Tag: egl

用EGL_KHR_image_base代替glReadPixels以获得更快的像素复制

我试图在Android本机进程中使用EGL_KHR_image_base，以取代glReadPixels，因为它是慢（1280×800 RGBA 220毫秒）。 这是我到目前为止，但我产生一个空的缓冲区（只有零） uint8_t *ptr; GLuint mTexture; status_t error; GraphicBufferAlloc* mGraphicBufferAlloc = new GraphicBufferAlloc(); sp<GraphicBuffer> window = mGraphicBufferAlloc->createGraphicBuffer(width, height, PIXEL_FORMAT_RGBA_8888, GraphicBuffer::USAGE_SW_READ_OFTEN | GraphicBuffer::USAGE_HW_TEXTURE,&error); EGLClientBuffer buffer = (EGLClientBuffer)window->getNativeBuffer(); EGLint eglImageAttributes[] = {EGL_WIDTH, width, EGL_HEIGHT, height, EGL_MATCH_FORMAT_KHR, EGL_FORMAT_RGBA_8888_KHR, EGL_IMAGE_PRESERVED_KHR, EGL_TRUE, EGL_NONE}; EGLImageKHR image = eglCreateImageKHR(eglGetCurrentDisplay(), EGL_NO_CONTEXT, EGL_NATIVE_BUFFER_ANDROID,buffer, eglImageAttributes); glGenTextures(1, &mTexture); glBindTexture(GL_TEXTURE_2D, mTexture); glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, image); window->lock(GraphicBuffer::USAGE_SW_READ_OFTEN, (void**)&ptr); […]