From 8c587d2243884d85bbe5fadac64258ac246617b4 Mon Sep 17 00:00:00 2001
From: Ludovic Pouzenc <ludovic@pouzenc.fr>
Date: Sat, 2 Mar 2013 20:20:32 +0000
Subject: Version C++ qui arrive a initialiser OpenCL sans trop de merdouilles
 specifiques. Un dur labeur...
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Reste à retourner les pointeurs où il faut, faire la partie VBO, l'affichage du VBO et lancer un premier kernel


git-svn-id: file:///var/svn/2013-gpudataviz/trunk@16 371a6b4a-a258-45f8-9dcc-bdd82ce0ac9d
---
 src/boring_parts.cc | 188 +++++++++++++++++++++++++++-------------------------
 src/boring_parts.h  |   6 +-
 src/gpudataviz.cc   |  36 +++++++---
 3 files changed, 129 insertions(+), 101 deletions(-)

diff --git a/src/boring_parts.cc b/src/boring_parts.cc
index bc25f8f..27ead8b 100644
--- a/src/boring_parts.cc
+++ b/src/boring_parts.cc
@@ -1,7 +1,5 @@
 #include "boring_parts.h"
 
-
-
 // TODO : only need OpenGL things, not GTK ones for now
 //#include "gtk_includes.h"
 
@@ -20,22 +18,52 @@
 	} \
 } while(0)
 
-int initLibs() {
-
-#ifdef HAS_OPENCL
-	RETURN_IF_FAIL( initOpenCL() );
-#endif /*HAS_OPENCL*/
 
-	return 0;
-}
+/* From http://stackoverflow.com/questions/4317062/opengl-how-to-check-if-the-user-supports-glgenbuffers
+#ifndef STRINGIFY
+  #define STRINGIFY(x) #x
+#endif
+#ifdef WIN32
+  #include <windows.h>
+  #define glGetProcAddress(a) wglGetProcAddress(a)
+#endif
+#ifdef X11
+  #define glGetProcAddress(a) glXGetProcAddress ( \
+    reinterpret_cast<const unsigned char*>(a)     \
+  )
+#endif
+
+#ifndef GetExtension
+  #define GetExtension(Type, ExtenName)     \
+    ExtenName = (Type)                      \
+    glGetProcAddress(STRINGIFY(ExtenName)); \
+    if(!ExtenName)                          \
+    {                                       \
+      std:cout << "Your Computer Does Not " \
+               << "Support GL Extension: "  \
+               << STRINGIFY(ExtenName)      \
+               << std::endl;                \
+      exit(1);                              \
+    }                                       \
+    else                                    \
+    {                                       \
+      std::cout << "Loaded Extension: "     \
+                << STRINGIFY(ExtenName)     \
+                << std::endl;               \
+    }
+#endif
+*/
 
 #ifdef HAS_OPENCL
-int initOpenCL() {
+int initOpenCL(intptr_t gl_display, intptr_t gl_context, intptr_t gl_vbo) {
 	cl_uint id, numPlatforms, numDevices;
 	char pbuf[100];
 	std::string dTypeStr;
 	cl_platform_id *platforms, platform;
-	cl_device_id *devices, device;
+	cl_device_id /* *devices, */device;
+	cl_context cl_ctx;
+	cl_command_queue cl_commandQueue;
+	bool usableDeviceFound=false;
 
 	// Get platform count
 	CL_RETURN_VAL_IF_FAIL(1,
@@ -55,97 +83,77 @@ int initOpenCL() {
 
 	// Enumerate platforms and grab informations
 	for(id=0;id<numPlatforms;id++) {
+		cl_int res;
+		platform=platforms[id];
+
 		CL_RETURN_VAL_IF_FAIL(4,
-			clGetPlatformInfo(platforms[id], CL_PLATFORM_VENDOR, sizeof(pbuf), pbuf, NULL)
+			clGetPlatformInfo(platform, CL_PLATFORM_VENDOR, sizeof(pbuf), pbuf, NULL)
 		);
 		std::cout << "Platform " << id << " : " << pbuf << std::endl;
-	}
-
-	// Take the first one FIXME : do more !
-	platform = platforms[0];
-
-	// Get device count
-	CL_RETURN_VAL_IF_FAIL(11,
-		clGetDeviceIDs(platform,CL_DEVICE_TYPE_ALL,0,NULL,&numDevices)
-	);
-
-	std::cout << "\tDetected " << numDevices << " device(s) for platform " << platform << std::endl;
-	if ( ! ( numDevices > 0 ) ) return 12;
-
-	// Allocate room for all devices IDs
-	devices = new cl_device_id[numDevices];
-
-	// Get devices IDs
-	CL_RETURN_VAL_IF_FAIL(13,
-		clGetDeviceIDs(platform,CL_DEVICE_TYPE_ALL,numDevices,devices,&numDevices)
-	);
 
-	// Enumerate devices and grab informations
-	for(id=0;id<numDevices;id++) {
-		cl_device_type dType;
-
-		CL_RETURN_VAL_IF_FAIL(14,
-			clGetDeviceInfo(devices[id], CL_DEVICE_TYPE, sizeof(dType), &dType, NULL)
-		);
-
-		switch(dType) {
-			case CL_DEVICE_TYPE_GPU: dTypeStr="gpu"; break;
-			case CL_DEVICE_TYPE_CPU: dTypeStr="cpu"; break;
-			default: dTypeStr="(not supported)"; break;
+		// Dynamically get the function pointer for clGetGLConetextInfoKHR
+		clGetGLContextInfoKHR_fn clGetGLContextInfoKHR_proc = (clGetGLContextInfoKHR_fn) clGetExtensionFunctionAddressForPlatform(platform, "clGetGLContextInfoKHR");
+		if (!clGetGLContextInfoKHR_proc) {
+			std::cerr << "clGetExtensionFunctionAddressForPlatform(platform, clGetGLContextInfoKHR) failed" << std::endl;
+			continue;
 		}
-		std::cout << "\tDevice " << id << " type is " << dTypeStr << std::endl;
-	}
 
-	// Take the first one FIXME : do more !
-	device=devices[0];
-	std::cout << "\tWill use device 0 (" << device << ")" << std::endl;
-
-	delete [] devices;
-	delete [] platforms;
-
-/*
-	if (!clGetGLContextInfoKHR)
-	{
-		clGetGLContextInfoKHR = (clGetGLContextInfoKHR_fn) clGetExtensionFunctionAddressForPlatform(platform, "clGetGLContextInfoKHR");
-		if (!clGetGLContextInfoKHR)
-		{
-			std::cout << "Failed to query proc address for clGetGLContextInfoKHR";
+		// Try to get the device corresponding to the GL context/display on this platform
+		cl_context_properties cpsGL[] = {
+			CL_CONTEXT_PLATFORM, (cl_context_properties)platform,
+			CL_GLX_DISPLAY_KHR, gl_display,
+			CL_GL_CONTEXT_KHR, gl_context,
+			0
+		};
+
+		std::cout << "cl_context_properties :" << std::endl;
+		std::cout << "\tCL_CONTEXT_PLATFORM :" << (void *)cpsGL[1] << std::endl;
+		std::cout << "\tCL_GLX_DISPLAY_KHR :"  << (void *)cpsGL[3] << std::endl;
+		std::cout << "\tCL_GL_CONTEXT_KHR :"   << (void *)cpsGL[5] << std::endl;
+
+    size_t deviceSize=0;
+    // get deviceSize (should be 1*sizeof(cl_device_id) with CL_CURRENT_DEVICE_FOR_GL_CONTEXT_KHR)
+    res=clGetGLContextInfoKHR_proc(cpsGL,CL_CURRENT_DEVICE_FOR_GL_CONTEXT_KHR,0,NULL,&deviceSize);
+    if ( res!=CL_SUCCESS || deviceSize!=1*sizeof(cl_device_id)) {
+      std::cerr << "clGetGLContextInfoKHR_proc(cpsGL,CL_CURRENT_DEVICE_FOR_GL_CONTEXT_KHR,0,...) failed" << std::endl;
+			std::cerr << " (return code : " << res << ")" << std::endl;
+      continue;
+    }
+
+		device=0;
+		res=clGetGLContextInfoKHR_proc(cpsGL,CL_CURRENT_DEVICE_FOR_GL_CONTEXT_KHR,deviceSize,&device,NULL);
+		if ( res!=CL_SUCCESS || device==0 ) {
+			std::cerr << "clGetGLContextInfoKHR_proc(cpsGL,CL_CURRENT_DEVICE_FOR_GL_CONTEXT_KHR,...) failed" << std::endl;
+			std::cerr << " (return code : " << res << ")" << std::endl;
+			continue;
 		}
-	}
-
-    std::cout << "glXCreateContextAttribsARB "
-      << (void*) glXGetProcAddress((const GLubyte*)"glXCreateContextAttribsARB")
-      << std::endl;
 
-    GLXCREATECONTEXTATTRIBSARBPROC glXCreateContextAttribsARB = (GLXCREATECONTEXTATTRIBSARBPROC)
-      glXGetProcAddress((const GLubyte*)"glXCreateContextAttribsARB");
+		std::cout << "cl_device :" << (void *)device << std::endl;
 
-    int attribs[] = {
-      GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
-      GLX_CONTEXT_MINOR_VERSION_ARB, 0,
-      0
-    };
-
-    GLXContext ctx = glXCreateContextAttribsARB(displayName, *fbc, 0, true, attribs);
-*/
-
-
-/*
-	Ici, le contexte OpenGL du widget MyGTKGLSceneWidget est nécessaire.
+		cl_ctx = clCreateContext(cpsGL,1,&device,0,0,&res);
+		if ( res!=CL_SUCCESS ) {
+			std::cerr << "clCreateContext() failed" << std::endl; 
+			std::cerr << " (return code : " << res << ")" << std::endl;
+			continue;
+		}
 
-	http://developer.gnome.org/gtkglext/stable/gtkglext-gdkglcontext.html
-	glXMakeCurrent (displayName, win, ctx);
- */
+		cl_commandQueue = clCreateCommandQueue(cl_ctx,device,0,&res);
+		if ( res!=CL_SUCCESS ) {
+			std::cerr << "clCreateCommandQueue() failed" << std::endl; 
+			std::cerr << " (return code : " << res << ")" << std::endl;
+			continue;
+		}
 
-	GLXContext gGlCtx = glXGetCurrentContext();
-	std::cout << "gGlCtx == " << gGlCtx <<  std::endl;
-	cl_context_properties cpsGL[] = { CL_CONTEXT_PLATFORM, (cl_context_properties)platform,
-		CL_GLX_DISPLAY_KHR, (intptr_t) glXGetCurrentDisplay(),
-		CL_GL_CONTEXT_KHR, (intptr_t) gGlCtx, 0
-	};
+		usableDeviceFound=true;
+		break;
+	}
 
-	std::cout << "OpenCL initialization done." << std::endl;
-	return 0;
+	if (! usableDeviceFound) {
+		std::cerr << "No OpenCL device has been successfully initialized" << std::endl;
+		return 1;
+	}
+		std::cout << "OpenCL initialization done." << std::endl;
+		return 0;
 }
 #endif /*HAS_OPENCL*/
 
diff --git a/src/boring_parts.h b/src/boring_parts.h
index 54fd7b3..b4cd58d 100644
--- a/src/boring_parts.h
+++ b/src/boring_parts.h
@@ -2,18 +2,18 @@
 
 #include <gtkmm.h> /* Must included before X11/Xlib.h */
 //#include <GL/glew.h> /* Seems included by GL/glxew.h */
-#include <GL/glxew.h> /* For GLXContext, must appear before gl.h, includes X11/Xlib.h */
+//#include <GL/glxew.h> /* For GLXContext, must appear before gl.h, includes X11/Xlib.h */
 #include <gtkglmm.h> /* Includes a GL/gl.h (the right one ??) */
 
 //#include <GL/gl.h>
-//#include <GL/glu.h>
+#include <GL/glu.h>
 //#include <CL/cl_gl.h>
 
 int initLibs();
 
 #ifdef HAS_OPENCL
 #include <CL/opencl.h>
-int initOpenCL();
+int initOpenCL(intptr_t gl_display, intptr_t gl_context, intptr_t gl_vbo);
 #else
 // Quick and dirty cl_float4 replacement
 typedef union {
diff --git a/src/gpudataviz.cc b/src/gpudataviz.cc
index e6e4ca5..fbc1852 100644
--- a/src/gpudataviz.cc
+++ b/src/gpudataviz.cc
@@ -7,6 +7,8 @@
 #include "gtk_win_main.h"
 #include "my_gtk_gl_scene_widget.h"
 
+#include <gdk/x11/gdkglx.h> // X11 specific
+
 // Macro to make things readable in main() function
 #define EXIT_IF_FAIL(val, expr) do { \
 	if ( ! (expr) ) { \
@@ -39,18 +41,15 @@ int main(int argc, char* argv[]) {
 	Glib::RefPtr<Gdk::GL::Config> glconfig;
 	EXIT_IF_FAIL(2, glconfig=Gdk::GL::Config::create(glMode) );
 
-	// Initialize OpenCL (if available)
-	EXIT_IF_FAIL(3, initLibs()==0 ); // See boring_parts.cc
-
-	// Initialize host work memory (array for all the vertex coordinates computed by OpenCL and displayed by OpenGL)
-	cl_float4 *hostWorkMem = (cl_float4 *) calloc(meshWidth * meshHeight, sizeof(cl_float4));
-	EXIT_IF_FAIL(4, hostWorkMem);
-
 	// Initialize the OpenGL scene
 	MyGTKGLSceneWidget glScene(glconfig);
 
-	// Instantiate and run the GTK app
+	// Instantiate the GTK app
 	GTKWinMain gtkwinmain(glScene);
+
+	// Initialize OpenCL (only after the MyGTKGLSceneWidget realize)
+	//EXIT_IF_FAIL(3, initLibs()==0 ); // See boring_parts.cc
+
 	gtkKit.run(gtkwinmain);
 
 	return 0;
@@ -88,6 +87,27 @@ void MyGTKGLSceneWidget::on_realize() {
 		return;
 	}
 
+	// TODO : GL_ARB_vertex_buffer_object
+	intptr_t gl_vbo=0;
+
+#ifdef HAS_OPENCL
+	static bool isOpenCLInitialized=false;
+
+	if (! isOpenCLInitialized) {
+//	#ifdef X11
+		intptr_t gl_context = (intptr_t)glXGetCurrentContext();
+		intptr_t gl_display = (intptr_t)glXGetCurrentDisplay();
+
+		std::cerr << "DEBUG : begin initOpenCL()" << std::endl;
+		initOpenCL(gl_display, gl_context, gl_vbo); /* See boring_parts.cc */
+		isOpenCLInitialized=true;
+//	#else
+//		#error initOpenCL works only for X11 systems for now
+//	#endif
+	}
+#endif
+
+
 	// Programmatically create rendering lists : opengl will able to replay that efficiently
 	GLUquadricObj* qobj = gluNewQuadric();
 	gluQuadricDrawStyle(qobj, GLU_FILL);
-- 
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