From dcd126647799a6d5e9ec18b7e8ca820d8e5573dc Mon Sep 17 00:00:00 2001
From: krzosa <krzosa.karol@gmail.com>
Date: Sat, 4 Jan 2025 11:03:36 +0100
Subject: [PATCH] sketch out os api, binary stream writer in js, app sleep when
 no animation, local and universal time

---
 build_file.c           |   3 +-
 package/index.html     | 131 +++++++++++++++++++++++++++++++++--------
 src/app/app_wasm.c     |  18 ++----
 src/app/app_wasm.html  | 131 +++++++++++++++++++++++++++++++++--------
 src/app/app_win32.c    |   2 +-
 src/core/core_string.h |  18 ++++++
 src/os/os.c            |   7 +++
 src/os/os.h            |  40 ++++++++++++-
 src/os/os_unix.c       |   2 +-
 src/os/os_wasm.c       |  20 ++++++-
 src/os/os_win32.c      |   2 +-
 src/wasm_app/main.c    |  14 ++++-
 todo.txt               |  15 +----
 13 files changed, 316 insertions(+), 87 deletions(-)

diff --git a/build_file.c b/build_file.c
index 70170aa..5b091ac 100644
--- a/build_file.c
+++ b/build_file.c
@@ -6,7 +6,6 @@
 #include "src/meta/build_tool.c"
 #include "src/meta/parser.c"
 #include "src/meta/serialize.c"
-
 #include "src/app/app.meta.c"
 
 void list_files_recursive(sb8_t *sb, s8_t path) {
@@ -87,6 +86,7 @@ int main(int argc, char **argv) {
 
 
     if (wasm_target) {
+        os_copy("../src/app/app_wasm.html", "../package/index.html", os_copy_overwrite);
         ok = os_systemf(
             "clang.exe ../src/wasm_app/main.c -o main.wasm"
             " -Oz -g -I../src"
@@ -96,7 +96,6 @@ int main(int argc, char **argv) {
             " -Wl,-export-dynamic,--allow-undefined,--import-memory,--no-entry,--initial-memory=131072000,--max-memory=4294967296"
         );
         os_copy("main.wasm", "../package/main.wasm", os_copy_overwrite);
-        os_copy("../src/app/app_wasm.html", "../package/index.html", os_copy_overwrite);
         if (ok != 0) return ok;
     }
     return ok;
diff --git a/package/index.html b/package/index.html
index ada7752..5bc2f8c 100644
--- a/package/index.html
+++ b/package/index.html
@@ -33,6 +33,33 @@
 </html>
 <script>
 
+class stream_t {
+    constructor(dataview, ptr, len) {
+        this.dv = dataview;
+        this.ptr = ptr;
+        this.len = len;
+        this.i = 0;
+    }
+
+    write_u32(value) {
+        if (this.i + 4 <= this.len) {
+            this.dv.setUint32(this.ptr + this.i, value, true);
+            this.i += 4;
+        } else {
+            console.log("reached end of buffer while stream writing");
+        }
+    }
+
+    write_u16(value) {
+        if (this.i + 2 <= this.len) {
+            this.dv.setUint16(this.ptr + this.i, value, true);
+            this.i += 2;
+        } else {
+            console.log("reached end of buffer while stream writing");
+        }
+    }
+}
+
 class memory_t {
     exports = null; // this is set after wasm module created
     constructor(wasm_memory) {
@@ -58,12 +85,16 @@ class memory_t {
         this.u8[ptr + i] = 0;
     }
 
-    write_string(temp, string) {
+    write_string_to_cglobal(temp, string) {
         const ptr = this.exports[temp].value;
         const len = this.data_view.getInt32(this.exports[temp + "_len"].value, true);
         this.write_string_into_cmemory(ptr, len, string);
         return ptr;
     }
+
+    stream_write(ptr, len) {
+        return new stream_t(this.data_view, ptr, len);
+    }
 }
 
 const canvas = document.getElementById("canvas");
@@ -78,7 +109,36 @@ const mem = new memory_t(new WebAssembly['Memory']({ initial: 2000, maximum: 655
 
     const request = await fetch('main.wasm');
     const binary = await request.arrayBuffer();
-    const wasm_imports = {
+
+    const wasm_os_imports = {
+        wasm_local_time_now: (ptr, len) => {
+            const date = new Date();
+            const stream = mem.stream_write(ptr, len);
+            stream.write_u16(date.getMilliseconds());
+            stream.write_u16(date.getSeconds());
+            stream.write_u16(date.getMinutes());
+            stream.write_u16(date.getHours());
+            stream.write_u16(date.getDate());
+            stream.write_u16(date.getMonth());
+            stream.write_u16(date.getFullYear());
+        },
+
+        wasm_universal_time_now: (ptr, len) => {
+            const date = new Date();
+            const stream = mem.stream_write(ptr, len);
+            stream.write_u16(date.getUTCMilliseconds());
+            stream.write_u16(date.getUTCSeconds());
+            stream.write_u16(date.getUTCMinutes());
+            stream.write_u16(date.getUTCHours());
+            stream.write_u16(date.getUTCDate());
+            stream.write_u16(date.getUTCMonth());
+            stream.write_u16(date.getUTCFullYear());
+        },
+
+        wasm_milliseconds_now: () => { return performance.now(); },
+    };
+
+    let wasm_app_imports = {
 
         // core
         memory: mem.mem,
@@ -86,7 +146,6 @@ const mem = new memory_t(new WebAssembly['Memory']({ initial: 2000, maximum: 655
         wasm_alert: (str, len) => { alert(mem.read_cstr(str,len)); },
         wasm_trap: () => { throw new Error(); },
         wasm_write_to_console: (str, len) => { console.log(mem.read_cstr(str, len)); },
-        wasm_get_milliseconds: () => { return performance.now(); },
 
         // gfx
         wasm_draw_text: (str, len, x, y, font_str, font_len, font_size, r, g, b, a) => {
@@ -125,37 +184,59 @@ const mem = new memory_t(new WebAssembly['Memory']({ initial: 2000, maximum: 655
 
     };
 
-    const program = await WebAssembly['instantiate'](binary, { "env": wasm_imports });
+    Object.assign(wasm_app_imports, wasm_os_imports);
+
+    const program = await WebAssembly['instantiate'](binary, { "env": wasm_app_imports });
     const instance = program['instance'];
     const wasm_exports = instance['exports'];
     mem.exports = wasm_exports;
     wasm_exports['wasm_init']();
 
-    addEventListener("keydown", (event) => {
-        wasm_exports["wasm_key_down"](mem.write_string("wasm_temp_buff1", event.key), event.ctrlKey, event.shiftKey, event.altKey, event.metaKey);
-    });
-    addEventListener("keyup", (event) => {
-        wasm_exports["wasm_key_up"](mem.write_string("wasm_temp_buff1", event.key), event.ctrlKey, event.shiftKey, event.altKey, event.metaKey);
-    });
-    addEventListener("mousemove", (event) => {
-        wasm_exports["wasm_mouse_move"](event.clientX, event.clientY, event.ctrlKey, event.shiftKey, event.altKey, event.metaKey);
-    });
-    addEventListener("mousedown", (event) => {
-        wasm_exports["wasm_mouse_down"](event.clientX, event.clientY, event.button, event.ctrlKey, event.shiftKey, event.altKey, event.metaKey);
-    });
-    addEventListener("mouseup", (event) => {
-        wasm_exports["wasm_mouse_up"](event.clientX, event.clientY, event.button, event.ctrlKey, event.shiftKey, event.altKey, event.metaKey);
-    });
-    addEventListener("wheel", (event) => {
-        wasm_exports["wasm_mouse_wheel"](event.clientX, event.clientY, event.deltaX, event.deltaY, event.deltaZ, event.ctrlKey, event.shiftKey, event.altKey, event.metaKey);
-    });
+    let awake = false;
 
-    requestAnimationFrame(function update(time) {
+    function wasm_update(time) {
         const dpr = window.devicePixelRatio;
         canvas.width = canvas.getBoundingClientRect().width * dpr;
         canvas.height = canvas.getBoundingClientRect().height * dpr;
-        wasm_exports['wasm_update'](canvas.width, canvas.height, dpr);
-        requestAnimationFrame(update);
+        let animating = wasm_exports['wasm_update'](time, canvas.width, canvas.height, dpr);
+        if (animating) {
+            requestAnimationFrame(wasm_update);
+        } else {
+            awake = false;
+        }
+    }
+
+    function wake_up() {
+        if (awake) return;
+        awake = true;
+        window.requestAnimationFrame(wasm_update);
+    }
+
+    addEventListener("keydown", (event) => {
+        wasm_exports["wasm_key_down"](mem.write_string_to_cglobal("wasm_temp_buff1", event.key), event.ctrlKey, event.shiftKey, event.altKey, event.metaKey);
+        wake_up();
     });
+    addEventListener("keyup", (event) => {
+        wasm_exports["wasm_key_up"](mem.write_string_to_cglobal("wasm_temp_buff1", event.key), event.ctrlKey, event.shiftKey, event.altKey, event.metaKey);
+        wake_up();
+    });
+    addEventListener("mousemove", (event) => {
+        wasm_exports["wasm_mouse_move"](event.clientX, event.clientY, event.ctrlKey, event.shiftKey, event.altKey, event.metaKey);
+        wake_up();
+    });
+    addEventListener("mousedown", (event) => {
+        wasm_exports["wasm_mouse_down"](event.clientX, event.clientY, event.button, event.ctrlKey, event.shiftKey, event.altKey, event.metaKey);
+        wake_up();
+    });
+    addEventListener("mouseup", (event) => {
+        wasm_exports["wasm_mouse_up"](event.clientX, event.clientY, event.button, event.ctrlKey, event.shiftKey, event.altKey, event.metaKey);
+        wake_up();
+    });
+    addEventListener("wheel", (event) => {
+        wasm_exports["wasm_mouse_wheel"](event.clientX, event.clientY, event.deltaX, event.deltaY, event.deltaZ, event.ctrlKey, event.shiftKey, event.altKey, event.metaKey);
+        wake_up();
+    });
+
+    requestAnimationFrame(wasm_update);
 })()
 </script>
\ No newline at end of file
diff --git a/src/app/app_wasm.c b/src/app/app_wasm.c
index 8c68f34..2bdd40f 100644
--- a/src/app/app_wasm.c
+++ b/src/app/app_wasm.c
@@ -36,8 +36,6 @@ while (true) {
 }
 
 */
-fn_wasm_import f64  wasm_get_milliseconds(void);
-
 gb_wasm_export char wasm_temp_buff1[128] = {[127] = 0x13};
 gb_wasm_export i32  wasm_temp_buff1_len  = 127;
 gb_wasm_export char wasm_temp_buff2[128] = {[127] = 0x13};
@@ -47,7 +45,6 @@ gb f64                    wasm_dpr;
 gb f64                    wasm_delta_time;
 gb f64                    wasm_time;
 gb f64                    wasm_last_time;
-gb f64                    wasm_app_init_time;
 gb app_event_list_t       wasm_event_list;
 
 typedef struct wasm_cached_t wasm_cached_t;
@@ -56,7 +53,7 @@ struct wasm_cached_t {
     b8 ctrl, alt, meta, shift;
 } wasm_cached;
 
-fn void app_update(app_event_list_t eventswasm_event_list);
+fn b32  app_update(app_event_list_t);
 fn void app_init(void);
 
 fn void wasm_add_event(app_event_t event) {
@@ -179,12 +176,8 @@ fn_wasm_export void wasm_key_up(char *key, b32 ctrl, b32 shift, b32 alt, b32 met
     }
 }
 
-fn f64 wasm_seconds_now(void) {
-    return wasm_get_milliseconds() / 1000.0;
-}
-
-fn_wasm_export void wasm_update(f64 width, f64 height, f64 dpr) {
-    wasm_time = wasm_seconds_now();
+fn_wasm_export void wasm_update(f64 time, f64 width, f64 height, f64 dpr) {
+    wasm_time = time;
     wasm_delta_time = wasm_time - wasm_last_time;
 
     v2f64_t window_size = (v2f64_t){width / dpr, height / dpr};
@@ -216,13 +209,12 @@ fn_wasm_export void wasm_update(f64 width, f64 height, f64 dpr) {
 fn_wasm_export void wasm_init(void) {
     core_init();
     app_init();
-    wasm_app_init_time = wasm_seconds_now();
 }
 
 fn f64 app_get_anim_time(void) {
-    return wasm_time;
+    return wasm_time / 1000.0;
 }
 
 fn f64 app_get_anim_delta_time(void) {
-    return wasm_delta_time;
+    return wasm_delta_time / 1000.0;
 }
\ No newline at end of file
diff --git a/src/app/app_wasm.html b/src/app/app_wasm.html
index ada7752..5bc2f8c 100644
--- a/src/app/app_wasm.html
+++ b/src/app/app_wasm.html
@@ -33,6 +33,33 @@
 </html>
 <script>
 
+class stream_t {
+    constructor(dataview, ptr, len) {
+        this.dv = dataview;
+        this.ptr = ptr;
+        this.len = len;
+        this.i = 0;
+    }
+
+    write_u32(value) {
+        if (this.i + 4 <= this.len) {
+            this.dv.setUint32(this.ptr + this.i, value, true);
+            this.i += 4;
+        } else {
+            console.log("reached end of buffer while stream writing");
+        }
+    }
+
+    write_u16(value) {
+        if (this.i + 2 <= this.len) {
+            this.dv.setUint16(this.ptr + this.i, value, true);
+            this.i += 2;
+        } else {
+            console.log("reached end of buffer while stream writing");
+        }
+    }
+}
+
 class memory_t {
     exports = null; // this is set after wasm module created
     constructor(wasm_memory) {
@@ -58,12 +85,16 @@ class memory_t {
         this.u8[ptr + i] = 0;
     }
 
-    write_string(temp, string) {
+    write_string_to_cglobal(temp, string) {
         const ptr = this.exports[temp].value;
         const len = this.data_view.getInt32(this.exports[temp + "_len"].value, true);
         this.write_string_into_cmemory(ptr, len, string);
         return ptr;
     }
+
+    stream_write(ptr, len) {
+        return new stream_t(this.data_view, ptr, len);
+    }
 }
 
 const canvas = document.getElementById("canvas");
@@ -78,7 +109,36 @@ const mem = new memory_t(new WebAssembly['Memory']({ initial: 2000, maximum: 655
 
     const request = await fetch('main.wasm');
     const binary = await request.arrayBuffer();
-    const wasm_imports = {
+
+    const wasm_os_imports = {
+        wasm_local_time_now: (ptr, len) => {
+            const date = new Date();
+            const stream = mem.stream_write(ptr, len);
+            stream.write_u16(date.getMilliseconds());
+            stream.write_u16(date.getSeconds());
+            stream.write_u16(date.getMinutes());
+            stream.write_u16(date.getHours());
+            stream.write_u16(date.getDate());
+            stream.write_u16(date.getMonth());
+            stream.write_u16(date.getFullYear());
+        },
+
+        wasm_universal_time_now: (ptr, len) => {
+            const date = new Date();
+            const stream = mem.stream_write(ptr, len);
+            stream.write_u16(date.getUTCMilliseconds());
+            stream.write_u16(date.getUTCSeconds());
+            stream.write_u16(date.getUTCMinutes());
+            stream.write_u16(date.getUTCHours());
+            stream.write_u16(date.getUTCDate());
+            stream.write_u16(date.getUTCMonth());
+            stream.write_u16(date.getUTCFullYear());
+        },
+
+        wasm_milliseconds_now: () => { return performance.now(); },
+    };
+
+    let wasm_app_imports = {
 
         // core
         memory: mem.mem,
@@ -86,7 +146,6 @@ const mem = new memory_t(new WebAssembly['Memory']({ initial: 2000, maximum: 655
         wasm_alert: (str, len) => { alert(mem.read_cstr(str,len)); },
         wasm_trap: () => { throw new Error(); },
         wasm_write_to_console: (str, len) => { console.log(mem.read_cstr(str, len)); },
-        wasm_get_milliseconds: () => { return performance.now(); },
 
         // gfx
         wasm_draw_text: (str, len, x, y, font_str, font_len, font_size, r, g, b, a) => {
@@ -125,37 +184,59 @@ const mem = new memory_t(new WebAssembly['Memory']({ initial: 2000, maximum: 655
 
     };
 
-    const program = await WebAssembly['instantiate'](binary, { "env": wasm_imports });
+    Object.assign(wasm_app_imports, wasm_os_imports);
+
+    const program = await WebAssembly['instantiate'](binary, { "env": wasm_app_imports });
     const instance = program['instance'];
     const wasm_exports = instance['exports'];
     mem.exports = wasm_exports;
     wasm_exports['wasm_init']();
 
-    addEventListener("keydown", (event) => {
-        wasm_exports["wasm_key_down"](mem.write_string("wasm_temp_buff1", event.key), event.ctrlKey, event.shiftKey, event.altKey, event.metaKey);
-    });
-    addEventListener("keyup", (event) => {
-        wasm_exports["wasm_key_up"](mem.write_string("wasm_temp_buff1", event.key), event.ctrlKey, event.shiftKey, event.altKey, event.metaKey);
-    });
-    addEventListener("mousemove", (event) => {
-        wasm_exports["wasm_mouse_move"](event.clientX, event.clientY, event.ctrlKey, event.shiftKey, event.altKey, event.metaKey);
-    });
-    addEventListener("mousedown", (event) => {
-        wasm_exports["wasm_mouse_down"](event.clientX, event.clientY, event.button, event.ctrlKey, event.shiftKey, event.altKey, event.metaKey);
-    });
-    addEventListener("mouseup", (event) => {
-        wasm_exports["wasm_mouse_up"](event.clientX, event.clientY, event.button, event.ctrlKey, event.shiftKey, event.altKey, event.metaKey);
-    });
-    addEventListener("wheel", (event) => {
-        wasm_exports["wasm_mouse_wheel"](event.clientX, event.clientY, event.deltaX, event.deltaY, event.deltaZ, event.ctrlKey, event.shiftKey, event.altKey, event.metaKey);
-    });
+    let awake = false;
 
-    requestAnimationFrame(function update(time) {
+    function wasm_update(time) {
         const dpr = window.devicePixelRatio;
         canvas.width = canvas.getBoundingClientRect().width * dpr;
         canvas.height = canvas.getBoundingClientRect().height * dpr;
-        wasm_exports['wasm_update'](canvas.width, canvas.height, dpr);
-        requestAnimationFrame(update);
+        let animating = wasm_exports['wasm_update'](time, canvas.width, canvas.height, dpr);
+        if (animating) {
+            requestAnimationFrame(wasm_update);
+        } else {
+            awake = false;
+        }
+    }
+
+    function wake_up() {
+        if (awake) return;
+        awake = true;
+        window.requestAnimationFrame(wasm_update);
+    }
+
+    addEventListener("keydown", (event) => {
+        wasm_exports["wasm_key_down"](mem.write_string_to_cglobal("wasm_temp_buff1", event.key), event.ctrlKey, event.shiftKey, event.altKey, event.metaKey);
+        wake_up();
     });
+    addEventListener("keyup", (event) => {
+        wasm_exports["wasm_key_up"](mem.write_string_to_cglobal("wasm_temp_buff1", event.key), event.ctrlKey, event.shiftKey, event.altKey, event.metaKey);
+        wake_up();
+    });
+    addEventListener("mousemove", (event) => {
+        wasm_exports["wasm_mouse_move"](event.clientX, event.clientY, event.ctrlKey, event.shiftKey, event.altKey, event.metaKey);
+        wake_up();
+    });
+    addEventListener("mousedown", (event) => {
+        wasm_exports["wasm_mouse_down"](event.clientX, event.clientY, event.button, event.ctrlKey, event.shiftKey, event.altKey, event.metaKey);
+        wake_up();
+    });
+    addEventListener("mouseup", (event) => {
+        wasm_exports["wasm_mouse_up"](event.clientX, event.clientY, event.button, event.ctrlKey, event.shiftKey, event.altKey, event.metaKey);
+        wake_up();
+    });
+    addEventListener("wheel", (event) => {
+        wasm_exports["wasm_mouse_wheel"](event.clientX, event.clientY, event.deltaX, event.deltaY, event.deltaZ, event.ctrlKey, event.shiftKey, event.altKey, event.metaKey);
+        wake_up();
+    });
+
+    requestAnimationFrame(wasm_update);
 })()
 </script>
\ No newline at end of file
diff --git a/src/app/app_win32.c b/src/app/app_win32.c
index c2cc44a..5778442 100644
--- a/src/app/app_win32.c
+++ b/src/app/app_win32.c
@@ -10,7 +10,6 @@
 #pragma comment(lib, "user32.lib")
 #pragma comment(lib, "winmm.lib")
 
-
 gb b32       w32_good_scheduling;
 gb WNDCLASSW w32_wc;
 gb HWND      w32_window_handle;
@@ -43,6 +42,7 @@ fn f64 w32_get_dpr(HWND window_handle) {
 
 ///////////////////////////////
 // event processing
+
 gb app_event_list_t w32_event_list;
 gb ma_arena_t      *w32_event_arena;
 
diff --git a/src/core/core_string.h b/src/core/core_string.h
index a549fbe..ee84f4a 100644
--- a/src/core/core_string.h
+++ b/src/core/core_string.h
@@ -132,6 +132,24 @@ fn void    sb8_indent(sb8_t *sb);
 fn s8_t    sb8_stmtf(sb8_t *sb, const char *str, ...);
 fn int64_t sb8_char_size(sb8_t *sb);
 
+#if 0
+sb8_t *sbin_write_begin(ma_arena_t *arena);
+s8_t   sbin_write_end(sb8_t *sb);
+
+void  *sbin_write_data(sb8_t *sb, void *p, i64 size);
+void  *sbin_write_size(sb8_t *sb, i64 size);
+void  *sbin_write_u64(sb8_t *sb, u64 value);
+void  *sbin_write_u32(sb8_t *sb, u32 value);
+void  *sbin_write_u16(sb8_t *sb, u16 value);
+void  *sbin_write_u8(sb8_t *sb,  u8  value);
+s8_t  *sbin_write_s8(sb8_t *sb, s8_t string);
+char  *sbin_write_str(sb8_t *sb, char *string);
+
+stream_t sbin_read_begin(void *p, i64 size);
+void     sbin_read_end(stream_t *stream);
+void    *sbin_read_data(stream_t *stream, i64 size);
+#endif
+
 //
 // other
 #define s8_fmtspec(string) (int)(string).len, (string).str
diff --git a/src/os/os.c b/src/os/os.c
index e69de29..13e6817 100644
--- a/src/os/os.c
+++ b/src/os/os.c
@@ -0,0 +1,7 @@
+#if PLATFORM_WASM
+#include "os_wasm.c"
+#elif PLATFORM_WINDOWS
+#include "os_win32.c"
+#else
+#include "os_unix.c"
+#endif
\ No newline at end of file
diff --git a/src/os/os.h b/src/os/os.h
index 5df63f3..1a5a2d9 100644
--- a/src/os/os.h
+++ b/src/os/os.h
@@ -9,4 +9,42 @@ struct os_date_t {
     u16 year;
 };
 
-fn os_date_t os_date_now(void);
+fn os_date_t os_local_time_now(void);
+fn os_date_t os_universal_time_now(void);
+fn f64       os_milliseconds_now(void);
+
+#if 0
+fn u64            os_microseconds_now();
+fn f64            os_seconds_now();
+fn u32            os_unix_time_now();
+
+fn os_date_t      os_local_time_to_universal_time();
+fn os_date_t      os_universal_time_to_local_time();
+
+fn void           os_sleep_milliseconds();
+
+
+fn s8_t           os_list_files(arena, path, recursive);
+fn os_file_iter_t os_iterate_files();
+fn void           os_advance()
+fn b32            os_is_valid();
+
+fn s8_t           os_read_file(ma_arena_t *arena, s8_t path);
+fn void           os_write_file(s8_t path, s8_t content);
+fn void           os_make_dir(s8_t path);
+fn os_result_t    os_copy_file(s8_t from, s8_t to, b32 overwrite);
+fn os_result_t    os_delete_file(s8_t path);
+fn i64            os_get_file_mod_time(s8_t path);
+
+fn b32            os_path_exists(s8_t path);
+fn b32            os_path_is_dir(s8_t path);
+fn b32            os_path_is_file(s8_t path);
+fn b32            os_path_is_abs(s8_t path);
+fn b32            os_path_is_rel(s8_t path);
+fn s8_t           os_path_to_abs(ma_arena_t *arena, s8_t path);
+
+fn s8_t           os_path_exe(ma_arena_t *arena);
+fn s8_t           os_path_exe_dir(ma_arena_t *arena);
+fn s8_t           os_path_cwd(ma_arena_t *arena);
+fn void           os_path_set_cwd(s8_t path);
+#endif
\ No newline at end of file
diff --git a/src/os/os_unix.c b/src/os/os_unix.c
index 529f381..be25369 100644
--- a/src/os/os_unix.c
+++ b/src/os/os_unix.c
@@ -1,4 +1,4 @@
-fn os_date_t os_date_now(void) {
+fn os_date_t os_local_time_now(void) {
     os_date_t result = {0};
     time_t time = time(NULL);
     struct tm *lt = localtime(&time);
diff --git a/src/os/os_wasm.c b/src/os/os_wasm.c
index 13956fe..3ac34a8 100644
--- a/src/os/os_wasm.c
+++ b/src/os/os_wasm.c
@@ -1,4 +1,20 @@
-fn os_date_t os_date_now(void) {
-    os_date_t result = {0}; // don't need timed logs in browser
+fn_wasm_import void wasm_local_time_now(void *buff, i32 size);
+fn_wasm_import void wasm_universal_time_now(void *buff, i32 size);
+fn_wasm_import f64  wasm_milliseconds_now(void);
+
+fn os_date_t os_local_time_now(void) {
+    os_date_t result = {0};
+    wasm_local_time_now(&result, sizeof(result));
     return result;
 }
+
+fn os_date_t os_universal_time_now(void) {
+    os_date_t result = {0};
+    wasm_universal_time_now(&result, sizeof(result));
+    return result;
+}
+
+fn f64 os_milliseconds_now(void) {
+    return wasm_milliseconds_now();
+}
+
diff --git a/src/os/os_win32.c b/src/os/os_win32.c
index c5e79d6..15782a2 100644
--- a/src/os/os_win32.c
+++ b/src/os/os_win32.c
@@ -1,4 +1,4 @@
-fn os_date_t os_date_now(void) {
+fn os_date_t os_local_time_now(void) {
     os_date_t result = {0};
     SYSTEMTIME lt;
     GetLocalTime(&lt);
diff --git a/src/wasm_app/main.c b/src/wasm_app/main.c
index 60ffbb6..0dd9858 100644
--- a/src/wasm_app/main.c
+++ b/src/wasm_app/main.c
@@ -1,8 +1,12 @@
 #include "core/core_inc.h"
-#include "core/core_inc.c"
 #include "app/app.h"
+#include "os/os.h"
+
+#include "core/core_inc.c"
 #include "app/app.c"
+#include "os/os.c"
 #include "gfx2d/gfx2d.c"
+
 // #include "ui.c"
 
 gfx_t *gfx = NULL;
@@ -10,9 +14,14 @@ gfx_t *gfx = NULL;
 void app_init(void) {
     ma_arena_t *perm = &tcx._perm;
     gfx = ma_push_type(perm, gfx_t);
+
+    os_date_t ldate = os_local_time_now();
+    os_date_t udate = os_universal_time_now();
+
+    assert(ldate.hour == (udate.hour + 1));
 }
 
-void app_update(app_event_list_t events) {
+b32 app_update(app_event_list_t events) {
     for (app_event_t *ev = events.first; ev; ev = ev->next) {
         // update
     }
@@ -31,4 +40,5 @@ void app_update(app_event_list_t events) {
         gfx_end(gfx);
     }
 
+    return false;
 }
diff --git a/todo.txt b/todo.txt
index 6bfb012..2eed321 100644
--- a/todo.txt
+++ b/todo.txt
@@ -20,23 +20,10 @@
             [ ] change name, hard to type
 
 [ ] core
-    [ ] remove dates and time from core
+    [x] remove dates and time from core
     [ ] meta
         [x] search for python snippets and execute meta.py script on that file
         [ ] new simple format with tags
     [x] revisit api
     [ ] s8_bin
-        [ ] bin_write_begin - serialize binary data (sb8_bin_write?)
-            bin_write_end
-            bin_write_u64
-            bin_write_u32
-            bin_write_u16
-            bin_write_u8
-            bin_write_data
-            bin_write_size
-            bin_write_s8
-            bin_write_cs
-        [ ] bin_read_begin
-            bin_read_end
-            bin_read_...