Add an ability to load binaries from classpath

imgui-binding-natives/build.gradle

@@ -0,0 +1,57 @@
+plugins {
+    id 'java'
+    id 'com.jfrog.bintray' version '1.8.4'
+    id 'maven-publish'
+}
+
+task sourcesJar(type: Jar, dependsOn: classes) {
+    archiveClassifier.set('sources')
+    from sourceSets.main.allSource
+}
+
+def packageName = 'natives-linux'
+def libName = 'libimgui-java64.so'
+
+if (System.getProperty('deployWin32')) {
+    packageName = 'natives-windows-x86'
+    libName = 'imgui-java.dll'
+} else if (System.getProperty('deployWin64')) {
+    packageName = 'natives-windows'
+    libName = 'imgui-java64.dll'
+} else if (System.getProperty('deployLinux32')) {
+    packageName = 'natives-linux-x86'
+    libName = 'libimgui-java.so'
+} else if (System.getProperty('deployLinux64')) {
+    packageName = 'natives-linux'
+    libName = 'libimgui-java64.so'
+}
+
+jar {
+    from('../bin') {
+        include "$libName" // it's ok
+        into 'io/imgui/java/native-bin/'
+    }
+}
+
+publishing {
+    publications {
+        MyPublication(MavenPublication) {
+            from components.java
+            groupId 'io.imgui.java'
+            artifactId packageName
+            artifact sourcesJar
+            version property('version')
+        }
+    }
+}
+
+bintray {
+    user = System.getenv('BINTRAY_USER')
+    key = System.getenv('BINTRAY_API_KEY')
+    publications = ['MyPublication']
+    override = true
+    pkg {
+        repo = 'io.imgui.java'
+        name = packageName
+    }
+}

imgui-binding/build.gradle

@@ -52,14 +52,5 @@ bintray {
     pkg {
         repo = 'io.imgui.java'
         name = 'binding'
-        userOrg = user
-        desc = 'A handcrafted/generated Java binding for the Dear-ImGui'
-        licenses = ['Apache-2.0']
-        websiteUrl = 'https://github.com/SpaiR/imgui-java'
-        issueTrackerUrl  = 'https://github.com/SpaiR/imgui-java/issues'
-        vcsUrl = 'https://github.com/SpaiR/imgui-java.git'
-        labels = ['dear-imgui', 'java', 'jni']
-        githubRepo = 'SpaiR/imgui-java'
-        publicDownloadNumbers = true
     }
 }

imgui-binding/src/main/java/imgui/ImGui.java

@@ -2,11 +2,20 @@ package imgui;
 
 import imgui.enums.ImGuiInputTextFlags;
 
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.UncheckedIOException;
 import java.nio.ByteBuffer;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardCopyOption;
 
 public final class ImGui {
+    private static final String LIB_PATH_PROP = "imgui.library.path";
     private static final String LIB_NAME_PROP = "imgui.library.name";
     private static final String LIB_NAME_DEFAULT = System.getProperty("os.arch").contains("64") ? "imgui-java64" : "imgui-java";
+    private static final String LIB_TMP_DIR_PREFIX = "imgui-java-bin_" + System.getProperty("user.name", "user");
 
     private static final ImDrawData DRAW_DATA = new ImDrawData(100_000, 100_000, 1000);
     private static final ImGuiIO IMGUI_IO = new ImGuiIO();
@@ -17,13 +26,61 @@ public final class ImGui {
     private static final ImDrawList IM_DRAW_LIST_FOREGROUND = new ImDrawList(ImDrawList.TYPE_FOREGROUND);
 
     static {
-        System.loadLibrary(System.getProperty(LIB_NAME_PROP, LIB_NAME_DEFAULT));
-        initJni();
+        final String libPath = System.getProperty(LIB_PATH_PROP);
+        final String libName = System.getProperty(LIB_NAME_PROP, LIB_NAME_DEFAULT);
+        final String fullLibName = resolveFullLibName();
+
+        final String extractedLibAbsPath = tryLoadFromClasspath(fullLibName);
+
+        if (extractedLibAbsPath != null) {
+            System.load(extractedLibAbsPath);
+        } else if (libPath != null) {
+            System.load(Paths.get(libPath).resolve(fullLibName).toFile().getAbsolutePath());
+        } else {
+            System.loadLibrary(libName);
+        }
+
+        nInitJni();
         ImDrawList.nInit();
         ImDrawData.nInit();
         nInitInputTextData();
     }
 
+    private static String resolveFullLibName() {
+        final boolean isWin = System.getProperty("os.name").toLowerCase().contains("win");
+        final String libPrefix;
+        final String libSuffix;
+
+        if (isWin) {
+            libPrefix = "";
+            libSuffix = ".dll";
+        } else { // Only linux as an alternative OS
+            libPrefix = "lib";
+            libSuffix = ".so";
+        }
+
+        return System.getProperty(LIB_NAME_PROP, libPrefix + LIB_NAME_DEFAULT + libSuffix);
+    }
+
+    // This method tries to unpack the library binary from classpath into the temp dir.
+    private static String tryLoadFromClasspath(final String fullLibName) {
+        try (InputStream is = ImGui.class.getClassLoader().getResourceAsStream("io/imgui/java/native-bin/" + fullLibName)) {
+            if (is == null) {
+                return null;
+            }
+
+            final Path tmpDir = Paths.get(System.getProperty("java.io.tmpdir")).resolve(LIB_TMP_DIR_PREFIX);
+            tmpDir.toFile().mkdirs();
+
+            final Path libBin = tmpDir.resolve(fullLibName);
+            Files.copy(is, libBin, StandardCopyOption.REPLACE_EXISTING);
+
+            return libBin.toFile().getAbsolutePath();
+        } catch (IOException e) {
+            throw new UncheckedIOException(e);
+        }
+    }
+
     private ImGui() {
     }
 
@@ -34,7 +91,7 @@ public final class ImGui {
         #include "jni_callbacks.h"
      */
 
-    private static native void initJni(); /*
+    private static native void nInitJni(); /*
         Jni::InitCommon(env);
         Jni::InitCallbacks(env);
     */

imgui-lwjgl3/build.gradle

@@ -63,14 +63,5 @@ bintray {
     pkg {
         repo = 'io.imgui.java'
         name = 'lwjgl3'
-        userOrg = user
-        desc = 'Backend renderer for imgui-java based on LWJGL3'
-        licenses = ['Apache-2.0']
-        websiteUrl = 'https://github.com/SpaiR/imgui-java'
-        issueTrackerUrl  = 'https://github.com/SpaiR/imgui-java/issues'
-        vcsUrl = 'https://github.com/SpaiR/imgui-java.git'
-        labels = ['dear-imgui', 'java', 'lwjgl3', 'opengl']
-        githubRepo = 'SpaiR/imgui-java'
-        publicDownloadNumbers = true
     }
 }

settings.gradle

@@ -1,4 +1,5 @@
 rootProject.name = 'imgui-java'
 include 'imgui-binding'
 include 'imgui-lwjgl3'
+include 'imgui-binding-natives'