Почему в OpenGL ES android черный прямоугольник вместо текстуры?

Question

[Hakito]

Хочу в OpenGL ES отрисовать текстуру.
Текстура размером 256х256 png с альфа-каналом.
Извините, что в наглую кидаю код, просто два дня уже не могу с этим разобраться(

Шейдеры работают правильно, но в строчке:
texture2D(tex, texCoordOut);
всегда возвращается черный цвет. В общем, тут и проблема.

Шейдеры

<string name="vertexShader">

                    uniform mat4 MVPMatrix;
                    attribute vec4 vPos;
                    attribute vec2 texCoordIn;
                    varying vec2 texCoordOut;
                    void main()
                    {
                    gl_Position =  MVPMatrix * vPos ;
                    texCoordOut = texCoordIn;
                    }

    </string>

    <string name="fragmentShader">
                     precision mediump float;
                     uniform sampler2D tex;
                     varying vec2 texCoordOut;

                     void main()
                     {
                     gl_FragColor = texture2D(tex, texCoordOut);
                     }

    </string>

Код рендерера

package hakito.opengltest;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.opengl.GLES20;
import android.opengl.GLSurfaceView;
import android.opengl.GLUtils;
import android.opengl.Matrix;

import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;

import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;
import android.opengl.GLES20.*;


/**
 * Created by Oleg on 22-Jan-16.
 */
public class SimpleRenderer implements GLSurfaceView.Renderer {

    float[] verticesData =new float[]
            {
                    1, 1, 0, 1, 1,
                    1, -1, 0, 1, 0,
                    -1, -1, 0, 0, 0,
                    -1, 1, 0, 0, 1
            };

    byte[] indicesData = new byte[]{
            0, 2, 1,
            0, 3, 2
    };

    int[] textures = new int[1];

    private float[] mViewMatrix = new float[16];
    private float[] mProjectionMatrix = new float[16];
    private float[] mModelMatrix = new float[16];
    private float[] mMVPMatrix = new float[16];

    FloatBuffer vBuffer;
    ByteBuffer iBuffer;

    Bitmap ballBitmap;
    int bytesPerFloat=4;
    int positionHandle, MVPMatrixHandle;
    int coordsPerVertex=3, coordsPerTexture=2;
    int vSize=bytesPerFloat*coordsPerVertex, tSize=bytesPerFloat*coordsPerTexture;
    int vertexStride = vSize+tSize;

    String vShader, pShader;

    int vShaderHandle, pShaderHandle, programmHandle;

    public SimpleRenderer(Context context) {
        vShader=context.getString(R.string.vertexShader);

        pShader = context.getString(R.string.fragmentShader);


        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inScaled = false;

        ballBitmap = BitmapFactory.decodeResource(context.getResources(), R.drawable.ball, options);


    }

    @Override
    public void onSurfaceCreated(GL10 gl, EGLConfig config) {
        GLES20.glEnable(GLES20.GL_TEXTURE_2D);



        final float eyeX = 0.0f;
        final float eyeY = 0.0f;
        final float eyeZ = 1.5f;


        final float lookX = 0.0f;
        final float lookY = 0.0f;
        final float lookZ = 0f;


        final float upX = 0.0f;
        final float upY = 1.0f;
        final float upZ = 0.0f;


        Matrix.setLookAtM(mViewMatrix, 0, eyeX, eyeY, eyeZ, lookX, lookY, lookZ, upX, upY, upZ);



        vBuffer = ByteBuffer.allocateDirect(bytesPerFloat * verticesData.length).order(ByteOrder.nativeOrder()).asFloatBuffer().put(verticesData);
        vBuffer.position(0);


        iBuffer = ByteBuffer.allocateDirect(bytesPerFloat * indicesData.length).order(ByteOrder.nativeOrder()).put(indicesData);
        iBuffer.position(0);

        GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST);
        GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);

        GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_REPEAT);
        GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_REPEAT);

        GLES20.glGenTextures(1, textures, 0);
        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textures[0]);
        GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, GLUtils.getInternalFormat(ballBitmap), ballBitmap, 0);

        vShaderHandle = GLES20.glCreateShader(GLES20.GL_VERTEX_SHADER);
        GLES20.glShaderSource(vShaderHandle, vShader);
        GLES20.glCompileShader(vShaderHandle);

        pShaderHandle = GLES20.glCreateShader(GLES20.GL_FRAGMENT_SHADER);
        GLES20.glShaderSource(pShaderHandle, pShader);
        GLES20.glCompileShader(pShaderHandle);

        programmHandle = GLES20.glCreateProgram();
        GLES20.glAttachShader(programmHandle, vShaderHandle);
        GLES20.glAttachShader(programmHandle, pShaderHandle);
        GLES20.glLinkProgram(programmHandle);
        GLES20.glReleaseShaderCompiler();



    }

    @Override
    public void onSurfaceChanged(GL10 gl, int width, int height) {
        GLES20.glViewport(0, 0, width, width);
        GLES20.glClearColor(0.99f, 0.01f, 0, 1);
        final float ratio = (float) width / height;
        final float left = -ratio;
        final float right = ratio;
        final float bottom = -1.0f;
        final float top = 1.0f;
        final float near = 0.3f;
        final float far = 10.0f;

        Matrix.frustumM(mProjectionMatrix, 0, left, right, bottom, top, near, far);
    }



    @Override
    public void onDrawFrame(GL10 gl) {
        Matrix.setIdentityM(mModelMatrix, 0);
        Matrix.multiplyMM(mMVPMatrix, 0, mViewMatrix, 0, mModelMatrix, 0);


        Matrix.multiplyMM(mMVPMatrix, 0, mProjectionMatrix, 0, mMVPMatrix, 0);

        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);
        GLES20.glUseProgram(programmHandle);

        positionHandle = GLES20.glGetAttribLocation(programmHandle, "vPos");
        GLES20.glEnableVertexAttribArray(positionHandle);

        int textureCoordHandle = GLES20.glGetAttribLocation(programmHandle, "texCoordIn");
        GLES20.glEnableVertexAttribArray(textureCoordHandle);

        vBuffer.position(0);
        GLES20.glVertexAttribPointer(positionHandle, 3, GLES20.GL_FLOAT, false, vertexStride, vBuffer);

        vBuffer.position(3);
        GLES20.glVertexAttribPointer(textureCoordHandle, 2, GLES20.GL_FLOAT, false, vertexStride, vBuffer);


        GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textures[0]);

        int textureHandle = GLES20.glGetUniformLocation(programmHandle, "tex");
        GLES20.glUniform1i(textureHandle,0);


        MVPMatrixHandle = GLES20.glGetUniformLocation(programmHandle, "MVPMatrix");
        GLES20.glUniformMatrix4fv(MVPMatrixHandle, 1, false, mMVPMatrix, 0);

        GLES20.glDrawElements(GLES20.GL_TRIANGLES, indicesData.length, GLES20.GL_UNSIGNED_BYTE, iBuffer);

        GLES20.glDisableVertexAttribArray(positionHandle);
        GLES20.glDisableVertexAttribArray(textureCoordHandle);
    }
}