From f2cf4b537ffeba1ed78453fa7e368044da48929a Mon Sep 17 00:00:00 2001
From: zzz <1638644816@qq.com>
Date: Tue, 18 Apr 2023 18:53:45 +0800
Subject: [PATCH] vault backup: 2023-04-18 18:53:44

---
 .obsidian/workspace.json           | 120 ++++++++++++++++++-----------
 GPU/GPU渲染流程.md                 |  52 +++++++++++++
 Pasted image 20230413163234.png    | Bin 0 -> 17591 bytes
 并行计算/CPU/Brust.md              |   2 +
 并行计算/CPU/SIMD(单指令多数据).md |  11 +++
 并行计算/GPU/Compute Shader.md     |   0
 并行计算/GPU/SIMT.md               |   8 ++
 手写渲染器/课程.md                 |   2 +
 8 files changed, 150 insertions(+), 45 deletions(-)
 create mode 100644 GPU/GPU渲染流程.md
 create mode 100644 Pasted image 20230413163234.png
 create mode 100644 并行计算/CPU/Brust.md
 create mode 100644 并行计算/CPU/SIMD(单指令多数据).md
 create mode 100644 并行计算/GPU/Compute Shader.md
 create mode 100644 并行计算/GPU/SIMT.md
 create mode 100644 手写渲染器/课程.md

diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index dfffc48..88ddef5 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -7,56 +7,68 @@
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         "type": "tabs",
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-            "type": "leaf",
-            "state": {
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-              "state": {
-                "file": "程序集.md",
-                "mode": "source",
-                "source": false
-              }
-            }
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-          {
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-            "type": "leaf",
-            "state": {
-              "type": "markdown",
-              "state": {
-                "file": "网络同步.md",
-                "mode": "source",
-                "source": false
-              }
-            }
-          },
-          {
-            "id": "797b353e3b2a4938",
-            "type": "leaf",
-            "state": {
-              "type": "markdown",
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-                "file": "Issue/超出ScrollView的特效渲染层级不对.md",
-                "mode": "source",
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           {
             "id": "81fe1e09c99e234a",
             "type": "leaf",
             "state": {
               "type": "markdown",
               "state": {
-                "file": "程序集.md",
+                "file": "并行计算/CPU/Brust.md",
+                "mode": "source",
+                "source": false
+              }
+            }
+          },
+          {
+            "id": "6aedfe92a5b29e2f",
+            "type": "leaf",
+            "state": {
+              "type": "markdown",
+              "state": {
+                "file": "并行计算/GPU/Compute Shader.md",
+                "mode": "source",
+                "source": false
+              }
+            }
+          },
+          {
+            "id": "ea082afd946d50f4",
+            "type": "leaf",
+            "state": {
+              "type": "markdown",
+              "state": {
+                "file": "GPU/GPU渲染流程.md",
+                "mode": "source",
+                "source": false
+              }
+            }
+          },
+          {
+            "id": "f8f8f48dfb17b2a6",
+            "type": "leaf",
+            "state": {
+              "type": "markdown",
+              "state": {
+                "file": "网络同步.md",
+                "mode": "preview",
+                "source": false
+              }
+            }
+          },
+          {
+            "id": "e87e6d863c89589f",
+            "type": "leaf",
+            "state": {
+              "type": "markdown",
+              "state": {
+                "file": "手写渲染器/课程.md",
                 "mode": "source",
                 "source": false
               }
             }
           }
         ],
-        "currentTab": 2
+        "currentTab": 4
       }
     ],
     "direction": "vertical"
@@ -70,7 +82,7 @@
         "type": "tabs",
         "children": [
           {
-            "id": "b736346aa28b495c",
+            "id": "f2ac97a7addb8678",
             "type": "leaf",
             "state": {
               "type": "file-explorer",
@@ -98,7 +110,7 @@
       }
     ],
     "direction": "horizontal",
-    "width": 249
+    "width": 338.5
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   "right": {
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@@ -114,7 +126,7 @@
             "state": {
               "type": "backlink",
               "state": {
-                "file": "Issue/超出ScrollView的特效渲染层级不对.md",
+                "file": "手写渲染器/课程.md",
                 "collapseAll": false,
                 "extraContext": false,
                 "sortOrder": "alphabetical",
@@ -149,18 +161,36 @@
       "markdown-importer:打开 Markdown 格式转换器": false
     }
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-    "Issue/超出ScrollView的特效渲染层级不对.md",
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+    "手写渲染器",
     "程序集.md",
+    "GPU/GPU渲染流程.md",
+    "并行计算/GPU/SIMT.md",
+    "并行计算/GPU/Compute Shader.md",
     "操作系统/多级缓存队列.md",
+    "Pasted image 20230413163234.png",
+    "GPU",
+    "并行计算/CPU/SIMD(单指令多数据).md",
+    "并行计算/CPU/Brust.md",
+    "并行计算/GPU",
+    "并行计算/GPU.canvas",
+    "并行计算/CPU",
+    "并行计算/CPU.canvas",
+    "并行计算/未命名看板.md",
+    "未命名 2.canvas",
+    "未命名 1.canvas",
+    "未命名.canvas",
+    "并行计算/未命名看板 1.md",
+    "Issue/超出ScrollView的特效渲染层级不对.md",
+    "并行计算",
+    "Issue",
     "待办事项/TODO.md",
     "FairyGui/工作流.md",
     "编辑器/图片/Pasted image 20221025121100.png",
     "编辑器/SerializedObject.md",
-    "未命名.canvas",
     "编辑器/SearchFilter UnityEditor筛选器.md",
     "().md",
     "Mesh/Mesh Baker.md",
diff --git a/GPU/GPU渲染流程.md b/GPU/GPU渲染流程.md
new file mode 100644
index 0000000..c976625
--- /dev/null
+++ b/GPU/GPU渲染流程.md
@@ -0,0 +1,52 @@
+
+https://www.cnblogs.com/timlly/p/11471507.html
+参考网站
+
+# SM 流处理器
+	包括
+	运算核心
+	load/store 加载与储存
+	特殊数学运算 sin、cos、log
+	寄存器
+	L1缓存
+	全局内存缓存
+	纹理读取单元
+	纹理缓存
+	PolyMorph Engine:多边形引擎(负责属性装配、顶点拉取、曲面细分、栅格化 ~= 专门处理顶点相关)
+	2个Wrap Schedulers:负责wrap调度 1一个warp由32个线程组成，warp调度器的指令通过Dispatch Units送到Core执行。
+	指令缓存
+	内部链接网络(?)
+
+# GPU渲染管线
+	通过图形api调用drawcall->
+	指令推送到驱动,驱动检查是否合法->
+	驱动把指令缓存到buffer里->
+	下次flush会把指令推送到GPU->
+	----------主机-------
+	
+	GPU通过主机接口Host Interface接受命令->
+	通过前端(Front End)处理这些命令(?)-> Front End是哪儿
+	图元分配开始工作(indexbuffer产生三角形形成批次, 分配给GPCs{ ? })->
+	SM的多边形引擎(Poly Morph Engine)通过三角形索引获取三角形数据(Vertex Fetch)->
+	SM的Wrap调度(SIMT)->
+![[Pasted image 20230413163234.png]]
+
+	等到wrap完成了vertex-shader的所有指令，三角形会被裁剪然后准备栅格化,GPU会把L1和L2缓存来进行vertex-shader和pixel-shader之间的数据通信
+	SM上的Attribute Setup保证了从vertex-shader来的数据经过插值后是pixel-shade是可读的。
+	光栅化引擎开始接受三角形工作(裁剪、背面剔除、Early-Z剔除)
+	32个线程分成8个2*2的像素块、如果没有三角形覆盖，线程会被遮掩
+	最后会颜色和深度输出到ROP(渲染输出单元)，进行深度测试和framebuffer混合
+
+# 深度测试
+
+### 深度测试失效情况：
+	开启透明测试
+	开启像素摒弃指令 - OpenGL的clip
+	关闭深度测试
+	开启Multi-Sampling：多采样
+
+### 深度测试会导致深度数据冲突
+
+# CPU与GPU异构系统
+	分离
+	耦合
\ No newline at end of file
diff --git a/Pasted image 20230413163234.png b/Pasted image 20230413163234.png
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diff --git a/并行计算/CPU/Brust.md b/并行计算/CPU/Brust.md
new file mode 100644
index 0000000..8d4c92b
--- /dev/null
+++ b/并行计算/CPU/Brust.md
@@ -0,0 +1,2 @@
+
+todo...
\ No newline at end of file
diff --git a/并行计算/CPU/SIMD(单指令多数据).md b/并行计算/CPU/SIMD(单指令多数据).md
new file mode 100644
index 0000000..2bfb5b2
--- /dev/null
+++ b/并行计算/CPU/SIMD(单指令多数据).md
@@ -0,0 +1,11 @@
+
+
+-   一个普通加法指令，一次只能对两个数执行一个加法操作。
+-   一个 SIMD 加法指令，一次可以对两个数组（向量）执行加法操作。
+
+		一个寄存器存多个数据同时批量处理
+
+
+## CSharp中的SIMD
+	位于 System.Numerics 下的Vector即可开始进行硬件级别上的处理
+	Vector<T>.Count为寄存器能容纳的位数
\ No newline at end of file
diff --git a/并行计算/GPU/Compute Shader.md b/并行计算/GPU/Compute Shader.md
new file mode 100644
index 0000000..e69de29
diff --git a/并行计算/GPU/SIMT.md b/并行计算/GPU/SIMT.md
new file mode 100644
index 0000000..ce5e621
--- /dev/null
+++ b/并行计算/GPU/SIMT.md
@@ -0,0 +1,8 @@
+
+
+单指令多线程
+一个指令 会有多条线程运行相同的指令
+英伟达会给出多个修饰符,例如:Bit Mask可以指定哪些线程干活 哪些空转，既可支持分支操作
+每个线程会进入锁步(lock-step)
+线程会进入被遮掩(be masked out)
+被遮掩的原因，例如：if(false) 或者循环次数不一致
\ No newline at end of file
diff --git a/手写渲染器/课程.md b/手写渲染器/课程.md
new file mode 100644
index 0000000..416eab1
--- /dev/null
+++ b/手写渲染器/课程.md
@@ -0,0 +1,2 @@
+
+https://github.com/ssloy/tinyrenderer/wiki/Lesson-0:-getting-started
\ No newline at end of file