bootmanager: Address review comments

Changes QMessageBox usages to warnings, as the problems they bring to
light are being safely handled by the application and do not warrant
something of the "critical" level.

Changes LOG_CRITICAL to LOG_ERROR for the same reason. Preferring ERROR
to WARNING as yuzu is denying loading of any guest applications after
checking for these conditions.

Moved logging the GL_RENDERER string into GetUnsupportedGLExtensions()
to make more clear that unsupported extensions were already being
logged. Makes placement of the logs easier to understand later, as well.

src/yuzu/bootmanager.cpp

@@ -604,28 +604,27 @@ bool GRenderWindow::LoadOpenGL() {
     auto context = CreateSharedContext();
     auto scope = context->Acquire();
     if (!gladLoadGL()) {
-        QMessageBox::critical(
+        QMessageBox::warning(
             this, tr("Error while initializing OpenGL!"),
             tr("Your GPU may not support OpenGL, or you do not have the latest graphics driver."));
         return false;
     }
 
-    QString renderer = QString::fromUtf8(reinterpret_cast<const char*>(glGetString(GL_RENDERER)));
+    const QString renderer =
+        QString::fromUtf8(reinterpret_cast<const char*>(glGetString(GL_RENDERER)));
 
     if (!GLAD_GL_VERSION_4_3) {
-        LOG_CRITICAL(Frontend, "GPU does not support OpenGL 4.3: {:s}", renderer.toStdString());
-        QMessageBox::critical(this, tr("Error while initializing OpenGL 4.3!"),
-                              tr("Your GPU may not support OpenGL 4.3, or you do not have the "
-                                 "latest graphics driver.<br><br>GL Renderer:<br>%1")
-                                  .arg(renderer));
+        LOG_ERROR(Frontend, "GPU does not support OpenGL 4.3: {}", renderer.toStdString());
+        QMessageBox::warning(this, tr("Error while initializing OpenGL 4.3!"),
+                             tr("Your GPU may not support OpenGL 4.3, or you do not have the "
+                                "latest graphics driver.<br><br>GL Renderer:<br>%1")
+                                 .arg(renderer));
         return false;
     }
 
     QStringList unsupported_gl_extensions = GetUnsupportedGLExtensions();
     if (!unsupported_gl_extensions.empty()) {
-        LOG_CRITICAL(Frontend, "GPU does not support all needed extensions: {:s}",
-                     renderer.toStdString());
-        QMessageBox::critical(
+        QMessageBox::warning(
             this, tr("Error while initializing OpenGL!"),
             tr("Your GPU may not support one or more required OpenGL extensions. Please ensure you "
                "have the latest graphics driver.<br><br>GL Renderer:<br>%1<br><br>Unsupported "
@@ -661,8 +660,13 @@ QStringList GRenderWindow::GetUnsupportedGLExtensions() const {
     if (!GLAD_GL_ARB_depth_buffer_float)
         unsupported_ext.append(QStringLiteral("ARB_depth_buffer_float"));
 
-    for (const QString& ext : unsupported_ext)
-        LOG_CRITICAL(Frontend, "Unsupported GL extension: {}", ext.toStdString());
+    if (!unsupported_ext.empty()) {
+        LOG_ERROR(Frontend, "GPU does not support all required extensions: {}",
+                  glGetString(GL_RENDERER));
+    }
+    for (const QString& ext : unsupported_ext) {
+        LOG_ERROR(Frontend, "Unsupported GL extension: {}", ext.toStdString());
+    }
 
     return unsupported_ext;
 }