Refactor: Public *Renderer / Unify Region Demos / Using own Screenshot (non AWT, plain GL2ES2)

Refactor: Public *Renderer
- Sharing common base abstract class Renderer.java
- Having public abstract classes RegionRenderer and TextRenderer
- Implementation non public, accessed via factory

- + shared code
- + clean API (same stuff)

Unify Region Demos

- reduced code / path, sharing common demo/test features Text/Region

Using own Screenshot (non AWT, plain GL2ES2)

- Remove AWT dependency
- Allow GL2ES2 screenshots
- Less complex

1 files changed, 39 insertions, 0 deletions

diff --git a/src/demo/Screenshot.java b/src/demo/Screenshot.java
new file mode 100644
index 000000000..8e05b17ea
--- /dev/null
+++ b/src/demo/Screenshot.java
@@ -0,0 +1,39 @@
+package demo;
+
+import java.io.File;
+import java.io.IOException;
+
+import javax.media.opengl.GL;
+import javax.media.opengl.GLAutoDrawable;
+
+import com.jogamp.opengl.util.texture.TextureIO;
+
+public class Screenshot {
+
+    ReadBufferUtil readBufferUtil = new ReadBufferUtil();
+
+    public void dispose() {
+        readBufferUtil.dispose();
+    }
+
+    public void surface2File(GLAutoDrawable drawable, String filename) {
+        GL gl = drawable.getGL();
+        // FIXME glFinish() is an expensive paranoia sync, should not be necessary due to spec
+        gl.glFinish();
+        readBufferUtil.fetchOffscreenTexture(drawable, gl);
+        gl.glFinish();
+        try {
+            surface2File(filename);
+        } catch (IOException ex) {
+            throw new RuntimeException("can not write survace to file", ex);
+        }
+    }
+
+    void surface2File(String filename) throws IOException {
+        File file = new File(filename);
+        TextureIO.write(readBufferUtil.getTextureData(), file);
+        System.err.println("Wrote: " + file.getAbsolutePath() + ", ...");
+        readBufferUtil.rewindPixelBuffer();
+    }
+    
+}