[client] overlay: add modal message dialog support

client/CMakeLists.txt

@@ -139,6 +139,7 @@ set(SOURCES
 	src/overlay/graphs.c
 	src/overlay/help.c
 	src/overlay/config.c
+	src/overlay/msg.c
 )
 
 # Force cimgui to build as a static library.

client/include/app.h

@@ -134,6 +134,8 @@ void app_clipboardRequest(const LG_ClipboardReplyFn replyFn, void * opaque);
  */
 void app_alert(LG_MsgAlert type, const char * fmt, ...);
 
+void app_msgBox(const char * caption, const char * fmt, ...);
+
 typedef struct KeybindHandle * KeybindHandle;
 typedef void (*KeybindFn)(int sc, void * opaque);
 

client/include/interface/overlay.h

@@ -43,6 +43,10 @@ struct LG_OverlayOps
    * optional, if omitted assumes false */
   bool (*needs_render)(void * udata, bool interactive);
 
+  /* return true if the overlay currently requires overlay mode
+   * optional, if omitted assumes false */
+  bool (*needs_overlay)(void * udata);
+
   /* perform the actual drawing/rendering
    *
    * `interactive` is true if the application is currently in overlay interaction

client/src/app.c

@@ -63,7 +63,18 @@ bool app_isFormatValid(void)
 
 bool app_isOverlayMode(void)
 {
-  return g_state.overlayInput;
+  if (g_state.overlayInput)
+    return true;
+
+  struct Overlay * overlay;
+  for (ll_reset(g_state.overlays);
+      ll_walk(g_state.overlays, (void **)&overlay); )
+  {
+    if (overlay->ops->needs_overlay && overlay->ops->needs_overlay(overlay))
+      return true;
+  }
+
+  return false;
 }
 
 void app_updateCursorPos(double x, double y)
@@ -72,7 +83,7 @@ void app_updateCursorPos(double x, double y)
   g_cursor.pos.y = y;
   g_cursor.valid = true;
 
-  if (g_state.overlayInput)
+  if (app_isOverlayMode())
     g_state.io->MousePos = (ImVec2) { x, y };
 }
 
@@ -81,7 +92,7 @@ void app_handleFocusEvent(bool focused)
   g_state.focused = focused;
 
   // release any imgui buttons/keys if we lost focus
-  if (!focused && g_state.overlayInput)
+  if (!focused && app_isOverlayMode())
     core_resetOverlayInputState();
 
   if (!core_inputEnabled())
@@ -131,7 +142,7 @@ void app_handleEnterEvent(bool entered)
 
     // stop the user being able to drag windows off the screen and work around
     // the mouse button release being missed due to not being in capture mode.
-    if (g_state.overlayInput)
+    if (app_isOverlayMode())
     {
       g_state.io->MouseDown[ImGuiMouseButton_Left  ] = false;
       g_state.io->MouseDown[ImGuiMouseButton_Right ] = false;
@@ -243,7 +254,7 @@ void app_handleButtonPress(int button)
 {
   g_cursor.buttons |= (1U << button);
 
-  if (g_state.overlayInput)
+  if (app_isOverlayMode())
   {
     int igButton = mapSpiceToImGuiButton(button);
     if (igButton != -1)
@@ -262,7 +273,7 @@ void app_handleButtonRelease(int button)
 {
   g_cursor.buttons &= ~(1U << button);
 
-  if (g_state.overlayInput)
+  if (app_isOverlayMode())
   {
     int igButton = mapSpiceToImGuiButton(button);
     if (igButton != -1)
@@ -279,13 +290,13 @@ void app_handleButtonRelease(int button)
 
 void app_handleWheelMotion(double motion)
 {
-  if (g_state.overlayInput)
+  if (app_isOverlayMode())
     g_state.io->MouseWheel -= motion;
 }
 
 void app_handleKeyPress(int sc)
 {
-  if (!g_state.overlayInput || !g_state.io->WantCaptureKeyboard)
+  if (!app_isOverlayMode() || !g_state.io->WantCaptureKeyboard)
   {
     if (sc == g_params.escapeKey && !g_state.escapeActive)
     {
@@ -302,7 +313,7 @@ void app_handleKeyPress(int sc)
     }
   }
 
-  if (g_state.overlayInput)
+  if (app_isOverlayMode())
   {
     if (sc == KEY_ESC)
       app_setOverlay(false);
@@ -339,7 +350,8 @@ void app_handleKeyRelease(int sc)
   {
     if (g_state.escapeAction == -1)
     {
-      if (!g_state.escapeHelp && g_params.useSpiceInput && !g_state.overlayInput)
+      if (!g_state.escapeHelp && g_params.useSpiceInput &&
+          !app_isOverlayMode())
         core_setGrab(!g_cursor.grab);
     }
     else
@@ -356,7 +368,7 @@ void app_handleKeyRelease(int sc)
       g_state.escapeActive = false;
   }
 
-  if (g_state.overlayInput)
+  if (app_isOverlayMode())
   {
     g_state.io->KeysDown[sc] = false;
     return;
@@ -415,7 +427,7 @@ void app_handleKeyboardLEDs(bool numLock, bool capsLock, bool scrollLock)
 void app_handleMouseRelative(double normx, double normy,
     double rawx, double rawy)
 {
-  if (g_state.overlayInput)
+  if (app_isOverlayMode())
     return;
 
   if (g_cursor.grab)
@@ -437,7 +449,8 @@ void app_handleMouseRelative(double normx, double normy,
 void app_handleMouseBasic()
 {
   /* do not pass mouse events to the guest if we do not have focus */
-  if (!g_cursor.guest.valid || !g_state.haveSrcSize || !g_state.focused || g_state.overlayInput)
+  if (!g_cursor.guest.valid || !g_state.haveSrcSize || !g_state.focused ||
+      app_isOverlayMode())
     return;
 
   if (!core_inputEnabled())
@@ -624,6 +637,16 @@ void app_alert(LG_MsgAlert type, const char * fmt, ...)
   va_end(args);
 }
 
+void app_msgBox(const char * caption, const char * fmt, ...)
+{
+  va_list args;
+  va_start(args, fmt);
+  overlayMsg_show(caption, fmt, args);
+  va_end(args);
+
+  core_updateOverlayState();
+}
+
 KeybindHandle app_registerKeybind(int sc, KeybindFn callback, void * opaque, const char * description)
 {
   // don't allow duplicate binds
@@ -746,7 +769,7 @@ bool app_overlayNeedsRender(void)
 {
   struct Overlay * overlay;
 
-  if (g_state.overlayInput)
+  if (app_isOverlayMode())
     return true;
 
   for (ll_reset(g_state.overlays);
@@ -755,7 +778,7 @@ bool app_overlayNeedsRender(void)
     if (!overlay->ops->needs_render)
       continue;
 
-    if (overlay->ops->needs_render(overlay->udata, g_state.overlayInput))
+    if (overlay->ops->needs_render(overlay->udata, false))
       return true;
   }
 
@@ -782,7 +805,8 @@ render_again:
 
   igNewFrame();
 
-  if (g_state.overlayInput)
+  const bool overlayMode = app_isOverlayMode();
+  if (overlayMode)
   {
     totalDamage = true;
     ImDrawList_AddRectFilled(igGetBackgroundDrawList_Nil(), (ImVec2) { 0.0f , 0.0f },
@@ -794,12 +818,17 @@ render_again:
 //    igShowDemoWindow(&test);
   }
 
+  const bool msgModal = overlayMsg_modal();
+
   // render the overlays
   for (ll_reset(g_state.overlays);
       ll_walk(g_state.overlays, (void **)&overlay); )
   {
+    if (msgModal && overlay->ops != &LGOverlayMsg)
+      continue;
+
     const int written =
-      overlay->ops->render(overlay->udata, g_state.overlayInput,
+      overlay->ops->render(overlay->udata, overlayMode,
           buffer, MAX_OVERLAY_RECTS);
 
     for (int i = 0; i < written; ++i)
@@ -836,7 +865,7 @@ render_again:
     overlay->lastRectCount = written;
   }
 
-  if (g_state.overlayInput)
+  if (overlayMode)
   {
     ImGuiMouseCursor cursor = igGetMouseCursor();
     if (cursor != g_state.cursorLast)
@@ -873,32 +902,11 @@ void app_freeOverlays(void)
 
 void app_setOverlay(bool enable)
 {
-  static bool wasGrabbed = false;
-
   if (g_state.overlayInput == enable)
     return;
 
   g_state.overlayInput = enable;
-  g_state.cursorLast   = -2;
-
-  if (g_state.overlayInput)
-  {
-    wasGrabbed = g_cursor.grab;
-
-    g_state.io->ConfigFlags &= ~ImGuiConfigFlags_NoMouse;
-    g_state.io->MousePos = (ImVec2) { g_cursor.pos.x, g_cursor.pos.y };
-
-    core_setGrabQuiet(false);
-    core_setCursorInView(false);
-  }
-  else
-  {
-    g_state.io->ConfigFlags |= ImGuiConfigFlags_NoMouse;
-    core_resetOverlayInputState();
-    core_setGrabQuiet(wasGrabbed);
-    core_invalidatePointer(true);
-    app_invalidateWindow(false);
-  }
+  core_updateOverlayState();
 }
 
 void app_overlayConfigRegister(const char * title,

client/src/core.c

@@ -166,7 +166,7 @@ void core_setGrabQuiet(bool enable)
 bool core_warpPointer(int x, int y, bool exiting)
 {
   if ((!g_cursor.inWindow && !exiting) ||
-      g_state.overlayInput ||
+      app_isOverlayMode() ||
       g_cursor.warpState == WARP_STATE_OFF)
     return false;
 
@@ -376,7 +376,7 @@ void core_handleGuestMouseUpdate(void)
   if (!util_guestCurToLocal(&localPos))
     return;
 
-  if (g_state.overlayInput || !g_cursor.inView)
+  if (app_isOverlayMode() || !g_cursor.inView)
     return;
 
   g_state.ds->guestPointerUpdated(
@@ -624,3 +624,34 @@ void core_resetOverlayInputState(void)
   for(int key = 0; key < ARRAY_LENGTH(g_state.io->KeysDown); key++)
     g_state.io->KeysDown[key] = false;
 }
+
+void core_updateOverlayState(void)
+{
+  static bool lastState = false;
+  bool currentState = app_isOverlayMode();
+  if (lastState == currentState)
+    return;
+
+  lastState          = currentState;
+  g_state.cursorLast = -2;
+
+  static bool wasGrabbed = false;
+  if (app_isOverlayMode())
+  {
+    wasGrabbed = g_cursor.grab;
+
+    g_state.io->ConfigFlags &= ~ImGuiConfigFlags_NoMouse;
+    g_state.io->MousePos = (ImVec2) { g_cursor.pos.x, g_cursor.pos.y };
+
+    core_setGrabQuiet(false);
+    core_setCursorInView(false);
+  }
+  else
+  {
+    g_state.io->ConfigFlags |= ImGuiConfigFlags_NoMouse;
+    core_resetOverlayInputState();
+    core_setGrabQuiet(wasGrabbed);
+    core_invalidatePointer(true);
+    app_invalidateWindow(false);
+  }
+}

client/src/core.h

@@ -40,5 +40,6 @@ void core_handleGuestMouseUpdate(void);
 void core_handleMouseGrabbed(double ex, double ey);
 void core_handleMouseNormal(double ex, double ey);
 void core_resetOverlayInputState(void);
+void core_updateOverlayState(void);
 
 #endif

client/src/main.c

@@ -238,7 +238,7 @@ static int renderThread(void * unused)
       {
         /* only update the time if we woke up early */
         clock_gettime(CLOCK_MONOTONIC, &time);
-        tsAdd(&time, g_state.overlayInput ?
+        tsAdd(&time, app_isOverlayMode() ?
             g_state.overlayFrameTime : g_state.frameTime);
       }
     }
@@ -622,9 +622,10 @@ int main_frameThread(void * unused)
         DEBUG_WARN("Recommend increase size to %d MiB", size);
         DEBUG_BREAK();
 
-        app_alert(LG_ALERT_ERROR,
-          "IVSHMEM too small, screen truncated\n"
-          "Recommend increasing size to %d MiB",
+        app_msgBox(
+          "IVSHMEM too small",
+          "IVSHMEM too small\n"
+          "Please increase the size to %d MiB",
           size);
       }
 
@@ -1512,6 +1513,8 @@ int main(int argc, char * argv[])
   app_registerOverlay(&LGOverlayFPS   , NULL);
   app_registerOverlay(&LGOverlayGraphs, NULL);
   app_registerOverlay(&LGOverlayHelp  , NULL);
+  app_registerOverlay(&LGOverlayMsg   , NULL);
+
 
   // early renderer setup for option registration
   for(unsigned int i = 0; i < LG_RENDERER_COUNT; ++i)

client/src/overlay/msg.c

@@ -0,0 +1,153 @@
+/**
+ * Looking Glass
+ * Copyright © 2017-2022 The Looking Glass Authors
+ * https://looking-glass.io
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "interface/overlay.h"
+#include "cimgui.h"
+#include "overlay_utils.h"
+
+#include "common/stringutils.h"
+#include "common/stringlist.h"
+#include "ll.h"
+
+#include "../main.h"
+
+#include <string.h>
+
+struct Msg
+{
+  char * caption;
+  char * message;
+  StringList lines;
+};
+
+struct MsgState
+{
+  struct ll * messages;
+};
+
+struct MsgState l_msg = { 0 };
+
+static bool msg_init(void ** udata, const void * params)
+{
+  l_msg.messages = ll_new();
+  return true;
+}
+
+static void freeMsg(struct Msg * msg)
+{
+  free(msg->caption);
+  free(msg->message);
+  stringlist_free(&msg->lines);
+  free(msg);
+}
+
+static void msg_free(void * udata)
+{
+  struct Msg * msg;
+  while(ll_shift(l_msg.messages, (void **)&msg))
+    freeMsg(msg);
+  ll_free(l_msg.messages);
+}
+
+static bool msg_needsOverlay(void * udata)
+{
+  return ll_count(l_msg.messages) > 0;
+}
+
+static int msg_render(void * udata, bool interactive, struct Rect * windowRects,
+    int maxRects)
+{
+  struct Msg * msg;
+  if (!ll_peek_head(l_msg.messages, (void **)&msg))
+    return 0;
+
+  ImVec2 * screen = overlayGetScreenSize();
+  igSetNextWindowBgAlpha(0.8f);
+  igSetNextWindowPos((ImVec2) { screen->x * 0.5f, screen->y * 0.5f }, 0,
+    (ImVec2) { 0.5f, 0.5f });
+
+  igBegin(
+    msg->caption,
+    NULL,
+    ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoBringToFrontOnFocus |
+    ImGuiWindowFlags_NoSavedSettings  | ImGuiWindowFlags_NoNav |
+    ImGuiWindowFlags_NoMove           | ImGuiWindowFlags_NoCollapse
+  );
+
+  ImVec2 textSize;
+
+  const int lines = stringlist_count(msg->lines);
+  for(int i = 0; i < lines; ++i)
+  {
+    const char * line = stringlist_at(msg->lines, i);
+    igCalcTextSize(&textSize, line, NULL, false, 0.0);
+    igSetCursorPosX((igGetWindowWidth() * 0.5f) - (textSize.x * 0.5f));
+    igText("%s", stringlist_at(msg->lines, i));
+  }
+
+  igCalcTextSize(&textSize, "OK", NULL, false, 0.0);
+  ImGuiStyle * style = igGetStyle();
+  textSize.x += (style->FramePadding.x * 2.0f) * 8.0f;
+  textSize.y += (style->FramePadding.y * 2.0f) * 1.5f;
+  igSetCursorPosX((igGetWindowWidth() * 0.5f) - (textSize.x * 0.5f));
+
+  if (igButton("OK", textSize))
+  {
+    ll_shift(l_msg.messages, NULL);
+    freeMsg(msg);
+    app_invalidateOverlay(false);
+  }
+
+  overlayGetImGuiRect(windowRects);
+  igEnd();
+
+  return 1;
+}
+
+struct LG_OverlayOps LGOverlayMsg =
+{
+  .name           = "msg",
+  .init           = msg_init,
+  .free           = msg_free,
+  .needs_overlay  = msg_needsOverlay,
+  .render         = msg_render
+};
+
+bool overlayMsg_modal(void)
+{
+  return ll_count(l_msg.messages) > 0;
+}
+
+void overlayMsg_show(const char * caption, const char * fmt, va_list args)
+{
+  struct Msg * msg = malloc(sizeof(*msg));
+  msg->caption = strdup(caption);
+  msg->lines   = stringlist_new(false);
+  valloc_sprintf(&msg->message, fmt, args);
+
+  char * rest = msg->message;
+  char * token;
+  stringlist_clear(msg->lines);
+  while((token = strtok_r(rest, "\n", &rest)))
+    stringlist_push(msg->lines, token);
+
+  ll_push(l_msg.messages, msg);
+  app_invalidateOverlay(false);
+}

client/src/overlays.h

@@ -37,9 +37,13 @@ extern struct LG_OverlayOps LGOverlayFPS;
 extern struct LG_OverlayOps LGOverlayGraphs;
 extern struct LG_OverlayOps LGOverlayHelp;
 extern struct LG_OverlayOps LGOverlayConfig;
+extern struct LG_OverlayOps LGOverlayMsg;
 
 void overlayAlert_show(LG_MsgAlert type, const char * fmt, va_list args);
 
+bool overlayMsg_modal(void);
+void overlayMsg_show(const char * caption, const char * fmt, va_list args);
+
 GraphHandle overlayGraph_register(const char * name, RingBuffer buffer,
     float min, float max);
 void overlayGraph_unregister();

common/include/common/stringlist.h

@@ -31,5 +31,6 @@ int          stringlist_push  (StringList sl, char * str);
 void         stringlist_remove(StringList sl, unsigned int index);
 unsigned int stringlist_count (StringList sl);
 char *       stringlist_at    (StringList sl, unsigned int index);
+void         stringlist_clear (StringList sl);
 
 #endif

common/src/stringlist.c

@@ -44,12 +44,7 @@ StringList stringlist_new(bool owns_strings)
 
 void stringlist_free(StringList * sl)
 {
-  if ((*sl)->owns_strings)
-  {
-    char * ptr;
-    vector_forEach(ptr, &(*sl)->vector)
-      free(ptr);
-  }
+  stringlist_clear(*sl);
 
   vector_destroy(&(*sl)->vector);
   free((*sl));
@@ -82,3 +77,15 @@ char * stringlist_at(StringList sl, unsigned int index)
   vector_at(&sl->vector, index, &ptr);
   return ptr;
 }
+
+void stringlist_clear(StringList sl)
+{
+  if (sl->owns_strings)
+  {
+    char * ptr;
+    vector_forEach(ptr, &sl->vector)
+      free(ptr);
+  }
+
+  vector_clear(&sl->vector);
+}