How to draw bitmap over EglSurface in Google Grafika ContinuousCaptureActivity?

How to draw bitmap over EglSurface in Google Grafika ContinuousCaptureActivity? - android

I'm trying to draw some kind of watermark on the video with GLUtils.texImage2D function, but it does not appear on preview and recorded video. What I'm doing wrong?
private void drawFrame() {
mDisplaySurface.makeCurrent();
mCameraTexture.updateTexImage();
mCameraTexture.getTransformMatrix(mTmpMatrix);
AutoFitTextureView sv = (AutoFitTextureView) findViewById(R.id.texture);
int viewWidth = sv.getWidth();
int viewHeight = sv.getHeight();
GLES20.glViewport(0, 0, viewWidth, viewHeight);
mFullFrameBlit.drawFrame(mTextureId, mTmpMatrix);
drawExtra(mFrameNum, viewWidth, viewHeight);
loadWatermark(BitmapFactory.decodeResource(getResources(), R.drawable.ic_settings_white_24dp));
mDisplaySurface.swapBuffers();
if (!mFileSaveInProgress) {
mEncoderSurface.makeCurrent();
GLES20.glViewport(0, 0, videoHeightSetting,
videoWidthSetting);
mFullFrameBlit.drawFrame(mTextureId, mTmpMatrix);
drawExtra(mFrameNum,
videoWidthSetting,
videoHeightSetting);
loadWatermark(BitmapFactory.decodeResource(getResources(), R.drawable.ic_settings_white_24dp));
mCircEncoder.frameAvailableSoon();
mEncoderSurface.setPresentationTime(mCameraTexture.getTimestamp());
mEncoderSurface.swapBuffers();
}
mFrameNum++;
}
private void loadWatermark(Bitmap bitmap) {
final int[] textureHandle = new int[1];
GLES20.glGenTextures(1, textureHandle, 0);
GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureHandle[0]);
GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0);
bitmap.recycle();
}

Related

android opengl bitmap image not rendered with texImage2D

I want to create a waving flag as live wallpaper, the problem is it does not draw image(with no error!) but it draws other textures successfully.
I considered other similar questions and solutions of them but no success.
here is the code for StripesSurfaceView that implements GLSurfaceView.Renderer :
private final class StripesSurfaceView extends GLSurfaceView implements
GLSurfaceView.Renderer {
private Context context;
private int textures[];
private OpenGLFlag flag;
private boolean paused = false;
public StripesSurfaceView(Context context) {
super(context);
this.context = context;
setRenderer(this);
setRenderMode(GLSurfaceView.RENDERMODE_CONTINUOUSLY);
}
#Override
public final SurfaceHolder getHolder() {
return WallpaperEngine.this.getSurfaceHolder();
}
public final void onDestroy() {
super.onDetachedFromWindow();
}
#Override
public final void onDrawFrame(GL10 gl) {
GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);
gl.glPushMatrix();
// rotate
gl.glRotatef(Constants.FLAG_ROTATION_X, 1.0f, 0.0f, 0.0f);
gl.glRotatef(Constants.FLAG_ROTATION_Y, 0.0f, 1.0f, 0.0f);
gl.glRotatef(Constants.FLAG_ROTATION_Z, 0.0f, 0.0f, 1.0f);
// draw
flag.draw(gl, paused);
gl.glPopMatrix();
}
#Override
public final void onSurfaceChanged(GL10 gl, int width,
int height) {
float ratio = (float) width / height;
// flag
flag = new OpenGLFlag(textures[0], 0, 0, 0, ratio * 2, ratio);
gl.glShadeModel(GL10.GL_SMOOTH);
GLES20.glClearDepthf(1.0f);
GLES20.glEnable(GLES20.GL_DEPTH_TEST);
GLES20.glDepthFunc(GLES20.GL_LEQUAL);
GLES20.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GLES20.GL_NICEST);
GLES20.glEnable(GLES20.GL_BLEND);
GLES20.glEnable(GL10.GL_POINT_SMOOTH);
GLES20.glBlendFunc(GLES20.GL_ONE, GLES20.GL_ONE_MINUS_SRC_ALPHA); // https://www.opengl.org/sdk/docs/man2/xhtml/glBlendFunc.xml
GLES20.glViewport(0, 0, width, height);
gl.glMatrixMode(GL10.GL_PROJECTION);
gl.glLoadIdentity();
gl.glFrustumf(-ratio, ratio, -1, 1, 3, 7); // https://www.opengl.org/sdk/docs/man2/xhtml/glFrustum.xml
gl.glMatrixMode(GL10.GL_MODELVIEW);
gl.glLoadIdentity();
GLU.gluLookAt(gl, 0, 0, 3.5f, 0, 0, 0, 0, 1.0f, 0); // https://www.opengl.org/sdk/docs/man2/xhtml/gluLookAt.xml
}
#Override
public final void onSurfaceCreated(GL10 gl, EGLConfig config)
{
// bind texture
textures = new int[1];
GLES20.glEnable(GLES20.GL_TEXTURE_2D);
GLES20.glGenTextures(textures.length, textures, 0);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textures[0]);
Log.d("gfd", context.getResources()+" :: "+ Constants.FLAG_TEXTURE);
Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), R.drawable.s);
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_NEAREST);
GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0);
bitmap.recycle();
}
}
}
and here is where StripesSurfaceView called:
private final class WallpaperEngine extends Engine {
private StripesSurfaceView mGLSurfaceView;
#Override
public void onCreate(SurfaceHolder surfaceHolder) {
super.onCreate(surfaceHolder);
mGLSurfaceView = new StripesSurfaceView(getApplicationContext());
}
// ..... etc
here is the current result:
texture to wave:

problem solved using decodestream :
private Bitmap getBitmapFromAssets(Context context, String fileName, int width, int height) {
AssetManager asset = context.getAssets();
InputStream is;
try {
is = asset.open(fileName);
BitmapFactory.Options options = new BitmapFactory.Options();
Bitmap bit=BitmapFactory.decodeStream(is, null, options);
return bit;
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
I released source here:
https://github.com/ataafarin/android-live-wallpaper-wavingflag

How to get "rendered" image with glReadPixels from FrameBuffer after calling glDrawElements

I modified brightness, contrast, and saturation of some image by fragment shader of OpenGL ES 2.0. And... to save modified image, I used this method.
public static Bitmap saveTexture(int texture, int width, int height) {
int[] frame = new int[1];
GLES20.glGenFramebuffers(1, frame, 0);
GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, frame[0]);
GLES20.glFramebufferTexture2D(GLES20.GL_FRAMEBUFFER, GLES20.GL_COLOR_ATTACHMENT0, GLES20.GL_TEXTURE_2D, texture, 0);
ByteBuffer buffer = ByteBuffer.allocate(width * height * 4);
GLES20.glReadPixels(0, 0, width, height, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, buffer);
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.copyPixelsFromBuffer(buffer);
GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, 0);
GLES20.glDeleteFramebuffers(1, frame, 0);
return bitmap;
}
But, this method return the original image, not modified. What is wrong?
Please advise me how to resolve this. :/
I added more information.
This code is my GLSurfaceView.Renderer's code.
#Override
public void onSurfaceCreated(GL10 gl10, EGLConfig eglConfig) {
mTextureID = OpenGLTools.loadImageTexture(mBitmap, true);
GLES20.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
mProgram = OpenGLTools.loadProgram(VERTEX_SHADER, FRAGMENT_SHADER);
}
#Override
public void onSurfaceChanged(GL10 gl10, int width, int height) {
GLES20.glViewport(0, 0, width, height);
}
#Override
public void onDrawFrame(GL10 gl10) {
GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
draw();
}
public void draw() {
if (!GLES20.glIsProgram(mProgram)) OpenGLTools.loadProgram(VERTEX_SHADER, FRAGMENT_SHADER);
GLES20.glUseProgram(mProgram);
int positionHandle = GLES20.glGetAttribLocation(mProgram, "position");
GLES20.glVertexAttribPointer(positionHandle, 3, GLES20.GL_FLOAT, false, 0, mVertexBuffer);
GLES20.glEnableVertexAttribArray(positionHandle);
int textureCoordinateHandle = GLES20.glGetAttribLocation(mProgram, "inputTextureCoordinate");
GLES20.glVertexAttribPointer(textureCoordinateHandle, 2, GLES20.GL_FLOAT, false, 0, mTexCoordBuffer);
GLES20.glEnableVertexAttribArray(textureCoordinateHandle);
int brightness = GLES20.glGetUniformLocation(mProgram, "brightness");
GLES20.glUniform1f(brightness, mEditParams.mBrightness / 200.0f);
int contrast = GLES20.glGetUniformLocation(mProgram, "contrast");
GLES20.glUniform1f(contrast, mEditParams.mContrast / 200.0f);
int saturation = GLES20.glGetUniformLocation(mProgram, "saturation");
GLES20.glUniform1f(saturation, (mEditParams.mSaturation + 100) / 100.0f);
GLES20.glDrawElements(GLES20.GL_TRIANGLES, 6, GLES20.GL_UNSIGNED_SHORT, mDrawListBuffer);
GLES20.glDisableVertexAttribArray(positionHandle);
GLES20.glDisableVertexAttribArray(textureCoordinateHandle);
}
public Bitmap getBitmap() {
return OpenGLTools.saveTexture(mTextureID, mBitmap.getWidth(), mBitmap.getHeight());
}
And... this is the code in OpenGLTools class.
public static int loadImageTexture(final Bitmap bitmap, final boolean recycle) {
int[] textureNames = new int[1];
GLES20.glGenTextures(1, textureNames, 0);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureNames[0]);
GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
if (recycle) {
bitmap.recycle();
}
return textureNames[0];
}
public static int loadProgram(final String vsc, final String fsc) {
int[] success = new int[1];
int vshader = GLES20.glCreateShader(GLES20.GL_VERTEX_SHADER);
GLES20.glShaderSource(vshader, vsc);
GLES20.glCompileShader(vshader);
GLES20.glGetShaderiv(vshader, GLES20.GL_COMPILE_STATUS, success, 0);
if (success[0] == 0) {
Log.e("CheckLog", "Could not compile vertex shader : " + GLES20.glGetShaderInfoLog(vshader));
GLES20.glDeleteShader(vshader);
return 0;
}
int fshader = GLES20.glCreateShader(GLES20.GL_FRAGMENT_SHADER);
GLES20.glShaderSource(fshader, fsc);
GLES20.glCompileShader(fshader);
GLES20.glGetShaderiv(fshader, GLES20.GL_COMPILE_STATUS, success, 0);
if (success[0] == 0) {
Log.e("CheckLog", "Could not compile fragment shader : " + GLES20.glGetShaderInfoLog(fshader));
GLES20.glDeleteShader(fshader);
return 0;
}
int program = GLES20.glCreateProgram();
GLES20.glAttachShader(program, vshader);
GLES20.glAttachShader(program, fshader);
GLES20.glLinkProgram(program);
GLES20.glGetProgramiv(program, GLES20.GL_LINK_STATUS, success, 0);
if (success[0] <= 0) {
Log.e("CheckLog", "Could not link OpenGLES program :" + GLES20.glGetProgramInfoLog(program));
GLES20.glDeleteProgram(program);
return 0;
} else {
Log.i("CheckLog", "Linked OpenGLES program");
}
return program;
}
public static Bitmap saveTexture(int texture, int width, int height) {
int[] frame = new int[1];
GLES20.glGenFramebuffers(1, frame, 0);
GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, frame[0]);
GLES20.glFramebufferTexture2D(GLES20.GL_FRAMEBUFFER, GLES20.GL_COLOR_ATTACHMENT0, GLES20.GL_TEXTURE_2D, texture, 0);
ByteBuffer buffer = ByteBuffer.allocate(width * height * 4);
GLES20.glReadPixels(0, 0, width, height, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, buffer);
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.copyPixelsFromBuffer(buffer);
GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, 0);
GLES20.glDeleteFramebuffers(1, frame, 0);
return bitmap;
}
If I touch save button, getBitmap method is called in the OpenGLES context. I can change the Bitmap's parameters(brightness, contrast and saturation) and it shows up on display in real time. However, changed parameters are not applied the saved image when I touch the save button. I want to save the image with changed parameters.

You're passing the original texture handle as the texture parameter input into saveTexture(), so it's no surprise that that is the data you are saving back to disk.
You don't actually want to save a texture - you want to save the contents of the active framebuffer - so that function isn't what your code needs. Try this one:
public static Bitmap saveTexture(int width, int height) {
ByteBuffer buffer = ByteBuffer.allocate(width * height * 4);
GLES20.glReadPixels(0, 0, width, height, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, buffer);
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.copyPixelsFromBuffer(buffer);
return bitmap;
}

Android YUV-RGB conversion in OpenGL ES 2.0 fragment shader [duplicate]

I've a problem with convertion of camera preview in Android from YUV format to RGB. The purpose of conversion is to apply some effects. I try to convert by fragment shader because convertion by native code is slow (about 14fps). The reference which I've used is http://jyrom.tistory.com/m/post/view/id/187. I try to port this code to Android platform, but the result is black-green rectangles. But, I can watch some form through the output which I get. Could you please try to help me to resolve this issue. I believe this is popular problem: apply effects to camera preview. I also give a link to my project for testing: https://dl.dropbox.com/u/12829395/application/FilterGL/FilterGL.zip.
Thank you.
UPDATED:
This is my onPreviewFrame method:
public void onPreviewFrame(byte[] data, Camera camera) {
yBuffer.put(data);
yBuffer.position(0);
System.arraycopy(data, U_INDEX, uData, 0, LENGTH_4 * 2);
uBuffer.put(uData);
uBuffer.position(0);
System.arraycopy(data, V_INDEX, vData, 0, LENGTH_4);
vBuffer.put(vData);
vBuffer.position(0);
}
This is how I bind byte arrays to OpenGL texture in onDrawFrame method:
GLES20.glUniform1i(yTexture, 1);
GLES20.glTexImage2D( GLES20.GL_TEXTURE_2D, 0, GLES20.GL_LUMINANCE,
320, 240, 0, GLES20.GL_LUMINANCE, GLES20.GL_UNSIGNED_BYTE, yBuffer);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
GLES20.glUniform1i(uTexture, 2);
GLES20.glTexImage2D( GLES20.GL_TEXTURE_2D, 0, GLES20.GL_LUMINANCE,
160, 120, 0, GLES20.GL_LUMINANCE, GLES20.GL_UNSIGNED_BYTE, uBuffer);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
GLES20.glUniform1i(vTexture, 3);
GLES20.glTexImage2D( GLES20.GL_TEXTURE_2D, 0, GLES20.GL_LUMINANCE,
160, 120, 0, GLES20.GL_LUMINANCE, GLES20.GL_UNSIGNED_BYTE, vBuffer);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
And this is my fragment shader code:
#ifdef GL_ES
precision highp float;
#endif
varying vec2 v_texCoord;
uniform sampler2D y_texture;
uniform sampler2D u_texture;
uniform sampler2D v_texture;
void main()
{
float nx,ny,r,g,b,y,u,v;
nx=v_texCoord.x;
ny=v_texCoord.y;
y=texture2D(y_texture,v_texCoord).r;
u=texture2D(u_texture,v_texCoord).r;
v=texture2D(v_texture,v_texCoord).r;
y=1.1643*(y-0.0625);
u=u-0.5;
v=v-0.5;
r=y+1.5958*v;
g=y-0.39173*u-0.81290*v;
b=y+2.017*u;
gl_FragColor = vec4(r,g,b,1.0);
}

I don't know if you solved your problem.
I used your code and I solved in this mode.
public class MyRenderer implements Renderer{
public static final int recWidth = Costanti.recWidth;
public static final int recHeight = Costanti.recHeight;
private static final int U_INDEX = recWidth*recHeight;
private static final int V_INDEX = recWidth*recHeight*5/4;
private static final int LENGTH = recWidth*recHeight;
private static final int LENGTH_4 = recWidth*recHeight/4;
private int previewFrameWidth = 256;
private int previewFrameHeight = 256;
private int[] yTextureNames;
private int[] uTextureNames;
private int[] vTextureNames;
private MainActivity activity;
private FloatBuffer mVertices;
private ShortBuffer mIndices;
private int mProgramObject;
private int mPositionLoc;
private int mTexCoordLoc;
private int yTexture;
private int uTexture;
private int vTexture;
private final float[] mVerticesData = { -1.f, 1.f, 0.0f, // Position 0
0.0f, 0.0f, // TexCoord 0
-1.f, -1.f, 0.0f, // Position 1
0.0f, 1.0f, // TexCoord 1
1.f, -1.f, 0.0f, // Position 2
1.0f, 1.0f, // TexCoord 2
1.f, 1.f, 0.0f, // Position 3
1.0f, 0.0f // TexCoord 3
};
private final short[] mIndicesData = { 0, 1, 2, 0, 2, 3 };
private ByteBuffer yBuffer;
private ByteBuffer uBuffer;
private ByteBuffer vBuffer;
private IntBuffer frameBuffer;
private IntBuffer renderBuffer;
private IntBuffer parameterBufferWidth;
private IntBuffer parameterBufferHeigth;
byte[] ydata = new byte[LENGTH];
byte[] uData = new byte[LENGTH_4];
byte[] vData = new byte[LENGTH_4];
public MyRenderer(MainActivity activity) {
this.activity = activity;
mVertices = ByteBuffer.allocateDirect(mVerticesData.length * 4)
.order(ByteOrder.nativeOrder()).asFloatBuffer();
mVertices.put(mVerticesData).position(0);
mIndices = ByteBuffer.allocateDirect(mIndicesData.length * 2)
.order(ByteOrder.nativeOrder()).asShortBuffer();
mIndices.put(mIndicesData).position(0);
yBuffer = MyGraphUtils.makeByteBuffer(LENGTH);
uBuffer = MyGraphUtils.makeByteBuffer(LENGTH_4/* * 2*/);
vBuffer = MyGraphUtils.makeByteBuffer(LENGTH_4);
}
#Override
public void onSurfaceChanged(GL10 gl, int width, int height) {
GLES20.glActiveTexture(GLES20.GL_ACTIVE_TEXTURE);
GLES20.glViewport(0, 0, width, height);
}
#Override
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
Log.d("debug", "on surface created");
// Define a simple shader program for our point.
final String vShaderStr = readTextFileFromRawResource(activity, R.raw.v_simple);
final String fShaderStr = readTextFileFromRawResource(activity, R.raw.f_convert);
frameBuffer = IntBuffer.allocate(1);
renderBuffer= IntBuffer.allocate(1);
GLES20.glEnable(GLES20.GL_TEXTURE_2D);
GLES20.glGenFramebuffers(1, frameBuffer);
GLES20.glGenRenderbuffers(1, renderBuffer);
GLES20.glActiveTexture(GLES20.GL_ACTIVE_TEXTURE);
GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, frameBuffer.get(0));
GLES20.glClear(0);
GLES20.glBindRenderbuffer(GLES20.GL_RENDERBUFFER, renderBuffer.get(0));
GLES20.glRenderbufferStorage(GLES20.GL_RENDERBUFFER, GLES20.GL_DEPTH_COMPONENT16,
320, 240);
parameterBufferHeigth = IntBuffer.allocate(1);
parameterBufferWidth = IntBuffer.allocate(1);
GLES20.glGetRenderbufferParameteriv(GLES20.GL_RENDERBUFFER, GLES20.GL_RENDERBUFFER_WIDTH, parameterBufferWidth);
GLES20.glGetRenderbufferParameteriv(GLES20.GL_RENDERBUFFER, GLES20.GL_RENDERBUFFER_HEIGHT, parameterBufferHeigth);
GLES20.glFramebufferRenderbuffer(GLES20.GL_FRAMEBUFFER, GLES20.GL_COLOR_ATTACHMENT0, GLES20.GL_RENDERBUFFER, renderBuffer.get(0));
if (GLES20.glCheckFramebufferStatus(GLES20.GL_FRAMEBUFFER)!=GLES20.GL_FRAMEBUFFER_COMPLETE){
Log.d("debug", "gl frame buffer status != frame buffer complete");
}
GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, 0);
GLES20.glClear(0);
mProgramObject = loadProgram(vShaderStr, fShaderStr);
// Get the attribute locations
mPositionLoc = GLES20.glGetAttribLocation(mProgramObject, "a_position");
mTexCoordLoc = GLES20.glGetAttribLocation(mProgramObject, "a_texCoord");
GLES20.glEnable(GLES20.GL_TEXTURE_2D);
yTexture = GLES20.glGetUniformLocation(mProgramObject, "y_texture");
yTextureNames = new int[1];
GLES20.glGenTextures(1, yTextureNames, 0);
int yTextureName = yTextureNames[0];
GLES20.glEnable(GLES20.GL_TEXTURE_2D);
uTexture = GLES20.glGetUniformLocation(mProgramObject, "u_texture");
uTextureNames = new int[1];
GLES20.glGenTextures(1, uTextureNames, 0);
int uTextureName = uTextureNames[0];
GLES20.glEnable(GLES20.GL_TEXTURE_2D);
vTexture = GLES20.glGetUniformLocation(mProgramObject, "v_texture");
vTextureNames = new int[1];
GLES20.glGenTextures(1, vTextureNames, 0);
int vTextureName = vTextureNames[0];
GLES20.glClearColor(1.0f, 0.0f, 0.0f, 0.0f);
}
#Override
public final void onDrawFrame(GL10 gl) {
Log.d("debug", "on Draw frame");
// Clear the color buffer
GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
// Use the program object
GLES20.glUseProgram(mProgramObject);
// Load the vertex position
mVertices.position(0);
GLES20.glVertexAttribPointer(mPositionLoc, 3, GLES20.GL_FLOAT, false, 5*4, mVertices);
// Load the texture coordinate
mVertices.position(3);
GLES20.glVertexAttribPointer(mTexCoordLoc, 2, GLES20.GL_FLOAT, false, 5*4, mVertices);
GLES20.glEnableVertexAttribArray(mPositionLoc);
GLES20.glEnableVertexAttribArray(mTexCoordLoc);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, yTextureNames[0]);
GLES20.glTexImage2D( GLES20.GL_TEXTURE_2D, 0, GLES20.GL_LUMINANCE,
320, 240, 0, GLES20.GL_LUMINANCE, GLES20.GL_UNSIGNED_BYTE, yBuffer);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
GLES20.glTexParameteri(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_CLAMP_TO_EDGE);
GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
GLES20.glActiveTexture(GLES20.GL_TEXTURE1);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, yTextureNames[0]);
GLES20.glUniform1i(yTexture, 0);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, uTextureNames[0]);
GLES20.glTexImage2D( GLES20.GL_TEXTURE_2D, 0, GLES20.GL_LUMINANCE,
160, 120, 0, GLES20.GL_LUMINANCE, GLES20.GL_UNSIGNED_BYTE, uBuffer);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
GLES20.glTexParameteri(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_CLAMP_TO_EDGE);
GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
GLES20.glActiveTexture(GLES20.GL_TEXTURE1+2);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, uTextureNames[0]);
GLES20.glUniform1i(uTexture, 2);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, vTextureNames[0]);
GLES20.glTexImage2D( GLES20.GL_TEXTURE_2D, 0, GLES20.GL_LUMINANCE,
160, 120, 0, GLES20.GL_LUMINANCE, GLES20.GL_UNSIGNED_BYTE, vBuffer);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
GLES20.glTexParameteri(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_CLAMP_TO_EDGE);
GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
GLES20.glActiveTexture(GLES20.GL_TEXTURE1+1);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, vTextureNames[0]);
GLES20.glUniform1i(vTexture, 1);
GLES20.glDrawElements(GLES20.GL_TRIANGLES, 6, GLES20.GL_UNSIGNED_SHORT, mIndices);
}
public void setPreviewFrameSize(int realWidth, int realHeight) {
previewFrameHeight = realHeight;
previewFrameWidth = realWidth;
}
public static String readTextFileFromRawResource(final Context context, final int resourceId) {
final InputStream inputStream = context.getResources().openRawResource(resourceId);
final InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
final BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String nextLine;
final StringBuilder body = new StringBuilder();
try {
while ((nextLine = bufferedReader.readLine()) != null) {
body.append(nextLine);
body.append('\n');
}
} catch (IOException e) {
return null;
}
return body.toString();
}
public static int loadShader(int type, String shaderSrc) {
int shader;
int[] compiled = new int[1];
// Create the shader object
shader = GLES20.glCreateShader(type);
if (shader == 0) {
return 0;
}
// Load the shader source
GLES20.glShaderSource(shader, shaderSrc);
// Compile the shader
GLES20.glCompileShader(shader);
// Check the compile status
GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, compiled, 0);
if (compiled[0] == 0) {
Log.e("ESShader", GLES20.glGetShaderInfoLog(shader));
GLES20.glDeleteShader(shader);
return 0;
}
return shader;
}
public static int loadProgram(String vertShaderSrc, String fragShaderSrc) {
int vertexShader;
int fragmentShader;
int programObject;
int[] linked = new int[1];
// Load the vertex/fragment shaders
vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertShaderSrc);
if (vertexShader == 0) {
return 0;
}
fragmentShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragShaderSrc);
if (fragmentShader == 0) {
GLES20.glDeleteShader(vertexShader);
return 0;
}
// Create the program object
programObject = GLES20.glCreateProgram();
if (programObject == 0) {
return 0;
}
GLES20.glAttachShader(programObject, vertexShader);
GLES20.glAttachShader(programObject, fragmentShader);
// Link the program
GLES20.glLinkProgram(programObject);
// Check the link status
GLES20.glGetProgramiv(programObject, GLES20.GL_LINK_STATUS, linked, 0);
if (linked[0] == 0) {
Log.e("ESShader", "Error linking program:");
Log.e("ESShader", GLES20.glGetProgramInfoLog(programObject));
GLES20.glDeleteProgram(programObject);
return 0;
}
// Free up no longer needed shader resources
GLES20.glDeleteShader(vertexShader);
GLES20.glDeleteShader(fragmentShader);
return programObject;
}
#Override
public void onPreviewFrame(byte[] data, Camera camera) {
System.arraycopy(data, 0, ydata, 0, LENGTH);
yBuffer.put(ydata);
yBuffer.position(0);
System.arraycopy(data, U_INDEX, uData, 0, LENGTH_4);
uBuffer.put(uData);
uBuffer.position(0);
System.arraycopy(data, V_INDEX, vData, 0, LENGTH_4);
vBuffer.put(vData);
vBuffer.position(0);
}
}

Not sure if you have already fixed this problem.My answer
By default Camera output is NV12, but in fragment shader YUV to RGB you are using YV12 -> RGB.
You will have to do
setPreviewFormat(ImageFormat.YV12);, or may be use some other shader
There are 3 textures , make sure you do
GLES20.glActiveTexture(GLES20.GL_TEXTURE2);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, muTextureName)
before call to any glTexImage2D. and glTexSubImage2D
You can also use glTexSubImage2D with every frame and glTexImage2D once.
size of U and V is same , atleast for YV12,
System.arraycopy(data, U_INDEX, uData, 0, LENGTH_4 * 2);
should be
System.arraycopy(data, U_INDEX, uData, 0, LENGTH_4);
change the size accordingly in the code.

For the fastest and most optimized way, just use the common GL Extention
//Fragment Shader
#extension GL_OES_EGL_image_external : require
uniform samplerExternalOES u_Texture;
Than in Java
surfaceTexture = new SurfaceTexture(textureIDs[0]);
try {
someCamera.setPreviewTexture(surfaceTexture);
} catch (IOException t) {
Log.e(TAG, "Cannot set preview texture target!");
}
someCamera.startPreview();
private static final int GL_TEXTURE_EXTERNAL_OES = 0x8D65;
In Java GL Thread
GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
GLES20.glBindTexture(GL_TEXTURE_EXTERNAL_OES, textureIDs[0]);
GLES20.glUniform1i(uTextureHandle, 0);
The color conversion is already done for you.
You can do what ever you want right in the Fragment shader.
Hope that saves you some time in your research.

Finally made your project display camera previews.
I found 2 problems:
1. Before binding and changing surface characteristics you have to call GLES20.glActiveTexture(GLES20.surfacenumber);
2. More important and hidden problem is that
GLES20.glTexImage2D() does not work with width and height, which are not power of 2 numbers.
After loading texture with size, for example, 1024X1024, you should call GLES20.glTexSubImage2D()
Good luck!

I applied the solution form How to render Android's YUV-NV21 camera image on the background in libgdx with OpenGLES 2.0 in real-time? to the project shared in the question and got a working project. If you are like me searching for tutorial code that does YUV to RGB conversion by fragment shader, you can simply do the following steps to get a working example.
Download the project https://dl.dropbox.com/u/12829395/application/FilterGL/FilterGL.zip and unzip.
Replace file GLRenderer.java and res/raw/f_convert.glsl entirely by the code shared below.
Open the project in Eclipse, or import the project to Android Studio.
The main issues of the code in the question are:
without GLES20.glActiveTexture(GLES20.GL_TEXTURE1);, yBuffer is not passed to GL.
the YUV data takes YUV-NV21 format, and u_texture and v_texture wasn't passed and handled correctly in the shader. Refer to this post for more information.
Now the corrected code: please replace GLRenderer.java with
package com.filtergl.shader;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import java.nio.ShortBuffer;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;
import android.content.Context;
import android.hardware.Camera;
import android.hardware.Camera.PreviewCallback;
import android.opengl.GLES20;
import android.opengl.GLSurfaceView.Renderer;
import android.util.Log;
public class GLRenderer
implements Renderer, PreviewCallback {
private static final int LENGTH = 76800;
private static final int LENGTH_2 = 38400;
private ActivityFilterGL activity;
private FloatBuffer mVertices;
private ShortBuffer mIndices;
private int previewFrameWidth = 256;
private int previewFrameHeight = 256;
private int mProgramObject;
private int mPositionLoc;
private int mTexCoordLoc;
// private int mSamplerLoc;
private int yTexture;
private int uTexture;
private int vTexture;
private final float[] mVerticesData = { -1.f, 1.f, 0.0f, // Position 0
0.0f, 0.0f, // TexCoord 0
-1.f, -1.f, 0.0f, // Position 1
0.0f, 1.0f, // TexCoord 1
1.f, -1.f, 0.0f, // Position 2
1.0f, 1.0f, // TexCoord 2
1.f, 1.f, 0.0f, // Position 3
1.0f, 0.0f // TexCoord 3
};
private final short[] mIndicesData = { 0, 1, 2, 0, 2, 3 };
private ByteBuffer frameData = null;
private ByteBuffer yBuffer;
private ByteBuffer uBuffer;
public GLRenderer(ActivityFilterGL activity) {
this.activity = activity;
mVertices = ByteBuffer.allocateDirect(mVerticesData.length * 4)
.order(ByteOrder.nativeOrder()).asFloatBuffer();
mVertices.put(mVerticesData).position(0);
mIndices = ByteBuffer.allocateDirect(mIndicesData.length * 2)
.order(ByteOrder.nativeOrder()).asShortBuffer();
mIndices.put(mIndicesData).position(0);
yBuffer = GraphicsUtil.makeByteBuffer(LENGTH);
uBuffer = GraphicsUtil.makeByteBuffer(LENGTH_2);
}
#Override
public final void onDrawFrame(GL10 gl) {
// Clear the color buffer
GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
// Use the program object
GLES20.glUseProgram(mProgramObject);
// Load the vertex position
mVertices.position(0);
GLES20.glVertexAttribPointer(mPositionLoc, 3, GLES20.GL_FLOAT, false, 5 * 4, mVertices);
// Load the texture coordinate
mVertices.position(3);
GLES20.glVertexAttribPointer(mTexCoordLoc, 2, GLES20.GL_FLOAT, false, 5 * 4, mVertices);
GLES20.glEnableVertexAttribArray(mPositionLoc);
GLES20.glEnableVertexAttribArray(mTexCoordLoc);
GLES20.glActiveTexture(GLES20.GL_TEXTURE1);
GLES20.glUniform1i(yTexture, 1);
GLES20.glTexImage2D( GLES20.GL_TEXTURE_2D, 0, GLES20.GL_LUMINANCE,
320, 240, 0, GLES20.GL_LUMINANCE, GLES20.GL_UNSIGNED_BYTE, yBuffer);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
GLES20.glTexParameteri(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_CLAMP_TO_EDGE);
GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
GLES20.glActiveTexture(GLES20.GL_TEXTURE2);
GLES20.glUniform1i(uTexture, 2);
GLES20.glTexImage2D( GLES20.GL_TEXTURE_2D, 0, GLES20.GL_LUMINANCE_ALPHA,
160, 120, 0, GLES20.GL_LUMINANCE_ALPHA, GLES20.GL_UNSIGNED_BYTE, uBuffer);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
GLES20.glTexParameteri(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_CLAMP_TO_EDGE);
GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
GLES20.glDrawElements(GLES20.GL_TRIANGLES, 6, GLES20.GL_UNSIGNED_SHORT, mIndices);
}
#Override
public void onSurfaceChanged(GL10 gl, int width, int height) {
GLES20.glViewport(0, 0, width, height);
}
#Override
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
// Define a simple shader program for our point.
final String vShaderStr = readTextFileFromRawResource(activity, R.raw.v_simple);
final String fShaderStr = readTextFileFromRawResource(activity, R.raw.f_convert);
// Load the shaders and get a linked program object
mProgramObject = loadProgram(vShaderStr, fShaderStr);
// Get the attribute locations
mPositionLoc = GLES20.glGetAttribLocation(mProgramObject, "a_position");
mTexCoordLoc = GLES20.glGetAttribLocation(mProgramObject, "a_texCoord");
GLES20.glEnable(GLES20.GL_TEXTURE_2D);
yTexture = GLES20.glGetUniformLocation(mProgramObject, "y_texture");
int[] yTextureNames = new int[1];
GLES20.glGenTextures(1, yTextureNames, 0);
int yTextureName = yTextureNames[0];
GLES20.glActiveTexture(GLES20.GL_TEXTURE1);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, yTextureName);
GLES20.glEnable(GLES20.GL_TEXTURE_2D);
uTexture = GLES20.glGetUniformLocation(mProgramObject, "u_texture");
int[] uTextureNames = new int[1];
GLES20.glGenTextures(1, uTextureNames, 0);
int uTextureName = uTextureNames[0];
GLES20.glActiveTexture(GLES20.GL_TEXTURE2);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, uTextureName);
// Set the background clear color to black.
GLES20.glClearColor(1.0f, 0.0f, 0.0f, 0.0f);
}
public void setPreviewFrameSize(int realWidth, int realHeight) {
previewFrameHeight = realHeight;
previewFrameWidth = realWidth;
// frameData = GraphicsUtil.makeByteBuffer(previewFrameHeight * previewFrameWidth * 3);
}
public static String readTextFileFromRawResource(final Context context, final int resourceId) {
final InputStream inputStream = context.getResources().openRawResource(resourceId);
final InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
final BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String nextLine;
final StringBuilder body = new StringBuilder();
try {
while ((nextLine = bufferedReader.readLine()) != null) {
body.append(nextLine);
body.append('\n');
}
} catch (IOException e) {
return null;
}
return body.toString();
}
public static int loadShader(int type, String shaderSrc) {
int shader;
int[] compiled = new int[1];
// Create the shader object
shader = GLES20.glCreateShader(type);
if (shader == 0) {
return 0;
}
// Load the shader source
GLES20.glShaderSource(shader, shaderSrc);
// Compile the shader
GLES20.glCompileShader(shader);
// Check the compile status
GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, compiled, 0);
if (compiled[0] == 0) {
Log.e("ESShader", GLES20.glGetShaderInfoLog(shader));
GLES20.glDeleteShader(shader);
return 0;
}
return shader;
}
public static int loadProgram(String vertShaderSrc, String fragShaderSrc) {
int vertexShader;
int fragmentShader;
int programObject;
int[] linked = new int[1];
// Load the vertex/fragment shaders
vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertShaderSrc);
if (vertexShader == 0) {
return 0;
}
fragmentShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragShaderSrc);
if (fragmentShader == 0) {
GLES20.glDeleteShader(vertexShader);
return 0;
}
// Create the program object
programObject = GLES20.glCreateProgram();
if (programObject == 0) {
return 0;
}
GLES20.glAttachShader(programObject, vertexShader);
GLES20.glAttachShader(programObject, fragmentShader);
// Link the program
GLES20.glLinkProgram(programObject);
// Check the link status
GLES20.glGetProgramiv(programObject, GLES20.GL_LINK_STATUS, linked, 0);
if (linked[0] == 0) {
Log.e("ESShader", "Error linking program:");
Log.e("ESShader", GLES20.glGetProgramInfoLog(programObject));
GLES20.glDeleteProgram(programObject);
return 0;
}
// Free up no longer needed shader resources
GLES20.glDeleteShader(vertexShader);
GLES20.glDeleteShader(fragmentShader);
return programObject;
}
#Override
public void onPreviewFrame(byte[] data, Camera camera) {
yBuffer.put(data, 0, LENGTH);
yBuffer.position(0);
uBuffer.put(data, LENGTH, LENGTH/2);
uBuffer.position(0);
}
}
and replace f_convert.glsl with
#ifdef GL_ES
precision highp float;
#endif
varying vec2 v_texCoord;
uniform sampler2D y_texture;
uniform sampler2D u_texture;
void main()
{
float r, g, b, y, u, v;
//We had put the Y values of each pixel to the R,G,B components by
//GL_LUMINANCE, that's why we're pulling it from the R component,
//we could also use G or B
y = texture2D(y_texture, v_texCoord).r;
//We had put the U and V values of each pixel to the A and R,G,B
//components of the texture respectively using GL_LUMINANCE_ALPHA.
//Since U,V bytes are interspread in the texture, this is probably
//the fastest way to use them in the shader
u = texture2D(u_texture, v_texCoord).a - 0.5;
v = texture2D(u_texture, v_texCoord).r - 0.5;
//The numbers are just YUV to RGB conversion constants
r = y + 1.13983*v;
g = y - 0.39465*u - 0.58060*v;
b = y + 2.03211*u;
gl_FragColor = vec4(r,g,b,1.0);
}

Black screen instead of multi-texturing

I have checked the textures individually, they work fine.
Each of the textures are 128*128 pixels, I am working on Motorola MILESTONE mobile,
and have tested all basic examples (from line to cubemap), got stuck while multitexturing
rectangle.
The shader works well if I do not bind any one of the textures, but the problem starts with two textures for multitexturing.
private float[] myRotateMatrix = new float[16];
private float[] myViewMatrix = new float[16];
private float[] myProjectionMatrix = new float[16];
private float[] myMVPMatrix = new float[16];
private int aPositionLocation;
private int uMVPLocation;
private int aTextureCoordLocation;
private FloatBuffer rectangleVFB;
private ShortBuffer rectangleISB;
private FloatBuffer textureCFB;
private int program;
private int textureId1;
private int textureId2;
private int uSampler1Location;
private int uSampler2Location;
private void initShapes() {
float[] rectangleVFA = {-1,-1,0, 1,-1,0, 1,1,0, -1,1,0};
short[] rectangleISA = {0,1,2, 0,3,2};
float[] textureCFA = {0,0, 1,0, 1,1, 0,1};
ByteBuffer rectangleVBB = ByteBuffer.allocateDirect(rectangleVFA.length * 4);
rectangleVBB.order(ByteOrder.nativeOrder());
rectangleVFB = rectangleVBB.asFloatBuffer();
rectangleVFB.put(rectangleVFA);
rectangleVFB.position(0);
ByteBuffer rectangleIBB = ByteBuffer.allocateDirect(rectangleISA.length * 2);
rectangleIBB.order(ByteOrder.nativeOrder());
rectangleISB = rectangleIBB.asShortBuffer();
rectangleISB.put(rectangleISA);
rectangleISB.position(0);
ByteBuffer textureCBB = ByteBuffer.allocateDirect(textureCFA.length * 4);
textureCBB.order(ByteOrder.nativeOrder());
textureCFB = textureCBB.asFloatBuffer();
textureCFB.put(textureCFA);
textureCFB.position(0);
}
public void onSurfaceChanged(GL10 gl, int width, int height) {
GLES20.glViewport(0, 0, width, height);
checkError("glViewport");
float ratio = (float) width / height;
Matrix.setLookAtM(myViewMatrix, 0, 0, 0, 6, 0, 0, 0, 0, 1, 0);
Matrix.frustumM(myProjectionMatrix, 0, -ratio, ratio, -1, 1, 3, 7);
aPositionLocation = GLES20.glGetAttribLocation(program, "aPosition");
checkError("glGetAttribLocation");
uMVPLocation = GLES20.glGetUniformLocation(program, "uMVP");
checkError("glGetUniformLocation");
aTextureCoordLocation = GLES20.glGetAttribLocation(program, "aTextureCoord");
checkError("glGetAttribLocation");
uSampler1Location = GLES20.glGetUniformLocation(program, "uSampler1");
checkError("glGetUniformLocation");
uSampler2Location = GLES20.glGetUniformLocation(program, "uSampler2");
checkError("glGetUniformLocation");
int[] textures = new int[2];
GLES20.glGenTextures(2, textures, 0);
checkError("glGenTextures");
textureId1 = textures[0];
textureId2 = textures[1];
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureId1);
checkError("glBindTexture");
InputStream is1 = context.getResources().openRawResource(R.drawable.brick1);
Bitmap img1;
try {
img1 = BitmapFactory.decodeStream(is1);
}finally {
try {
is1.close();
}catch (IOException ioe) {
}
}
GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, img1, 0);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureId2);
checkError("glBindTexture");
InputStream is2 = context.getResources().openRawResource(R.drawable.brick2);
Bitmap img2;
try {
img2 = BitmapFactory.decodeStream(is2);
}finally {
try {
is2.close();
}catch (IOException ioe) {
}
}
GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, img2, 0);
GLES20.glPixelStorei(GLES20.GL_UNPACK_ALIGNMENT, 1);
GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
}
public void onDrawFrame(GL10 gl) {
GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);
checkError("glClear");
GLES20.glUseProgram(program);
checkError("glUseProgram");
GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
checkError("glActiveTexture");
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureId1);
checkError("glBindTexture");
GLES20.glUniform1i(uSampler1Location, 0);
checkError("glUniform1i");
GLES20.glActiveTexture(GLES20.GL_TEXTURE1);
checkError("glActiveTexture");
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureId2);
checkError("glBindTexture");
GLES20.glUniform1i(uSampler2Location, 1);
checkError("glUniform1i");
Matrix.setIdentityM(myRotateMatrix, 0);
Matrix.rotateM(myRotateMatrix, 0, touchX, 0, 1, 0);
Matrix.rotateM(myRotateMatrix, 0, touchY, 1, 0, 0);
Matrix.multiplyMM(myMVPMatrix, 0, myViewMatrix, 0, myRotateMatrix, 0);
Matrix.multiplyMM(myMVPMatrix, 0, myProjectionMatrix, 0, myMVPMatrix, 0);
GLES20.glVertexAttribPointer(aPositionLocation, 3, GLES20.GL_FLOAT, false, 12, rectangleVFB);
checkError("glVertexAttribPointer");
GLES20.glEnableVertexAttribArray(aPositionLocation);
checkError("glEnableVertexAttribArray");
GLES20.glVertexAttribPointer(aTextureCoordLocation, 2, GLES20.GL_FLOAT, false, 8, textureCFB);
checkError("glVertexAttribPointer");
GLES20.glEnableVertexAttribArray(aTextureCoordLocation);
checkError("glEnableVertexAttribArray");
GLES20.glUniformMatrix4fv(uMVPLocation, 1, false, myMVPMatrix, 0);
checkError("glUniformMatrix4fv");
GLES20.glDrawElements(GLES20.GL_TRIANGLES, 6, GLES20.GL_UNSIGNED_SHORT, rectangleISB);
checkError("glDrawElements");
}

In OpenGL ES 2.0, after every call to glBindTexture and before texImage2D the parameters for that texture have to be specified seperately.
So, if there are 2 textures (as in multitexturing) then it will require 4 glTexParameterf each for texture 1 and 2, total 8.

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

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