CL GL Interop:CL 上下文创建参数

CL GL Interop: CL context creation parameters

我一直在尝试创建一个绑定到 OpenGL 上下文的 OpenCL 上下文。我未能找到 KHRGLSharing.clGetGLContextInfoKHR 方法查询可用设备所需的 properties 参数的适当值。 OpenGL 上下文是使用 GLFW 创建的,我想要使用的 window 是当前上下文(使用 glfwMakeContextCurrent 设置)

下面的代码片段显示了我到目前为止的想法:

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:我不知道要为 CL_CONTEXT_PLATFORMCL_GL_CONTEXT_KHRCL_GLX_DISPLAY_KHR 传递什么值。当前使用 SIGSEGV.

使 JVM 崩溃

Windows:代码有效,但我不确定这是否是正确的方法。

Apple:我没有机器可以测试它,但如果我也知道那里的正确参数,我将不胜感激。

Intel 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

,则代码片段应该适用于 Linux