Change zNear and zFar parameters in GLU.gluPerspective(gl, 45.0f,
(float)width / (float)height, 0.1f, 100.0f) to 1 and 1000.
If it helps then your square is near far clipping plane.
пятница, 20 апреля 2012 г., 19:41:54 UTC+4 пользователь saex написал:
>
> Hi
>
> I'm displaying a OPENGL ES 1.X square with a texture, and the user can
> zoom in and out the square scaling it.
>
> When the user zoom's out the square (the square get's scaled going smaller
> in the screen) the texture of the square get's rare translucent squares,
> like tiles from googlemaps.
>
> I think that the scaling function from OpenGL is now working in the better
> way.
>
> How can i improve it?
>
> These are my OpenGL GLSurfaceView main functions:
>
> 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.
> for (int i=0;i<squares.size();i++){
> if (squares.get(i)!=null)
> squares.get(i).loadGLTexture(gl, context);
> }
> }
>
> public void onDrawFrame(GL10 gl) {
> //Limpiamos pantalla y Depth Buffer
> gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
> gl.glLoadIdentity();
>
> mg.getCurrentProjection(gl); //volvemos a generar las matrices por
> que es un bucle
> mg.getCurrentModelView(gl);
> .
> .
> .
> .
> gl.glTranslatef(X, Y, Z); //Move z units into the screen
> gl.glRotatef(zrot, 0.0f, 0.0f, 1.0f); //Z
> gl.glScalef(scale, scale, 1.0f);
>
> for (int i=0;i<squares.size();i++){
> if (squares.get(i)!=null)
> squares.get(i).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
>
> }
>
> and these are my square polygon class main functions:
>
> public void draw(GL10 gl) {
> gl.glFrontFace(GL10.GL_CCW);
> //Bind our only previously generated texture in this case
> gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[0]);
> //Point to our vertex buffer
> gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertexBuffer);
> gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, textureBuffer);
> //Enable vertex buffer
> gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
> gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
> //Draw the vertices as triangle strip
> gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, vertices.length / 3);
> //Disable the client state before leaving
> gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
> gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
> }
>
> //Carga de texturas
> public void loadGLTexture(GL10 gl, Context context) {
> //Generamos un puntero de texturas
> gl.glDeleteTextures(1, textures, 0); //libero memoria
> gl.glGenTextures(1, textures, 0);
> //y se lo asignamos a nuestro array
> gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[0]);
> //Creamos filtros de texturas
> 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);
> //Diferentes parametros de textura posibles GL10.GL_CLAMP_TO_EDGE
> gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_S,
> GL10.GL_REPEAT);
> gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T,
> GL10.GL_REPEAT);
>
> //Usamos Android GLUtils para espcificar una textura de 2 dimensiones
> para nuestro bitmap
> GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0);
>
> //Checkeamos si el GL context es versión 1.1 y generamos los Mipmaps por
> Flag. Si no, llamamos a nuestra propia implementación
> if(gl instanceof GL11) {
> gl.glTexParameterf(GL11.GL_TEXTURE_2D, GL11.GL_GENERATE_MIPMAP,
> GL11.GL_TRUE);
> GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0);
> } else {
> buildMipmap(gl, bitmap);
> }
> //Limpiamos los bitmaps
> bitmap.recycle();
> bitmap=null;
> System.gc();
> }
>
>
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