*misc

1 files changed, 175 insertions, 0 deletions

diff --git a/Runtime/GUI/UITextMesh.cpp b/Runtime/GUI/UITextMesh.cpp
new file mode 100644
index 0000000..6a10f88
--- /dev/null
+++ b/Runtime/GUI/UITextMesh.cpp
@@ -0,0 +1,175 @@
+#include "../Graphics/CustomVertexLayout.h"
+#include "Runtime/Utilities/StaticInitiator.h"
+#include "../Math/Math.h"
+#include "../Graphics/Color.h"
+#include "UITextMesh.h"
+#include "../Graphics/DefaultVertexLayout.h"
+#include "Runtime/Debug/Log.h"
+#include <vector>
+#include <unordered_map>
+#include "Runtime/Graphics/GfxDevice.h"
+
+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_SizePerIndex;
+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_IndicesPerText = 6;
+    s_SizePerIndex = VertexLayout::GetDefaultIndexSize();
+
+	s_SizePerText = sizeof(TextMeshVBOLayout) * 4;
+});
+
+// 一段文字里面的网格可能会来自不同的atlas，在生成UITextMesh时做好合批
+
+// 需要支持
+// * 大小
+// * 锚点
+// * 对齐方式
+// * 换行
+// * 颜色
+
+UITextMesh::UITextMesh(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 atlasIndex = ch->atlas;
+		
+		TextInfo info;
+		info.ch = ch;
+		info.offset = offset;
+
+		auto list = s_TextInfos.find(atlasIndex);
+		if (list == s_TextInfos.end())
+			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;
+	}
+
+	if (s_TextInfos.size() == 0)
+		return;
+
+    // 填充VBO和IBO
+	for (auto iter : s_TextInfos) {
+		unsigned int atlasIndex = iter.first; // atlas atlasIndex
+		vector<TextInfo>& texts = iter.second;
+		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;
+			// 左上角是原点
+            float pos[] = {
+				text.offset + text.ch->bearing.x,                           pixelSize - text.ch->bearing.y + text.ch->position.height, // bottom-left
+				text.offset + text.ch->bearing.x + text.ch->position.width, pixelSize - text.ch->bearing.y + text.ch->position.height, // bottom-right 
+				text.offset + text.ch->bearing.x + text.ch->position.width, pixelSize - text.ch->bearing.y,                            // top-right 
+				text.offset + text.ch->bearing.x,                           pixelSize - text.ch->bearing.y,                            // top-left 
+            };
+            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 UITextMesh::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();
+    }
+}