Initial commit

Author: adamaq01

build.gradle

@@ -0,0 +1,19 @@
+plugins {
+    id 'java'
+}
+
+group 'fr.adamaq01'
+version '1.0.0'
+
+sourceCompatibility = 1.8
+
+project.ext.lwjglVersion = "3.2.2"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    compile "org.lwjgl:lwjgl:$lwjglVersion"
+    compile "org.lwjgl:lwjgl-opengl:$lwjglVersion"
+}

gradle/wrapper/gradle-wrapper.jar

@@ -0,0 +1,6 @@
+#Wed Jul 10 22:14:15 CEST 2019
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.3-all.zip

gradle/wrapper/gradle-wrapper.properties

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+rootProject.name = 'java-osmesa'
+

gradlew

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+package fr.adamaq01.osmesa;
+
+import org.lwjgl.system.Library;
+import org.lwjgl.system.MemoryUtil;
+import org.lwjgl.system.SharedLibrary;
+import org.lwjgl.system.dyncall.DynCall;
+
+import java.nio.ByteBuffer;
+import java.nio.IntBuffer;
+import java.util.HashMap;
+
+public class OSMesa {
+
+    protected static final SharedLibrary OSMESA;
+    protected static final HashMap<Long, OSMesaContext> CONTEXTS;
+
+    static {
+        OSMESA = Library.loadNative("OSMesa");
+        CONTEXTS = new HashMap<>();
+    }
+
+    public static final int OSMESA_ROW_LENGTH = 0x10;
+    public static final int OSMESA_Y_UP = 0x11;
+    public static final int OSMESA_WIDTH = 0x20;
+    public static final int OSMESA_HEIGHT = 0x21;
+    public static final int OSMESA_FORMAT = 0x22;
+    public static final int OSMESA_TYPE = 0x23;
+    public static final int OSMESA_MAX_WIDTH = 0x24;
+    public static final int OSMESA_MAX_HEIGHT = 0x25;
+
+    public static OSMesaContext createContext(OSMesaFormat format) {
+        long vm = DynCall.dcNewCallVM(128);
+        DynCall.dcArgInt(vm, format.getGlId());
+        DynCall.dcArgPointer(vm, MemoryUtil.NULL);
+        long pointer = DynCall.dcCallPointer(vm, OSMESA.getFunctionAddress("OSMesaCreateContext"));
+        DynCall.dcFree(vm);
+        if (pointer == 0)
+            throw new RuntimeException("Could not create OSMesaContext !");
+        OSMesaContext context = new OSMesaContext(format, pointer);
+        CONTEXTS.put(pointer, context);
+        return context;
+    }
+
+    public static OSMesaContext createContextExt(OSMesaFormat format, int depthBits, int stencilBits, int accumBits) {
+        long vm = DynCall.dcNewCallVM(128);
+        DynCall.dcArgInt(vm, format.getGlId());
+        DynCall.dcArgInt(vm, depthBits);
+        DynCall.dcArgInt(vm, stencilBits);
+        DynCall.dcArgInt(vm, accumBits);
+        DynCall.dcArgPointer(vm, MemoryUtil.NULL);
+        long pointer = DynCall.dcCallPointer(vm, OSMESA.getFunctionAddress("OSMesaCreateContextExt"));
+        DynCall.dcFree(vm);
+        if (pointer == 0)
+            throw new RuntimeException("Could not create OSMesaContext !");
+        OSMesaContext context = new OSMesaContext(format, pointer);
+        CONTEXTS.put(pointer, context);
+        return context;
+    }
+
+    public static void destroyContext(OSMesaContext context) {
+        context.destroy();
+    }
+
+    public static ByteBuffer makeContextCurrent(OSMesaContext context, int width, int height) {
+        return context.makeCurrent(width, height);
+    }
+
+    public static OSMesaContext getCurrentContext() {
+        long vm = DynCall.dcNewCallVM(64);
+        long pointer = DynCall.dcCallPointer(vm, OSMESA.getFunctionAddress("OSMesaGetCurrentContext"));
+        DynCall.dcFree(vm);
+        if (pointer == 0)
+            throw new RuntimeException("Could not get current OSMesaContext !");
+        OSMesaContext context = CONTEXTS.get(pointer);
+        if (context == null) {
+            context = new OSMesaContext(OSMesaFormat.fromGlId(getIntegerv(OSMESA_FORMAT)), pointer);
+            CONTEXTS.put(pointer, context);
+        }
+        return context;
+    }
+
+    public static int getIntegerv(int property) {
+        IntBuffer value = MemoryUtil.memAllocInt(1);
+        long vm = DynCall.dcNewCallVM(128);
+        DynCall.dcArgInt(vm, property);
+        DynCall.dcArgPointer(vm, MemoryUtil.memAddress(value));
+        DynCall.dcCallVoid(vm, OSMesa.OSMESA.getFunctionAddress("OSMesaGetIntegerv"));
+        DynCall.dcFree(vm);
+        return value.get(0);
+    }
+}