Android Ice Cream Sandwich'te GLSurfaceView ile TextureView ile nasıl değiştirilir?

Question

TextureView documentation, OpenGL içeriğini oluşturmak için kullanılabileceğini belirtir. blog post duyuran TextureView yılında

belirtir:

A TextureView gibi kolayca uygulamada bir OpenGL Sahne gömmek için kullanılabilir. Android 4.0'dan itibaren, bir SurfaceTexture nesnesine işlemek için eglCreateWindowSurface() kullanılabilir. yerine GLSurfaceView ait TextureView kullanmayı ima görünüyor

, tek tüm EGL setup kendilerini yapmak ve (GLSurfaceView bir GLTHREAD tutar beri) EGLContext ve diş yönetmek gerekir. Android 4.0 SDK'da "TextureView ürününün bir OpenGL sahnesini yerleştirmek için nasıl kolayca kullanılabileceğini gösteren örnek bir kod yok gibi görünüyor." TextureView, Kamera önizlemesine (setPreviewTexture) ve MediaPlayer'a (setSurface) daha temiz bir şekilde takılıyor gibi görünüyor.

GLSurfaceView, TextureView ile SurfaceSexture oluşturulmasını sağlamak için GLSurfaceView.setEGLWindowSurfaceFactory kullanarak TextureView ile birlikte kullanılabilir mi? Bazı örnek kod olsaydı

Yine, çok güzel olurdu.

Answer 1

Bir moderatör bu cevap çok kuşaklar için yeniden eklemeyi silindi:

Bkz Romain Guy cevabı android-dev google grubundan (23 Kasım 2011):

http://groups.google.com/group/android-developers/browse_thread/thread/539457146a401cf1 (yansıtılmış: http://grokbase.com/t/gg/android-developers/11bqmgb7sw/how-to-replace-glsurfaceview-with-textureview-in-android-ice-cream-sandwich)

GLSurfaceView, GL ayarını sizin için yapar; Bir TextureView, bir EGL yüzeyi oluşturduğunuzda yerel pencere olarak kullanılabilir. İşte bir örnek (ilginç kısmı çağrısı eglCreateWindowSurface() 'dir):

@Override 
public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) { 
    mRenderThread = new RenderThread(getResources(), surface); 
    mRenderThread.start(); 
} 

private static class RenderThread extends Thread { 
    private static final String LOG_TAG = "GLTextureView"; 

    static final int EGL_CONTEXT_CLIENT_VERSION = 0x3098; 
    static final int EGL_OPENGL_ES2_BIT = 4; 

    private volatile boolean mFinished; 

    private final Resources mResources; 
    private final SurfaceTexture mSurface; 

    private EGL10 mEgl; 
    private EGLDisplay mEglDisplay; 
    private EGLConfig mEglConfig; 
    private EGLContext mEglContext; 
    private EGLSurface mEglSurface; 
    private GL mGL; 

    RenderThread(Resources resources, SurfaceTexture surface) { 
     mResources = resources; 
     mSurface = surface; 
    } 

    private static final String sSimpleVS = 
      "attribute vec4 position;\n" + 
      "attribute vec2 texCoords;\n" + 
      "varying vec2 outTexCoords;\n" + 
      "\nvoid main(void) {\n" + 
      " outTexCoords = texCoords;\n" + 
      " gl_Position = position;\n" + 
      "}\n\n"; 
    private static final String sSimpleFS = 
      "precision mediump float;\n\n" + 
      "varying vec2 outTexCoords;\n" + 
      "uniform sampler2D texture;\n" + 
      "\nvoid main(void) {\n" + 
      " gl_FragColor = texture2D(texture, outTexCoords);\n" + 
      "}\n\n"; 

    private static final int FLOAT_SIZE_BYTES = 4; 
    private static final int TRIANGLE_VERTICES_DATA_STRIDE_BYTES = 5 * FLOAT_SIZE_BYTES; 
    private static final int TRIANGLE_VERTICES_DATA_POS_OFFSET = 0; 
    private static final int TRIANGLE_VERTICES_DATA_UV_OFFSET = 3; 
    private final float[] mTriangleVerticesData = { 
      // X, Y, Z, U, V 
      -1.0f, -1.0f, 0.0f, 0.0f, 0.0f, 
       1.0f, -1.0f, 0.0f, 1.0f, 0.0f, 
      -1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 
       1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 
    }; 

    @Override 
    public void run() { 
     initGL(); 

     FloatBuffer triangleVertices = ByteBuffer.allocateDirect(mTriangleVerticesData.length * FLOAT_SIZE_BYTES).order(ByteOrder.nativeOrder()).asFloatBuffer(); 
     triangleVertices.put(mTriangleVerticesData).position(0); 

     int texture = loadTexture(R.drawable.large_photo); 
     int program = buildProgram(sSimpleVS, sSimpleFS); 

     int attribPosition = glGetAttribLocation(program, "position"); 
     checkGlError(); 

     int attribTexCoords = glGetAttribLocation(program, "texCoords"); 
     checkGlError(); 

     int uniformTexture = glGetUniformLocation(program, "texture"); 
     checkGlError(); 

     glBindTexture(GL_TEXTURE_2D, texture); 
     checkGlError(); 

     glUseProgram(program); 
     checkGlError(); 

     glEnableVertexAttribArray(attribPosition); 
     checkGlError(); 

     glEnableVertexAttribArray(attribTexCoords); 
     checkGlError(); 

     glUniform1i(uniformTexture, texture); 
     checkGlError(); 

     while (!mFinished) { 
      checkCurrent(); 

      glClearColor(0.0f, 0.0f, 0.0f, 0.0f); 
      checkGlError(); 

      glClear(GL_COLOR_BUFFER_BIT); 
      checkGlError(); 

      // drawQuad 

      triangleVertices.position(TRIANGLE_VERTICES_DATA_POS_OFFSET); 
      glVertexAttribPointer(attribPosition, 3, GL_FLOAT, false, 
        TRIANGLE_VERTICES_DATA_STRIDE_BYTES, triangleVertices); 

      triangleVertices.position(TRIANGLE_VERTICES_DATA_UV_OFFSET); 
      glVertexAttribPointer(attribTexCoords, 3, GL_FLOAT, false, 
        TRIANGLE_VERTICES_DATA_STRIDE_BYTES, triangleVertices); 

      glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); 

      if (!mEgl.eglSwapBuffers(mEglDisplay, mEglSurface)) { 
       throw new RuntimeException("Cannot swap buffers"); 
      } 
      checkEglError(); 

      try { 
       Thread.sleep(2000); 
      } catch (InterruptedException e) { 
       // Ignore 
      } 
     } 

     finishGL(); 
    } 

    private int loadTexture(int resource) { 
     int[] textures = new int[1]; 

     glActiveTexture(GL_TEXTURE0); 
     glGenTextures(1, textures, 0); 
     checkGlError(); 

     int texture = textures[0]; 
     glBindTexture(GL_TEXTURE_2D, texture); 
     checkGlError(); 

     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); 
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); 

     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); 
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); 

     Bitmap bitmap = BitmapFactory.decodeResource(mResources, resource); 

     GLUtils.texImage2D(GL_TEXTURE_2D, 0, GL_RGBA, bitmap, GL_UNSIGNED_BYTE, 0); 
     checkGlError(); 

     bitmap.recycle(); 

     return texture; 
    } 

    private int buildProgram(String vertex, String fragment) { 
     int vertexShader = buildShader(vertex, GL_VERTEX_SHADER); 
     if (vertexShader == 0) return 0; 

     int fragmentShader = buildShader(fragment, GL_FRAGMENT_SHADER); 
     if (fragmentShader == 0) return 0; 

     int program = glCreateProgram(); 
     glAttachShader(program, vertexShader); 
     checkGlError(); 

     glAttachShader(program, fragmentShader); 
     checkGlError(); 

     glLinkProgram(program); 
     checkGlError(); 

     int[] status = new int[1]; 
     glGetProgramiv(program, GL_LINK_STATUS, status, 0); 
     if (status[0] != GL_TRUE) { 
      String error = glGetProgramInfoLog(program); 
      Log.d(LOG_TAG, "Error while linking program:\n" + error); 
      glDeleteShader(vertexShader); 
      glDeleteShader(fragmentShader); 
      glDeleteProgram(program); 
      return 0; 
     } 

     return program; 
    } 

    private int buildShader(String source, int type) { 
     int shader = glCreateShader(type); 

     glShaderSource(shader, source); 
     checkGlError(); 

     glCompileShader(shader); 
     checkGlError(); 

     int[] status = new int[1]; 
     glGetShaderiv(shader, GL_COMPILE_STATUS, status, 0); 
     if (status[0] != GL_TRUE) { 
      String error = glGetShaderInfoLog(shader); 
      Log.d(LOG_TAG, "Error while compiling shader:\n" + error); 
      glDeleteShader(shader); 
      return 0; 
     } 

     return shader; 
    } 

    private void checkEglError() { 
     int error = mEgl.eglGetError(); 
     if (error != EGL10.EGL_SUCCESS) { 
      Log.w(LOG_TAG, "EGL error = 0x" + Integer.toHexString(error)); 
     } 
    } 

    private void checkGlError() { 
     int error = glGetError(); 
     if (error != GL_NO_ERROR) { 
      Log.w(LOG_TAG, "GL error = 0x" + Integer.toHexString(error)); 
     } 
    } 

    private void finishGL() { 
     mEgl.eglDestroyContext(mEglDisplay, mEglContext); 
     mEgl.eglDestroySurface(mEglDisplay, mEglSurface); 
    } 

    private void checkCurrent() { 
     if (!mEglContext.equals(mEgl.eglGetCurrentContext()) || 

     !mEglSurface.equals(mEgl.eglGetCurrentSurface(EGL10.EGL_DRAW))) { 
      if (!mEgl.eglMakeCurrent(mEglDisplay, mEglSurface, mEglSurface, mEglContext)) { 
       throw new RuntimeException("eglMakeCurrent failed " + GLUtils.getEGLErrorString(mEgl.eglGetError())); 
      } 
     } 
    } 

    private void initGL() { 
     mEgl = (EGL10) EGLContext.getEGL(); 

     mEglDisplay = mEgl.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY); 
     if (mEglDisplay == EGL10.EGL_NO_DISPLAY) { 
      throw new RuntimeException("eglGetDisplay failed " 
        + GLUtils.getEGLErrorString(mEgl.eglGetError())); 
     } 

     int[] version = new int[2]; 
     if (!mEgl.eglInitialize(mEglDisplay, version)) { 
      throw new RuntimeException("eglInitialize failed " + 
        GLUtils.getEGLErrorString(mEgl.eglGetError())); 
     } 

     mEglConfig = chooseEglConfig(); 
     if (mEglConfig == null) { 
      throw new RuntimeException("eglConfig not initialized"); 
     } 

     mEglContext = createContext(mEgl, mEglDisplay, mEglConfig); 

     mEglSurface = mEgl.eglCreateWindowSurface(mEglDisplay, mEglConfig, mSurface, null); 

     if (mEglSurface == null || mEglSurface == EGL10.EGL_NO_SURFACE) 
     { 
      int error = mEgl.eglGetError(); 
      if (error == EGL10.EGL_BAD_NATIVE_WINDOW) { 
       Log.e(LOG_TAG, "createWindowSurface returned EGL_BAD_NATIVE_WINDOW."); 
       return; 
      } 
      throw new RuntimeException("createWindowSurface failed " 
        + GLUtils.getEGLErrorString(error)); 
     } 

     if (!mEgl.eglMakeCurrent(mEglDisplay, mEglSurface, mEglSurface, mEglContext)) { 
      throw new RuntimeException("eglMakeCurrent failed " 
        + GLUtils.getEGLErrorString(mEgl.eglGetError())); 
     } 

     mGL = mEglContext.getGL(); 
    } 


    EGLContext createContext(EGL10 egl, EGLDisplay eglDisplay, EGLConfig eglConfig) { 
     int[] attrib_list = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL10.EGL_NONE }; 
     return egl.eglCreateContext(eglDisplay, eglConfig, EGL10.EGL_NO_CONTEXT, attrib_list); 
    } 

    private EGLConfig chooseEglConfig() { 
     int[] configsCount = new int[1]; 
     EGLConfig[] configs = new EGLConfig[1]; 
     int[] configSpec = getConfig(); 
     if (!mEgl.eglChooseConfig(mEglDisplay, configSpec, configs, 1, configsCount)) { 
      throw new IllegalArgumentException("eglChooseConfig failed " + 
        GLUtils.getEGLErrorString(mEgl.eglGetError())); 
     } else if (configsCount[0] > 0) { 
      return configs[0]; 
     } 
     return null; 
    } 

    private int[] getConfig() { 
     return new int[] { 
       EGL10.EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT, 
       EGL10.EGL_RED_SIZE, 8, 
       EGL10.EGL_GREEN_SIZE, 8, 
       EGL10.EGL_BLUE_SIZE, 8, 
       EGL10.EGL_ALPHA_SIZE, 8, 
       EGL10.EGL_DEPTH_SIZE, 0, 
       EGL10.EGL_STENCIL_SIZE, 0, 
       EGL10.EGL_NONE 
     }; 
    } 

    void finish() { 
     mFinished = true; 
    } 
} 

Answer 2

Daha önce bahsedilen @fadden gibi, TextureView'u kullanarak güzel bir örneğiniz var: https://github.com/google/grafika/blob/master/src/com/android/grafika/TextureViewGLActivity.java.

GLSurfaceView ve TextureView birbirini dışlar. Her ikisine birden sahip olmak için bir kullanım durumu göremiyorum.