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;