Develop Reference

Opengl-FrameBuffer Object Not Working on real device

I want to capture the rendered scene in my Android openGl App in A Texture Using FrameBuffer Object.
EveryThing is Fine in the emulator, But on Real Device the frameBuffer Object wouldn't work,
meaning Nothing Goes to my Texture, Here is the FBO Class (For Creating FrameBuffer and creating texture of it):
public class FBO {
int [] fb, renderTex;
int [] TextureBank;
int top;
int texW;
int texH;
int maxTextures;
public FBO(int width,int height,int maxTextures){
texW = width;
texH = height;
fb = new int[1];
renderTex= new int[1];
top=-1;
this.maxTextures = maxTextures;
TextureBank = new int[maxTextures];
}
public void setup(GL10 gl){
// generate
((GL11ExtensionPack)gl).glGenFramebuffersOES(1, fb, 0);
gl.glEnable(GL10.GL_TEXTURE_2D);
gl.glGenTextures(1, renderTex, 0);// generate texture
gl.glBindTexture(GL10.GL_TEXTURE_2D, renderTex[0]);
gl.glTexParameterf(GL10.GL_TEXTURE_2D,
GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_NEAREST);
gl.glTexParameterf(GL10.GL_TEXTURE_2D,
GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_NEAREST);
gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_S,
GL10.GL_CLAMP_TO_EDGE);
gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T,
GL10.GL_CLAMP_TO_EDGE);
//texBuffer = ByteBuffer.allocateDirect(buf.length*4).order(ByteOrder.nativeOrder()).asIntBuffer();
//gl.glTexEnvf(GL10.GL_TEXTURE_ENV, GL10.GL_TEXTURE_ENV_MODE,GL10.GL_MODULATE);
gl.glTexImage2D(GL10.GL_TEXTURE_2D, 0, GL10.GL_RGBA, texW, texH, 0, GL10.GL_RGBA, GL10.GL_FLOAT, null);
gl.glDisable(GL10.GL_TEXTURE_2D);
if(top>=maxTextures-1){
Log.e("OUT OF TEXTURE COUNTS", "OUT OF TEXTURE COUNTS Texture WIll Not Be added to Stack");
}
else{
TextureBank [++top]= renderTex[0];
Log.d("TOP= ", "" + top);
}
}
public boolean RenderStart(GL10 gl){
// Bind the framebuffer
((GL11ExtensionPack)gl).glBindFramebufferOES(GL11ExtensionPack.GL_FRAMEBUFFER_OES, fb[0]);
// specify texture as color attachment
((GL11ExtensionPack)gl).glFramebufferTexture2DOES(GL11ExtensionPack.GL_FRAMEBUFFER_OES, GL11ExtensionPack.GL_COLOR_ATTACHMENT0_OES, GL10.GL_TEXTURE_2D, renderTex[0], 0);
int error = gl.glGetError();
if (error != GL10.GL_NO_ERROR) {
Log.d("err", "FIRST Background Load GLError: " + error+" ");
}
int status = ((GL11ExtensionPack)gl).glCheckFramebufferStatusOES(GL11ExtensionPack.GL_FRAMEBUFFER_OES);
if (status != GL11ExtensionPack.GL_FRAMEBUFFER_COMPLETE_OES)
{
Log.d("err", "SECOND Background Load GLError: " + status+" ");;
return true;
}
gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
return true;
}
public void RenderEnd(GL10 gl){
((GL11ExtensionPack)gl).glBindFramebufferOES(GL11ExtensionPack.GL_FRAMEBUFFER_OES, 0);
gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
gl.glEnable(GL10.GL_TEXTURE_2D);
gl.glBindTexture(GL10.GL_TEXTURE_2D, 0);
gl.glColor4f(1,1,1,1);
gl.glDisable(GL10.GL_TEXTURE_2D);
}
public int getTexture(){
return renderTex[0];
}
}
And here is my OnDrawFrame Method Which uses this FBO:
public synchronized void onDrawFrame(GL10 gl) {
mObserver.onDrawFrame();
gl.glClearColor(Color.red(mBackgroundColor) / 255f,
Color.green(mBackgroundColor) / 255f,
Color.blue(mBackgroundColor) / 255f,
Color.alpha(mBackgroundColor) / 255f);
gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
gl.glLoadIdentity();
if(capture){
if(AttachTexture){
int h = gl.glGetError();
/**
Setup FBO
*/
frameBuffer.setup(gl);
if(h!=0){
Log.d("ERROR", "ERROR Happend"+h+"");
}
AttachTexture = false;
}
/**
Start Rendering In FBO
*/
frameBuffer.RenderStart(gl);
if (USE_PERSPECTIVE_PROJECTION) {
double x = mCurlMesh.GetMinX()* mCurlMesh.GetMinY();
gl.glTranslatef((float)(-1.000-mCurlMesh.GetMinX()),(float)(-1.000-mCurlMesh.GetMinY()), -6f);
}
gl.glMatrixMode(GL10.GL_PROJECTION);
gl.glLoadIdentity();
GLU.gluOrtho2D(gl, (float)mCurlMesh.GetMinX(), (float)mCurlMesh.GetMaxX(),
(float)mCurlMesh.GetMinY(), (float)mCurlMesh.GetMaxY());
gl.glMatrixMode(GL10.GL_MODELVIEW);
gl.glLoadIdentity();
gl.glViewport(0, 0,texW,texH);
mCurlMesh.onDrawFrame(gl);
/**
End Rendering In FBO
*/
frameBuffer.RenderEnd(gl);
}
//Reset Every Thing to Its Normal State
gl.glMatrixMode(GL10.GL_PROJECTION);
gl.glLoadIdentity();
GLU.gluOrtho2D(gl, -1.1f,1.1f,-1.1f, 1.1f);
gl.glMatrixMode(GL10.GL_MODELVIEW);
gl.glLoadIdentity();
gl.glViewport(0, 0, mViewportWidth, mViewportHeight);
mCurlMesh.onDrawFrame(gl);
}
I Should mention that my Texture size IS 2^n:
frameBuffer = new FBO(1024, 1024, 8);

OpenGL ES 1.0 GL_TRIANGLES working on Android 2.3 but not on 3.x/4.x

So I'm making an app for Android with OpenGL ES 1.0. My problem is that objects which are drawn using GL_TRIANGLES do not show on Android 3.x nor 4.x but everything works perfectly on 2.x. Is there anything to be enabled or disabled before?
File with GL_TRIANGLES (Model.java):
public class Model() {
private FloatBuffer vertexBuffer;
private ByteBuffer indexBuffer;
private FloatBuffer colorBuffer;
byte indices[] = {0, 1, 2};
float vertices[];
float colors[] = {1.0f, 1.0f, 1.0f, 1.0f};
public load(int resid, Context context) {
ModelLoader.load(context, resid);
vertices = ModelLoader.vertices();
colors = ModelLoader.colors();
ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length * 4);
vbb.order(ByteOrder.nativeOrder());
vertexBuffer = vbb.asFloatBuffer();
vertexBuffer.put(vertices);
vertexBuffer.position(0);
ByteBuffer cbb = ByteBuffer.allocateDirect(colors.length * 4);
cbb.order(ByteOrder.nativeOrder());
colorBuffer = cbb.asFloatBuffer();
colorBuffer.put(colors);
colorBuffer.position(0);
indexBuffer = ByteBuffer.allocateDirect(indices.length);
indexBuffer.put(indices);
indexBuffer.position(0);
}
public void draw(GL10 gl) {
gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertexBuffer);
gl.glEnableClientState(GL10.GL_COLOR_ARRAY);
gl.glDrawArrays(GL10.GL_TRIANGLES, 0, vertices.length / 3);
gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
gl.glDisableClientState(GL10.GL_COLOR_ARRAY);
}
}
File with render(GLRender.java):
public class GLRender extends GLSurfaceView.Renderer {
public Model sample = new Model();
public void onSurfaceChanged(GL10 gl, int w, int h) {
if(h==0) h=1;
float aspect = (float)w/h;
gl.glViewport(0, 0, w, h);
gl.glMatrixMode(GL10.GL_PROJECTION);
gl.glLoadIdentity();
GLU.gluPerspective(gl, 45, aspect, 0.1f, 100.0f);
gl.glMatrixMode(GL10.GL_MODELVIEW);
gl.glLoadIdentity();
}
public void onSurfaceCreated(GL10 gl, EGLConfig glc) {
gl.glClearColor(0, 0, 0, 1.0f);
gl.glClearDepthf(1.0f);
gl.glEnable(GL10.GL_DEPTH_TEST);
gl.glDisable(GL10.GL_CULL_FACE);
gl.glDepthFunc(GL10.GL_LEQUAL);
gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_NICEST);
gl.glShadeModel(GL10.GL_SMOOTH);
gl.glDisable(GL10.GL_DITHER);
gl.glEnable(GL10.GL_LIGHTING);
gl.glEnable(GL10.GL_LIGHT0);
gl.glEnable(GL10.GL_COLOR_MATERIAL);
gl.glEnable(GL10.GL_TEXTURE_2D);
gl.glEnable(GL10.GL_BLEND);}
public void onDrawFrame(GL10 gl) {
gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
gl.glLoadIdentity(); // Reset model-view matrix ( NEW )
gl.glMatrixMode(GL10.GL_MODELVIEW);
gl.glPushMatrix();
sample.draw(gl);
gl.glPopMatrix();
}
}
I think it's enough.
The above code is not a problem. It works (at least on Honeycomb).

I found a solution, the problem was in the model loader because for some reason File or FileInputStream is not null by default in 3.x+ (I optimized the class to use with other java projects).

Android OpenGL ES, weird quality using 2D texture

after a long search, I didn't find any solution to my problem, so here it is:
I have the following sprite:
http://i46.tinypic.com/rmji2d.png"">
but in my game with a OpenGLSurface, using 2d texture it looks like this:
http://i47.tinypic.com/2wqb9qs.png"">
The options I'm using in my textures are these:
public void onSurfaceCreated(GL10 gl, EGLConfig confid) {
gl.glEnable(GL10.GL_TEXTURE_2D);
gl.glShadeModel(GL10.GL_SMOOTH);
gl.glClearColor(255,255, 255,0);
gl.glClearDepthf(1.0f);
gl.glEnable(GL10.GL_BLEND);
gl.glDisable(GL10.GL_DEPTH_TEST);
gl.glBlendFunc(GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA);
}
public void loadTextures(GL10 gl, Context context) {
gl.glGenTextures(textureCount, textures, 0);
for (int loop = 0; loop < textureCount; loop++) {
gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[loop]);
gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER,
GL10.GL_LINEAR);
gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER,
GL10.GL_LINEAR);
gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, // OpenGL docs.
GL10.GL_NICEST);
GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap[loop], 0);
bitmap[loop].recycle();
}
}
Is it only this weird because i'm scaling the image, making it shortier?
Is there anything i can do to have better graphics?
ADDED the DRAW:
public void draw(GL10 gl) {
gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[0]);
for (int loop = 0; loop < sprites.size(); loop++) {
gl.glPushMatrix();
try {
DevQuestSprite sprite = sprites.get(loop);
sprite.update(screenHeight); // update enemy
gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[sprite.curSprite]);
float transx = (wRatio * sprite.x);
float transy = (screenHeight * wRatio) - (wRatio * sprite.y)
- 1 / hRatio;
gl.glTranslatef(transx, transy, 0.0f);
sprite.draw(gl);
} catch (NullPointerException e) {
}
gl.glPopMatrix();
}
}

rotate texture around its center in opengl

I am trying to rotate the texture around its center but it is not giving the expected results can you please see the code and let me know what i am missing?
here is my code
public class GLRenderer implements Renderer {
Context context;
Square s;
float x = 100 ,y = 100 ;
float w,h;
public GLRenderer(Context c) {
context = c;
s = new Square(x,y);
}
#Override
public void onDrawFrame(GL10 gl) {
s.draw(gl);
}
#Override
public void onSurfaceChanged(GL10 gl, int width, int height) {
gl.glViewport(0, 0, width, height);
gl.glOrthof(0, 320, 0, 480, 0, 1);
gl.glMatrixMode(GL10.GL_PROJECTION);
gl.glLoadIdentity();
gl.glEnable(GL10.GL_TEXTURE_2D);
}
#Override
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
s.loadGLTexture(gl, R.drawable.ic_launcher);
}
public class Square{
int textures[] = new int[1];
FloatBuffer vertexbuffer;
FloatBuffer texturebuffer;
float texture[] ={
1.0f, 1.0f,
1.0f, 0.0f,
0.0f, 1.0f,
0.0f, 0.0f
};
public Square(float x, float y){
float vertices[] = {
x,y,0,
x,y+100,0,
x+100,y,0,
x+100,y+100,0
};
ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length*4);
vbb.order(ByteOrder.nativeOrder());
vertexbuffer = vbb.asFloatBuffer();
vertexbuffer.put(vertices);
vertexbuffer.position(0);
ByteBuffer tbb = ByteBuffer.allocateDirect(texture.length*4);
tbb.order(ByteOrder.nativeOrder());
texturebuffer = tbb.asFloatBuffer();
texturebuffer.put(texture);
texturebuffer.position(0);
}
public void draw(GL10 gl) {
gl.glPushMatrix();
gl.glTranslatef(-150, -150, 0);
gl.glRotatef(30,0, 0,1 );
gl.glTranslatef(150, 150, 0);
// Point to our buffers
gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
// Set the face rotation
gl.glFrontFace(GL10.GL_CW);
// Point to our vertex buffer
gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertexbuffer);
gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, texturebuffer);
// Draw the vertices as triangle strip
gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, 4);
//Disable the client state before leaving
gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
r = r+10;
gl.glPopMatrix();
}
public void loadGLTexture(GL10 gl, int drawable) {
Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(),
drawable);
gl.glGenTextures(1, textures, 0);
gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[0]);
gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_NEAREST);
gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR);
GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0);
bitmap.recycle();
}
}
}

Since your plane is facing the Z axis, you actually need to rotate it on the Z axis, and not on the X.
So gl.glRotatef(30, 1, 0, 0) would be gl.glRotatef(30, 0, 0, 1)
Oh, and the translation values are actually -150 and 150, not -50 & 50. Since your plane is 100x100 and it "begins" in (100,100) so 150 would be the center of the plane.
But you should try not using that x and y variables. Then your vertices would become { 0,0,0, 0,100,0, 100,0,0, 100,100,0 }, it's in this case that you'd translate it by (-50, -50, 0) and then (50, 50, 0).

Android OpenGL ES not drawing Texture

I have a very basic Activity at the moment. It creates a GLSurfaceView and sets the Renderer. The problem is all I see is red, which is from glClearColor, and no texture. Not even a white area. Also glGetError() is not reporting anything.
Here is the Renderer:
public class MyRenderer implements Renderer {
public MyRenderer(Context context)
{
mContext = context;
}
public void onDrawFrame(GL10 gl) {
gl.glClearColor(1.0f, 0.0f, 0.0f, 1.0f);
gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
gl.glBindTexture(GL10.GL_TEXTURE_2D, texture[0]);
gl.glVertexPointer(2, GL10.GL_FLOAT, 0, vertex);
gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, texCoords);
gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, 4);
gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
}
public void onSurfaceChanged(GL10 gl, int width, int height) {
gl.glViewport(0, 0, width, height);
gl.glMatrixMode(GL10.GL_PROJECTION);
gl.glLoadIdentity();
gl.glOrthof(-160.0f, 160.0f, -240.0f, 240.0f, 0.1f, 1.0f);
gl.glMatrixMode(GL10.GL_MODELVIEW);
gl.glLoadIdentity();
}
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
float vertexBuffer[] = {
-160.0f, -240.0f,
-160.0f, 240.0f,
160.0f, -240.0f,
160.0f, 240.0f
};
vertex = ByteBuffer.allocateDirect(8 * 4).asFloatBuffer().put(vertexBuffer);
float texCoordsBuffer[] = {
0.0f, 0.0f,
0.0f, 480.0f/512.0f,
320.0f/512.0f, 0.0f,
320.0f/512.0f, 480.0f/512.0f
};
texCoords = ByteBuffer.allocateDirect(8 * 4).asFloatBuffer().put(texCoordsBuffer);
BitmapFactory.Options options = new BitmapFactory.Options();
options.inDensity = 240; // needed so that the image will be 512x512
Bitmap bitmap = BitmapFactory.decodeResource(mContext.getResources(), R.drawable.image, options);
int width = bitmap.getWidth();
int height = bitmap.getHeight();
Log.i(TAG, "Bitmap:{w:" + width + " h:" + height + "}");
gl.glEnable(GL10.GL_TEXTURE_2D);
texture = new int[1];
gl.glGenTextures(1, texture, 0);
gl.glBindTexture(GL10.GL_TEXTURE_2D, texture[0]);
gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR);
gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR);
GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0);
bitmap.recycle();
int error = gl.glGetError();
if (error != GL10.GL_NO_ERROR)
{
Log.e(TAG, "GL Texture Load Error: " + error);
}
}
private Context mContext;
private int texture[];
private FloatBuffer vertex;
private FloatBuffer texCoords;
}

There are several problems with your code:
You need to set the byte order of your buffers to native:
vertex.order(ByteOrder.nativeOrder())
After copying data into your buffers, reset the position to 0:
vertex.position(0)
(Do both for texCoord as well).
It would probably also help to put your near clipping plane at -1.0 instead of .1 (in glOrthof).

// needed because the image won't be 512x512
To have OpenGL render the texture, the texture size needs to be a power of 2, ie 64x64, 128x32 or 256x1024