141 lines
3.2 KiB
Zig
141 lines
3.2 KiB
Zig
const app = @import("./app.zig");
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const coral = @import("coral");
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const ext = @import("./ext.zig");
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pub const file = @import("./file.zig");
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const heap = @import("./heap.zig");
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const kym = @import("./kym.zig");
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fn kym_handle_errors(info: kym.ErrorInfo) void {
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app.log_fail(info.message);
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var remaining_frames = info.frames.len;
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if (remaining_frames != 0) {
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app.log_fail("stack trace:");
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while (remaining_frames != 0) {
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remaining_frames -= 1;
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app.log_fail(info.frames[remaining_frames].name);
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}
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}
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}
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fn kym_log_info(env: *kym.RuntimeEnv) kym.RuntimeError!?*kym.RuntimeRef {
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app.log_info(try kym.unbox_string(env, try env.view_arg(0)));
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return null;
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}
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fn kym_log_warn(env: *kym.RuntimeEnv) kym.RuntimeError!?*kym.RuntimeRef {
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app.log_warn(try kym.unbox_string(env, try env.view_arg(0)));
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return null;
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}
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fn kym_log_fail(env: *kym.RuntimeEnv) kym.RuntimeError!?*kym.RuntimeRef {
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app.log_fail(try kym.unbox_string(env, try env.view_arg(0)));
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return null;
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}
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fn last_sdl_error() [:0]const u8 {
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return coral.io.slice_sentineled(@as(u8, 0), @as([*:0]const u8, @ptrCast(ext.SDL_GetError())));
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}
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pub fn run_app(file_access: file.Access) void {
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defer heap.trace_leaks();
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if (ext.SDL_Init(ext.SDL_INIT_EVERYTHING) != 0) {
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return app.log_fail(last_sdl_error());
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}
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defer ext.SDL_Quit();
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var script_env = kym.RuntimeEnv.make(heap.allocator, kym.ErrorHandler.from(kym_handle_errors)) catch {
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return app.log_fail("failed to initialize script runtime");
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};
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defer script_env.free();
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script_env.bind_syscalls(&.{
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.{
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.name = "log_info",
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.caller = kym.Caller.from(kym_log_info),
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},
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.{
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.name = "log_warn",
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.caller = kym.Caller.from(kym_log_warn),
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},
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.{
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.name = "log_fail",
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.caller = kym.Caller.from(kym_log_fail),
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},
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}) catch {
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return app.log_fail("failed to bind syscalls to script runtime");
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};
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var manifest = app.Manifest{};
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manifest.load(&script_env, file_access) catch return;
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const window = create: {
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const pos = ext.SDL_WINDOWPOS_CENTERED;
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const flags = 0;
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break: create ext.SDL_CreateWindow(&manifest.title, pos, pos, manifest.width, manifest.height, flags) orelse {
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return app.log_fail(last_sdl_error());
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};
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};
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defer ext.SDL_DestroyWindow(window);
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const renderer = create: {
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const default_driver_index = -1;
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const flags = ext.SDL_RENDERER_ACCELERATED;
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break: create ext.SDL_CreateRenderer(window, default_driver_index, flags) orelse {
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return app.log_fail(last_sdl_error());
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};
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};
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defer ext.SDL_DestroyRenderer(renderer);
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{
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var previous_ticks = ext.SDL_GetTicks64();
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while (true) {
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{
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var event = @as(ext.SDL_Event, undefined);
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while (ext.SDL_PollEvent(&event) != 0) {
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switch (event.type) {
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ext.SDL_QUIT => return,
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else => {},
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}
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}
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}
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{
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// Based on https://fabiensanglard.net/timer_and_framerate/index.php.
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const current_ticks = ext.SDL_GetTicks64();
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const milliseconds_per_second = 1000.0;
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const tick_frequency = @as(u64, @intFromFloat(milliseconds_per_second / manifest.tick_rate));
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while (previous_ticks < current_ticks) {
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previous_ticks += tick_frequency;
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}
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}
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_ = ext.SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
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_ = ext.SDL_RenderClear(renderer);
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_ = ext.SDL_RenderPresent(renderer);
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}
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}
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}
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