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RSS订阅原创 Advanced Pathtracer with MIS
Advanced Pathtracer with MISIntroductionDirect/Indirect Separation (Next Event Estimation)Russian RouletteTheoryImplementationImportance SamplingConstant pdfCosine pdfModified Phong BRDFGGX Microfacet BRDFHalf VectorMicrofacet Distribution Function (D)Shad
2020-11-29 17:03:59
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原创 Accelerating Program Based on Architecture From Software Level
Note: Before start optimization, use profiler such as gprof to determine the function that consumes the most percentage of time. gprof does not work with multithreading enabled.Increasing IPC (Instru...
2020-03-20 05:03:56
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原创 `and` keyword in OCaml
A construction likelet rec f ... = ...and g ... = ....allows f and g to be mutually recursive (if they were separate let recs, g could refer to f but not vice versa.)That is, in the caselet rec ...
2019-10-08 13:49:27
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原创 `option` keyword in OCaml
Error HandlingA common way of handling failure that we’ve already seen is raising exceptions with failwith.For example:let rec find (l : 'a list) (pred : 'a -> bool) : 'a = match l with | ...
2019-10-02 11:40:49
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原创 Effective C++: Item 48 -- Be aware of template metaprogramming (TMP)
DefinitionTemplate metaprogramming (TMP) is the process of writing template-based C++ programs that execute during compilation. Think about that for a minute: a template metaprogram is a program writ...
2019-09-10 12:01:18
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原创 Effective C++: Item 47 -- Use traits classes for information about types(check type in compile time)
Mini-review on STL Iterator Category5 categories of iterators:Input iterators can move only forward, can move only one step at a time, can only read what they point to, and can read what they’re po...
2019-09-04 11:10:38
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原创 How to store data that can be used by another class?
ProblemBased on the One Responsibility Principle, we usually want the data as a separate component from the implementation class. This implys an “is implemented in terms of” relationship.Implement t...
2019-09-03 20:55:49
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原创 Effective C++: Item 46:Define non-member functions inside templates when type conversions are desire
ExampleModification on example from Item 24.template<typename T>class Rational { public: Rational(const T& numerator = 0, // see Item 20 for why params const T& denominator =...
2019-09-03 11:59:17
170
转载 怎样理解C / C++复杂变量声明 -- "right-left" rule
The “right-left” rule is a completely regular rule for deciphering Cdeclarations. It can also be useful in creating them.First, symbols. Read * as "pointer to" - always on the left side ...
2019-09-02 18:18:10
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原创 Effective C++: Item 45 -- Use member function templates to accept “all compatible types.”
SmartPtr exampleSmart pointers are objects that act much like pointers but add functionality pointers don’t provide. However, one of the things that real pointers do well is support implicit conversi...
2019-09-02 10:55:49
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原创 Effective C++: Item 44 -- Factor parameter-independent code out of templates
Problem:Using templates can lead to code bloat: binaries with replicated (or almost replicated) code, data, or both.The result can be source code that looks fit and trim, yet object code that’s fat ...
2019-08-30 11:26:08
249
转载 WebGL canvas size vs. CSS size vs. viewport vs. clipspace vs. world space
There are lots of different widths and heights in WebGL! This post tries to clarify the pipeline which transforms your world coordinates into physical pixels. Start with a canvas:<canvas id="foo" ...
2019-08-29 16:30:11
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转载 Texture Filtering in OpenGL
WHAT IS TEXTURE FILTERING?Textures in OpenGL are made up of arrays of elements known as texels, which contain colour and alpha values. This corresponds with the display, which is made up of a bunch o...
2019-08-29 15:59:41
384
原创 C++隐式转换与explicit关键字
隐式转换定义Implicit conversions are performed whenever an expression of some type T1 is used in context that does not accept that type, but accepts some other type T2; in particular:when the expression ...
2019-08-29 12:14:25
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原创 Effective C++: Item 43 -- Know how to access names in templatized base classes.
Problem: Unable to access names in templatized base classIn example:class CompanyA { public: ... void sendCleartext(const std::string& msg); void sendEncrypted(const std::string& msg); ...
2019-08-29 10:59:13
193
原创 Forward Declare an Enum (error: ISO C++ forbids forward references to 'enum' types)
注： 此为英文笔记，如需翻译请私信或留评论To declare an Enum, this way won’t work. The compiler will throw a compile error since no size is explicitly specified.enum e;void Foo (E e);enum E {A, B, C};Instead, in C...
2019-08-28 19:14:10
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原创 C++ 中多余大括号的用处
问题今天看同事代码的时候见到了一种比较特殊的c++写法。bool test(){ ... \\ Some unrelated code { \\ Some other code ... } \\ Somce unrelated code ...}在代码中有一个多余的大括号，但是不知道是做什么用的，因为他不和前面或后面的任何代码有关。解释这个多余的大括号提供了一个...
2019-08-28 18:23:34
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原创 Effective C++: Item 42 -- Understand the two meanings of typename
Difference between typename and class in template declarationstemplate<class T> class Widget; // uses “class”template<typename T> class Widget; // uses “typename”No difference. When de...
2019-08-28 11:19:10
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原创 Initialize Member Variable Which is an Object
ProblemI have a class with a member as an object of another class. I want to initialize it and use it.class Test {public: TestImpl testImpl;}SolutionUse Guaranteed Initialization (Suggested)c...
2019-08-27 21:06:20
204
原创 Effective C++: Item 41 -- Understand implicit interfaces and compile time polymorphism.
DefinitionThe world of object-oriented programming revolves around explicit interfaces and runtime polymorphism. In the world of templates and generic programming, explicit interfaces and runtime pol...
2019-08-27 11:27:43
217
原创 glsl中lowp, mediump, highp的区别 (Precision Qualifier)
定义浮点数和整数类型的区间和精度取决于数据来源(varying, uniform, texture look-up, etc.)， 是在片元着色器还是在顶点着色器中，及其他细节。Precision Qualifier的用处就是定义一个变量的最小的储存需求。Precision Qualifiers任何浮点数或整数的定义可以由这三个precision qualifier之中的一个定义例子l...
2019-08-26 20:43:53
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原创 C++ 长行字符串多行书写
问题在使用C++编写图形学程序的时候往往会碰到需要将着色器代码变为字符串嵌入代码的情况。如何将着色器代码更简便快捷的用字符串表示出来便成为了一个问题。解决方案使用双引号string testShader = "uniform mat4 g_mvpMatrix; \n" "attribute vec3 position;\n" ...
2019-08-26 17:18:04
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原创 Effective C++: Item 40 -- Use multiple inheritance judiciously
注： 此为英文资料整理，如需翻译请私信或留评论Multiple Inheritance (MI) DefinitionMultiple inheritance just means inheriting from more than one base class, but it is not uncommon for MI to be found in hierarchies that hav...
2019-08-26 11:49:10
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原创 Pure Virtual Function, Abstract Class and Interface in C++
Pure Virtual FunctionA pure virtual function (or abstract function) in C++ is a virtual function for which we don’t have implementation, we only declare it. A pure virtual function is declared by ass...
2019-08-23 17:41:12
225
原创 Forward declare a class which is in a namespace
Normally, we forward declare a class like following.class T1;class T2 { T1* t1; };However, for class which is in a namespace the above way doesn’t work. We need instead:namespace n1 {class T1;...
2019-08-23 16:05:58
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原创 Effective C++: Item 39 -- Use private inheritance judiciously
DefinitionPrivate inheritance doesn’t mean is-a. In contrast to public inheritance, compilers will generally not convert a derived class object into a base class object if the inheritance relationshi...
2019-08-23 11:32:04
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原创 Effective C++: Item 38 -- Model “has-a” or “is-implemented-in-terms- of” through composition
DefinitionComposition is the relationship between types that arises when objects of one type contain objects of another type. Composition is also known as layering, containment, aggrega- tion, and em...
2019-08-22 21:32:08
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原创 Javascript Coercion and Operator Between Non-boolean Values
DefinitionConverting a value from one type to another is often called “type casting,” when done explicitly, and “coercion” when done implicitly (forced by the rules of how a value is used).Another w...
2019-08-22 16:51:51
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翻译 Window.devicePixelRatio 设备像素比
定义设备像素比返回了设备上的物理像素和当前设备CSS像素的一个比值。 这个数值告诉浏览器多少屏幕实际的像素点被用来画了一个CSS像素点。公式表示就是：window.devicePixelRatio = 物理像素 / css像素这个比例常被用来解决标准显示及Retina显示的不同。注意没有办法可以得知这个比值的变化（这可能发生，比如用户将一个窗口拖到另一个显示器中）。 唯一的解决办法就是周...
2019-08-22 16:12:13
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原创 C++ namespace 命名空间
namespace 的作用namespace用于分割项目整个空间，使每一个空间相对独立，虽然相同的名字存在，但是他们处于不同的namespace中，就不会发生命名冲突。全局作用域最大的问题是只有一个。在一个大型项目中，人们经常会重复命名从而导致命名冲突。例子：library1.h might define a number of constants, including the follo...
2019-08-22 12:16:52
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