Add GLViewport integrating canvas, camera, picking and overlay

CityDoctorParent/Extensions/CityDoctorGUI/src/main/java/de/hft/stuttgart/citydoctor2/gui/gl/GLViewport.java

+package de.hft.stuttgart.citydoctor2.gui.gl;
+
+import com.huskerdev.grapl.gl.GLProfile;
+import com.huskerdev.openglfx.canvas.GLCanvas;
+import com.huskerdev.openglfx.jogl.JOGLExecutor;
+import com.huskerdev.openglfx.jogl.events.JOGLRenderEvent;
+import com.jogamp.opengl.GL;
+import com.jogamp.opengl.GL3;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.function.Consumer;
+import javafx.application.Platform;
+import javafx.scene.input.MouseButton;
+import javafx.scene.paint.Color;
+
+/** OpenGL viewport embedded in JavaFX via openglfx. Replaces the legacy SubScene. */
+public class GLViewport {
+
+    private static final Color BACKGROUND = Color.AZURE;
+
+    private final GLCanvas canvas;
+    private final OrbitCamera camera = new OrbitCamera();
+    private final GlScene scene = new GlScene();
+    private final PickingFramebuffer picking = new PickingFramebuffer();
+    private final HighlightOverlay overlay = new HighlightOverlay();
+
+    private ShaderProgram sceneProgram;
+    private ShaderProgram pickProgram;
+    private boolean initialized;
+
+    // state set off-thread, consumed in render callback
+    private final AtomicReference<SceneData> pendingScene = new AtomicReference<>();
+    private final AtomicReference<int[]> pendingIndexSet = new AtomicReference<>();
+    private volatile int selectedId = 0;
+    private volatile boolean wireframe = false;
+    private volatile boolean cull = false;
+    private volatile float pointScale = 5f;
+
+    // highlight marker data, uploaded on the GL thread when dirty
+    private volatile float[] hlPoints = new float[0];
+    private volatile float[] hlPointColors = new float[0];
+    private volatile float[] hlLines = new float[0];
+    private volatile float[] hlLineColors = new float[0];
+    private volatile boolean highlightsDirty = false;
+
+    // pick request: screen coords + callback (invoked on FX thread with resolved Object or null)
+    private volatile int[] pickRequest;
+    private volatile Consumer<Object> pickCallback;
+    private SceneData currentScene;
+
+    // drag state
+    private double lastX;
+    private double lastY;
+
+    public GLViewport() {
+        canvas = new GLCanvas(new JOGLExecutor(), GLProfile.CORE);
+        canvas.addOnInitEvent(ev -> initialized = false);
+        canvas.addOnRenderEvent(ev -> render((JOGLRenderEvent) ev));
+        canvas.addOnReshapeEvent(ev -> { /* aspect handled per-frame from width/height */ });
+        installInputHandlers();
+    }
+
+    public GLCanvas getNode() { return canvas; }
+
+    // ---- public API (called from FX / worker threads) ----
+
+    public void setScene(SceneData data) { pendingScene.set(data); canvas.repaint(); }
+
+    public void setIndexSet(int[] indices) { pendingIndexSet.set(indices); canvas.repaint(); }
+
+    public void setSelectedId(int id) { selectedId = id; canvas.repaint(); }
+
+    public void setWireframe(boolean on) { wireframe = on; canvas.repaint(); }
+
+    public void setCulling(boolean on) { cull = on; canvas.repaint(); }
+
+    public void setPointScale(float scale) { pointScale = scale; canvas.repaint(); }
+
+    /** points: xyz, pointColors rgb-per-point; lines: xyz pairs, lineColors rgb-per-line-vertex. */
+    public void setHighlights(float[] points, float[] pointColors, float[] lines, float[] lineColors) {
+        this.hlPoints = points;
+        this.hlPointColors = pointColors;
+        this.hlLines = lines;
+        this.hlLineColors = lineColors;
+        this.highlightsDirty = true;
+        canvas.repaint();
+    }
+
+    public OrbitCamera camera() { return camera; }
+
+    public void requestPick(double x, double y, Consumer<Object> callback) {
+        pickRequest = new int[]{(int) Math.round(x), (int) Math.round(y)};
+        pickCallback = callback;
+        canvas.repaint();
+    }
+
+    // ---- render callback (GL thread) ----
+
+    private void render(JOGLRenderEvent ev) {
+        GL3 gl = ev.getGl();
+        int w = ev.width;
+        int h = ev.height;
+        int defaultFbo = ev.fbo;
+
+        if (!initialized) {
+            sceneProgram = new ShaderProgram(gl, "scene.vert", "scene.frag");
+            pickProgram = new ShaderProgram(gl, "pick.vert", "pick.frag");
+            overlay.init(gl);
+            gl.glEnable(GL.GL_DEPTH_TEST);
+            initialized = true;
+        }
+
+        SceneData newScene = pendingScene.getAndSet(null);
+        if (newScene != null) {
+            scene.upload(gl, newScene);
+            currentScene = newScene;
+        }
+        int[] newIndices = pendingIndexSet.getAndSet(null);
+        if (newIndices != null) {
+            scene.setIndexSet(gl, newIndices);
+        }
+        if (highlightsDirty) {
+            overlay.setPoints(gl, hlPoints, hlPointColors);
+            overlay.setLines(gl, hlLines, hlLineColors);
+            highlightsDirty = false;
+        }
+
+        camera.setAspect(h == 0 ? 1f : (float) w / h);
+        float[] mvp = camera.viewProjection();
+
+        gl.glBindFramebuffer(GL.GL_FRAMEBUFFER, defaultFbo);
+        gl.glViewport(0, 0, w, h);
+        gl.glClearColor((float) BACKGROUND.getRed(), (float) BACKGROUND.getGreen(),
+                (float) BACKGROUND.getBlue(), 1f);
+        gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
+        if (cull) {
+            gl.glEnable(GL.GL_CULL_FACE);
+        } else {
+            gl.glDisable(GL.GL_CULL_FACE);
+        }
+        gl.glPolygonMode(GL.GL_FRONT_AND_BACK, wireframe ? GL3.GL_LINE : GL3.GL_FILL);
+
+        sceneProgram.use(gl);
+        gl.glUniformMatrix4fv(sceneProgram.uniform(gl, "uMVP"), 1, false, mvp, 0);
+        gl.glUniform1i(sceneProgram.uniform(gl, "uSelectedId"), selectedId);
+        scene.draw(gl);
+        overlay.draw(gl, pointScale);
+
+        int[] req = pickRequest;
+        if (req != null && currentScene != null) {
+            picking.resize(gl, w, h);
+            picking.bind(gl);
+            gl.glClearColor(0, 0, 0, 1);
+            gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
+            gl.glPolygonMode(GL.GL_FRONT_AND_BACK, GL3.GL_FILL);
+            pickProgram.use(gl);
+            gl.glUniformMatrix4fv(pickProgram.uniform(gl, "uMVP"), 1, false, mvp, 0);
+            scene.draw(gl);
+            int id = picking.readId(gl, req[0], req[1]);
+            Object target = currentScene.pickRegistry().resolve(id);
+            selectedId = (target != null) ? id : 0;
+            Consumer<Object> cb = pickCallback;
+            pickRequest = null;
+            pickCallback = null;
+            gl.glBindFramebuffer(GL.GL_FRAMEBUFFER, defaultFbo);
+            if (cb != null) {
+                Platform.runLater(() -> cb.accept(target));
+            }
+        }
+    }
+
+    // ---- input ----
+
+    private void installInputHandlers() {
+        canvas.setOnMousePressed(e -> { lastX = e.getX(); lastY = e.getY(); });
+        canvas.setOnMouseDragged(e -> {
+            double dx = e.getX() - lastX;
+            double dy = e.getY() - lastY;
+            lastX = e.getX();
+            lastY = e.getY();
+            if (e.getButton() == MouseButton.PRIMARY) {
+                camera.orbit(dx / 3.0, dy / 3.0);
+            } else if (e.getButton() == MouseButton.SECONDARY) {
+                double speed = Math.abs(camera.distance()) / 1000.0;
+                camera.pan(-dx * speed, dy * speed);
+            }
+            canvas.repaint();
+        });
+        canvas.setOnScroll(e -> {
+            camera.zoom(e.getDeltaY() < 0 ? 1.05 : 0.95);
+            canvas.repaint();
+        });
+    }
+
+    public void resetCamera() { camera.reset(); canvas.repaint(); }
+}