Merge WebGPU backend

.gitignore

@@ -139,6 +139,8 @@ generated/
 /java/gradle/build
 /core/examples/build
 /java/gradle/example/.processing
+
+libprocessing/ffi/include/*
 /app/windows/obj
 /java/android/example/build
 /java/android/example/.processing

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "libprocessing"]
+	path = libprocessing
+	url = https://github.com/processing/libprocessing

BUILD.md

@@ -42,22 +42,62 @@ If you don't have them installed, you will need to install [Git](https://git-scm
 
 1. **Clone the repository:**
     ```bash
-    git clone https://github.com/processing/processing4.git
+    git clone --recursive https://github.com/processing/processing4.git
     cd processing4
     ```
 
 2. **Install Temurin JDK 17:**
-    
-    Download and install the appropriate version for your platform:
+
+Processing requires the Temurin distribution of OpenJDK. 
 
-    - [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)
+You can download it from [Adoptium](https://adoptium.net/), from [GitHub releases](https://github.com/adoptium/temurin17-binaries/releases),
+or find it in the package manager for your platform.
+
+### 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`
+
+`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
+./gradlew build -PenableWebGPU=true
+```
 
 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.
+
     ```bash
-    export JAVA_HOME=/path/to/temurin/jdk-17.0.15+6/
+    export JAVA_HOME=/path/to/temurin/jdk-17/
     ```
 
 ### Build, Run, and Package Processing
@@ -138,10 +178,10 @@ If you’re building Processing using IntelliJ IDEA and something’s not workin
 
 ### Use the Correct JDK (temurin-17)
 
-Make sure IntelliJ is using **temurin-17**, not another version. Some users have reported issues with ms-17.
+Make sure IntelliJ is using **temurin-17**, not another version. If building with WebGPU (`-PenableWebGPU=true`), use **temurin-25** instead.
 
 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-17`
 
 ![JDK Selection](.github/media/troubleshooting-Intellij-setting-djk-version-manually.png)
 
@@ -155,7 +195,6 @@ If it is not already installed, you can download it by:
 Now go back to your main window and
 1. Click the green Run Icon in the top right of the window.
 
-
 ### “Duplicate content roots detected”
 
 You may see this warning in IntelliJ:

app/build.gradle.kts

@@ -51,14 +51,17 @@ compose.desktop {
     application {
         mainClass = "processing.app.ProcessingKt"
 
-        jvmArgs(*listOf(
-            Pair("processing.version", rootProject.version),
-            Pair("processing.revision", findProperty("revision") ?: Int.MAX_VALUE),
-            Pair("processing.contributions.source", "https://contributions.processing.org/contribs"),
-            Pair("processing.download.page", "https://processing.org/download/"),
-            Pair("processing.download.latest", "https://processing.org/download/latest.txt"),
-            Pair("processing.tutorials", "https://processing.org/tutorials/"),
-        ).map { "-D${it.first}=${it.second}" }.toTypedArray())
+        jvmArgs(
+            "--enable-native-access=ALL-UNNAMED",  // Required for Java 25 native library access
+            *listOf(
+                Pair("processing.version", rootProject.version),
+                Pair("processing.revision", findProperty("revision") ?: Int.MAX_VALUE),
+                Pair("processing.contributions.source", "https://contributions.processing.org/contribs"),
+                Pair("processing.download.page", "https://processing.org/download/"),
+                Pair("processing.download.latest", "https://processing.org/download/latest.txt"),
+                Pair("processing.tutorials", "https://processing.org/tutorials/"),
+            ).map { "-D${it.first}=${it.second}" }.toTypedArray()
+        )
 
         nativeDistributions{
             modules("jdk.jdi", "java.compiler", "jdk.accessibility", "jdk.zipfs", "java.management.rmi", "java.scripting", "jdk.httpserver")
@@ -432,8 +435,15 @@ tasks.register<Copy>("includeJavaMode") {
     duplicatesStrategy = DuplicatesStrategy.EXCLUDE
     dirPermissions { unix("rwx------") }
 }
+val enableWebGPU = findProperty("enableWebGPU")?.toString()?.toBoolean() ?: false
+
 tasks.register<Copy>("includeJdk") {
-    from(Jvm.current().javaHome.absolutePath)
+    val jdkVersion = if (enableWebGPU) 25 else 17
+    val jdkHome = project.the<JavaToolchainService>().launcherFor {
+        languageVersion.set(JavaLanguageVersion.of(jdkVersion))
+    }.map { it.metadata.installationPath.asFile }
+
+    from(jdkHome)
     destinationDir = composeResources("jdk").get().asFile
 
     fileTree(destinationDir).files.forEach { file ->
@@ -516,7 +526,7 @@ tasks.register("includeProcessingResources"){
     finalizedBy("signResources")
 }
 
-tasks.register("signResources"){
+tasks.register("signResources") {
     onlyIf {
         OperatingSystem.current().isMacOsX
             &&
@@ -561,10 +571,11 @@ tasks.register("signResources"){
             exclude("*.jar")
             exclude("*.so")
             exclude("*.dll")
-        }.forEach{ file ->
-            exec {
-                commandLine("codesign", "--timestamp", "--force", "--deep","--options=runtime", "--sign", "Developer ID Application", file)
-            }
+        }.forEach{ f ->
+            ProcessBuilder("codesign", "--timestamp", "--force", "--deep", "--options=runtime", "--sign", "Developer ID Application", f.absolutePath)
+                .inheritIO()
+                .start()
+                .waitFor()
         }
         jars.forEach { file ->
             FileOutputStream(File(file.parentFile, file.nameWithoutExtension)).use { fos ->

build.gradle.kts

@@ -12,6 +12,35 @@ 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
+}
+
+allprojects {
+    tasks.withType<JavaCompile>().configureEach {
+        sourceCompatibility = javaVersion
+        targetCompatibility = javaVersion
+    }
+
+    tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile>().configureEach {
+        compilerOptions {
+            jvmTarget.set(kotlinJvmTarget)
+        }
+    }
+
+    plugins.withType<JavaPlugin> {
+        extensions.configure<JavaPluginExtension> {
+            toolchain {
+                languageVersion.set(JavaLanguageVersion.of(javaVersion.toInt()))
+            }
+        }
+    }
+}
+
 // Configure the dependencyUpdates task
 tasks {
     dependencyUpdates {

buildSrc/build.gradle.kts

@@ -0,0 +1,7 @@
+plugins {
+    `kotlin-dsl`
+}
+
+repositories {
+    mavenCentral()
+}

buildSrc/src/main/kotlin/processing/gradle/CargoBuildTask.kt

@@ -0,0 +1,56 @@
+package processing.gradle
+
+import org.gradle.api.DefaultTask
+import org.gradle.api.file.DirectoryProperty
+import org.gradle.api.file.RegularFileProperty
+import org.gradle.api.provider.Property
+import org.gradle.api.tasks.*
+import org.gradle.process.ExecOperations
+import javax.inject.Inject
+
+abstract class CargoBuildTask : DefaultTask() {
+
+    @get:Inject
+    abstract val execOperations: ExecOperations
+
+    @get:InputDirectory
+    abstract val cargoWorkspaceDir: DirectoryProperty
+
+    @get:Input
+    abstract val manifestPath: Property<String>
+
+    @get:Input
+    abstract val release: Property<Boolean>
+
+    @get:Input
+    abstract val cargoPath: Property<String>
+
+    @get:OutputFile
+    abstract val outputLibrary: RegularFileProperty
+
+    init {
+        group = "rust"
+        description = "Builds Rust library using cargo"
+
+        // release by default
+        release.convention(true)
+    }
+
+    @TaskAction
+    fun build() {
+        val buildType = if (release.get()) "release" else "debug"
+        logger.lifecycle("Building Rust library ($buildType mode)...")
+
+        val args = mutableListOf("build")
+        if (release.get()) {
+            args.add("--release")
+        }
+        args.add("--manifest-path")
+        args.add(manifestPath.get())
+
+        execOperations.exec {
+            workingDir = cargoWorkspaceDir.get().asFile
+            commandLine = listOf(cargoPath.get()) + args
+        }
+    }
+}

buildSrc/src/main/kotlin/processing/gradle/CargoCleanTask.kt

@@ -0,0 +1,38 @@
+package processing.gradle
+
+import org.gradle.api.DefaultTask
+import org.gradle.api.file.DirectoryProperty
+import org.gradle.api.provider.Property
+import org.gradle.api.tasks.*
+import org.gradle.process.ExecOperations
+import javax.inject.Inject
+
+abstract class CargoCleanTask : DefaultTask() {
+
+    @get:Inject
+    abstract val execOperations: ExecOperations
+
+    @get:InputDirectory
+    abstract val cargoWorkspaceDir: DirectoryProperty
+
+    @get:Input
+    abstract val manifestPath: Property<String>
+
+    @get:Input
+    abstract val cargoPath: Property<String>
+
+    init {
+        group = "rust"
+        description = "Cleans Rust build artifacts"
+    }
+
+    @TaskAction
+    fun clean() {
+        logger.lifecycle("Cleaning Rust build artifacts...")
+
+        execOperations.exec {
+            workingDir = cargoWorkspaceDir.get().asFile
+            commandLine(cargoPath.get(), "clean", "--manifest-path", manifestPath.get())
+        }
+    }
+}

buildSrc/src/main/kotlin/processing/gradle/DownloadJextractTask.kt

@@ -0,0 +1,60 @@
+package processing.gradle
+
+import org.gradle.api.DefaultTask
+import org.gradle.api.GradleException
+import org.gradle.api.file.DirectoryProperty
+import org.gradle.api.file.RegularFileProperty
+import org.gradle.api.provider.Property
+import org.gradle.api.tasks.*
+import java.net.URI
+
+abstract class DownloadJextractTask : DefaultTask() {
+
+    @get:Input
+    abstract val jextractVersion: Property<String>
+
+    @get:Input
+    abstract val platform: Property<String>
+
+    @get:OutputDirectory
+    abstract val jextractDir: DirectoryProperty
+
+    @get:Internal
+    abstract val downloadTarball: RegularFileProperty
+
+    init {
+        group = "rust"
+        description = "Downloads and extracts jextract for the current platform"
+    }
+
+    @TaskAction
+    fun download() {
+        val version = jextractVersion.get()
+        val plat = platform.get()
+        val fileName = "openjdk-$version" + "_${plat}_bin.tar.gz"
+        val downloadUrl = "https://download.java.net/java/early_access/jextract/22/6/$fileName"
+        val tarFile = downloadTarball.get().asFile
+
+        if (!tarFile.exists()) {
+            logger.lifecycle("Downloading jextract from $downloadUrl")
+            try {
+                tarFile.outputStream().use { output ->
+                    URI.create(downloadUrl).toURL().openStream().use { input ->
+                        input.copyTo(output)
+                    }
+                }
+            } catch (e: Exception) {
+                throw GradleException("Failed to download jextract: ${e.message}", e)
+            }
+        }
+
+        val extractDir = jextractDir.get().asFile
+        logger.lifecycle("Extracting jextract to ${extractDir.parent}")
+        project.copy {
+            from(project.tarTree(tarFile))
+            into(extractDir.parent)
+        }
+
+        logger.lifecycle("jextract extracted to: $extractDir")
+    }
+}