From b7511abf1a1f302b5c7ebf50faaf65b62d7bb6ed Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Tue, 2 Nov 2021 09:30:25 +0800
Subject: * TextMesh

---
 Runtime/GUI/Font.h              | 12 ++++--
 Runtime/GUI/TextMesh.cpp        | 90 +++++++++++++++++++++++++++++++++++++++++
 Runtime/GUI/TextMesh.h          | 23 ++++++++++-
 Runtime/GUI/TextMeshGenerator.h | 14 +++++++
 4 files changed, 135 insertions(+), 4 deletions(-)

(limited to 'Runtime/GUI')

diff --git a/Runtime/GUI/Font.h b/Runtime/GUI/Font.h
index 344cc00..9fea14e 100644
--- a/Runtime/GUI/Font.h
+++ b/Runtime/GUI/Font.h
@@ -15,10 +15,10 @@
 //https://github.com/kaienfr/Font
 
 struct Character {
-	unsigned int      atlas;    // atlas索引
-	Rect    position; // 在altas里的位置
+	unsigned int atlas;    // atlas索引
+	Rect position; // 在altas里的位置
 	Vector2 bearing;  // 左上角相对于原点的偏移
-	unsigned int      advance;  // 总宽，算上了间隔
+	unsigned int advance;  // 总宽，算上了间隔
 };
 
 namespace character
@@ -42,6 +42,12 @@ namespace character
 	};
 }
 
+struct UnicodeString
+{
+	character::Codepoint* str;
+	int length;
+};
+
 namespace std
 {
 	template <>
diff --git a/Runtime/GUI/TextMesh.cpp b/Runtime/GUI/TextMesh.cpp
index e69de29..6f3b3d6 100644
--- a/Runtime/GUI/TextMesh.cpp
+++ b/Runtime/GUI/TextMesh.cpp
@@ -0,0 +1,90 @@
+#include "../Graphics/CustomVertexLayout.h"
+#include "Runtime/Utilities/StaticInitiator.h"
+#include "../Math/Math.h"
+#include "../Graphics/Color.h"
+#include "TextMesh.h"
+#include <vector>
+#include <unordered_map>
+
+using namespace std;
+
+struct TextMeshVBOLayout
+{
+	Vector2 position;
+	Vector2 uv;
+	Color32 color;
+};
+
+static CustomVertexLayout s_TextMeshVBOLayout;
+
+static unsigned int s_VertexPerText;
+static unsigned int s_SizePerVertex;
+static unsigned int s_SizePerText;
+static unsigned int s_IndicesPerText;
+
+struct TextInfo {
+	const Character* ch;
+	float offset;
+};
+
+static unordered_map<unsigned int, vector<TextInfo>> s_TextInfos;
+
+InitializeStaticVariables([]() {
+	VertexAttributeDescriptor POSITION = VertexAttributeDescriptor(0, 2, VertexAttrFormat_Float, sizeof(TextMeshVBOLayout));
+	VertexAttributeDescriptor UV = VertexAttributeDescriptor(sizeof(Vector2), 2, VertexAttrFormat_Float, sizeof(TextMeshVBOLayout));
+	VertexAttributeDescriptor COLOR = VertexAttributeDescriptor(sizeof(Vector2)*2, 4, VertexAttrFormat_Unsigned_Byte, sizeof(TextMeshVBOLayout), true);
+	s_TextMeshVBOLayout.attributes.push_back(POSITION);
+	s_TextMeshVBOLayout.attributes.push_back(UV);
+	s_TextMeshVBOLayout.attributes.push_back(COLOR);
+
+	s_VertexPerText = 4;
+	s_SizePerVertex = sizeof(TextMeshVBOLayout);
+	s_SizePerText = sizeof(TextMeshVBOLayout) * 4;
+	s_IndicesPerText = 6;
+});
+
+TextMesh::TextMesh(const UnicodeString& str, Font* font,int pixelSize, ETextAnchor anchor, ETextAlignment alignment)
+{
+	m_Font = font;
+	s_TextInfos.clear();
+
+	float offset = 0;
+	for (int i = 0; i < str.length; ++i)
+	{
+		character::Codepoint c = str.str[i];
+		const Character* ch = font->GetCharacter(c, pixelSize);
+		unsigned int index = ch->atlas;
+		
+		TextInfo info;
+		info.ch = ch;
+		info.offset = offset;
+
+		auto list = s_TextInfos.find(index);
+		if (list == s_TextInfos.end())
+		{
+			s_TextInfos.insert(std::pair<unsigned int, vector<TextInfo>>(index, vector<TextInfo>()));
+			list = s_TextInfos.find(index);
+		}
+		vector<TextInfo>& v = list->second;
+		v.push_back(info);
+
+		offset += ch->advance;
+	}
+
+	if (s_TextInfos.size() == 0)
+		return;
+
+	for (auto iter : s_TextInfos) {
+		unsigned int index = iter.first;
+		vector<TextInfo>& texts = iter.second;
+		int count = texts.size();
+
+		VertexBuffer* vb = new VertexBuffer(count * s_SizePerText, count * s_IndicesPerText, VertexBuffer::VertexBufferType_Static);
+
+	}
+}
+
+void TextMesh::Draw()
+{
+
+}
diff --git a/Runtime/GUI/TextMesh.h b/Runtime/GUI/TextMesh.h
index 2ca4618..8a29c92 100644
--- a/Runtime/GUI/TextMesh.h
+++ b/Runtime/GUI/TextMesh.h
@@ -1,5 +1,10 @@
 #pragma once
 #include "../Graphics/VertexBuffer.h"
+#include "Font.h"
+#include "Runtime/Utilities/Exception.h"
+#include <unordered_map>
+
+CustomException(TextMeshException);
 
 enum ETextAnchor
 {
@@ -22,11 +27,27 @@ enum ETextAlignment {
     TextAlignment_Auto,
 };
 
+typedef unsigned long long TextMeshHash;
+
+namespace TextHelper
+{
+	TextMeshHash GetTextMeshHash();
+}
+
+// 一段文字里面的网格可能会来自不同的atlas，在生成TextMesh时做好合批
+
 class TextMesh
 {
 public:
+	TextMesh(const UnicodeString& str, Font* font, int pixelSize, ETextAnchor anchor, ETextAlignment alignment)/*throw TextMeshException*/;
+
+	~TextMesh();
+
+	void Draw();
 
 private: 
-    VertexBuffer* m_VBO;
+	Font* m_Font;
+	std::unordered_map<int/*IndexOfAtlas*/, VertexBuffer*> m_VBOs;
+	
 
 };
diff --git a/Runtime/GUI/TextMeshGenerator.h b/Runtime/GUI/TextMeshGenerator.h
index c5992bd..baeaf16 100644
--- a/Runtime/GUI/TextMeshGenerator.h
+++ b/Runtime/GUI/TextMeshGenerator.h
@@ -1,6 +1,8 @@
 #pragma once 
 
+#include "TextMesh.h"
 #include "Runtime/Utilities/IIncrementalTask.h"
+#include "Font.h"
 
 // 回收长期没有被使用的text mesh 
 class GraduallyReleaseTextMesh : public IIncrementalTask
@@ -18,3 +20,15 @@ public:
 
 };
 
+
+class TextMeshGenerator : public Singleton<TextMeshGenerator>
+{
+public:
+	TextMesh* GetTextMesh(const UnicodeString& str);
+
+private:
+
+
+};
+
+#define g_TextMeshGenerator (*TextMeshGenerator::Instance())
\ No newline at end of file
-- 
cgit v1.1-26-g67d0