JavaFX 0x300b:无法获得EGL曲面

Question

在嵌入式环境(buildroot)中，我试图在raspaberry pi 3上运行javafx示例，当我运行命令时，我想不使用X来运行它：

/root/jre-13.0.1/bin/java  -Dfile.encoding=UTF-8 --add-modules javafx.controls,javafx.fxml -Dprism.verbose=true -Djavafx.verbose=true -Dglass.platform=Monocle -Dprism.order=es2 -Djava.library.path=/root/jre-13.0.1/lib/ -Dembedded=monocle   -jar /home/root/NetBeansProjects//JavaFXFXML/dist/JavaFXFXML.jar 

我得到以下错误：

cmd : cd '/home/root/NetBeansProjects//JavaFXFXML'; '/root/jre-13.0.1//bin/java'  -Dfile.encoding=UTF-8 --add-modules javafx.controls,javafx.fxml -Dprism.verbose=true -Djavafx.verbose=true -Dglass.platform=Monocle -Dprism.order=es2 -Djava.library.path=/root/jre-13.0.1/lib/ -Dembedded=monocle   -jar /home/root/NetBeansProjects//JavaFXFXML/dist/JavaFXFXML.jar 
JavaFX launchApplication method: launchMode=LM_JAR
Prism pipeline init order: 
es2 
Using Double Precision Marlin Rasterizer
Using dirty region optimizations
Using system sized mask for primitives
Not 
f
orcing power of 2 sizes for textures
Using hardware CLAMP_TO_ZERO mode
Opting in for HiDPI pixel scaling
Prism pipeline name = com.sun.prism.es2.ES2Pipeline
Loading ES2 native library ... prism_es2_monocle
Loaded /root/jre-13.0.1/lib/libprism_es2_monocle.so from java.library.path
    succeeded.
GLFactory using com.sun.prism.es2.MonocleGLFactory
Loaded /root/jre-13.0.1/lib/libglass_monocle.so from java.library.path
com.sun.glass.ui.monocle.GLException: 0x300b: Could not get EGL surface
    at javafx.graphics/com.sun.glass.ui.monocle.AcceleratedScreen.<init>(Unknown Source)
    at javafx.graphics/com.sun.glass.ui.monocle.NativePlatform.getAcceleratedScreen(Unknown Source)
    at javafx.graphics/com.sun.prism.es2.MonocleGLFactory.initialize(Unknown Source)
    at javafx.graphics/com.sun.prism.es2.ES2Pipeline.<clinit>(Unknown Source)
    at java.base/java.lang.Class.forName0(Native Method)
    at java.base/java.lang.Class.forName(Unknown Source)
    at javafx.graphics/com.sun.prism.GraphicsPipeline.createPipeline(Unknown Source)
    at javafx.graphics/com.sun.javafx.tk.quantum.QuantumRenderer$PipelineRunnable.init(Unknown Source)
    at javafx.graphics/com.sun.javafx.tk.quantum.QuantumRenderer$PipelineRunnable.run(Unknown Source)
    at java.base/java.lang.Thread.run(Unknown Source)
(X) Got class = class com.sun.prism.es2.ES2Pipeline
GraphicsPipeline.createPipeline: error initializing pipeline com.sun.prism.es2.ES2Pipeline
Graphics Device initialization failed for :  es2

我运行了hello_triangle和hello_dispmanx示例来测试gpu的访问，在那里没有问题。不知道我为什么要得到Could not get EGL surface错误，有没有办法调试这个错误？

Java设置：

# java --version
openjdk 13.0.1-BellSoft 2019-10-15
OpenJDK Runtime Environment (build 13.0.1-BellSoft+9)
OpenJDK Server VM (build 13.0.1-BellSoft+9, mixed mode)

Answer 1

我终于明白了..。由于我使用的是buildroot，所以所有raspberry pi用户(GPU)库都在/usr/lib文件夹中。但是，深入到单体源代码中，更确切地说，在DispmanPlatformFactory.java中，我们可以看到它们与平台匹配的方式是在/opt/vc/lib中搜索不存在于buildroot配置中的libbcm_host.so。对于那些使用buildroot的人来说，一个快速的解决方法是创建一个指向libbcm_host.so in /opt/vc/lib的符号链接。