Take screen resolution directly from Mir

src/anbox/graphics/gl_renderer_server.cpp

@@ -18,6 +18,7 @@
 #include "anbox/logger.h"
 #include "anbox/graphics/gl_renderer_server.h"
 #include "anbox/graphics/mir_native_window_creator.h"
+#include "anbox/graphics/mir_display_connection.h"
 
 #include "OpenglRender/render_api.h"
 
@@ -71,10 +72,15 @@ void GLRendererServer::start() {
     socket_path_ = server_addr;
     DEBUG("socket path %s", socket_path_);
 
+    auto display = window_creator_->display();
+
     // Create the window we use for rendering the output we get from the
     // Android container. This will internally construct a Mir surface
     // and use the host EGL/GLES libraries for rendering.
-    showOpenGLSubwindow(0, 0, 0, 1080, 1920, 1080, 1920, 1.0f, 0);
+    const auto width = display->horizontal_resolution();
+    const auto height = display->vertical_resolution();
+    if (!showOpenGLSubwindow(0, 0, 0, width, height, width, height, 1.0f, 0))
+        BOOST_THROW_EXCEPTION(std::runtime_error("Failed to setup GL based window"));
 }
 
 std::string GLRendererServer::socket_path() const {

src/anbox/graphics/mir_native_window_creator.cpp

@@ -57,5 +57,10 @@ void MirNativeWindowCreator::destroy_window(EGLNativeWindowType win) {
 
     windows_.erase(iter);
 }
+
+std::shared_ptr<MirDisplayConnection> MirNativeWindowCreator::display() const {
+    return display_connection_;
+}
+
 } // namespace graphics
 } // namespace anbox

src/anbox/graphics/mir_native_window_creator.h

@@ -39,6 +39,8 @@ public:
     EGLNativeWindowType create_window(int x, int y, int width, int height) override;
     void destroy_window(EGLNativeWindowType win) override;
 
+    std::shared_ptr<MirDisplayConnection> display() const;
+
 private:
     std::shared_ptr<InputChannel> input_channel_;
     std::shared_ptr<MirDisplayConnection> display_connection_;