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¿Cómo reemplazar GLSurfaceView con TextureView en Android Ice Cream Sandwich? (2)

La documentation TextureView indica que se puede usar para representar contenido de OpenGL.

En la publicación del blog que anuncia TextureView, dice:

Un TextureView se puede usar con la misma facilidad para incrustar una escena OpenGL en su aplicación. A partir de Android 4.0, eglCreateWindowSurface () se puede usar para representar un objeto SurfaceTexture.

Lo que parece implicar que para usar TextureView en lugar de GLSurfaceView, uno tendría que hacer ellos mismos toda la configuración de EGL y administrar EGLContext y el threading (ya que GLSurfaceView mantiene un GLThread). No parece haber ningún código de muestra en el SDK de Android 4.0 que demuestre cómo " TextureView se puede usar con la misma facilidad para incrustar una escena OpenGL ". TextureView parece conectarse más limpiamente a la vista previa de la cámara (setPreviewTexture) y MediaPlayer (setSurface).

¿Es posible utilizar GLSurfaceView junto con TextureView utilizando GLSurfaceView.setEGLWindowSurfaceFactory para hacer que se represente en SurfaceTexture de TextureView?

Una vez más, sería bueno si hubiera algún código de ejemplo.


Un moderador eliminó esta respuesta, por lo que la vuelve a agregar para la posteridad:

Vea la respuesta de Romain Guy (23 de noviembre de 2011) del grupo de android-dev google:

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

GLSurfaceView maneja la configuración de GL por usted, lo que TextureView no hará. Un TextureView se puede usar como la ventana nativa cuando crea una superficie EGL. Aquí hay un ejemplo (la parte interesante es la llamada a eglCreateWindowSurface ()):

@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; } }