Added text alignment support.

src/dawn/scene/components/ui/text/UILabel.cpp

@@ -22,12 +22,65 @@ void UILabel::onStart() {
   this->shaderBuffer.init();
 
   useEvent([&]{
+    // TODO: I believe I only need to rebuffer here if maxWidth is not -1
     this->rebufferQuads(this->texts);
   }, eventAlignmentUpdated);
 
   useEffect([&]{
     this->rebufferQuads(this->texts);
   }, lineHeight);
+  
+  useEvent([&]{
+    this->updateTextAlignments();
+  }, eventTextChanged);
+
+  useEffect([&]{
+    this->updateTextAlignments();
+  }, this->textAlign);
+}
+
+void UILabel::updateTextAlignments() {
+  struct FontShaderBufferData data;
+
+  switch(this->textAlign) {
+    case UI_LABEL_TEXT_ALIGN_LEFT: {
+      auto itLine = lines.begin();
+      int32_t i = 0;
+      while(itLine != lines.end()) {
+        data.linePositions[i] = glm::vec2(0, 0);
+        ++itLine;
+      }
+      break;
+    }
+    
+    case UI_LABEL_TEXT_ALIGN_RIGHT: {
+      float_t widthBased = this->getWidth();
+      auto itLine = lines.begin();
+      int32_t i = 0;
+      while(itLine != lines.end()) {
+        data.linePositions[i] = glm::vec2(widthBased - itLine->width, 0);
+        ++itLine;
+      }
+      break;
+    }
+
+    case UI_LABEL_TEXT_ALIGN_CENTER: {
+      float_t widthBased = this->getWidth();
+      auto itLine = lines.begin();
+      int32_t i = 0;
+      while(itLine != lines.end()) {
+        float_t x = (widthBased - itLine->width) / 2.0f;
+        data.linePositions[i] = glm::vec2(x, 0);
+        ++itLine;
+      }
+      break;
+    }
+
+    default:
+      assertUnreachable("UILabel::updateTextAlignments: TextAlign invalid");
+  }
+
+  this->shaderBuffer.buffer(&data, &data.linePositions);
 }
 
 std::vector<struct ShaderPassItem> UILabel::getUIRenderPasses() {

src/dawn/scene/components/ui/text/UILabel.hpp

@@ -59,6 +59,8 @@ namespace Dawn {
       bool_t ignoreAlignmentUpdate = false;
       bool_t hasDecorations = false;
 
+      void updateTextAlignments();
+
     public:
       int32_t quadStart = 0;
       int32_t quadCount = -1;