From 917f5beee05a994852949b880ea47d7fab6f8cca Mon Sep 17 00:00:00 2001
From: Mitya Selivanov <automainint@guattari.tech>
Date: Wed, 8 Jan 2025 02:18:43 +0100
Subject: Impl clipboard

---
 examples/ui.c          |  6 ++--
 index.htm              | 73 ++++++++++++++++++++++++++++++++----------
 reduced_system_layer.c | 86 ++++++++++++++++++++++++++++++++++++--------------
 3 files changed, 122 insertions(+), 43 deletions(-)

diff --git a/examples/ui.c b/examples/ui.c
index d595617..79bdd70 100755
--- a/examples/ui.c
+++ b/examples/ui.c
@@ -87,7 +87,7 @@ void update_and_render_frame(void) {
   for (i64 i = 0; i < platform.input_size; ++i)
     if (platform.input[i].ctrl)
       switch (platform.input[i].key) {
-        case 'v': {
+        case KEY_V: {
           if (selection != 0) {
             i64 i0 = selection < 0 ? cursor + selection : cursor;
             i64 i1 = selection < 0 ? cursor : cursor + selection;
@@ -112,7 +112,7 @@ void update_and_render_frame(void) {
           }
         } break;
 
-        case 'x': {
+        case KEY_X: {
           i64       len = 0;
           static c8 buf[1024];
 
@@ -131,7 +131,7 @@ void update_and_render_frame(void) {
           text_len -= i1 - i0;
         } break;
 
-        case 'c': {
+        case KEY_C: {
           i64       len = 0;
           static c8 buf[1024];
 
diff --git a/index.htm b/index.htm
index 33d6c2d..b529d83 100644
--- a/index.htm
+++ b/index.htm
@@ -10,8 +10,8 @@
     <canvas style="margin: 0; width: 100%; height: 100%;" id="frame" oncontextmenu="event.preventDefault()"></canvas>
     <script type="worklet">
       registerProcessor(
-        'Sound_Node',
-        class Sound_Ring extends AudioWorkletProcessor {
+        "Sound_Node",
+        class Sound_Node extends AudioWorkletProcessor {
           constructor(options) {
             super();
 
@@ -33,7 +33,7 @@
                       fd_seek        : () => { throw new Error("Unexpected fd_seek call"); },
                     },
                     env : {
-                      p_clipboard_write : (size, text) => {
+                      p_clipboard_write_impl : (size, text) => {
                         let text_buffer = new ArrayBuffer(size);
                         new Uint8Array(text_buffer).set(new Uint8Array(this.memory_buffer, text, size));
 
@@ -116,7 +116,7 @@
                 if (this.program === undefined)
                   return;
 
-                this.program.exports.js_keydown(ev.key, ev.mod);
+                this.program.exports.js_keydown(ev.key, ev.mod, ev.ch);
               },
 
               keyup : (ev) => {
@@ -125,6 +125,18 @@
 
                 this.program.exports.js_keyup(ev.key, ev.mod);
               },
+
+              paste : (ev) => {
+                if (this.program === undefined)
+                  return;
+
+                let address = this.program.exports.js_clipboard_buffer(ev.bytes.length);
+                let len     = this.program.exports.js_clipboard_size();
+
+                new Uint8Array(this.memory_buffer, address, len).set(ev.bytes.subarray(0, len));
+
+                this.program.exports.js_keydown(ev.key, ev.mod, ev.ch);
+              },
             };
 
             this.port.onmessage = (ev) => {
@@ -162,6 +174,8 @@
       );
     </script>
     <script type="text/javascript">
+      const KEY_PASTE = 118;
+
       let key_map = {
         "Backspace"    : 8,
         "Tab"          : 9,
@@ -229,7 +243,7 @@
         "KeyS"         : 115,
         "KeyT"         : 116,
         "KeyU"         : 117,
-        "KeyV"         : 118,
+        "KeyV"         : KEY_PASTE,
         "KeyW"         : 119,
         "KeyX"         : 120,
         "KeyY"         : 121,
@@ -276,6 +290,12 @@
         return mod;
       };
 
+      function char_from_event(ev) {
+        if (ev.key.length != 1)
+          return 0;
+        return ev.key.charCodeAt(0);
+      }
+
       async function run(attrs) {
         let sound_sample_rate  = 44100; // TODO
         let sound_num_channels = 2;     // TODO
@@ -293,6 +313,9 @@
         let sound_context;
         let sound_node;
 
+        let paste_mod = 0;
+        let paste_ch  = 0;
+
         canvas  = attrs.canvas;
         context = canvas.getContext("2d");
 
@@ -378,7 +401,6 @@
 
             frame : (ev) => {
               pixels_buffer = ev.pixels_buffer;
-              let pixels = new Uint8Array(pixels_buffer);
             }
           };
 
@@ -428,23 +450,26 @@
         });
 
         window.addEventListener("keydown", (ev) => {
-          ev.preventDefault();
           if (!sound_ready)
             return;
           if (ev.repeat)
             return;
-          let mod = mod_from_event(ev);
           let key = key_from_code(ev.code);
           if (key == 0)
             return;
+          let mod = mod_from_event(ev);
+          let ch  = char_from_event(ev);
 
-          console.log(ev);
-
-          sound_node.port.postMessage({
-            id  : "keydown",
-            mod : mod,
-            key : key,
-          });
+          if (ev.ctrlKey && key == KEY_PASTE) {
+            paste_mod = mod;
+            paste_ch  = ch;
+          } else
+            sound_node.port.postMessage({
+              id  : "keydown",
+              mod : mod,
+              key : key,
+              ch  : ch,
+            });
         });
 
         window.addEventListener("keyup", (ev) => {
@@ -453,15 +478,29 @@
             return;
           if (ev.repeat)
             return;
-          let mod = mod_from_event(ev);
           let key = key_from_code(ev.code);
           if (key == 0)
             return;
+          let mod = mod_from_event(ev);
 
           sound_node.port.postMessage({
             id  : "keyup",
-            mod : mod,
             key : key,
+            mod : mod,
+          });
+        });
+
+        window.addEventListener("paste", (ev) => {
+          ev.preventDefault();
+          if (!sound_ready)
+            return;
+
+          sound_node.port.postMessage({
+            id    : "paste",
+            bytes : new TextEncoder("utf-8").encode(ev.clipboardData.getData("text")),
+            mod   : paste_mod,
+            key   : KEY_PASTE,
+            ch    : paste_ch,
           });
         });
       }
diff --git a/reduced_system_layer.c b/reduced_system_layer.c
index 30fb48b..87778cd 100755
--- a/reduced_system_layer.c
+++ b/reduced_system_layer.c
@@ -1565,16 +1565,17 @@ void p_clipboard_write(i64 size, c8 *data) {
 
 #ifdef __wasm__
 
-static u32       _buffer[MAX_NUM_PIXELS]             = {0};
-static Input_Key _input[MAX_INPUT_SIZE]              = {0};
-static i32       _num_events                         = 0;
-static i32       _input_size                         = 0;
-static b8        _key_pressed[MAX_NUM_KEYS]          = {0};
-static b8        _wait_events                        = 0;
-i64              _sound_position                     = 0;
-i64              _sound_read                         = 0;
-f32              _sound_ring[MAX_NUM_AUDIO_FRAMES]   = {0};
-f32              _sound_buffer[MAX_NUM_AUDIO_FRAMES] = {0};
+static u32       _buffer[MAX_NUM_PIXELS]               = {0};
+static Input_Key _input[MAX_INPUT_SIZE]                = {0};
+static c8        _clipboard_buffer[MAX_CLIPBOARD_SIZE] = {0};
+static i32       _num_events                           = 0;
+static i32       _input_size                           = 0;
+static b8        _key_pressed[MAX_NUM_KEYS]            = {0};
+static b8        _wait_events                          = 0;
+i64              _sound_position                       = 0;
+i64              _sound_read                           = 0;
+f32              _sound_ring[MAX_NUM_AUDIO_FRAMES]     = {0};
+f32              _sound_buffer[MAX_NUM_AUDIO_FRAMES]   = {0};
 
 i32 p_time_impl(void);
 
@@ -1588,11 +1589,12 @@ void p_sleep_for(i64 duration) {
 
 void p_init(void) {
   ++_num_events;
-  platform.pixels = _buffer;
-  platform.input  = _input;
-  platform.done   = 1;
-  _sound_position = AUDIO_AVAIL_MIN % MAX_NUM_AUDIO_FRAMES;
-  _sound_read     = 0;
+  platform.pixels    = _buffer;
+  platform.input     = _input;
+  platform.clipboard = _clipboard_buffer;
+  platform.done      = 1;
+  _sound_position    = AUDIO_AVAIL_MIN % MAX_NUM_AUDIO_FRAMES;
+  _sound_read        = 0;
 }
 
 i32 p_handle_events(void) {
@@ -1615,6 +1617,21 @@ i32 p_wait_events(void) {
 
 void p_render_frame(void) { }
 
+void p_clipboard_write_impl(i32 size, c8 *data);
+
+void p_clipboard_write(i64 size, c8 *data) {
+  if (size < 0 || data == NULL)
+    return;
+  if (size > MAX_CLIPBOARD_SIZE)
+    size = MAX_CLIPBOARD_SIZE;
+
+  platform.clipboard_size = size;
+  for (i64 i = 0; i < size; ++i)
+    platform.clipboard[i] = data[i];
+
+  p_clipboard_write_impl((i32) size, data);
+}
+
 void p_handle_audio(i64 samples_elapsed) {
   if (samples_elapsed <= 0)
     return;
@@ -1722,22 +1739,32 @@ __attribute__((export_name("js_mouseup"))) void js_mouseup(u32 buttons) {
   if (!(buttons & 4)) platform.key_down[BUTTON_MIDDLE] = 0;
 }
 
-__attribute__((export_name("js_keydown"))) void js_keydown(u32 key, u32 mod) {
-  //  TODO
+__attribute__((export_name("js_keydown"))) void js_keydown(u32 key, u32 mod, u32 ch) {
   ++_num_events;
-  _key_pressed[key]      = 1;
-  platform.key_down[key] = 1;
+  _key_pressed[key]            = 1;
+  platform.key_down[key]       = 1;
+  platform.key_down[MOD_CTRL]  = (mod & 1) ? 1 : 0;
+  platform.key_down[MOD_SHIFT] = (mod & 2) ? 1 : 0;
+  platform.key_down[MOD_ALT]   = (mod & 4) ? 1 : 0;
+  platform.key_down[MOD_META]  = (mod & 8) ? 1 : 0;
   if (platform.input_size < MAX_INPUT_SIZE)
     platform.input[_input_size++] = (Input_Key) {
-      .key = key,
-      .c   = key,
+      .ctrl  = (mod & 1) ? 1 : 0,
+      .shift = (mod & 2) ? 1 : 0,
+      .alt   = (mod & 4) ? 1 : 0,
+      .meta  = (mod & 8) ? 1 : 0,
+      .key   = key,
+      .c     = ch,
     };
 }
 
 __attribute__((export_name("js_keyup"))) void js_keyup(u32 key, u32 mod) {
-  //  TODO
   ++_num_events;
-  platform.key_down[key] = 0;
+  platform.key_down[key]       = 0;
+  platform.key_down[MOD_CTRL]  = (mod & 1) ? 1 : 0;
+  platform.key_down[MOD_SHIFT] = (mod & 2) ? 1 : 0;
+  platform.key_down[MOD_ALT]   = (mod & 4) ? 1 : 0;
+  platform.key_down[MOD_META]  = (mod & 8) ? 1 : 0;
 }
 
 __attribute__((export_name("js_sample_rate"))) f64 js_sample_rate(void) {
@@ -1756,6 +1783,19 @@ __attribute__((export_name("js_sound_buffer"))) void *js_sound_buffer(void) {
   return _sound_buffer;
 }
 
+__attribute__((export_name("js_clipboard_size"))) i32 js_clipboard_size(void) {
+  return platform.clipboard_size;
+}
+
+__attribute__((export_name("js_clipboard_buffer"))) void *js_clipboard_buffer(i32 len) {
+  if (len < 0)
+    len = 0;
+  if (len > MAX_CLIPBOARD_SIZE)
+    len = MAX_CLIPBOARD_SIZE;
+  platform.clipboard_size = len;
+  return platform.clipboard;
+}
+
 #endif // __wasm__
 
 //  ================================================================
-- 
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