PyOpenCL June 2010

pyopencl@tiker.net

7 participants
12 discussions

[Andreas Kloeckner] Re: OpenGL Interoperability

by Andreas Kloeckner

Hi Paolo, On Tue, 15 Jun 2010 12:02:07 +0200, Paolo Simone Gasparello <djgaspa(a)gmail.= com> wrote: > Hi guys, anyone got OpenGL interoperability work? > With the following patch I'm able to create a context sharing OpenGL > buffers. Applied, thanks. (And I'm kind of embarrassed that you had to fix these two...) :) > Where fun_double is a kernel included in the file program.cl that simply > does each coord *=3D 2. >=20 > There are better ways to do this? I tryed to perform the cast to > c_void_p in C++ code using boost::python, but I was not able to make the > code work. I took a look, and it doesn't seem like ctypes has much in the way of C-accessible interface. One can of course emulate the Python code in C++, but I'm not sure that's necessary. If you'd like guidance on how to do that, let me know. Lastly, would you mind posting a fully functional example so that I can add it to the examples/ directory shipped with PyOpenCL? I think that could be rather helpful for people trying to follow in your footsteps. Thanks for your work! Andreas

10 years

OpenGL Interoperability

by Paolo Simone Gasparello

Hi guys, anyone got OpenGL interoperability work? With the following patch I'm able to create a context sharing OpenGL buffers. === begin patch === diff --git a/src/wrapper/wrap_cl.cpp b/src/wrapper/wrap_cl.cpp index 161bc16..f19d3b6 100644 --- a/src/wrapper/wrap_cl.cpp +++ b/src/wrapper/wrap_cl.cpp @@ -756,7 +756,7 @@ BOOST_PYTHON_MODULE(_cl) "GLBuffer", py::no_init) .def("__init__", make_constructor(create_from_gl_buffer, py::default_call_policies(), - (py::args("context", "flags" "bufobj")))) + (py::args("context", "flags", "bufobj")))) .def("get_gl_object_info", get_gl_object_info) ; } @@ -767,7 +767,7 @@ BOOST_PYTHON_MODULE(_cl) "GLRenderBuffer", py::no_init) .def("__init__", make_constructor(create_from_gl_renderbuffer, py::default_call_policies(), - (py::args("context", "flags" "bufobj")))) + (py::args("context", "flags", "bufobj")))) .def("get_gl_object_info", get_gl_object_info) ; } diff --git a/src/wrapper/wrap_cl.hpp b/src/wrapper/wrap_cl.hpp index c9fb1eb..5f12d70 100644 --- a/src/wrapper/wrap_cl.hpp +++ b/src/wrapper/wrap_cl.hpp @@ -637,20 +637,24 @@ namespace pyopencl py::extract<cl_context_properties>(prop_tuple[0]); props.push_back(prop); - if (prop == CL_CONTEXT_PLATFORM + if (prop == CL_CONTEXT_PLATFORM) + { + py::extract<const platform &> value(prop_tuple[1]); + props.push_back( + reinterpret_cast<cl_context_properties>(value().data())); + } #if defined(cl_khr_gl_sharing) && (cl_khr_gl_sharing >= 1) - || prop == CL_GL_CONTEXT_KHR + else if (prop == CL_GL_CONTEXT_KHR || prop == CL_EGL_DISPLAY_KHR || prop == CL_GLX_DISPLAY_KHR || prop == CL_WGL_HDC_KHR || prop == CL_CGL_SHAREGROUP_KHR + ) + { + py::extract<cl_context_properties> value(prop_tuple[1]); + props.push_back(value); + } #endif - ) - { - py::extract<const platform &> value(prop_tuple[1]); - props.push_back( - reinterpret_cast<cl_context_properties>(value().data())); - } else throw error("Context", CL_INVALID_VALUE, "invalid context property"); } === end patch === The python code I used in my example is this: from PyQt4.QtOpenGL import QGLWidget from OpenGL.GL import * import OpenGL.platform try: from OpenGL.WGL import wglGetCurrentDisplay as GetCurrentDisplay, wglGetCurrentContext as GetCurrentContext except: pass try: from OpenGL.GLX import glXGetCurrentDisplay as GetCurrentDisplay, glXGetCurrentContext as GetCurrentContext except: pass import pyopencl as cl import numpy class Viewer(QGLWidget): def __init__(self, parent=None): QGLWidget.__init__(self, parent) def initializeGL(self): with open('program.cl', 'r') as f: src = f.read() gl_ctx = ctypes.cast(GetCurrentContext(), ctypes.c_void_p).value display = ctypes.cast(GetCurrentDisplay(), ctypes.c_void_p).value p = cl.get_platforms() ctx_props = cl.context_properties props = [(ctx_props.PLATFORM, p[0]), (ctx_props.GL_CONTEXT_KHR, gl_ctx), (ctx_props.GLX_DISPLAY_KHR, display)] ctx = cl.Context(properties=props) glClearColor(1, 1, 1, 1) glColor(0, 1, 0) self.vbo = glGenBuffers(2) coords = numpy.array([[0, 0, 0], [1, 0, 0], [0.5, 1, 0]], dtype='float32') glBindBuffer(GL_ARRAY_BUFFER, self.vbo[0]) glBufferData(GL_ARRAY_BUFFER, coords, GL_STATIC_DRAW) glEnableClientState(GL_VERTEX_ARRAY) glVertexPointer(3, GL_FLOAT, 0, None) flags = cl.mem_flags.READ_WRITE vbo_id = self.vbo[0] coords_dev = cl.GLBuffer(ctx, flags, int(vbo_id)) prog = cl.Program(ctx, src).build() queue = cl.CommandQueue(ctx) cl.enqueue_acquire_gl_objects(queue, [coords_dev]) prog.fun_double(queue, (9,), coords_dev) cl.enqueue_release_gl_objects(queue, [coords_dev]) queue.finish() glFlush() Where fun_double is a kernel included in the file program.cl that simply does each coord *= 2. There are better ways to do this? I tryed to perform the cast to c_void_p in C++ code using boost::python, but I was not able to make the code work. -- Paolo Simone Gasparello <djgaspa(a)gmail.com>

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PyOpenCL June 2010