Ok, I think I got it now. It always confuses me as well...sorry about that. The trick is to make the blitting operations operate on the actual framebuffer size (even when using a render target) and NOT on the ones of the texture. One solution is this dummyWorld-approach, but it wasn't the right place where I putted it. It has to be done BEFORE setting the render target and it's sufficient to do it once. But a better solution is to tell the framebuffer which values to use directly. There's a method for this:
http://www.jpct.net/jpct-ae/doc/com/threed/jpct/FrameBuffer.html#setVirtualDimensions(int, int).
So here's the modified example. If you don't want to use this method, you can still use the dummyWorld-approach: Just replace the call to setVirtualDimensions() with the renderScene()/draw()-sequence.
Hope this helps.
package com.threed.jpct.example;
import java.lang.reflect.Field;
import javax.microedition.khronos.egl.EGL10;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.egl.EGLDisplay;
import javax.microedition.khronos.opengles.GL10;
import android.app.Activity;
import android.opengl.GLSurfaceView;
import android.os.Bundle;
import android.view.MotionEvent;
import com.threed.jpct.Camera;
import com.threed.jpct.Config;
import com.threed.jpct.FrameBuffer;
import com.threed.jpct.Light;
import com.threed.jpct.Logger;
import com.threed.jpct.Object3D;
import com.threed.jpct.Primitives;
import com.threed.jpct.RGBColor;
import com.threed.jpct.SimpleVector;
import com.threed.jpct.Texture;
import com.threed.jpct.TextureManager;
import com.threed.jpct.World;
import com.threed.jpct.util.BitmapHelper;
import com.threed.jpct.util.MemoryHelper;
public class HelloWorld extends Activity {
private static HelloWorld master = null;
private GLSurfaceView mGLView;
private MyRenderer renderer = null;
private FrameBuffer fb = null;
private World world = null;
private RGBColor back = new RGBColor(50, 50, 100);
private float touchTurn = 0;
private float touchTurnUp = 0;
private float xpos = -1;
private float ypos = -1;
private Object3D cube = null;
private int fps = 0;
private boolean gl2 = true;
private Light sun = null;
private Texture target = null;
private Texture target2 = null;
private Texture texture = null;
private boolean firstRun = true;
protected void onCreate(Bundle savedInstanceState) {
Logger.log("onCreate");
if (master != null) {
copy(master);
}
super.onCreate(savedInstanceState);
mGLView = new GLSurfaceView(getApplication());
if (gl2) {
mGLView.setEGLContextClientVersion(2);
} else {
mGLView.setEGLConfigChooser(new GLSurfaceView.EGLConfigChooser() {
public EGLConfig chooseConfig(EGL10 egl, EGLDisplay display) {
int[] attributes = new int[] { EGL10.EGL_DEPTH_SIZE, 16, EGL10.EGL_NONE };
EGLConfig[] configs = new EGLConfig[1];
int[] result = new int[1];
egl.eglChooseConfig(display, attributes, configs, 1, result);
return configs[0];
}
});
}
renderer = new MyRenderer();
mGLView.setRenderer(renderer);
setContentView(mGLView);
}
@Override
protected void onPause() {
super.onPause();
mGLView.onPause();
}
@Override
protected void onResume() {
super.onResume();
mGLView.onResume();
}
@Override
protected void onStop() {
super.onStop();
}
private void copy(Object src) {
try {
Logger.log("Copying data from master Activity!");
Field[] fs = src.getClass().getDeclaredFields();
for (Field f : fs) {
f.setAccessible(true);
f.set(this, f.get(src));
}
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public boolean onTouchEvent(MotionEvent me) {
if (me.getAction() == MotionEvent.ACTION_DOWN) {
xpos = me.getX();
ypos = me.getY();
return true;
}
if (me.getAction() == MotionEvent.ACTION_UP) {
xpos = -1;
ypos = -1;
touchTurn = 0;
touchTurnUp = 0;
return true;
}
if (me.getAction() == MotionEvent.ACTION_MOVE) {
float xd = me.getX() - xpos;
float yd = me.getY() - ypos;
xpos = me.getX();
ypos = me.getY();
touchTurn = xd / -100f;
touchTurnUp = yd / -100f;
return true;
}
try {
Thread.sleep(15);
} catch (Exception e) {
// No need for this...
}
return super.onTouchEvent(me);
}
protected boolean isFullscreenOpaque() {
return true;
}
class MyRenderer implements GLSurfaceView.Renderer {
private long time = System.currentTimeMillis();
public MyRenderer() {
}
public void onSurfaceChanged(GL10 gl, int w, int h) {
if (fb != null) {
fb.dispose();
}
if (gl2) {
fb = new FrameBuffer(w, h); // OpenGL ES 2.0 constructor
} else {
fb = new FrameBuffer(gl, w, h); // OpenGL ES 1.x constructor
}
Config.viewportOffsetY = -0.15f;
if (master == null) {
world = new World();
world.setAmbientLight(20, 20, 20);
sun = new Light(world);
sun.setIntensity(250, 250, 250);
// Create a texture out of the icon...:-)
texture = new Texture(BitmapHelper.rescale(BitmapHelper.convert(getResources().getDrawable(R.drawable.icon)), 64, 64));
TextureManager.getInstance().addTexture("texture", texture);
cube = Primitives.getCube(10);
cube.calcTextureWrapSpherical();
cube.setTexture("texture");
cube.strip();
cube.build();
target = new Texture(256, 256);
target2 = new Texture(256, 256);
world.addObject(cube);
Camera cam = world.getCamera();
cam.moveCamera(Camera.CAMERA_MOVEOUT, 50);
cam.lookAt(cube.getTransformedCenter());
SimpleVector sv = new SimpleVector();
sv.set(cube.getTransformedCenter());
sv.y -= 100;
sv.z -= 100;
sun.setPosition(sv);
MemoryHelper.compact();
if (master == null) {
Logger.log("Saving master Activity!");
master = HelloWorld.this;
}
}
}
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
}
public void onDrawFrame(GL10 gl) {
if (touchTurn != 0) {
cube.rotateY(touchTurn);
touchTurn = 0;
}
if (touchTurnUp != 0) {
cube.rotateX(touchTurnUp);
touchTurnUp = 0;
}
// Snip
// First
if (firstRun) {
fb.setVirtualDimensions(fb.getWidth(), fb.getHeight());
fb.sync();
fb.setRenderTarget(target);
int x = convertX(fb, target, 0);
int y = convertY(fb, target, target.getHeight() - 0);
int width = convertX(fb, target, target.getWidth());
int height = -convertY(fb, target, target.getHeight());
fb.blit(texture, 0, 0, x, y, 64, 64, width, height, -1, false, null);
fb.display();
fb.removeRenderTarget();
// second
fb.setRenderTarget(target2);
x = convertX(fb, target2, 0);
y = convertY(fb, target2, target2.getHeight() - 0);
width = convertX(fb, target2, target2.getWidth());
height = -convertY(fb, target2, target2.getHeight());
fb.blit(texture, 0, 0, x, y, 64, 64, width, height, -1, false, null);
fb.display();
fb.removeRenderTarget();
firstRun=false;
}
// Snap
fb.clear(back);
world.renderScene(fb);
world.draw(fb);
world.getCamera().moveCamera(Camera.CAMERA_MOVEOUT, 0.1f);
world.getCamera().rotateCameraZ(0.01f);
// And blit the result
fb.blit(target, 0, 0, 10, 10, 256, 256, 400, 400, -1, false, null);
fb.blit(target2, 0, 0, 10, 410, 256, 256, 400, 400, -1, false, null);
fb.display();
if (System.currentTimeMillis() - time >= 1000) {
Logger.log(fps + "fps");
fps = 0;
time = System.currentTimeMillis();
}
fps++;
}
public int convertX(FrameBuffer buffer, Texture target, int x) {
return (int) ((float) x * ((float) buffer.getWidth() / (float) target.getWidth()));
}
public int convertY(FrameBuffer buffer, Texture target, int y) {
return (int) ((float) y * ((float) buffer.getHeight() / (float) target.getHeight()));
}
public int getHeight(Texture target) {
return target.getHeight();
}
}
}
This whole issue is caused by a design flaw in the way in which jPCT as well as jPCT-AE calculates the actual blitting coordinates. It needs the current camera to do this, but neither FrameBuffer itself nor the blit-method have it, so it does some crude things internally to deal with it and when using a render target, this goes wrong if you don't offer it some support. I should really revise this somehow...sometime...
