Text rendering working ok.

src/fonts/FontGlyph.cpp

@@ -5,9 +5,9 @@ FontGlyph::FontGlyph(unsigned width, unsigned height, unsigned bearingX, unsigne
     : mImage(std::move(image)),
       mWidth(width),
       mHeight(height),
-      mBearingX(mBearingX),
+      mBearingX(bearingX),
-      mBearingY(mBearingY),
+      mBearingY(bearingY),
-      mAdvanceX(mAdvanceX)
+      mAdvanceX(advanceX)
 {
 
 }

src/fonts/FontItem.h

@@ -28,6 +28,16 @@ public:
         mPath = path;
     }
 
+    const std::string& getFaceName() const
+    {
+        return mFaceName;
+    }
+
+    unsigned getSize() const
+    {
+        return mSize;
+    }
+
 private:
     unsigned mSize{16};
     std::string mFaceName;

src/fonts/FontsManager.cpp

@@ -20,8 +20,12 @@ IFontEngine* FontsManager::getFontEngine() const
     return mFontEngine.get();
 }
 
-FontGlyph* FontsManager::getGlyph(char c)
+FontGlyph* FontsManager::getGlyph(const std::string& fontFace, int size, char c)
 {
+    auto path = std::filesystem::path("truetype/msttcorefonts/arial.ttf");
+
+    mFontEngine->loadFontFace(path, size);
+
     auto iter = mGlyphs.find(c);
     if(iter != mGlyphs.end())
     {

src/fonts/FontsManager.h

@@ -15,7 +15,7 @@ public:
 
     IFontEngine* getFontEngine() const;
 
-    FontGlyph* getGlyph(char c);
+    FontGlyph* getGlyph(const std::string& fontFace, int size, char c);
 
 private:
     std::unique_ptr<IFontEngine> mFontEngine;

src/fonts/FreeTypeFontEngine.cpp

@@ -25,6 +25,11 @@ void FreeTypeFontEngine::loadFontFace(const std::filesystem::path& fontFile, int
         initialize();
     }
 
+    if (mWorkingFontFace)
+    {
+        return;
+    }
+
     const auto full_path = mSystemFontLocation / fontFile;
     const auto error = FT_New_Face(mLibrary, full_path.c_str(), 0, &mWorkingFontFace );
     if ( error == FT_Err_Unknown_File_Format )
@@ -40,7 +45,7 @@ void FreeTypeFontEngine::loadFontFace(const std::filesystem::path& fontFile, int
 
 std::unique_ptr<FontGlyph> FreeTypeFontEngine::loadGlyph(unsigned charCode)
 {
-    auto glyph_index = FT_Get_Char_Index( mWorkingFontFace, 65 );
+    auto glyph_index = FT_Get_Char_Index( mWorkingFontFace, charCode );
     if (glyph_index == 0)
     {
         MLOG_ERROR("Got the null glyph");

src/graphics/opengl/OpenGlFontTexture.cpp

@@ -34,3 +34,8 @@ OpenGlFontTexture::OpenGlFontTexture(FontGlyph* glyph)
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 
 }
+
+FontGlyph* OpenGlFontTexture::getGlyph() const
+{
+    return mGlyph;
+}

src/graphics/opengl/OpenGlFontTexture.h

@@ -7,6 +7,13 @@ class OpenGlFontTexture
 public:
     OpenGlFontTexture(FontGlyph* glyph);
 
+    unsigned int getHandle() const
+    {
+        return mHandle;
+    }
+
+    FontGlyph* getGlyph() const;
+
 private:
     unsigned int mHandle{0};
     FontGlyph* mGlyph{nullptr};

src/graphics/opengl/OpenGlPainter.cpp

@@ -72,23 +72,80 @@ void OpenGlPainter::renderTextLayer(const TextData& textData, DrawingContext* co
         initializeTextShader();
     }
 
-    auto first_char = textData.mContent[0];
+    for (auto c : textData.mContent)
-    auto iter = mFontTextures.find(first_char);
-    OpenGlFontTexture* working_texture{nullptr};
-    if (iter == mFontTextures.end())
     {
-        auto glyph = context->getFontsManager()->getGlyph(first_char);
+        if (auto iter = mFontTextures.find(c); iter == mFontTextures.end())
-        auto new_texture = std::make_unique<OpenGlFontTexture>(nullptr);
+        {
-        working_texture = new_texture.get();
+            auto glyph = context->getFontsManager()->getGlyph(textData.mFont.getFaceName(), textData.mFont.getSize(), c);
-        mFontTextures[first_char] = std::move(new_texture);
+            auto new_texture = std::make_unique<OpenGlFontTexture>(glyph);
-    }
+            mFontTextures[c] = std::move(new_texture);
-    else
+        }
-    {
-        working_texture = iter->second.get();
     }
 
     glEnable(GL_BLEND);
     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+    const auto width = float(context->getSurface()->getWidth());
+    const auto height = float(context->getSurface()->getHeight());
+
+    glm::mat4 projection = glm::ortho(0.0f, width, 0.0f, height);
+
+    unsigned int VAO, VBO;
+    glGenVertexArrays(1, &VAO);
+    glGenBuffers(1, &VBO);
+    glBindVertexArray(VAO);
+    glBindBuffer(GL_ARRAY_BUFFER, VBO);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(float) * 6 * 4, NULL, GL_DYNAMIC_DRAW);
+    glEnableVertexAttribArray(0);
+    glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 4 * sizeof(float), 0);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glBindVertexArray(0);
+
+    glUseProgram(mTextShaderProgram->getHandle());
+    glUniform3f(glGetUniformLocation(mTextShaderProgram->getHandle(), "textColor"), 0.0, 0.0, 0.0);
+    glUniformMatrix4fv(glGetUniformLocation(mTextShaderProgram->getHandle(), "projection"), 1, GL_FALSE, glm::value_ptr(projection));
+    glActiveTexture(GL_TEXTURE0);
+    glBindVertexArray(VAO);
+
+    //glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+
+    // iterate through all characters
+    float x = textData.mLocation.GetX();
+    const float y = textData.mLocation.GetY();
+
+    for (auto c :  textData.mContent)
+    {
+        auto texture = mFontTextures[c].get();
+
+        float xpos = x + texture->getGlyph()->getBearingX();
+        float ypos = y - (texture->getGlyph()->getHeight() - texture->getGlyph()->getBearingY());
+
+        float w = texture->getGlyph()->getWidth();
+        float h = texture->getGlyph()->getHeight();
+        // update VBO for each character
+        float vertices[6][4] = {
+            { xpos,     ypos + h,   0.0f, 0.0f },
+            { xpos,     ypos,       0.0f, 1.0f },
+            { xpos + w, ypos,       1.0f, 1.0f },
+
+            { xpos,     ypos + h,   0.0f, 0.0f },
+            { xpos + w, ypos,       1.0f, 1.0f },
+            { xpos + w, ypos + h,   1.0f, 0.0f }
+        };
+
+        // render glyph texture over quad
+        glBindTexture(GL_TEXTURE_2D, texture->getHandle());
+        // update content of VBO memory
+        glBindBuffer(GL_ARRAY_BUFFER, VBO);
+        glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertices), vertices);
+        glBindBuffer(GL_ARRAY_BUFFER, 0);
+        // render quad
+        glDrawArrays(GL_TRIANGLES, 0, 6);
+        // now advance cursors for next glyph (note that advance is number of 1/64 pixels)
+        x += (texture->getGlyph()->getAdvanceX() >> 6); // bitshift by 6 to get value in pixels (2^6 = 64)
+    }
+    glBindVertexArray(0);
+    glBindTexture(GL_TEXTURE_2D, 0);
 }
 
 void OpenGlPainter::renderMeshLayer(TriMesh* mesh, DrawingContext* context)
@@ -193,6 +250,8 @@ void OpenGlPainter::paint(DrawingContext* context)
 
     glViewport(0, 0, width, height);
     //glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
+    glOrtho(0, width, 0, height, -1.0, 1.0);
+
     //glScissor(0, 0, width, height);
     //glMatrixMode(GL_PROJECTION);
     //glLoadIdentity();

src/windows/ui_interfaces/x11/XcbInterface.cpp

@@ -145,8 +145,7 @@ uint32_t XcbInterface::getEventMask()
     return XCB_EVENT_MASK_KEY_RELEASE |
             XCB_EVENT_MASK_BUTTON_PRESS |
             XCB_EVENT_MASK_BUTTON_RELEASE |
-            XCB_EVENT_MASK_EXPOSURE |
+            XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_STRUCTURE_NOTIFY;
-            XCB_EVENT_MASK_RESIZE_REDIRECT;
 }
 
 void XcbInterface::addWindow(mt::Window* window)
@@ -211,42 +210,39 @@ void XcbInterface::loop()
                 mDesktopManager->onUiEvent(std::move(ui_event));
                 break;
             }
-            case XCB_RESIZE_REQUEST:
+            case XCB_CONFIGURE_NOTIFY:
             {
-                auto resize = (xcb_resize_request_event_t*) event;
+                auto config_event = (xcb_configure_notify_event_t*) event;
-                int width = 1;
+                auto mainWindow = mDesktopManager->getWindowManager()->getMainWindow();
-                int height = 1;
+                auto width = mainWindow->getWidth();
-                if (resize->width > 0)
+                auto height = mainWindow->getHeight();
+
+                bool changed = false;
+                if (config_event->width != width)
                 {
-                    width = resize->width;
+                    width = config_event->width;
+                    changed = true;
                 }
-                if (resize->height > 0)
+                if (config_event->height != height)
                 {
-                    height = resize->height;
+                    height = config_event->height;
+                    changed = true;
+                }
+                if (changed)
+                {
+                    auto ui_event = std::make_unique<ResizeEvent>(width, height);
+                    mDesktopManager->onUiEvent(std::move(ui_event));
                 }
-                auto ui_event = std::make_unique<ResizeEvent>(width, height);
-                mDesktopManager->onUiEvent(std::move(ui_event));
                 break;
             }
             default:
                 /* Unknown event type, ignore it */
                 break;
         }
-        onEventsDispatched();
         free(event);
     }
 }
 
-void XcbInterface::onEventsDispatched()
-{
-    if (mDesktopManager->isModified())
-    {
-        mDesktopManager->setIsModified(false);
-        auto mainWindow = mDesktopManager->getWindowManager()->getMainWindow();
-        mainWindow->clear();
-    }
-}
-
 void XcbInterface::shutDown()
 {
     mDesktopManager->getWindowManager()->clearPlatformWindows();

src/windows/ui_interfaces/x11/XcbInterface.h

@@ -38,7 +38,6 @@ public:
 private:
     void initialize() override;
     void onPaint();
-    void onEventsDispatched();
     void onExposeEvent(xcb_expose_event_t* event);
 
     void initializeHardwareRendering() override;