I'm trying to create a simple opengl test.
i have a GLSurfaceView class that must show a square with a texture.
I'm trying to fit the screen with the texture/polygon dimensions, then
i need to use projections.
I'm using 3 classes to have compatibility with android 1.5:
MatrixGrabber.java MatrixStack.java MatrixTrackingGL.java
The problem is that i am getting an exception because all the content
of my GL10 gl object is null, then, when i try to get the projection
or the model matrix i got exception.
THis is the code:
public class SquareGLSurfaceView extends GLSurfaceView implements
Renderer {
private Square square;
private final float Z = -1.0f; //eje Z
private float x = 0; //eje X
private float y = 0; //eje Y
private float oldX;
private float oldY;
private final float TOUCH_SCALE = 0.2f; //Proved to be good
for normal rotation ( NEW )
private static Context context;
//los siguientes valores son para hacer proyecciones gluProject
para mover el objeto con el dedo
float screen2GL = 0f;
float [] modelMatrix = new float[16];
float [] projMatrix = new float[16];
float [] outputCoords= new float[4];
int [] mView = new int[4];
private float scale=0.01f;
// Translations
float offset_x , offset_y;
private MatrixGrabber mg = new MatrixGrabber(); //create the
matrix grabber object in your initialization code
int screenW; //screen Width
int screenH; //screen Height
public SquareGLSurfaceView(Context context) {
super(context);
this.setRenderer(this);
this.requestFocus();
this.setFocusableInTouchMode(true);
this.context = context;
Bitmap bm=loadImage("sample_0");
square = new Square(bm);
DisplayMetrics dm = new DisplayMetrics();
((Activity)context).getWindowManager().getDefaultDisplay().getMetrics(dm);
screenW=dm.widthPixels;
screenH=dm.heightPixels;
modelMatrix=mg.mModelView;
projMatrix=mg.mProjection;
mView[0] = 0;
mView[1] = 0;
mView[2] = screenW; //width
mView[3] = screenH; //height
}
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
gl.glDisable(GL10.GL_DITHER); //dithering OFF
gl.glEnable(GL10.GL_TEXTURE_2D); //Texture Mapping
ON
gl.glShadeModel(GL10.GL_SMOOTH); //Smooth Shading
gl.glClearDepthf(1.0f); //Depth Buffer
Setup
gl.glEnable(GL10.GL_DEPTH_TEST); //Depth Testing ON
gl.glDepthFunc(GL10.GL_LEQUAL);
gl.glClearColor(0,0,0,0); //fondo
transparente
gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT,
GL10.GL_NICEST);
//Cargamos la textura del cubo.
square.loadGLTexture(gl, this.context);
}
public void onDrawFrame(GL10 gl) {
//Clear Screen And Depth Buffer
gl.glClear(GL10.GL_COLOR_BUFFER_BIT |
GL10.GL_DEPTH_BUFFER_BIT);
gl.glLoadIdentity(); //Reset The Current
Modelview Matrix
mg.getCurrentProjection(gl);
mg.getCurrentModelView(gl);
// Translating
if( offset_x != 0 ){
x+=offset_x * screen2GL;
offset_x = 0;
}
if( offset_y != 0 ){
y+=offset_y * screen2GL;
offset_y = 0;
}
gl.glTranslatef(x, y, Z ); //Move z units into the
screen
Log.d("onDrawFrame","x:"+x+" y:"+y+" z:"+Z);
//Drawing
gl.glScalef(scale, scale, 1.0f);
square.draw(gl); //Draw the Cube
}
public void onSurfaceChanged(GL10 gl, int width, int height) {
if(height == 0) { //Prevent A Divide By
Zero By
height = 1; //Making Height Equal
One
}
gl.glViewport(0, 0, width, height); //Reset The Current
Viewport
gl.glMatrixMode(GL10.GL_PROJECTION); //Select The
Projection Matrix
gl.glLoadIdentity(); //Reset The Projection
Matrix
//Calculate The Aspect Ratio Of The Window
GLU.gluPerspective(gl, 45.0f, (float)width / (float)height,
0.1f, 100.0f);
gl.glMatrixMode(GL10.GL_MODELVIEW); //Select The Modelview
Matrix
gl.glLoadIdentity(); //Reset The Modelview
Matrix
solveScreen2GL();
}
public boolean onTouchEvent(MotionEvent event) {
float screenX = event.getX();
float screenY = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
break;
case MotionEvent.ACTION_UP:
break;
case MotionEvent.ACTION_MOVE:
offset_x+=screenX - oldX;
offset_y-=screenY - oldY;
break;
}
oldX=event.getX();
oldY=event.getY();
return true; //El evento ha sido manejado
}
}
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