CL GL Interop: CL上下文创建参数

Question

我一直在尝试创建一个绑定到OpenGL上下文的OpenCL上下文。我找不到KHRGLSharing.clGetGLContextInfoKHR方法查询可用设备所需的properties参数的相应值。OpenGL上下文是使用GLFW创建的，我想使用的窗口是当前上下文(使用glfwMakeContextCurrent设置)

下面的代码片段展示了我到目前为止想出的东西：

public static List<Long> queryDevicesForPlatform(long platform) {
        stack.push(); // MemoryStack defined elsewhere
        //Create properties
        //Problematic piece of code
        long[] properties =  switch (Platform.get()) {
            //These parameters let the JVM crash when clGetGLContextInfoKHR is called
            case LINUX -> new long[]{
                    CL_CONTEXT_PLATFORM, platform,
                    CL_GL_CONTEXT_KHR, GLX14.glXGetCurrentContext(),
                    CL_GLX_DISPLAY_KHR, GLX14.glXGetCurrentDisplay(),
                    0
            };
            //Not yet tested
            case MACOSX -> new long[]{
                    CL_CONTEXT_PLATFORM, platform,
                    CL_CGL_SHAREGROUP_KHR, CGL.CGLGetShareGroup(CGL.CGLGetCurrentContext()),
                    0
            };
            //This one works
            case WINDOWS -> new long[]{
                    CL_CONTEXT_PLATFORM, platform,
                    CL_GL_CONTEXT_KHR, glfwGetCurrentContext(),
                    CL_WGL_HDC_KHR, wglGetCurrentDC(),
                    0
            };
        };

        //Copy properties to a buffer
        ByteBuffer byteProp = stack.malloc(properties.length * Long.BYTES);
        byteProp.asLongBuffer().put(properties);
        ByteBuffer bytes = stack.malloc(Long.BYTES);

        //JVM crashes here
        int error = KHRGLSharing.clGetGLContextInfoKHR(PointerBuffer.create(byteProp),
                CL_DEVICES_FOR_GL_CONTEXT_KHR, (ByteBuffer) null, PointerBuffer.create(bytes));
        assert error == CL22.CL_SUCCESS: error;

        ByteBuffer value = stack.malloc((int) bytes.asLongBuffer().get(0));
        error = KHRGLSharing.clGetGLContextInfoKHR(PointerBuffer.create(byteProp), CL_DEVICES_FOR_GL_CONTEXT_KHR, value, null);
        assert error == CL22.CL_SUCCESS: error;
        LongBuffer devices = value.asLongBuffer();

        ArrayList<Long> ret = new ArrayList<>();
        while(devices.hasRemaining()) {
            ret.add(devices.get());
        }

        stack.pop();
        return ret;
    }

Linux:我不知道应该为CL_CONTEXT_PLATFORM、CL_GL_CONTEXT_KHR和CL_GLX_DISPLAY_KHR传递什么值。当前使用SIGSEGV使JVM崩溃。

Windows:代码可以工作，但我不确定这是不是正确的方法。

苹果:我没有机器来测试它，但如果我也知道正确的参数，我会很感激。

Answer 1

英特尔的Linux驱动程序不支持CL-GL互操作(它缺少cl_khr_gl_sharing扩展)。如果驱动程序支持CL-GL互操作，则代码片段应在Linux上工作