Kotlin WIN32 DirectX 9 Off Screen Surface Gradient Direct Pixel Access

Submitted by Dickens A S on Sun, 11/29/2020 - 12:08

Code DirectX 9 using kotlin

Kickstart Kotlin DirectX using WIN32 API's, DirectX SDK 2010

GitHub: https://github.com/dickensas/kotlin-gradle-templates/tree/master/win32-directx

Output window with WIN32 API

Kotlin DirectX 9

Around 150 line of Kotlin code

Kotlin JVM Easy JNI using SWIG and Gradle CPP

Submitted by Dickens A S on Sat, 08/22/2020 - 15:34

This article demonstrates easy way of generating C++ stub code including Java Generation for the corresponding C++ Classes using SWIG

The Gradle KTS project contains a sub module which contains the main source code, the header file and the SWIG file

The Gradle KTS is written in such way it will call the "swig" command line and generates the wrappers and copies the files to corresponding locations

The C++ compiler is auto chosen by Gradle cpp-library plugin, there is no need to write CMake or MakeFile or batch files for that

Kolin Multiplatform Targets NodeJS

Submitted by Dickens A S on Sat, 08/08/2020 - 12:13

Code written in kotlin will get transformed to JavaScript NPM module which can be executed directly from Node.JS

GitHub https://github.com/dickensas/kotlin-gradle-templates/tree/master/js-nodejs

Simple Kotlin code

fun main() {
   println ("hello")

The package.json which is manually created at root folder of the project

Kotlin Web Assembly WebGL Auto Stub

Submitted by Dickens A S on Sat, 05/02/2020 - 05:37

WebGLRenderingContext is a big API, it has 200+ properties and 100+ methods, writing a JavaScript stub and corresponding Kotlin stub is very difficult 

We need to write 1400+ lines of JavaScript code and 3000+ lines Kotlin code

This Kotlin gradle script provides a simple approach to auto generate the stub and also compile the generated code to .klib

Gradle Stub Code in KTS

Kotlin Web Assembly direct buffer access with UTF-16 string

Submitted by Dickens A S on Fri, 05/01/2020 - 06:07

Kotlin WebAssembly runtime provides a global JavaScript array called heap

which can be accessed if the pointer of a variable is known

The pointer and size of the variable can be determined by library methods stringPointer and stringLengthBytes

The from JavaScript the value can be updated with below logic

Kotlin Main Code

Kotlin passing string to Web Assembly

Submitted by Dickens A S on Thu, 04/30/2020 - 14:09

From JavaScript as of now we cannot pass string to WebAssembly, therefore the string will be converted to an array of bytes and kept in browser's memory object of the kotlin web assembly framework object kotlinObject

From WebAssembly by calling the JavaScript method for each character, transfer the numeric value

Then convert the numeric value to character and combine to a string in kotlin

This is achieved using below code

JavaScript: string to UTF array utlity