使OpenCL在Qt5中与OpenGL配合使用的正确方法是什么? [英] What is the correct way to get OpenCL to play nice with OpenGL in Qt5?
问题描述
我已经找到了一些非官方资源，以了解如何使OpenCL在OpenGL和Qt5上能够很好地发挥作用，每种资源都有不同的复杂度:
I have found several unofficial sources for how to get OpenCL to play nice with OpenGL and Qt5, each with different levels of complexity:
- https://github.com/smistad/Qt-OpenGL-OpenCL-Interoperability
- https://github.com/petoknm/QtOpenCLGLInterop
- http://www.krazer.com/?p=109
- https://github.com/smistad/Qt-OpenGL-OpenCL-Interoperability
- https://github.com/petoknm/QtOpenCLGLInterop
- http://www.krazer.com/?p=109
有这些示例很好，但是它们没有回答以下问题:最小的确切步骤是什么，才能使 Qt5 小部件程序显示以下结果:在 OpenCL内核中进行的计算，然后直接转移到由 Qt5 启动的附加的 OpenGL上下文中?
Having these examples is nice, however they don't answer the following question: What exact steps are the minimum required to have a Qt5 widgets program display the result of a calculation made in OpenCL kernel and then transferred directly to attached OpenGL context initiated by Qt5?
子问题包括:
- 将Qt5中的OpenGL上下文公开给OpenCL的正确方法是什么?
- 如何首先启动Qt5应用程序，以确保正确设置OpenGL上下文以与OpenCL配合使用?
- 应如何初始化OpenCL以使其与Qt5中的OpenGL上下文兼容?
- 要在Qt5支持的平台上运行该功能，我必须注意哪些怪癖?
- 是不是有一种官方"方式来做到这一点，还是Digia正在开发这种方式?
请注意，我主要对使用OpenGL作为窗口小部件(而不是窗口/全屏)感兴趣.
Note, I am primarily interested in using OpenGL as a widget as opposed to a window/full-screen.
推荐答案
我通过以下策略在Mac，Linux和Windows上一起使用了Qt5和OpenCL:
I have used Qt5 and OpenCL together on mac, linux and windows with the following strategy:
- 创建QGLWidget和GL上下文(此示例创建两个GL上下文，一个用于QGLwidget中的Qt/可视化，一个用于OpenCL，称为mainGLContext，在执行多线程时非常有用.这两个上下文将能够共享数据.)
QGLWidget* widget = new QGLWidget;
QGLContext* mainGLContext = new QGLContext(QGLFormat::defaultFormat(), widget);
mainGLContext->create();
- 使用OpenGL上下文创建OpenCL上下文.这是特定于平台的.对于Linux，您使用glx，对于Windows wgl和mac cgl共享组.下面是我用来创建上下文属性以实现互操作性的函数.在Linux和Windows上使用display变量，您可以通过glXGetCurrentDisplay()和wglGetCurrentDC()来获取它.
cl_context_properties* createInteropContextProperties(
const cl::Platform &platform,
cl_context_properties OpenGLContext,
cl_context_properties display) {
#if defined(__APPLE__) || defined(__MACOSX)
CGLSetCurrentContext((CGLContextObj)OpenGLContext);
CGLShareGroupObj shareGroup = CGLGetShareGroup((CGLContextObj)OpenGLContext);
if(shareGroup == NULL)
throw Exception("Not able to get sharegroup");
cl_context_properties * cps = new cl_context_properties[3];
cps[0] = CL_CONTEXT_PROPERTY_USE_CGL_SHAREGROUP_APPLE;
cps[1] = (cl_context_properties)shareGroup;
cps[2] = 0;
#else
#ifdef _WIN32
// Windows
cl_context_properties * cps = new cl_context_properties[7];
cps[0] = CL_GL_CONTEXT_KHR;
cps[1] = OpenGLContext;
cps[2] = CL_WGL_HDC_KHR;
cps[3] = display;
cps[4] = CL_CONTEXT_PLATFORM;
cps[5] = (cl_context_properties) (platform)();
cps[6] = 0;
#else
cl_context_properties * cps = new cl_context_properties[7];
cps[0] = CL_GL_CONTEXT_KHR;
cps[1] = OpenGLContext;
cps[2] = CL_GLX_DISPLAY_KHR;
cps[3] = display;
cps[4] = CL_CONTEXT_PLATFORM;
cps[5] = (cl_context_properties) (platform)();
cps[6] = 0;
#endif
#endif
return cps;
}
-
通常您想执行多线程处理，让一个线程执行Qt事件处理，而在另一个线程中执行一些OpenCL处理.请记住在每个线程中将GL上下文设为当前".为此，请在QGLContext对象上使用makeCurrent和moveToThread函数.您可以在此处找到有关如何执行此操作的详细信息: https ://github.com/smistad/FAST/blob/master/source/FAST/Visualization/Window.cpp
我不知道使用Qt OpenCL包装器来创建OpenCL上下文.
I don't know of a Qt OpenCL wrapper to create the OpenCL context.
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