call clear buffers at right place

3rd_party/QGLViewer/QGLViewer/qglviewer.cpp

@@ -270,15 +270,6 @@ void QGLViewer::initializeGL() {
   setForegroundColor(QColor(180, 180, 180));
   setBackgroundColor(QColor(51, 51, 51));
 
-  // Clear the buffer where we're going to draw
-  if (format().stereo()) {
-    glDrawBuffer(GL_BACK_RIGHT);
-    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-    glDrawBuffer(GL_BACK_LEFT);
-    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-  } else
-    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-
   // Calls user defined method. Default emits a signal.
   init();
 
@@ -295,6 +286,15 @@ camera in the world coordinate system. \arg draw() (or fastDraw() when the
 camera is manipulated) : main drawing method. Should be overloaded. \arg
 postDraw() : display of visual hints (world axis, FPS...) */
 void QGLViewer::paintGL() {
+    // Clear the buffer where we're going to draw
+    if (format().stereo()) {
+        glDrawBuffer(GL_BACK_RIGHT);
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+        glDrawBuffer(GL_BACK_LEFT);
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    } else
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
   if (displaysInStereo()) {
     for (int view = 1; view >= 0; --view) {
       // Clears screen, set model view matrix with shifted matrix for ith buffer

3rd_party/SiftGPU/CMakeLists.txt

@@ -2,9 +2,18 @@ if(NOT IS_MSVC)
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC")
 endif()
 
-set (OpenGL_GL_PREFERENCE GLVND)
+# prefer GLVND
+set(OpenGL_GL_PREFERENCE GLVND)
 find_package(OpenGL REQUIRED)
-message(STATUS "OpenGL libraries: ${OPENGL_LIBRARIES}")
+if (OPENGL_opengl_LIBRARY)
+    set(FOUND_GL_LIBRARIES ${OPENGL_opengl_LIBRARY})
+else ()
+    set(FOUND_GL_LIBRARIES ${OPENGL_gl_LIBRARY})
+endif ()
+if (OPENGL_glx_LIBRARY)
+    list(APPEND FOUND_GL_LIBRARIES ${OPENGL_glx_LIBRARY})
+endif ()
+message(STATUS "OpenGL libraries: ${FOUND_GL_LIBRARIES}")
 
 add_definitions("-DSIFTGPU_NO_DEVIL")
 
@@ -52,7 +61,7 @@ endif()
 
 target_link_libraries(3rd_sift_gpu
     ${SIFT_GPU_LIBRARIES}
-    ${OPENGL_LIBRARIES}
+    ${FOUND_GL_LIBRARIES}
 )
 
 set(GLEW_INCLUDE_DIR ${MVSTUDIO_THIRD_PARTY}/glew/include)

3rd_party/SiftGPU/GlobalUtil.cpp

@@ -45,9 +45,6 @@ using std::cout;
 
 #endif
 
-#include "LiteWindow.h"
-
-#include "GL/glew.h"
 #include "GlobalUtil.h"
 
 #if defined(__APPLE__)
@@ -56,6 +53,7 @@ using std::cout;
 #include <GL/glu.h>
 #endif
 
+#include "LiteWindow.h"
 //
 int GlobalParam::_verbose = 1;
 int    GlobalParam::_timingS = 1;  //print out information of each step

MVStudio/main_window.cpp

@@ -228,7 +228,7 @@ void MainWindow::setBackgroundColor() {
 	if (color.isValid() && mainCanvas_) {
 		mainCanvas_->makeCurrent();
 		mainCanvas_->setBackgroundColor(color);
-
+        mainCanvas_->doneCurrent();
 		mainCanvas_->update_graphics();
 	}
 }

libs/algo/image_matching.cpp

@@ -7,6 +7,7 @@
 #include "../basic/progress.h"
 #include "../basic/logger.h"
 #include "../basic/stop_watch.h"
+#include "../opengl/opengl_info.h"
 
 //include the header files for SiftGPU and SiftMatchGPU
 #include "../../3rd_party/SiftGPU/SiftGPU.h"
@@ -43,14 +44,16 @@ void ImageMatching::apply() {
 
 	image_features.clear();
 	StopWatch w;
+    ogf_check_gl;
 	Logger::out(title()) << "extracting key points..." << std::endl;
 	extract_key_points();
 	Logger::out(title()) << "done. time: " << w.elapsed() << std::endl;
-
+    ogf_check_gl;
 	w.start();
 	Logger::out(title()) << "matching the images..." << std::endl;
 	match_key_points();
 	Logger::out(title()) << "done. time: " << w.elapsed() << std::endl;
+    ogf_check_gl;
 }
 
 
@@ -67,15 +70,17 @@ void ImageMatching::extract_key_points() {
 		return;
 	}
 
+    ogf_check_gl;
 	SiftGPU* sift = CreateNewSiftGPU();
+    ogf_check_gl;
 	//Create a context for computation, and SiftGPU will be initialized automatically 
 	//The same context can be used by SiftMatchGPU.
 	// Liangliang: I already have a OpenGL context. Just use it.
 	if (sift->CreateContextGL() == SiftGPU::SIFTGPU_NOT_SUPPORTED) {
 		Logger::err(title()) << "SiftGPU not supported" << std::endl;
         return;
 	}
-
+    ogf_check_gl;
 	char * argv[] = { "-fo", "-1", "-v", "0", "-tc2", "7680", "-b", "-nomc" };//
 	//-fo -1    staring from -1 octave 
 	//-v 1      only print out # feature and overall time
@@ -85,7 +90,7 @@ void ImageMatching::extract_key_points() {
 	int argc = sizeof(argv)/sizeof(char*);
 	sift->ParseParam(argc, argv);
 	//sift->SetMaxDimension(8000);
-
+    ogf_check_gl;
 	///////////////////////////////////////////////////////////////////////
 	//Only the following parameters can be changed after initialization (by calling ParseParam). 
 	//-dw, -ofix, -ofix-not, -fo, -unn, -maxd, -b
@@ -103,25 +108,25 @@ void ImageMatching::extract_key_points() {
 		}
 		if (project_->images[i].ignored)
 			continue;
-
+        ogf_check_gl;
 		//Create a context for computation, and SiftGPU will be initialized automatically 
 		//The same context can be used by SiftMatchGPU.
 		// Liangliang: I already have a OpenGL context. Just use it.
 		if (sift->CreateContextGL() == SiftGPU::SIFTGPU_NOT_SUPPORTED) {
 			Logger::err(title()) << "SiftGPU not supported" << std::endl;
 			break;
 		}
-
+        ogf_check_gl;
 		const std::string& name = project_->images[i].file;
 		if (!sift->RunSIFT(name.c_str())) {
 			Logger::warn(title()) << "processing image \'" << FileUtils::simple_name(name) << "\' failed" << std::endl;
 			project_->set_ignore_image(name, true);
 			continue;
 		}
-
+        ogf_check_gl;
 		std::string sift_file = project_->sfm_keys_dir + '/' + FileUtils::base_name(name) + ".key";
 		sift->SaveSIFT(sift_file.c_str());
-
+        ogf_check_gl;
 		int image_width, image_height;
 		sift->GetImageDimension(image_width, image_height);
 		float focal_length_in_pixels = 1.2f * std::max(image_width, image_height);
@@ -131,7 +136,7 @@ void ImageMatching::extract_key_points() {
 
 		int num = sift->GetFeatureNum();	// get feature count
 		Logger::out(title()) << FileUtils::simple_name(name) << ": " << num << " key points" << std::endl;
-
+        ogf_check_gl;
 		std::vector<SiftGPU::SiftKeypoint> keys;
 		std::vector<float> descriptors;
 
@@ -141,17 +146,20 @@ void ImageMatching::extract_key_points() {
 			//reading back feature vectors is faster than writing files
 			//if you don't need keys or descriptors, just put NULLs here
 			sift->GetFeatureVector(&keys[0], &descriptors[0]);
-			//this can be used to write your own sift file.  
+			//this can be used to write your own sift file.
+            ogf_check_gl;
 		}
 
 		ImageFeature feature;
+        ogf_check_gl;
 		feature.keys = keys;
 		feature.descriptors = descriptors;
 		image_features.push_back(feature);
-
+        ogf_check_gl;
 		progress.next();
 	}
 
+    ogf_check_gl;
 	delete sift;
 }
 
@@ -169,9 +177,9 @@ void ImageMatching::match_key_points() {
 		Logger::err(title()) << "could not write matches file \'" << match_table_file << "\'" << std::endl;
 		return;
 	}
-
+    ogf_check_gl;
 	SiftMatchGPU* matcher = new SiftMatchGPU;
-
+    ogf_check_gl;
 	//Before initialization, you can choose between GLSL, and CUDA(if compiled). 
 	//matcher->SetLanguage(SiftMatchGPU::SIFTMATCH_CUDA); // +i for the (i+1)-th device
 
@@ -189,14 +197,16 @@ void ImageMatching::match_key_points() {
 		int num1 = (int)keys1.size();
 		if (num1 == 0)
 			continue;
-
+
+        ogf_check_gl;
 		for ( int j = i+1; j < num; ++j) {
 			const std::vector<SiftGPU::SiftKeypoint>& keys2 = image_features[j].keys;
 			const std::vector<float>& descriptors2 = image_features[j].descriptors;
 			int num2 = (int)keys2.size();
 			if (num2 == 0)
 				continue;
 
+            ogf_check_gl;
 			if (progress.is_canceled()) {
 				delete matcher;
 				return;
@@ -209,18 +219,20 @@ void ImageMatching::match_key_points() {
 				Logger::err(title()) << "SiftGPU not supported" << std::endl;
 				break;
 			}
+            ogf_check_gl;
 
 			//Set descriptors to match, the first argument must be either 0 or 1
 			//if you want to use more than 4096 or less than 4096
 			//call matcher->SetMaxSift() to change the limit before calling setdescriptor
 			matcher->SetDescriptors(0, num1, &descriptors1[0]); //image 1
 			matcher->SetDescriptors(1, num2, &descriptors2[0]); //image 2
-
+            ogf_check_gl;
 			//match and get result.    
             int(*match_buf)[2] = new int[num1][2];
 			//use the default thresholds. Check the declaration in SiftGPU.h
 			int num_match = matcher->GetSiftMatch(num1, match_buf);
 			output << i << "   " << j << std::endl << num_match << std::endl;
+            ogf_check_gl;
 
 			//enumerate all the feature matches
 			for (int k = 0; k < num_match; ++k) {
@@ -241,11 +253,14 @@ void ImageMatching::match_key_points() {
 			output << std::endl;
 
 			delete[] match_buf;
+            ogf_check_gl;
 
 			progress.next();
 		}
 	}
 
 	image_features.clear();
+    ogf_check_gl;
 	delete matcher;
+    ogf_check_gl;
 }

libs/opengl/opengl_info.cpp

@@ -1,6 +1,6 @@
 #include "opengl_info.h"
 #include <iostream>
-
+#include "GL/glew.h"
 
 static const std::string err_msg = "error(null_string)";
 

libs/opengl/opengl_info.h

@@ -2,12 +2,8 @@
 #ifndef _OPENGL_GLINFORMATION_H_
 #define _OPENGL_GLINFORMATION_H_
 
-#include "GL/glew.h"
-
 #include <string>
 
-
-
 #ifndef NDEBUG
 #define ogf_check_gl {\
 	GLInfo::check_gl(__FILE__, __LINE__) ;\