Copy libGL force-inclusion hack from renderdoccmd to qrenderdoc

* Normally Qt uses libGL dynamically so this isn't an issue, but if Qt
  is statically linked then we need this.

qrenderdoc/CMakeLists.txt

@@ -20,6 +20,18 @@ if(QRENDERDOC_NO_CXX11_REGEX)
     set(QMAKE_CXXFLAGS "-DNO_CXX11_REGEX=1")
 endif()
 
+if(ENABLE_GL)
+    set(QMAKE_CXXFLAGS "${QMAKE_CXXFLAGS} -DRENDERDOC_SUPPORT_GL")
+endif()
+
+if(ENABLE_GLES)
+    set(QMAKE_CXXFLAGS "${QMAKE_CXXFLAGS} -DRENDERDOC_SUPPORT_GLES")
+endif()
+
+if(ENABLE_VULKAN)
+    set(QMAKE_CXXFLAGS "${QMAKE_CXXFLAGS} -DRENDERDOC_SUPPORT_VULKAN")
+endif()
+
 if(APPLE)
     add_custom_command(OUTPUT RenderDoc.icns
 	COMMAND echo Creating OS X Icon

qrenderdoc/Code/qrenderdoc.cpp

@@ -33,6 +33,52 @@
 #include "Code/Resources.h"
 #include "Windows/MainWindow.h"
 
+#if defined(Q_OS_LINUX)
+
+#if defined(RENDERDOC_SUPPORT_GL)
+
+// symbol defined in libGL but not librenderdoc.
+// Forces link of libGL after renderdoc (otherwise all symbols would
+// be resolved and libGL wouldn't link, meaning dlsym(RTLD_NEXT) would fai
+extern "C" void glXWaitX();
+
+#endif
+
+#if defined(RENDERDOC_SUPPORT_GLES)
+
+// symbol defined in libEGL but not in librenderdoc.
+// Forces link of libEGL.
+extern "C" int eglWaitGL(void);
+
+#endif
+
+void linuxlibGLhack()
+{
+  volatile bool never_run = false;
+
+#if defined(RENDERDOC_SUPPORT_GL)
+
+  if(never_run)
+    glXWaitX();
+
+#endif
+
+#if defined(RENDERDOC_SUPPORT_GLES)
+
+  if(never_run)
+    eglWaitGL();
+
+#endif
+}
+
+#else
+
+void linuxlibGLhack()
+{
+}
+
+#endif
+
 void sharedLogOutput(QtMsgType type, const QMessageLogContext &context, const QString &msg)
 {
   LogMessageType logtype = eLogType_Comment;
@@ -53,6 +99,8 @@ int main(int argc, char *argv[])
 {
   qInstallMessageHandler(sharedLogOutput);
 
+  linuxlibGLhack();
+
   qInfo() << "QRenderDoc initialising.";
 
   QString filename = "";

qrenderdoc/qrenderdoc.pro

@@ -96,6 +96,16 @@ win32 {
 	} else {
 		QT += x11extras
 		DEFINES += RENDERDOC_PLATFORM_POSIX RENDERDOC_PLATFORM_LINUX RENDERDOC_WINDOWING_XLIB RENDERDOC_WINDOWING_XCB
+
+		contains(QMAKE_CXXFLAGS, "-DRENDERDOC_SUPPORT_GL") {
+			# Link against GL
+			LIBS += -lGL
+		}
+
+		contains(QMAKE_CXXFLAGS, "-DRENDERDOC_SUPPORT_GLES") {
+			# Link against EGL
+			LIBS += -lEGL
+		}
 	}
 }