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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