im trying to make a cube with a different texture on each face.
I have the front face and the rear face working now. Now i am trying
to make the right face of the cube. But something is going wrong,
because i got the right face done but the texture is showing with
errors (it's like stretched and shredded), i have something bad in my
code and i dont know what.
This is my code
public class Cube {
private FloatBuffer vertexBuffer;//Vertices
private FloatBuffer textureBuffer;//Texture coordinates
private ByteBuffer indexBuffer;//Indices
private int[] textures = new int[6];//Texture pointer
private float vertices[] = { //8 vertices of the cube
-1.0f, -1.0f, 1.0f, // 0
1.0f, -1.0f, 1.0f, // 1
-1.0f, 1.0f, 1.0f, // 2
1.0f, 1.0f, 1.0f, // 3
-1.0f, -1.0f, -1.0f,// 4
1.0f, -1.0f, -1.0f, // 5
-1.0f, 1.0f, -1.0f, // 6
1.0f, 1.0f, -1.0f, // 7
};
private byte indices[] = { //Faces definition
0,1,2, 1,3,2, //front face (*)
6,7,5, 6,5,4, //rear face (**)
1,5,3, 5,7,3, //right face (***) //problems here
};
private float texture[] = {//Mapping coordinates for the vertices
0.0f, 1.0f,
1.0f, 1.0f,
0.0f, 0.0f,
1.0f, 0.0f,
0.0f, 1.0f,
1.0f, 1.0f,
0.0f, 0.0f,
1.0f, 0.0f,
0.0f, 1.0f,
1.0f, 1.0f,
0.0f, 0.0f,
1.0f, 0.0f,
};
public Cube()
{
ByteBuffer byteBuf = ByteBuffer.allocateDirect(vertices.length
* 4);
byteBuf.order(ByteOrder.nativeOrder());
vertexBuffer = byteBuf.asFloatBuffer();
vertexBuffer.put(vertices);
vertexBuffer.position(0);
byteBuf = ByteBuffer.allocateDirect(texture.length * 4);
byteBuf.order(ByteOrder.nativeOrder());
textureBuffer = byteBuf.asFloatBuffer();
textureBuffer.put(texture);
textureBuffer.position(0);
indexBuffer = ByteBuffer.allocateDirect(indices.length);
indexBuffer.put(indices);
indexBuffer.position(0);
}
public void draw(GL10 gl) {
//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_CCW);
//Enable the vertex and texture state
gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertexBuffer);
gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, textureBuffer);
//para que no pinte los poligonos que no se ven
//gl.glEnable(GL10.GL_CULL_FACE);
for(int i=0; i<3; i++) //<6 por que tenemos 6 texturas que
queremos
poner en las 6 caras de un cubo.
{
gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[i]);
indexBuffer.position(6*i); //como cada dos triangulos
(cuadrado)
forman una cara, estos dos triangulos son 6 indices del array de
indices, por lo tanto avanzamos 6 posiciones en el indexBuffer para
pintar el siguiente cuadrado.
gl.glDrawElements(GL10.GL_TRIANGLES, 6,
GL10.GL_UNSIGNED_BYTE,
indexBuffer); //el segundo parametro es 6 por que solo queremos pintar
una cara (cuadrado) por textura.
}
//gl.glDisable(GL10.GL_CULL_FACE); //para que no pinte los
poligonos
que no se ven
//Disable the client state before leaving
gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
}
public void loadGLTexture(GL10 gl, Context context) {
loadTexture(gl,context,R.drawable.s1,0);
loadTexture(gl,context,R.drawable.s2,1);
loadTexture(gl,context,R.drawable.s3,2);
loadTexture(gl,context,R.drawable.s4,3);
loadTexture(gl,context,R.drawable.s5,4);
loadTexture(gl,context,R.drawable.s6,5);
}
public void loadTexture(GL10 gl, Context context, int drawable, int
textureNumber)
{
//Get the texture from the Android resource directory
InputStream is =
context.getResources().openRawResource(drawable);
Bitmap bitmap = null;
try {
//BitmapFactory is an Android graphics utility for
images
bitmap = BitmapFactory.decodeStream(is);
} finally {
//Always clear and close
try {
is.close();
is = null;
} catch (IOException e) {
}
}
//Generate one texture pointer...
gl.glGenTextures(1, textures, textureNumber);
//...and bind it to our array
gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[textureNumber]);
//Create Nearest Filtered Texture
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);
//Different possible texture parameters, e.g.
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);
//Use the Android GLUtils to specify a two-dimensional texture
image
from our bitmap
GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0);
//Clean up
bitmap.recycle();
}
}
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