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

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+// Copyright (c) 2023 Dominic Masters
+// 
+// This software is released under the MIT License.
+// https://opensource.org/licenses/MIT
+
+#pragma once
+#include "scene/components/ui/UIComponentRenderable.hpp"
+#include "display/mesh/QuadMesh.hpp"
+#include "asset/assets/NewTrueTypeAsset.hpp"
+#include "util/Xml.hpp"
+
+#define UI_LABEL_MAX_WIDTH_NONE -1
+
+namespace Dawn {
+  struct UILabelStyle {
+    struct Color color = COLOR_WHITE;
+    flag_t style = 0;
+    uint32_t size = 16;
+    NewTrueTypeAsset *font = nullptr;
+  };
+
+  struct UILabelText {
+    std::string text;
+    struct UILabelStyle style;
+
+    // Part index?
+    // Quad start?
+    // quad count?
+    // position?
+    // size?
+    // some kind of custom data e.g. wobble or shake?
+
+    usagelockid_t lockId = -1;
+    struct NewTrueTypeFaceTexture *texture = nullptr;
+  };
+
+  class UILabel : public UIComponentRenderable {
+    private:
+      Mesh mesh;
+      FontShaderBuffer shaderBuffer;
+      std::vector<struct UILabelText> texts;
+      std::map<NewTrueTypeFaceTexture*, int32_t> textureMap;
+
+      /**
+       * Buffers the quads for the given text and updates the progressing values
+       * as the buffer process continues.
+       * 
+       * @param text Text information to buffer.
+       * @param bufferData The output quad mappings for the text.
+       * @param textureMap Texture map for the textures to map.
+       * @param position The 2D position to buffer the quads at.
+       * @param quadStart The starting quad index.
+       * @param partIndex The part index to store for each quad buffered.
+       * @return The number of quads buffered, not the string length.
+       */
+      int32_t bufferQuads(
+        struct UILabelText text,
+        struct FontShaderBufferData &bufferData,
+        std::map<NewTrueTypeFaceTexture*, int32_t> &textureMap,
+        glm::vec2 &position,
+        int32_t quadStart,
+        int32_t partIndex
+      );
+
+    public:
+      int32_t quadStart = 0;
+      int32_t quadCount = -1;
+      int32_t quadCountTotal = -1;
+
+      UILabel(SceneItem *item);
+
+      void onStart() override;
+      std::vector<struct ShaderPassItem> getUIRenderPasses() override;
+      float_t getContentWidth() override;
+      float_t getContentHeight() override;
+
+      /**
+       * Rebuffer the quads for this label. This method will perform all the
+       * necessary difference calculations from where the current state of this text is.
+       * 
+       * @param texts Texts to buffer.
+       */
+      void rebufferQuads(std::vector<struct UILabelText> texts);
+  };
+}