OpenGLHostDisplay: Support fullscreen mode enumeration (DRM only)

src/common/gl/context.cpp

@@ -67,6 +67,11 @@ Context::Context(const WindowInfo& wi) : m_wi(wi) {}
 
 Context::~Context() = default;
 
+std::vector<Context::FullscreenModeInfo> Context::EnumerateFullscreenModes()
+{
+  return {};
+}
+
 std::unique_ptr<GL::Context> Context::Create(const WindowInfo& wi, const Version* versions_to_try,
                                              size_t num_versions_to_try)
 {

src/common/gl/context.h

@@ -3,6 +3,7 @@
 #include "../window_info.h"
 #include <array>
 #include <memory>
+#include <vector>
 
 namespace GL {
 class Context
@@ -25,6 +26,13 @@ public:
     int minor_version;
   };
 
+  struct FullscreenModeInfo
+  {
+    u32 width;
+    u32 height;
+    float refresh_rate;
+  };
+
   ALWAYS_INLINE const WindowInfo& GetWindowInfo() const { return m_wi; }
   ALWAYS_INLINE bool IsGLES() const { return (m_version.profile == Profile::ES); }
   ALWAYS_INLINE u32 GetSurfaceWidth() const { return m_wi.surface_width; }
@@ -40,6 +48,8 @@ public:
   virtual bool SetSwapInterval(s32 interval) = 0;
   virtual std::unique_ptr<Context> CreateSharedContext(const WindowInfo& wi) = 0;
 
+  virtual std::vector<FullscreenModeInfo> EnumerateFullscreenModes();
+
   static std::unique_ptr<Context> Create(const WindowInfo& wi, const Version* versions_to_try,
                                          size_t num_versions_to_try);
 

src/common/gl/context_egl_gbm.cpp

@@ -206,6 +206,18 @@ bool ContextEGLGBM::SetSwapInterval(s32 interval)
   return true;
 }
 
+std::vector<Context::FullscreenModeInfo> ContextEGLGBM::EnumerateFullscreenModes()
+{
+  std::vector<Context::FullscreenModeInfo> modes;
+  modes.reserve(m_drm_display.GetModeCount());
+  for (u32 i = 0; i < m_drm_display.GetModeCount(); i++)
+  {
+    modes.push_back(FullscreenModeInfo{m_drm_display.GetModeWidth(i), m_drm_display.GetModeHeight(i),
+                                       m_drm_display.GetModeRefreshRate(i)});
+  }
+  return modes;
+}
+
 #ifdef CONTEXT_EGL_GBM_USE_PRESENT_THREAD
 
 void ContextEGLGBM::StartPresentThread()

src/common/gl/context_egl_gbm.h

@@ -26,6 +26,8 @@ public:
   bool SwapBuffers() override;
   bool SetSwapInterval(s32 interval) override;
 
+  std::vector<FullscreenModeInfo> EnumerateFullscreenModes() override;
+
 protected:
   bool SetDisplay() override;
   EGLNativeWindowType GetNativeWindow(EGLConfig config) override;

src/frontend-common/common_host_interface.cpp

@@ -2870,6 +2870,11 @@ bool CommonHostInterface::ParseFullscreenMode(const std::string_view& mode, u32*
   return false;
 }
 
+std::string CommonHostInterface::GetFullscreenModeString(u32 width, u32 height, float refresh_rate)
+{
+  return StringUtil::StdStringFromFormat("%u x %u @ %f hz", width, height, refresh_rate);
+}
+
 bool CommonHostInterface::RequestRenderWindowSize(s32 new_window_width, s32 new_window_height)
 {
   return false;

src/frontend-common/common_host_interface.h

@@ -241,6 +241,9 @@ public:
   /// Parses a fullscreen mode into its components (width * height @ refresh hz)
   static bool ParseFullscreenMode(const std::string_view& mode, u32* width, u32* height, float* refresh_rate);
 
+  /// Converts a fullscreen mode to a string.
+  static std::string GetFullscreenModeString(u32 width, u32 height, float refresh_rate);
+
   /// Returns true if fast forwarding or slow motion is currently active.
   bool IsRunningAtNonStandardSpeed() const;
 

src/frontend-common/d3d11_host_display.cpp

@@ -4,14 +4,15 @@
 #include "common/d3d11/shader_compiler.h"
 #include "common/log.h"
 #include "common/string_util.h"
+#include "common_host_interface.h"
 #include "core/host_interface.h"
 #include "core/settings.h"
 #include "core/shader_cache_version.h"
 #include "display_ps.hlsl.h"
 #include "display_vs.hlsl.h"
-#include "frontend-common/postprocessing_shadergen.h"
 #include "imgui.h"
 #include "imgui_impl_dx11.h"
+#include "postprocessing_shadergen.h"
 #include <array>
 #include <dxgi1_5.h>
 Log_SetChannel(D3D11HostDisplay);
@@ -843,8 +844,8 @@ HostDisplay::AdapterAndModeList D3D11HostDisplay::GetAdapterAndModeList(IDXGIFac
           {
             for (const DXGI_MODE_DESC& mode : modes)
             {
-              adapter_info.fullscreen_modes.push_back(StringUtil::StdStringFromFormat(
-                "%u x %u @ %f hz", mode.Width, mode.Height,
+              adapter_info.fullscreen_modes.push_back(CommonHostInterface::GetFullscreenModeString(
+                mode.Width, mode.Height,
                 static_cast<float>(mode.RefreshRate.Numerator) / static_cast<float>(mode.RefreshRate.Denominator)));
             }
           }

src/frontend-common/opengl_host_display.cpp

@@ -3,6 +3,7 @@
 #include "common/assert.h"
 #include "common/log.h"
 #include "common/string_util.h"
+#include "common_host_interface.h"
 #include "imgui.h"
 #include "imgui_impl_opengl3.h"
 #include "postprocessing_shadergen.h"
@@ -512,7 +513,18 @@ bool OpenGLHostDisplay::SetFullscreen(bool fullscreen, u32 width, u32 height, fl
 
 HostDisplay::AdapterAndModeList OpenGLHostDisplay::GetAdapterAndModeList()
 {
-  return {};
+  AdapterAndModeList aml;
+
+  if (m_gl_context)
+  {
+    for (const GL::Context::FullscreenModeInfo& fmi : m_gl_context->EnumerateFullscreenModes())
+    {
+      aml.fullscreen_modes.push_back(
+        CommonHostInterface::GetFullscreenModeString(fmi.width, fmi.height, fmi.refresh_rate));
+    }
+  }
+
+  return aml;
 }
 
 void OpenGLHostDisplay::DestroyRenderSurface()