early-access version 3625

src/core/frontend/emu_window.cpp

@@ -6,6 +6,8 @@
 
 namespace Core::Frontend {
 
+GraphicsContext::~GraphicsContext() = default;
+
 EmuWindow::EmuWindow() {
     // TODO: Find a better place to set this.
     config.min_client_area_size =

src/core/frontend/emu_window.h

@@ -5,14 +5,11 @@
 
 #include <memory>
 #include <utility>
-
 #include "common/common_types.h"
 #include "core/frontend/framebuffer_layout.h"
 
 namespace Core::Frontend {
 
-class GraphicsContext;
-
 /// Information for the Graphics Backends signifying what type of screen pointer is in
 /// WindowInformation
 enum class WindowSystemType {
@@ -24,6 +21,51 @@ enum class WindowSystemType {
     Android,
 };
 
+/**
+ * Represents a drawing context that supports graphics operations.
+ */
+class GraphicsContext {
+public:
+    virtual ~GraphicsContext();
+
+    /// Inform the driver to swap the front/back buffers and present the current image
+    virtual void SwapBuffers() {}
+
+    /// Makes the graphics context current for the caller thread
+    virtual void MakeCurrent() {}
+
+    /// Releases (dunno if this is the "right" word) the context from the caller thread
+    virtual void DoneCurrent() {}
+
+    class Scoped {
+    public:
+        [[nodiscard]] explicit Scoped(GraphicsContext& context_) : context(context_) {
+            context.MakeCurrent();
+        }
+        ~Scoped() {
+            if (active) {
+                context.DoneCurrent();
+            }
+        }
+
+        /// In the event that context was destroyed before the Scoped is destroyed, this provides a
+        /// mechanism to prevent calling a destroyed object's method during the deconstructor
+        void Cancel() {
+            active = false;
+        }
+
+    private:
+        GraphicsContext& context;
+        bool active{true};
+    };
+
+    /// Calls MakeCurrent on the context and calls DoneCurrent when the scope for the returned value
+    /// ends
+    [[nodiscard]] Scoped Acquire() {
+        return Scoped{*this};
+    }
+};
+
 /**
  * Abstraction class used to provide an interface between emulation code and the frontend
  * (e.g. SDL, QGLWidget, GLFW, etc...).