: Key, value: Value) InsertError!void {
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if (self.loadFactor() >= self.load_limit) {
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const old_buckets = self.buckets;
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||||
|
||||
defer self.allocator.free(old_buckets);
|
||||
|
||||
self.buckets = try self.allocator.alloc(Bucket, old_buckets.len * 2);
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||||
|
||||
for (old_buckets) |bucket, index| self.buckets[index] = bucket;
|
||||
}
|
||||
|
||||
var hash = @mod(key_context.hash(key), self.buckets.len);
|
||||
|
||||
while (true) {
|
||||
const bucket = &(self.buckets[hash]);
|
||||
|
||||
const entry = &(bucket.maybe_entry orelse {
|
||||
if (key_context.equals((bucket.maybe_entry orelse {
|
||||
bucket.maybe_entry = .{
|
||||
.key = key,
|
||||
.value = value
|
||||
};
|
||||
});
|
||||
|
||||
if (key_context.equals(entry.key, key)) return error.KeyExists;
|
||||
self.filled += 1;
|
||||
|
||||
hash = @mod(hashHash(hash), self.buckets.len);
|
||||
break;
|
||||
}).key, key)) return error.KeyExists;
|
||||
|
||||
hash = @mod(hash + 1, self.buckets.len);
|
||||
}
|
||||
}
|
||||
|
||||
///
|
||||
/// Returns the current load factor of `self`, which is derived from the number of capacity
|
||||
/// that has been filled.
|
||||
///
|
||||
pub fn loadFactor(self: Self) f32 {
|
||||
return @intToFloat(f32, self.filled) / @intToFloat(f32, self.buckets.len);
|
||||
}
|
||||
|
||||
///
|
||||
/// Searches for a value indexed with `key` in `self`, returning it or `null` if no matching
|
||||
/// entry was found.
|
||||
|
@ -81,7 +139,7 @@ pub fn Dynamic(comptime Key: type, comptime Value: type, comptime key_context: K
|
|||
///
|
||||
///
|
||||
///
|
||||
pub const InsertError = std.mem.Allocator || error {
|
||||
pub const InsertError = std.mem.Allocator.Error || error {
|
||||
KeyExists,
|
||||
};
|
||||
|
||||
|
|
Loading…
Reference in New Issue