Build updates for v5

.github/actions/setup/action.yml

@@ -10,9 +10,12 @@ runs:
     - name: Install Java
       uses: actions/setup-java@v4
       with:
-        java-version: '17'
+        java-version: '25'
         distribution: 'temurin'
         architecture: ${{ inputs.arch }}
 
+    - name: Install Rust
+      uses: dtolnay/rust-toolchain@stable
+
     - name: Setup Gradle
       uses: gradle/actions/setup-gradle@v4

.github/workflows/build.yml

@@ -18,6 +18,8 @@ jobs:
     steps:
       - name: Checkout Repository
         uses: actions/checkout@v4
+        with:
+          submodules: recursive
 
       - name: Setup Processing
         uses: ./.github/actions/setup
@@ -70,6 +72,8 @@ jobs:
     steps:
       - name: Checkout Repository
         uses: actions/checkout@v4
+        with:
+          submodules: recursive
 
       - name: Setup Processing
         uses: ./.github/actions/setup

.github/workflows/release.yml

@@ -109,6 +109,8 @@ jobs:
     steps:
     - name: Checkout Repository
       uses: actions/checkout@v4
+      with:
+        submodules: recursive
 
     - name: Setup Processing
       uses: ./.github/actions/setup
@@ -137,6 +139,8 @@ jobs:
     steps:
       - name: Checkout Repository
         uses: actions/checkout@v4
+        with:
+          submodules: recursive
 
       - name: Setup Processing
         uses: ./.github/actions/setup
@@ -183,6 +187,8 @@ jobs:
     steps:
       - name: Checkout Repository
         uses: actions/checkout@v4
+        with:
+          submodules: recursive
 
       - name: Setup Processing
         uses: ./.github/actions/setup
@@ -249,6 +255,8 @@ jobs:
 
       - name: Checkout Repository
         uses: actions/checkout@v4
+        with:
+          submodules: recursive
 
       - name: Setup Processing
         uses: ./.github/actions/setup
@@ -304,6 +312,8 @@ jobs:
     steps:
       - name: Checkout Repository
         uses: actions/checkout@v4
+        with:
+          submodules: recursive
 
       - name: Setup Processing
         uses: ./.github/actions/setup

BUILD.md

@@ -7,30 +7,24 @@ Great to see you are interested in contributing to Processing. To get started yo
 _**Note:** A paid subscription is **not** required. Everything needed to build and work on Processing is available for free in IntelliJ IDEA._
 
 1. [Download IntelliJ IDEA](https://www.jetbrains.com/idea/download/) and install it.
-1. Clone the `Processing4` repository locally.
+1. Install [Rust](https://rustup.rs/). It is needed to build `libprocessing`, the native library behind the WebGPU renderer.
+1. Clone the `processing4` repository locally, including its submodules (`git clone --recursive`, or `git submodule update --init --recursive` in an existing clone).
 1. Open the cloned repository in **IntelliJ IDEA**.
 1. When prompted, select **Trust Project**. (You can preview the project in Safe Mode, but you will not be able to build Processing.)
 1. If IntelliJ asks whether to import the Gradle project, select **Load Gradle Project**.
-1. Make sure IntelliJ and Gradle are both using **JDK 17**:
+1. Make sure IntelliJ and Gradle are both using **JDK 25**:
    * Go to **`File > Project Structure > Project`**
-   * Set **Project SDK** to **JDK 17** (we recommend **Eclipse Temurin**)
-   * If needed, choose **Download JDK…** and install **Version 17**
+   * Set **Project SDK** to **JDK 25** (we recommend **Eclipse Temurin**)
+   * If needed, choose **Download JDK…** and install **Version 25**
    * Then go to **`Settings > Build, Execution, Deployment > Build Tools > Gradle`**
-   * Set **Gradle JVM** to the same **JDK 17**
+   * Set **Gradle JVM** to the same **JDK 25** (the project requests 25 in `gradle/gradle-daemon-jvm.properties`, so this is usually picked automatically)
 1. Wait for Gradle sync to finish.
 1. Click the green **Run** button in the top right to build and launch Processing. You can also use this menu to start a debug session.
 
 > [!TIP]
 > If you encounter any issues with this process, Read the [Troubleshooting and Setup Tips for IntelliJ IDEA](#troubleshooting-and-setup-tips-intellij-idea)
 
-1. Clone the Processing4 repository to your machine locally
-1. Open the cloned repository in IntelliJ IDEA CE
-1. When prompted, select **Trust Project**. You can preview the project in Safe Mode but you won't be able to build Processing.
-1. IntelliJ may ask if you want to load Gradle project. If you allow this, make sure you are using JDK version 17.
-1. In the main menu, go to File > Project Structure > Project Settings > Project.
-1. In the SDK Dropdown option, select a JDK version 17 or Download the jdk
-1. Click the green Run Icon in the top right of the window. This is also where you can find the option to debug Processing. 
-1. Logs can be found in the `Build` or `Debug` pane on the bottom left of the window
+Logs can be found in the `Build` or `Debug` pane on the bottom left of the window.
 
 
 ## VSCode
@@ -52,69 +46,37 @@ If you prefer not to use an IDE, you can also build Processing directly from the
 
 ### Set Up the Environment
 
-If you don't have them installed, you will need to install [Git](https://git-scm.com/downloads) and [Gradle](https://gradle.org/install/) first. Then follow these steps:
+If you don't have them installed, you will need to install [Git](https://git-scm.com/downloads), [Gradle](https://gradle.org/install/) and [Rust](https://rustup.rs/) first. Then follow these steps:
 
 1. **Clone the repository:**
     ```bash
     git clone --recursive https://github.com/processing/processing4.git
     cd processing4
     ```
 
-2. **Install Temurin JDK 17:**
+2. **Install Temurin JDK 25:**
 
-    Download and install the appropriate version for your platform:
-
-    - [Linux (x86)](https://github.com/adoptium/temurin17-binaries/releases/download/jdk-17.0.15%2B6/OpenJDK17U-jdk_x64_linux_hotspot_17.0.15_6.tar.gz)
-    - [macOS (Apple Silicon)](https://github.com/adoptium/temurin17-binaries/releases/download/jdk-17.0.15%2B6/OpenJDK17U-jdk_aarch64_mac_hotspot_17.0.15_6.pkg)
-    - [Other platforms](https://adoptium.net/temurin/releases/?package=jdk&version=17&os=any&arch=any)
-
-### macOS:
-```bash
-brew install --cask temurin@17
-````
-
-### Windows (using winget):
-```bash
-winget install --id=EclipseAdoptium.Temurin.17.JDK  -e
-```
-
-### SDKMAN!
-
-[SDKMAN!](https://sdkman.io/) is a useful tool for developers working on multiple versions of the JVM.
-
-## WebGPU Support (Optional)
-
-To build Processing with the experimental WebGPU renderer, you need JDK 25, Rust, and jextract.
-
-### Install Temurin JDK 25
-
-```bash
-brew install --cask temurin@25    # macOS
-```
-
-### Install `jextract`
+    Download and install the appropriate version for your platform from [Adoptium](https://adoptium.net/temurin/releases/?package=jdk&version=25&os=any&arch=any), or use a package manager:
 
-`jextract` generates Java bindings from C header files.
-You can download it [here](https://jdk.java.net/jextract/) or install it using SDKMAN!:
-
-```bash
-sdk install jextract
-````
-
-### Build with WebGPU
+    ```bash
+    brew install --cask temurin@25                         # macOS
+    winget install --id=EclipseAdoptium.Temurin.25.JDK -e  # Windows
+    ```
 
-```bash
-./gradlew build -PenableWebGPU=true
-```
+    [SDKMAN!](https://sdkman.io/) is also a useful tool for developers working on multiple versions of the JVM.
 
 3. **Set the `JAVA_HOME` environment variable:**
 
-It may be necessary to set the `JAVA_HOME` environment variable to point to your Temurin JDK installation.
+    It may be necessary to set the `JAVA_HOME` environment variable to point to your Temurin JDK installation.
 
     ```bash
-    export JAVA_HOME=/path/to/temurin/jdk-17.0.15+6/
+    export JAVA_HOME=/path/to/temurin/jdk-25/
     ```
 
+4. **(Optional) Install `jextract`:**
+
+    `jextract` generates the Java bindings for `libprocessing`. The build downloads it automatically, but if you already have it installed (for example with `sdk install jextract`), that copy will be used instead.
+
 ### Build, Run, and Package Processing
 
 #### Build the Project (Required First Step)
@@ -191,18 +153,18 @@ If you are specifically trying to run the `Processing CLI`, you can test command
 
 If you’re building Processing using IntelliJ IDEA and something’s not working, here are a few things that might help:
 
-### Use the Correct JDK (temurin-17)
+### Use the Correct JDK (temurin-25)
 
-Make sure IntelliJ is using **temurin-17**, not another version. If building with WebGPU (`-PenableWebGPU=true`), use **temurin-25** instead.
+Make sure IntelliJ is using **temurin-25**, not another version.
 
 1. Go to **File > Project Structure > Project**
-2. Set the **Project SDK** to:    `temurin-17 java version "17.0.15"`
+2. Set the **Project SDK** to:    `temurin-25 java version "25"`
 
 ![JDK Selection](.github/media/troubleshooting-Intellij-setting-djk-version-manually.png)
 
 If it is not already installed, you can download it by:
 1. Clicking the SDK input field and then selecting the `Download JDK...` option from the menu
-2. Select Version: `17`, Vendor: `Eclipse Temurin (AdoptOpenJDK HotSpot)`
+2. Select Version: `25`, Vendor: `Eclipse Temurin (AdoptOpenJDK HotSpot)`
 
 <img width="400" alt="JDK Download" src="https://github.com/user-attachments/assets/503a03a4-3e53-4406-9641-2c93e4b45d51" />
 
@@ -212,6 +174,15 @@ Now go back to your main window and
 1. Click the green Run Icon in the top right of the window.
 
 
+### “libprocessing submodule directory not found”
+
+The `libprocessing` submodule hasn't been checked out. Run:
+
+```bash
+git submodule update --init --recursive
+```
+
+
 ### “Duplicate content roots detected”
 
 You may see this warning in IntelliJ:

app/build.gradle.kts

@@ -142,6 +142,7 @@ dependencies {
     @OptIn(ExperimentalComposeLibrary::class)
     testImplementation(compose.uiTest)
     testImplementation(kotlin("test"))
+    testImplementation(libs.mockito)
     testImplementation(libs.mockitoKotlin)
     testImplementation(libs.junitJupiter)
     testImplementation(libs.junitJupiterParams)
@@ -442,10 +443,8 @@ tasks.register<Copy>("includeJavaMode") {
     into(composeResources("modes/java/mode"))
     duplicatesStrategy = DuplicatesStrategy.EXCLUDE
 }
-val enableWebGPU = findProperty("enableWebGPU")?.toString()?.toBoolean() ?: false
-
 tasks.register<Copy>("includeJdk") {
-    val jdkVersion = if (enableWebGPU) 25 else 17
+    val jdkVersion = 25
     val jdkHome = project.the<JavaToolchainService>().launcherFor {
         languageVersion.set(JavaLanguageVersion.of(jdkVersion))
     }.map { it.metadata.installationPath.asFile }

build.gradle.kts

@@ -12,13 +12,8 @@ plugins {
 // Can be deleted after the migration to Gradle is complete
 layout.buildDirectory = file(".build")
 
-val enableWebGPU = findProperty("enableWebGPU")?.toString()?.toBoolean() ?: false
-val javaVersion = if (enableWebGPU) "25" else "17"
-val kotlinJvmTarget = if (enableWebGPU) {
-    org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_25
-} else {
-    org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_17
-}
+val javaVersion = "25"
+val kotlinJvmTarget = org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_25
 
 allprojects {
     tasks.withType<JavaCompile>().configureEach {