From a336165cefb78adfe04a75b0f339ddf934d43737 Mon Sep 17 00:00:00 2001
From: superp00t <superp00t@tutanota.com>
Date: Sun, 26 Nov 2023 12:13:32 -0500
Subject: [PATCH] feat(gx): translate SDL_TextInput events into OS_INPUT_CHAR
 events

---
 src/gx/glsdl/GLSDLWindow.cpp | 43 +++++++++++++++++++++++++++++++-----
 src/gx/glsdl/GLSDLWindow.hpp |  1 +
 2 files changed, 38 insertions(+), 6 deletions(-)

diff --git a/src/gx/glsdl/GLSDLWindow.cpp b/src/gx/glsdl/GLSDLWindow.cpp
index 04f7261..ad003ae 100644
--- a/src/gx/glsdl/GLSDLWindow.cpp
+++ b/src/gx/glsdl/GLSDLWindow.cpp
@@ -199,6 +199,8 @@ void GLSDLWindow::Create(const char* title, const GLSDLWindowRect& rect, GLTextu
     );
 
     BLIZZARD_ASSERT(this->m_sdlWindow != nullptr);
+
+    SDL_StartTextInput();
 }
 
 void GLSDLWindow::Swap() {
@@ -210,7 +212,6 @@ void GLSDLWindow::Swap() {
     }
 }
 
-
 void GLSDLWindow::Destroy() {
     SDL_DestroyWindow(this->m_sdlWindow);
     this->m_sdlWindow = nullptr;
@@ -282,6 +283,9 @@ void GLSDLWindow::DispatchSDLEvent(const SDL_Event& event) {
     case SDL_EVENT_MOUSE_MOTION:
         this->DispatchSDLMouseMotionEvent(event);
         break;
+    case SDL_EVENT_TEXT_INPUT:
+        this->DispatchSDLTextInputEvent(event);
+        break;
     case SDL_EVENT_QUIT:
         EventPostClose();
         break;
@@ -296,14 +300,15 @@ void GLSDLWindow::DispatchSDLKeyboardEvent(const SDL_Event& event) {
 
     // What key does this SDL scancode correspond to?
     auto lookup = s_keyConversion.find(event.key.keysym.scancode);
-    if (lookup == s_keyConversion.end()) {
-        // No corresponding KEY to this scancode
+    if (lookup != s_keyConversion.end()) {
+        // Scancode was found
+        KEY key = lookup->second;
+
+        // Push key event into input queue
+        OsQueuePut(inputclass, key, 0, 0, 0);
         return;
     }
-    KEY key = lookup->second;
 
-    // Push key event into input queue
-    OsQueuePut(inputclass, key, 0, 0, 0);
 }
 
 void GLSDLWindow::DispatchSDLMouseMotionEvent(const SDL_Event& event) {
@@ -331,3 +336,29 @@ void GLSDLWindow::DispatchSDLMouseButtonEvent(const SDL_Event& event) {
     // Push mousebutton event into input queue
     OsQueuePut(inputclass, button, x, y, 0);
 }
+
+void GLSDLWindow::DispatchSDLTextInputEvent(const SDL_Event& event) {
+    // text input string holding one or more UTF-8 characters
+    auto text = reinterpret_cast<const uint8_t*>(event.text.text);
+
+    // Because SDL_TextInputEvent can hold multiple UTF-8 characters
+    // explode variable number of these characters into
+    // individual OS_INPUT_CHAR events
+    while (*text != '\0') {
+        // byte size of current UTF-8 character
+        uint32_t charactersize = 0;
+
+        // Read UTF-8 character
+        auto character = static_cast<int32_t>(SUniGetUTF8(text, &charactersize));
+        if (character < 0) {
+            // Cancel in case of invalid input
+            break;
+        }
+
+        // Push character to input queue
+        OsQueuePut(OS_INPUT_CHAR, character, 1, 0, 0);
+
+        // Advance text pointer
+        text += charactersize;
+    }
+}
diff --git a/src/gx/glsdl/GLSDLWindow.hpp b/src/gx/glsdl/GLSDLWindow.hpp
index ce79135..a0a288f 100644
--- a/src/gx/glsdl/GLSDLWindow.hpp
+++ b/src/gx/glsdl/GLSDLWindow.hpp
@@ -34,6 +34,7 @@ class GLSDLWindow {
         void DispatchSDLKeyboardEvent(const SDL_Event& event);
         void DispatchSDLMouseMotionEvent(const SDL_Event& event);
         void DispatchSDLMouseButtonEvent(const SDL_Event& event);
+        void DispatchSDLTextInputEvent(const SDL_Event& event);
         void Resize(const GLSDLWindowRect& rect);
 
         GLSDLWindowRect GetRect();