1 files changed, 90 insertions, 14 deletions

diff --git a/Runtime/GUI/TextMesh.cpp b/Runtime/GUI/TextMesh.cpp
index 6f3b3d6..de9a195 100644
--- a/Runtime/GUI/TextMesh.cpp
+++ b/Runtime/GUI/TextMesh.cpp
@@ -3,8 +3,11 @@
 #include "../Math/Math.h"
 #include "../Graphics/Color.h"
 #include "TextMesh.h"
+#include "../Graphics/DefaultVertexLayout.h"
+#include "Runtime/Debug/Log.h"
 #include <vector>
 #include <unordered_map>
+#include "Runtime/Graphics/GfxDevice.h"
 
 using namespace std;
 
@@ -20,6 +23,7 @@ static CustomVertexLayout s_TextMeshVBOLayout;
 static unsigned int s_VertexPerText;
 static unsigned int s_SizePerVertex;
 static unsigned int s_SizePerText;
+static unsigned int s_SizePerIndex;
 static unsigned int s_IndicesPerText;
 
 struct TextInfo {
@@ -39,33 +43,36 @@ InitializeStaticVariables([]() {
 
 	s_VertexPerText = 4;
 	s_SizePerVertex = sizeof(TextMeshVBOLayout);
+
+    s_IndicesPerText = 6;
+    s_SizePerIndex = VertexLayout::GetDefaultIndexSize();
+
 	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();
+    const Vector2 atlasSize = font->GetAtlasSize();
 
+    // 按照不同的atlas分类到s_TextInfos
 	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;
+		unsigned int atlasIndex = ch->atlas;
 		
 		TextInfo info;
 		info.ch = ch;
 		info.offset = offset;
 
-		auto list = s_TextInfos.find(index);
+		auto list = s_TextInfos.find(atlasIndex);
 		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;
+			s_TextInfos.insert(std::pair<unsigned int, vector<TextInfo>>(atlasIndex, vector<TextInfo>()));
+
+        vector<TextInfo>& v = s_TextInfos[atlasIndex];
 		v.push_back(info);
 
 		offset += ch->advance;
@@ -74,17 +81,86 @@ TextMesh::TextMesh(const UnicodeString& str, Font* font,int pixelSize, ETextAnch
 	if (s_TextInfos.size() == 0)
 		return;
 
+    // 填充VBO和IBO
 	for (auto iter : s_TextInfos) {
-		unsigned int index = iter.first;
+		unsigned int atlasIndex = iter.first; // atlas atlasIndex
 		vector<TextInfo>& texts = iter.second;
-		int count = texts.size();
-
-		VertexBuffer* vb = new VertexBuffer(count * s_SizePerText, count * s_IndicesPerText, VertexBuffer::VertexBufferType_Static);
-
+		int textCount = texts.size();
+
+		VertexBuffer* vb = new VertexBuffer(textCount * s_SizePerText, textCount * s_IndicesPerText * s_SizePerIndex, VertexBuffer::VertexBufferType_Static);
+        void* pVB;
+        uint16* pIB;
+
+        vb->GetChunk(s_SizePerVertex, s_SizePerIndex, s_VertexPerText * textCount, s_IndicesPerText * textCount, EPrimitive::Primitive_Triangle, &pVB,(void**) &pIB);
+
+        TextMeshVBOLayout* dst = (TextMeshVBOLayout*)pVB;
+        for (int i = 0; i < textCount; ++i)
+        {
+            TextInfo& text = texts[i];
+
+            int vOff = i * s_VertexPerText;
+            float pos[] = {
+                text.offset + text.ch->bearing.x,                           text.ch->bearing.y - text.ch->position.height, // bottom-left
+                text.offset + text.ch->bearing.x + text.ch->position.width, text.ch->bearing.y - text.ch->position.height, // bottom-right 
+                text.offset + text.ch->bearing.x + text.ch->position.width, text.ch->bearing.y,                            // top-right 
+                text.offset + text.ch->bearing.x,                           text.ch->bearing.y,                            // top-left 
+            };
+            // 左上角为UV原点，所以在shader里采样的时候要镜像y
+            Vector4 uvQuad = Vector4(text.ch->position.x / atlasSize.x, text.ch->position.y / atlasSize.y, text.ch->position.width / atlasSize.x, text.ch->position.height / atlasSize.y);
+            float uv[] = {
+                uvQuad.x,            uvQuad.y + uvQuad.w,
+                uvQuad.x + uvQuad.z, uvQuad.y + uvQuad.w,
+                uvQuad.x + uvQuad.z, uvQuad.y,
+                uvQuad.x,            uvQuad.y,
+            };
+            for (int j = 0; j < s_VertexPerText; ++j)
+            {
+                dst[vOff + j].position.Set(pos[2 * j], pos[2 * j + 1]);
+                dst[vOff + j].uv.Set(uv[2 * j], uv[2 * j + 1]);
+                dst[vOff + j].color.Set(255 , 255, 255, 255);
+            }
+
+            int iOff = i * s_IndicesPerText;
+            int indices[] = {
+                0, 1, 3, // right-top  
+                1, 2, 3, // left-bottom
+            };
+            for (int j = 0; j < s_IndicesPerText; ++j)
+                pIB[iOff + j] = vOff + indices[j];
+        }
+
+        vb->FlushChunk(s_VertexPerText * textCount, s_IndicesPerText * textCount);
+

+        m_VBOs.insert(std::pair<int, VertexBuffer*>(atlasIndex, vb));
 	}
+
+    WipeGLError();
 }
 
 void TextMesh::Draw()
 {
-
+    for (auto subText : m_VBOs)
+    {
+        int atlasIndex = subText.first; // atlasIndex of atlas
+        VertexBuffer* vbo = subText.second; 
+
+        const GlyphAtals* atlas = m_Font->GetGlyphAtlas(atlasIndex);
+        if (atlas == NULL)
+        {
+            log_error("Render text failed, no glyph atlas.");
+            continue;
+        }
+
+        g_GfxDevice.SetUniformTexture("gamelab_main_tex", atlas->altas);
+
+        CheckGLError(
+            throw GLException(error);
+        );
+        vbo->Draw(s_TextMeshVBOLayout);
+
+        CheckGLError(
+            throw GLException(error);
+        );
+        g_GfxDevice.ResetUniformsState();
+    }
 }