1 files changed, 214 insertions, 0 deletions
diff --git a/src/frontend/duckstation/gl/context_agl.mm b/src/frontend/duckstation/gl/context_agl.mm
new file mode 100644
index 0000000..f833518
--- /dev/null
+++ b/src/frontend/duckstation/gl/context_agl.mm
@@ -0,0 +1,214 @@
+#include "context_agl.h"
+#include "../duckstation_compat.h"
+#include "../log.h"
+#include "loader.h"
+#include <dlfcn.h>
+Log_SetChannel(GL::ContextAGL);
+
+namespace GL {
+ContextAGL::ContextAGL(const WindowInfo& wi) : Context(wi)
+{
+  m_opengl_module_handle = dlopen("/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL", RTLD_NOW);
+  if (!m_opengl_module_handle)
+    Log_ErrorPrint("Could not open OpenGL.framework, function lookups will probably fail");
+}
+
+ContextAGL::~ContextAGL()
+{
+  if ([NSOpenGLContext currentContext] == m_context)
+    [NSOpenGLContext clearCurrentContext];
+
+  if (m_context)
+    [m_context release];
+
+  if (m_pixel_format)
+    [m_pixel_format release];
+
+  if (m_opengl_module_handle)
+    dlclose(m_opengl_module_handle);
+}
+
+std::unique_ptr<Context> ContextAGL::Create(const WindowInfo& wi, const Version* versions_to_try,
+                                            size_t num_versions_to_try)
+{
+  std::unique_ptr<ContextAGL> context = std::make_unique<ContextAGL>(wi);
+  if (!context->Initialize(versions_to_try, num_versions_to_try))
+    return nullptr;
+
+  return context;
+}
+
+bool ContextAGL::Initialize(const Version* versions_to_try, size_t num_versions_to_try)
+{
+  for (size_t i = 0; i < num_versions_to_try; i++)
+  {
+    const Version& cv = versions_to_try[i];
+    if (cv.profile == Profile::NoProfile && CreateContext(nullptr, NSOpenGLProfileVersionLegacy, true))
+    {
+      // we already have the dummy context, so just use that
+      m_version = cv;
+      return true;
+    }
+    else if (cv.profile == Profile::Core)
+    {
+      if (cv.major_version > 4 && cv.minor_version > 1)
+        continue;
+      
+      const NSOpenGLPixelFormatAttribute profile = (cv.major_version > 3 || cv.minor_version > 2) ? NSOpenGLProfileVersion4_1Core : NSOpenGLProfileVersion3_2Core;
+      if (CreateContext(nullptr, static_cast<int>(profile), true))
+      {        
+        m_version = cv;
+        return true;
+      }
+    }
+  }
+
+  return false;
+}
+
+void* ContextAGL::GetProcAddress(const char* name)
+{
+  void* addr = m_opengl_module_handle ? dlsym(m_opengl_module_handle, name) : nullptr;
+  if (addr)
+    return addr;
+
+  return dlsym(RTLD_NEXT, name);
+}
+
+bool ContextAGL::ChangeSurface(const WindowInfo& new_wi)
+{
+  m_wi = new_wi;
+  BindContextToView();
+  return true;
+}
+
+void ContextAGL::ResizeSurface(u32 new_surface_width /*= 0*/, u32 new_surface_height /*= 0*/)
+{
+  UpdateDimensions();
+}
+
+bool ContextAGL::UpdateDimensions()
+{
+  const NSSize window_size = [GetView() frame].size;
+  const CGFloat window_scale = [[GetView() window] backingScaleFactor];
+  const u32 new_width = static_cast<u32>(static_cast<CGFloat>(window_size.width) * window_scale);
+  const u32 new_height = static_cast<u32>(static_cast<CGFloat>(window_size.height) * window_scale);
+
+  if (m_wi.surface_width == new_width && m_wi.surface_height == new_height)
+    return false;
+
+  m_wi.surface_width = new_width;
+  m_wi.surface_height = new_height;
+
+  dispatch_block_t block = ^{
+    [m_context update];
+  };
+
+  if ([NSThread isMainThread])
+    block();
+  else
+    dispatch_sync(dispatch_get_main_queue(), block);
+
+  return true;
+}
+
+bool ContextAGL::SwapBuffers()
+{
+  [m_context flushBuffer];
+  return true;
+}
+
+bool ContextAGL::MakeCurrent()
+{
+  [m_context makeCurrentContext];
+  return true;
+}
+
+bool ContextAGL::DoneCurrent()
+{
+  [NSOpenGLContext clearCurrentContext];
+  return true;
+}
+
+bool ContextAGL::SetSwapInterval(s32 interval)
+{
+  GLint gl_interval = static_cast<GLint>(interval);
+  [m_context setValues:&gl_interval forParameter:NSOpenGLCPSwapInterval];
+  return true;
+}
+
+std::unique_ptr<Context> ContextAGL::CreateSharedContext(const WindowInfo& wi)
+{
+  std::unique_ptr<ContextAGL> context = std::make_unique<ContextAGL>(wi);
+
+  context->m_context = [[NSOpenGLContext alloc] initWithFormat:m_pixel_format shareContext:m_context];
+  if (context->m_context == nil)
+    return nullptr;
+
+  context->m_version = m_version;
+  context->m_pixel_format = m_pixel_format;
+  [context->m_pixel_format retain];
+
+  if (wi.type == WindowInfo::Type::MacOS)
+    context->BindContextToView();
+  
+  return context;
+}
+
+bool ContextAGL::CreateContext(NSOpenGLContext* share_context, int profile, bool make_current)
+{
+  if (m_context)
+  {
+    [m_context release];
+    m_context = nullptr;
+  }
+
+  if (m_pixel_format)
+    [m_pixel_format release];
+
+  const std::array<NSOpenGLPixelFormatAttribute, 5> attribs = {{
+      NSOpenGLPFADoubleBuffer,
+      NSOpenGLPFAOpenGLProfile,
+      static_cast<NSOpenGLPixelFormatAttribute>(profile),
+      NSOpenGLPFAAccelerated,
+      0}};
+  m_pixel_format = [[NSOpenGLPixelFormat alloc] initWithAttributes:attribs.data()];
+  if (m_pixel_format == nil)
+  {
+    Log_ErrorPrintf("Failed to initialize pixel format");
+    return false;
+  }
+
+  m_context = [[NSOpenGLContext alloc] initWithFormat:m_pixel_format shareContext:nil];
+  if (m_context == nil)
+    return false;
+
+  if (m_wi.type == WindowInfo::Type::MacOS)
+    BindContextToView();
+
+  if (make_current)
+    [m_context makeCurrentContext];
+
+  return true;
+}
+
+void ContextAGL::BindContextToView()
+{
+  NSView* const view = GetView();
+  NSWindow* const window = [view window];
+  [view setWantsBestResolutionOpenGLSurface:YES];
+
+  UpdateDimensions();
+
+  dispatch_block_t block = ^{
+    [window makeFirstResponder:view];
+    [m_context setView:view];
+    [window makeKeyAndOrderFront:nil];
+  };
+
+  if ([NSThread isMainThread])
+    block();
+  else
+    dispatch_sync(dispatch_get_main_queue(), block);
+}
+} // namespace GL