Fix typo

third_party/duckstation/gl/context.cpp

@@ -0,0 +1,179 @@
+#include "context.h"
+#include "duckstation_log.h"
+#include "loader.h"
+#include <cstdlib>
+#include <cstring>
+#ifdef __APPLE__
+#include <stdlib.h>
+#else
+#include <malloc.h>
+#endif
+Log_SetChannel(GL::Context);
+
+#if defined(_WIN32)
+#include "context_wgl.h"
+#elif defined(__APPLE__)
+#include "context_agl.h"
+#else
+#ifdef WAYLAND_ENABLED
+#include "context_egl_wayland.h"
+#endif
+#include "context_egl_x11.h"
+#include "context_glx.h"
+#endif
+
+namespace GL {
+
+static bool ShouldPreferESContext()
+{
+#ifndef _MSC_VER
+  const char* value = std::getenv("PREFER_GLES_CONTEXT");
+  return (value && strcmp(value, "1") == 0);
+#else
+  char buffer[2] = {};
+  size_t buffer_size = sizeof(buffer);
+  getenv_s(&buffer_size, buffer, "PREFER_GLES_CONTEXT");
+  return (std::strcmp(buffer, "1") == 0);
+#endif
+}
+
+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)
+{
+  if (ShouldPreferESContext())
+  {
+    // move ES versions to the front
+    Version* new_versions_to_try = static_cast<Version*>(alloca(sizeof(Version) * num_versions_to_try));
+    size_t count = 0;
+    for (size_t i = 0; i < num_versions_to_try; i++)
+    {
+      if (versions_to_try[i].profile == Profile::ES)
+        new_versions_to_try[count++] = versions_to_try[i];
+    }
+    for (size_t i = 0; i < num_versions_to_try; i++)
+    {
+      if (versions_to_try[i].profile != Profile::ES)
+        new_versions_to_try[count++] = versions_to_try[i];
+    }
+    versions_to_try = new_versions_to_try;
+  }
+
+  std::unique_ptr<Context> context;
+#if defined(_WIN32)
+  context = ContextWGL::Create(wi, versions_to_try, num_versions_to_try);
+#elif defined(__APPLE__)
+  context = ContextAGL::Create(wi, versions_to_try, num_versions_to_try);
+#else
+  if (wi.type == WindowInfo::Type::X11)
+  {
+    const char* use_egl_x11 = std::getenv("USE_EGL_X11");
+    if (use_egl_x11 && std::strcmp(use_egl_x11, "1") == 0)
+      context = ContextEGLX11::Create(wi, versions_to_try, num_versions_to_try);
+    else
+      context = ContextGLX::Create(wi, versions_to_try, num_versions_to_try);
+  }
+
+#ifdef WAYLAND_ENABLED
+  if (wi.type == WindowInfo::Type::Wayland)
+    context = ContextEGLWayland::Create(wi, versions_to_try, num_versions_to_try);
+#endif
+#endif
+
+  if (!context)
+    return nullptr;
+
+  Log_InfoPrintf("Created a %s context", context->IsGLES() ? "OpenGL ES" : "OpenGL");
+
+  // TODO: Not thread-safe.
+  static Context* context_being_created;
+  context_being_created = context.get();
+
+  if (!gladLoadGLLoader([](const char* name) { return context_being_created->GetProcAddress(name); }))
+  {
+    Log_ErrorPrintf("Failed to load GL functions for GLAD");
+    return nullptr;
+  }
+
+  const char* gl_vendor = reinterpret_cast<const char*>(glGetString(GL_VENDOR));
+  const char* gl_renderer = reinterpret_cast<const char*>(glGetString(GL_RENDERER));
+  const char* gl_version = reinterpret_cast<const char*>(glGetString(GL_VERSION));
+  const char* gl_shading_language_version = reinterpret_cast<const char*>(glGetString(GL_SHADING_LANGUAGE_VERSION));
+  Log_InfoPrintf("GL_VENDOR: %s", gl_vendor);
+  Log_InfoPrintf("GL_RENDERER: %s", gl_renderer);
+  Log_InfoPrintf("GL_VERSION: %s", gl_version);
+  Log_InfoPrintf("GL_SHADING_LANGUAGE_VERSION: %s", gl_shading_language_version);
+
+  return context;
+}
+
+const std::array<Context::Version, 11>& Context::GetAllDesktopVersionsList()
+{
+  static constexpr std::array<Version, 11> vlist = {{{Profile::Core, 4, 6},
+                                                     {Profile::Core, 4, 5},
+                                                     {Profile::Core, 4, 4},
+                                                     {Profile::Core, 4, 3},
+                                                     {Profile::Core, 4, 2},
+                                                     {Profile::Core, 4, 1},
+                                                     {Profile::Core, 4, 0},
+                                                     {Profile::Core, 3, 3},
+                                                     {Profile::Core, 3, 2},
+                                                     {Profile::Core, 3, 1},
+                                                     {Profile::Core, 3, 0}}};
+  return vlist;
+}
+
+const std::array<Context::Version, 12>& Context::GetAllDesktopVersionsListWithFallback()
+{
+  static constexpr std::array<Version, 12> vlist = {{{Profile::Core, 4, 6},
+                                                     {Profile::Core, 4, 5},
+                                                     {Profile::Core, 4, 4},
+                                                     {Profile::Core, 4, 3},
+                                                     {Profile::Core, 4, 2},
+                                                     {Profile::Core, 4, 1},
+                                                     {Profile::Core, 4, 0},
+                                                     {Profile::Core, 3, 3},
+                                                     {Profile::Core, 3, 2},
+                                                     {Profile::Core, 3, 1},
+                                                     {Profile::Core, 3, 0},
+                                                     {Profile::NoProfile, 0, 0}}};
+  return vlist;
+}
+
+const std::array<Context::Version, 4>& Context::GetAllESVersionsList()
+{
+  static constexpr std::array<Version, 4> vlist = {
+    {{Profile::ES, 3, 2}, {Profile::ES, 3, 1}, {Profile::ES, 3, 0}, {Profile::ES, 2, 0}}};
+  return vlist;
+}
+
+const std::array<Context::Version, 16>& Context::GetAllVersionsList()
+{
+  static constexpr std::array<Version, 16> vlist = {{{Profile::Core, 4, 6},
+                                                     {Profile::Core, 4, 5},
+                                                     {Profile::Core, 4, 4},
+                                                     {Profile::Core, 4, 3},
+                                                     {Profile::Core, 4, 2},
+                                                     {Profile::Core, 4, 1},
+                                                     {Profile::Core, 4, 0},
+                                                     {Profile::Core, 3, 3},
+                                                     {Profile::Core, 3, 2},
+                                                     {Profile::Core, 3, 1},
+                                                     {Profile::Core, 3, 0},
+                                                     {Profile::ES, 3, 2},
+                                                     {Profile::ES, 3, 1},
+                                                     {Profile::ES, 3, 0},
+                                                     {Profile::ES, 2, 0},
+                                                     {Profile::NoProfile, 0, 0}}};
+  return vlist;
+}
+
+} // namespace GL

third_party/duckstation/gl/context.h

@@ -0,0 +1,76 @@
+#pragma once
+#include "duckstation_compat.h"
+#include "window_info.h"
+#include <array>
+#include <memory>
+#include <vector>
+
+namespace GL {
+class Context
+{
+public:
+  Context(const WindowInfo& wi);
+  virtual ~Context();
+
+  enum class Profile
+  {
+    NoProfile,
+    Core,
+    ES
+  };
+
+  struct Version
+  {
+    Profile profile;
+    int major_version;
+    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; }
+  ALWAYS_INLINE u32 GetSurfaceHeight() const { return m_wi.surface_height; }
+  ALWAYS_INLINE WindowInfo::SurfaceFormat GetSurfaceFormat() const { return m_wi.surface_format; }
+
+  virtual void* GetProcAddress(const char* name) = 0;
+  virtual bool ChangeSurface(const WindowInfo& new_wi) = 0;
+  virtual void ResizeSurface(u32 new_surface_width = 0, u32 new_surface_height = 0) = 0;
+  virtual bool SwapBuffers() = 0;
+  virtual bool MakeCurrent() = 0;
+  virtual bool DoneCurrent() = 0;
+  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);
+
+  template<size_t N>
+  static std::unique_ptr<Context> Create(const WindowInfo& wi, const std::array<Version, N>& versions_to_try)
+  {
+    return Create(wi, versions_to_try.data(), versions_to_try.size());
+  }
+
+  static std::unique_ptr<Context> Create(const WindowInfo& wi) { return Create(wi, GetAllVersionsList()); }
+
+  static const std::array<Version, 11>& GetAllDesktopVersionsList();
+  static const std::array<Version, 12>& GetAllDesktopVersionsListWithFallback();
+  static const std::array<Version, 4>& GetAllESVersionsList();
+  static const std::array<Version, 16>& GetAllVersionsList();
+
+protected:
+#ifdef _WIN32
+#endif
+
+  WindowInfo m_wi;
+  Version m_version = {};
+};
+} // namespace GL

third_party/duckstation/gl/context_agl.h

@@ -0,0 +1,49 @@
+#pragma once
+#include "context.h"
+#include "loader.h"
+
+#if defined(__APPLE__) && defined(__OBJC__)
+#import <AppKit/AppKit.h>
+#else
+struct NSOpenGLContext;
+struct NSOpenGLPixelFormat;
+struct NSView;
+#define __bridge
+#endif
+
+namespace GL {
+
+class ContextAGL final : public Context
+{
+public:
+  ContextAGL(const WindowInfo& wi);
+  ~ContextAGL() override;
+
+  static std::unique_ptr<Context> Create(const WindowInfo& wi, const Version* versions_to_try,
+                                         size_t num_versions_to_try);
+
+  void* GetProcAddress(const char* name) override;
+  bool ChangeSurface(const WindowInfo& new_wi) override;
+  void ResizeSurface(u32 new_surface_width = 0, u32 new_surface_height = 0) override;
+  bool SwapBuffers() override;
+  bool MakeCurrent() override;
+  bool DoneCurrent() override;
+  bool SetSwapInterval(s32 interval) override;
+  std::unique_ptr<Context> CreateSharedContext(const WindowInfo& wi) override;
+
+private:
+  ALWAYS_INLINE NSView* GetView() const { return static_cast<NSView*>((__bridge NSView*)m_wi.window_handle); }
+
+  bool Initialize(const Version* versions_to_try, size_t num_versions_to_try);
+  bool CreateContext(NSOpenGLContext* share_context, int profile, bool make_current);
+  void BindContextToView();
+
+  // returns true if dimensions have changed
+  bool UpdateDimensions();
+
+  NSOpenGLContext* m_context = nullptr;
+  NSOpenGLPixelFormat* m_pixel_format = nullptr;
+  void* m_opengl_module_handle = nullptr;
+};
+
+} // namespace GL

third_party/duckstation/gl/context_agl.mm

@@ -0,0 +1,214 @@
+#include "context_agl.h"
+#include "duckstation_compat.h"
+#include "duckstation_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

third_party/duckstation/gl/context_egl.cpp

@@ -0,0 +1,432 @@
+#include "context_egl.h"
+#include "duckstation_log.h"
+#include "duckstation_compat.h"
+#include <optional>
+#include <vector>
+#include <cstring>
+Log_SetChannel(GL::ContextEGL);
+
+namespace GL {
+ContextEGL::ContextEGL(const WindowInfo& wi) : Context(wi) {}
+
+ContextEGL::~ContextEGL()
+{
+  DestroySurface();
+  DestroyContext();
+}
+
+std::unique_ptr<Context> ContextEGL::Create(const WindowInfo& wi, const Version* versions_to_try,
+                                            size_t num_versions_to_try)
+{
+  std::unique_ptr<ContextEGL> context = std::make_unique<ContextEGL>(wi);
+  if (!context->Initialize(versions_to_try, num_versions_to_try))
+    return nullptr;
+
+  return context;
+}
+
+bool ContextEGL::Initialize(const Version* versions_to_try, size_t num_versions_to_try)
+{
+  if (!gladLoadEGL())
+  {
+    Log_ErrorPrintf("Loading GLAD EGL functions failed");
+    return false;
+  }
+
+  if (!SetDisplay())
+    return false;
+
+  int egl_major, egl_minor;
+  if (!eglInitialize(m_display, &egl_major, &egl_minor))
+  {
+    Log_ErrorPrintf("eglInitialize() failed: %d", eglGetError());
+    return false;
+  }
+  Log_InfoPrintf("EGL Version: %d.%d", egl_major, egl_minor);
+
+  const char* extensions = eglQueryString(m_display, EGL_EXTENSIONS);
+  if (extensions)
+  {
+    Log_InfoPrintf("EGL Extensions: %s", extensions);
+    m_supports_surfaceless = std::strstr(extensions, "EGL_KHR_surfaceless_context") != nullptr;
+  }
+  if (!m_supports_surfaceless)
+    Log_WarningPrint("EGL implementation does not support surfaceless contexts, emulating with pbuffers");
+
+  for (size_t i = 0; i < num_versions_to_try; i++)
+  {
+    if (CreateContextAndSurface(versions_to_try[i], nullptr, true))
+      return true;
+  }
+
+  return false;
+}
+
+bool ContextEGL::SetDisplay()
+{
+  m_display = eglGetDisplay(static_cast<EGLNativeDisplayType>(m_wi.display_connection));
+  if (!m_display)
+  {
+    Log_ErrorPrintf("eglGetDisplay() failed: %d", eglGetError());
+    return false;
+  }
+
+  return true;
+}
+
+void* ContextEGL::GetProcAddress(const char* name)
+{
+  return reinterpret_cast<void*>(eglGetProcAddress(name));
+}
+
+bool ContextEGL::ChangeSurface(const WindowInfo& new_wi)
+{
+  const bool was_current = (eglGetCurrentContext() == m_context);
+  if (was_current)
+    eglMakeCurrent(m_display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+
+  if (m_surface != EGL_NO_SURFACE)
+  {
+    eglDestroySurface(m_display, m_surface);
+    m_surface = EGL_NO_SURFACE;
+  }
+
+  m_wi = new_wi;
+  if (!CreateSurface())
+    return false;
+
+  if (was_current && !eglMakeCurrent(m_display, m_surface, m_surface, m_context))
+  {
+    Log_ErrorPrintf("Failed to make context current again after surface change");
+    return false;
+  }
+
+  return true;
+}
+
+void ContextEGL::ResizeSurface(u32 new_surface_width /*= 0*/, u32 new_surface_height /*= 0*/)
+{
+  if (new_surface_width == 0 && new_surface_height == 0)
+  {
+    EGLint surface_width, surface_height;
+    if (eglQuerySurface(m_display, m_surface, EGL_WIDTH, &surface_width) &&
+        eglQuerySurface(m_display, m_surface, EGL_HEIGHT, &surface_height))
+    {
+      m_wi.surface_width = static_cast<u32>(surface_width);
+      m_wi.surface_height = static_cast<u32>(surface_height);
+      return;
+    }
+    else
+    {
+      Log_ErrorPrintf("eglQuerySurface() failed: %d", eglGetError());
+    }
+  }
+
+  m_wi.surface_width = new_surface_width;
+  m_wi.surface_height = new_surface_height;
+}
+
+bool ContextEGL::SwapBuffers()
+{
+  return eglSwapBuffers(m_display, m_surface);
+}
+
+bool ContextEGL::MakeCurrent()
+{
+  if (!eglMakeCurrent(m_display, m_surface, m_surface, m_context))
+  {
+    Log_ErrorPrintf("eglMakeCurrent() failed: %d", eglGetError());
+    return false;
+  }
+
+  return true;
+}
+
+bool ContextEGL::DoneCurrent()
+{
+  return eglMakeCurrent(m_display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+}
+
+bool ContextEGL::SetSwapInterval(s32 interval)
+{
+  return eglSwapInterval(m_display, interval);
+}
+
+std::unique_ptr<Context> ContextEGL::CreateSharedContext(const WindowInfo& wi)
+{
+  std::unique_ptr<ContextEGL> context = std::make_unique<ContextEGL>(wi);
+  context->m_display = m_display;
+  context->m_supports_surfaceless = m_supports_surfaceless;
+
+  if (!context->CreateContextAndSurface(m_version, m_context, false))
+    return nullptr;
+
+  return context;
+}
+
+EGLNativeWindowType ContextEGL::GetNativeWindow(EGLConfig config)
+{
+  return {};
+}
+
+bool ContextEGL::CreateSurface()
+{
+  if (m_wi.type == WindowInfo::Type::Surfaceless)
+  {
+    if (m_supports_surfaceless)
+      return true;
+    else
+      return CreatePBufferSurface();
+  }
+
+  EGLNativeWindowType native_window = GetNativeWindow(m_config);
+  m_surface = eglCreateWindowSurface(m_display, m_config, native_window, nullptr);
+  if (!m_surface)
+  {
+    Log_ErrorPrintf("eglCreateWindowSurface() failed: %d", eglGetError());
+    return false;
+  }
+
+  // Some implementations may require the size to be queried at runtime.
+  EGLint surface_width, surface_height;
+  if (eglQuerySurface(m_display, m_surface, EGL_WIDTH, &surface_width) &&
+      eglQuerySurface(m_display, m_surface, EGL_HEIGHT, &surface_height))
+  {
+    m_wi.surface_width = static_cast<u32>(surface_width);
+    m_wi.surface_height = static_cast<u32>(surface_height);
+  }
+  else
+  {
+    Log_ErrorPrintf("eglQuerySurface() failed: %d", eglGetError());
+  }
+
+  return true;
+}
+
+bool ContextEGL::CreatePBufferSurface()
+{
+  const u32 width = std::max<u32>(m_wi.surface_width, 1);
+  const u32 height = std::max<u32>(m_wi.surface_height, 1);
+
+  // TODO: Format
+  EGLint attrib_list[] = {
+    EGL_WIDTH, static_cast<EGLint>(width), EGL_HEIGHT, static_cast<EGLint>(height), EGL_NONE,
+  };
+
+  m_surface = eglCreatePbufferSurface(m_display, m_config, attrib_list);
+  if (!m_surface)
+  {
+    Log_ErrorPrintf("eglCreatePbufferSurface() failed: %d", eglGetError());
+    return false;
+  }
+
+  Log_DevPrintf("Created %ux%u pbuffer surface", width, height);
+  return true;
+}
+
+bool ContextEGL::CheckConfigSurfaceFormat(EGLConfig config, WindowInfo::SurfaceFormat format) const
+{
+  int red_size, green_size, blue_size, alpha_size;
+  if (!eglGetConfigAttrib(m_display, config, EGL_RED_SIZE, &red_size) ||
+      !eglGetConfigAttrib(m_display, config, EGL_GREEN_SIZE, &green_size) ||
+      !eglGetConfigAttrib(m_display, config, EGL_BLUE_SIZE, &blue_size) ||
+      !eglGetConfigAttrib(m_display, config, EGL_ALPHA_SIZE, &alpha_size))
+  {
+    return false;
+  }
+
+  switch (format)
+  {
+    case WindowInfo::SurfaceFormat::Auto:
+      return true;
+
+    case WindowInfo::SurfaceFormat::RGB8:
+      return (red_size == 8 && green_size == 8 && blue_size == 8);
+
+    case WindowInfo::SurfaceFormat::RGBA8:
+      return (red_size == 8 && green_size == 8 && blue_size == 8 && alpha_size == 8);
+
+    case WindowInfo::SurfaceFormat::RGB565:
+      return (red_size == 5 && green_size == 6 && blue_size == 5);
+
+    default:
+      return false;
+  }
+}
+
+void ContextEGL::DestroyContext()
+{
+  if (eglGetCurrentContext() == m_context)
+    eglMakeCurrent(m_display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+
+  if (m_context != EGL_NO_CONTEXT)
+  {
+    eglDestroyContext(m_display, m_context);
+    m_context = EGL_NO_CONTEXT;
+  }
+}
+
+void ContextEGL::DestroySurface()
+{
+  if (eglGetCurrentSurface(EGL_DRAW) == m_surface)
+    eglMakeCurrent(m_display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+
+  if (m_surface != EGL_NO_SURFACE)
+  {
+    eglDestroySurface(m_display, m_surface);
+    m_surface = EGL_NO_SURFACE;
+  }
+}
+
+bool ContextEGL::CreateContext(const Version& version, EGLContext share_context)
+{
+  Log_DevPrintf(
+    "Trying version %u.%u (%s)", version.major_version, version.minor_version,
+    version.profile == Context::Profile::ES ? "ES" : (version.profile == Context::Profile::Core ? "Core" : "None"));
+  int surface_attribs[16] = {
+    EGL_RENDERABLE_TYPE,
+    (version.profile == Profile::ES) ?
+      ((version.major_version >= 3) ? EGL_OPENGL_ES3_BIT :
+                                      ((version.major_version == 2) ? EGL_OPENGL_ES2_BIT : EGL_OPENGL_ES_BIT)) :
+      EGL_OPENGL_BIT,
+    EGL_SURFACE_TYPE,
+    (m_wi.type != WindowInfo::Type::Surfaceless) ? EGL_WINDOW_BIT : 0,
+  };
+  int nsurface_attribs = 4;
+
+  switch (m_wi.surface_format)
+  {
+    case WindowInfo::SurfaceFormat::RGB8:
+      surface_attribs[nsurface_attribs++] = EGL_RED_SIZE;
+      surface_attribs[nsurface_attribs++] = 8;
+      surface_attribs[nsurface_attribs++] = EGL_GREEN_SIZE;
+      surface_attribs[nsurface_attribs++] = 8;
+      surface_attribs[nsurface_attribs++] = EGL_BLUE_SIZE;
+      surface_attribs[nsurface_attribs++] = 8;
+      break;
+
+    case WindowInfo::SurfaceFormat::RGBA8:
+      surface_attribs[nsurface_attribs++] = EGL_RED_SIZE;
+      surface_attribs[nsurface_attribs++] = 8;
+      surface_attribs[nsurface_attribs++] = EGL_GREEN_SIZE;
+      surface_attribs[nsurface_attribs++] = 8;
+      surface_attribs[nsurface_attribs++] = EGL_BLUE_SIZE;
+      surface_attribs[nsurface_attribs++] = 8;
+      surface_attribs[nsurface_attribs++] = EGL_ALPHA_SIZE;
+      surface_attribs[nsurface_attribs++] = 8;
+      break;
+
+    case WindowInfo::SurfaceFormat::RGB565:
+      surface_attribs[nsurface_attribs++] = EGL_RED_SIZE;
+      surface_attribs[nsurface_attribs++] = 5;
+      surface_attribs[nsurface_attribs++] = EGL_GREEN_SIZE;
+      surface_attribs[nsurface_attribs++] = 6;
+      surface_attribs[nsurface_attribs++] = EGL_BLUE_SIZE;
+      surface_attribs[nsurface_attribs++] = 5;
+      break;
+
+    case WindowInfo::SurfaceFormat::Auto:
+      break;
+
+    default:
+      UnreachableCode();
+      break;
+  }
+
+  surface_attribs[nsurface_attribs++] = EGL_NONE;
+  surface_attribs[nsurface_attribs++] = 0;
+
+  EGLint num_configs;
+  if (!eglChooseConfig(m_display, surface_attribs, nullptr, 0, &num_configs) || num_configs == 0)
+  {
+    Log_ErrorPrintf("eglChooseConfig() failed: %d", eglGetError());
+    return false;
+  }
+
+  std::vector<EGLConfig> configs(static_cast<u32>(num_configs));
+  if (!eglChooseConfig(m_display, surface_attribs, configs.data(), num_configs, &num_configs))
+  {
+    Log_ErrorPrintf("eglChooseConfig() failed: %d", eglGetError());
+    return false;
+  }
+  configs.resize(static_cast<u32>(num_configs));
+
+  std::optional<EGLConfig> config;
+  for (EGLConfig check_config : configs)
+  {
+    if (CheckConfigSurfaceFormat(check_config, m_wi.surface_format))
+    {
+      config = check_config;
+      break;
+    }
+  }
+
+  if (!config.has_value())
+  {
+    Log_WarningPrintf("No EGL configs matched exactly, using first.");
+    config = configs.front();
+  }
+
+  int attribs[8];
+  int nattribs = 0;
+  if (version.profile != Profile::NoProfile)
+  {
+    attribs[nattribs++] = EGL_CONTEXT_MAJOR_VERSION;
+    attribs[nattribs++] = version.major_version;
+    attribs[nattribs++] = EGL_CONTEXT_MINOR_VERSION;
+    attribs[nattribs++] = version.minor_version;
+  }
+  attribs[nattribs++] = EGL_NONE;
+  attribs[nattribs++] = 0;
+
+  if (!eglBindAPI((version.profile == Profile::ES) ? EGL_OPENGL_ES_API : EGL_OPENGL_API))
+  {
+    Log_ErrorPrintf("eglBindAPI(%s) failed", (version.profile == Profile::ES) ? "EGL_OPENGL_ES_API" : "EGL_OPENGL_API");
+    return false;
+  }
+
+  m_context = eglCreateContext(m_display, config.value(), share_context, attribs);
+  if (!m_context)
+  {
+    Log_ErrorPrintf("eglCreateContext() failed: %d", eglGetError());
+    return false;
+  }
+
+  Log_InfoPrintf(
+    "Got version %u.%u (%s)", version.major_version, version.minor_version,
+    version.profile == Context::Profile::ES ? "ES" : (version.profile == Context::Profile::Core ? "Core" : "None"));
+
+  m_config = config.value();
+  m_version = version;
+  return true;
+}
+
+bool ContextEGL::CreateContextAndSurface(const Version& version, EGLContext share_context, bool make_current)
+{
+  if (!CreateContext(version, share_context))
+    return false;
+
+  if (!CreateSurface())
+  {
+    Log_ErrorPrintf("Failed to create surface for context");
+    eglDestroyContext(m_display, m_context);
+    m_context = EGL_NO_CONTEXT;
+    return false;
+  }
+
+  if (make_current && !eglMakeCurrent(m_display, m_surface, m_surface, m_context))
+  {
+    Log_ErrorPrintf("eglMakeCurrent() failed: %d", eglGetError());
+    if (m_surface != EGL_NO_SURFACE)
+    {
+      eglDestroySurface(m_display, m_surface);
+      m_surface = EGL_NO_SURFACE;
+    }
+    eglDestroyContext(m_display, m_context);
+    m_context = EGL_NO_CONTEXT;
+    return false;
+  }
+
+  return true;
+}
+} // namespace GL

third_party/duckstation/gl/context_egl.h

@@ -0,0 +1,48 @@
+#pragma once
+#include "context.h"
+#include <glad/gl.h>
+
+namespace GL {
+
+class ContextEGL : public Context
+{
+public:
+  ContextEGL(const WindowInfo& wi);
+  ~ContextEGL() override;
+
+  static std::unique_ptr<Context> Create(const WindowInfo& wi, const Version* versions_to_try,
+                                         size_t num_versions_to_try);
+
+  void* GetProcAddress(const char* name) override;
+  virtual bool ChangeSurface(const WindowInfo& new_wi) override;
+  virtual void ResizeSurface(u32 new_surface_width = 0, u32 new_surface_height = 0) override;
+  bool SwapBuffers() override;
+  bool MakeCurrent() override;
+  bool DoneCurrent() override;
+  bool SetSwapInterval(s32 interval) override;
+  virtual std::unique_ptr<Context> CreateSharedContext(const WindowInfo& wi) override;
+
+protected:
+  virtual bool SetDisplay();
+  virtual EGLNativeWindowType GetNativeWindow(EGLConfig config);
+
+  bool Initialize(const Version* versions_to_try, size_t num_versions_to_try);
+  bool CreateDisplay();
+  bool CreateContext(const Version& version, EGLContext share_context);
+  bool CreateContextAndSurface(const Version& version, EGLContext share_context, bool make_current);
+  bool CreateSurface();
+  bool CreatePBufferSurface();
+  bool CheckConfigSurfaceFormat(EGLConfig config, WindowInfo::SurfaceFormat format) const;
+  void DestroyContext();
+  void DestroySurface();
+
+  EGLDisplay m_display = EGL_NO_DISPLAY;
+  EGLSurface m_surface = EGL_NO_SURFACE;
+  EGLContext m_context = EGL_NO_CONTEXT;
+
+  EGLConfig m_config = {};
+
+  bool m_supports_surfaceless = false;
+};
+
+} // namespace GL

third_party/duckstation/gl/context_egl_wayland.cpp

@@ -0,0 +1,86 @@
+#include "context_egl_wayland.h"
+#include "duckstation_log.h"
+#include <dlfcn.h>
+Log_SetChannel(ContextEGLWayland);
+
+namespace GL {
+static const char* WAYLAND_EGL_MODNAME = "libwayland-egl.so.1";
+
+ContextEGLWayland::ContextEGLWayland(const WindowInfo& wi) : ContextEGL(wi) {}
+ContextEGLWayland::~ContextEGLWayland()
+{
+  if (m_wl_window)
+    m_wl_egl_window_destroy(m_wl_window);
+  if (m_wl_module)
+    dlclose(m_wl_module);
+}
+
+std::unique_ptr<Context> ContextEGLWayland::Create(const WindowInfo& wi, const Version* versions_to_try,
+                                                   size_t num_versions_to_try)
+{
+  std::unique_ptr<ContextEGLWayland> context = std::make_unique<ContextEGLWayland>(wi);
+  if (!context->LoadModule() || !context->Initialize(versions_to_try, num_versions_to_try))
+    return nullptr;
+
+  return context;
+}
+
+std::unique_ptr<Context> ContextEGLWayland::CreateSharedContext(const WindowInfo& wi)
+{
+  std::unique_ptr<ContextEGLWayland> context = std::make_unique<ContextEGLWayland>(wi);
+  context->m_display = m_display;
+
+  if (!context->LoadModule() || !context->CreateContextAndSurface(m_version, m_context, false))
+    return nullptr;
+
+  return context;
+}
+
+void ContextEGLWayland::ResizeSurface(u32 new_surface_width, u32 new_surface_height)
+{
+  if (m_wl_window)
+    m_wl_egl_window_resize(m_wl_window, new_surface_width, new_surface_height, 0, 0);
+
+  ContextEGL::ResizeSurface(new_surface_width, new_surface_height);
+}
+
+EGLNativeWindowType ContextEGLWayland::GetNativeWindow(EGLConfig config)
+{
+  if (m_wl_window)
+  {
+    m_wl_egl_window_destroy(m_wl_window);
+    m_wl_window = nullptr;
+  }
+
+  m_wl_window =
+    m_wl_egl_window_create(static_cast<wl_surface*>(m_wi.window_handle), m_wi.surface_width, m_wi.surface_height);
+  if (!m_wl_window)
+    return {};
+
+  return reinterpret_cast<EGLNativeWindowType>(m_wl_window);
+}
+
+bool ContextEGLWayland::LoadModule()
+{
+  m_wl_module = dlopen(WAYLAND_EGL_MODNAME, RTLD_NOW | RTLD_GLOBAL);
+  if (!m_wl_module)
+  {
+    Log_ErrorPrintf("Failed to load %s.", WAYLAND_EGL_MODNAME);
+    return false;
+  }
+
+  m_wl_egl_window_create =
+    reinterpret_cast<decltype(m_wl_egl_window_create)>(dlsym(m_wl_module, "wl_egl_window_create"));
+  m_wl_egl_window_destroy =
+    reinterpret_cast<decltype(m_wl_egl_window_destroy)>(dlsym(m_wl_module, "wl_egl_window_destroy"));
+  m_wl_egl_window_resize =
+    reinterpret_cast<decltype(m_wl_egl_window_resize)>(dlsym(m_wl_module, "wl_egl_window_resize"));
+  if (!m_wl_egl_window_create || !m_wl_egl_window_destroy || !m_wl_egl_window_resize)
+  {
+    Log_ErrorPrintf("Failed to load one or more functions from %s.", WAYLAND_EGL_MODNAME);
+    return false;
+  }
+
+  return true;
+}
+} // namespace GL

third_party/duckstation/gl/context_egl_wayland.h

@@ -0,0 +1,33 @@
+#pragma once
+#include "context_egl.h"
+#include <wayland-egl.h>
+
+namespace GL {
+
+class ContextEGLWayland final : public ContextEGL
+{
+public:
+  ContextEGLWayland(const WindowInfo& wi);
+  ~ContextEGLWayland() override;
+
+  static std::unique_ptr<Context> Create(const WindowInfo& wi, const Version* versions_to_try,
+                                         size_t num_versions_to_try);
+
+  std::unique_ptr<Context> CreateSharedContext(const WindowInfo& wi) override;
+  void ResizeSurface(u32 new_surface_width = 0, u32 new_surface_height = 0) override;
+
+protected:
+  EGLNativeWindowType GetNativeWindow(EGLConfig config) override;
+
+private:
+  bool LoadModule();
+
+  wl_egl_window* m_wl_window = nullptr;
+
+  void* m_wl_module = nullptr;
+  wl_egl_window* (*m_wl_egl_window_create)(struct wl_surface* surface, int width, int height);
+  void (*m_wl_egl_window_destroy)(struct wl_egl_window* egl_window);
+  void (*m_wl_egl_window_resize)(struct wl_egl_window* egl_window, int width, int height, int dx, int dy);
+};
+
+} // namespace GL

third_party/duckstation/gl/context_egl_x11.cpp

@@ -0,0 +1,69 @@
+#include "context_egl_x11.h"
+#include "duckstation_log.h"
+Log_SetChannel(GL::ContextEGLX11);
+
+namespace GL {
+ContextEGLX11::ContextEGLX11(const WindowInfo& wi) : ContextEGL(wi) {}
+ContextEGLX11::~ContextEGLX11() = default;
+
+std::unique_ptr<Context> ContextEGLX11::Create(const WindowInfo& wi, const Version* versions_to_try,
+                                               size_t num_versions_to_try)
+{
+  std::unique_ptr<ContextEGLX11> context = std::make_unique<ContextEGLX11>(wi);
+  if (!context->Initialize(versions_to_try, num_versions_to_try))
+    return nullptr;
+
+  return context;
+}
+
+std::unique_ptr<Context> ContextEGLX11::CreateSharedContext(const WindowInfo& wi)
+{
+  std::unique_ptr<ContextEGLX11> context = std::make_unique<ContextEGLX11>(wi);
+  context->m_display = m_display;
+
+  if (!context->CreateContextAndSurface(m_version, m_context, false))
+    return nullptr;
+
+  return context;
+}
+
+void ContextEGLX11::ResizeSurface(u32 new_surface_width, u32 new_surface_height)
+{
+  m_window.Resize();
+  ContextEGL::ResizeSurface(new_surface_width, new_surface_height);
+}
+
+EGLNativeWindowType ContextEGLX11::GetNativeWindow(EGLConfig config)
+{
+  X11InhibitErrors ei;
+
+  EGLint native_visual_id = 0;
+  if (!eglGetConfigAttrib(m_display, m_config, EGL_NATIVE_VISUAL_ID, &native_visual_id))
+  {
+    Log_ErrorPrintf("Failed to get X11 visual ID");
+    return false;
+  }
+
+  XVisualInfo vi_query = {};
+  vi_query.visualid = native_visual_id;
+
+  int num_vis;
+  XVisualInfo* vi = XGetVisualInfo(static_cast<Display*>(m_wi.display_connection), VisualIDMask, &vi_query, &num_vis);
+  if (num_vis <= 0 || !vi)
+  {
+    Log_ErrorPrintf("Failed to query visual from X11");
+    return false;
+  }
+
+  m_window.Destroy();
+  if (!m_window.Create(GetDisplay(), static_cast<Window>(reinterpret_cast<uintptr_t>(m_wi.window_handle)), vi))
+  {
+    Log_ErrorPrintf("Faild to create X11 child window");
+    XFree(vi);
+    return false;
+  }
+
+  XFree(vi);
+  return static_cast<EGLNativeWindowType>(m_window.GetWindow());
+}
+} // namespace GL

third_party/duckstation/gl/context_egl_x11.h

@@ -0,0 +1,28 @@
+#pragma once
+#include "context_egl.h"
+#include "x11_window.h"
+
+namespace GL {
+
+class ContextEGLX11 final : public ContextEGL
+{
+public:
+  ContextEGLX11(const WindowInfo& wi);
+  ~ContextEGLX11() override;
+
+  static std::unique_ptr<Context> Create(const WindowInfo& wi, const Version* versions_to_try,
+                                         size_t num_versions_to_try);
+
+  std::unique_ptr<Context> CreateSharedContext(const WindowInfo& wi) override;
+  void ResizeSurface(u32 new_surface_width = 0, u32 new_surface_height = 0) override;
+
+protected:
+  EGLNativeWindowType GetNativeWindow(EGLConfig config) override;
+
+private:
+  ALWAYS_INLINE Display* GetDisplay() const { return static_cast<Display*>(m_wi.display_connection); }
+
+  X11Window m_window;
+};
+
+} // namespace GL

third_party/duckstation/gl/context_glx.cpp

@@ -0,0 +1,328 @@
+#include "context_glx.h"
+#include "duckstation_compat.h"
+#include "duckstation_log.h"
+#include <dlfcn.h>
+Log_SetChannel(GL::ContextGLX);
+
+namespace GL {
+ContextGLX::ContextGLX(const WindowInfo& wi) : Context(wi) {}
+
+ContextGLX::~ContextGLX()
+{
+  if (glXGetCurrentContext() == m_context)
+    glXMakeCurrent(GetDisplay(), None, nullptr);
+
+  if (m_context)
+    glXDestroyContext(GetDisplay(), m_context);
+
+  if (m_vi)
+    XFree(m_vi);
+
+  if (m_libGL_handle)
+    dlclose(m_libGL_handle);
+}
+
+std::unique_ptr<Context> ContextGLX::Create(const WindowInfo& wi, const Version* versions_to_try,
+                                            size_t num_versions_to_try)
+{
+  std::unique_ptr<ContextGLX> context = std::make_unique<ContextGLX>(wi);
+  if (!context->Initialize(versions_to_try, num_versions_to_try))
+    return nullptr;
+
+  return context;
+}
+
+bool ContextGLX::Initialize(const Version* versions_to_try, size_t num_versions_to_try)
+{
+  // We need libGL loaded, because GLAD loads its own, then releases it.
+  m_libGL_handle = dlopen("libGL.so.1", RTLD_NOW | RTLD_GLOBAL);
+  if (!m_libGL_handle)
+  {
+    m_libGL_handle = dlopen("libGL.so", RTLD_NOW | RTLD_GLOBAL);
+    if (!m_libGL_handle)
+    {
+      Log_ErrorPrintf("Failed to load libGL.so: %s", dlerror());
+      return false;
+    }
+  }
+
+  const int screen = DefaultScreen(GetDisplay());
+  if (!gladLoadGLX(GetDisplay(), screen))
+  {
+    Log_ErrorPrintf("Loading GLAD GLX functions failed");
+    return false;
+  }
+
+  if (m_wi.type == WindowInfo::Type::X11)
+  {
+    if (!CreateWindow(screen))
+      return false;
+  }
+  else
+  {
+    Panic("Create pbuffer");
+  }
+
+  for (size_t i = 0; i < num_versions_to_try; i++)
+  {
+    const Version& cv = versions_to_try[i];
+    if (cv.profile == Profile::NoProfile && CreateAnyContext(nullptr, true))
+    {
+      m_version = cv;
+      return true;
+    }
+    else if (cv.profile != Profile::NoProfile && CreateVersionContext(cv, nullptr, true))
+    {
+      m_version = cv;
+      return true;
+    }
+  }
+
+  return false;
+}
+
+void* ContextGLX::GetProcAddress(const char* name)
+{
+  return reinterpret_cast<void*>(glXGetProcAddress(reinterpret_cast<const GLubyte*>(name)));
+}
+
+bool ContextGLX::ChangeSurface(const WindowInfo& new_wi)
+{
+  const bool was_current = (glXGetCurrentContext() == m_context);
+  if (was_current)
+    glXMakeCurrent(GetDisplay(), None, nullptr);
+
+  m_window.Destroy();
+  m_wi = new_wi;
+
+  if (new_wi.type == WindowInfo::Type::X11)
+  {
+    const int screen = DefaultScreen(GetDisplay());
+    if (!CreateWindow(screen))
+      return false;
+  }
+
+  if (was_current && !glXMakeCurrent(GetDisplay(), GetDrawable(), m_context))
+  {
+    Log_ErrorPrintf("Failed to make context current again after surface change");
+    return false;
+  }
+
+  return true;
+}
+
+void ContextGLX::ResizeSurface(u32 new_surface_width /*= 0*/, u32 new_surface_height /*= 0*/)
+{
+  m_window.Resize(new_surface_width, new_surface_height);
+  m_wi.surface_width = m_window.GetWidth();
+  m_wi.surface_height = m_window.GetHeight();
+}
+
+bool ContextGLX::SwapBuffers()
+{
+  glXSwapBuffers(GetDisplay(), GetDrawable());
+  return true;
+}
+
+bool ContextGLX::MakeCurrent()
+{
+  return (glXMakeCurrent(GetDisplay(), GetDrawable(), m_context) == True);
+}
+
+bool ContextGLX::DoneCurrent()
+{
+  return (glXMakeCurrent(GetDisplay(), None, nullptr) == True);
+}
+
+bool ContextGLX::SetSwapInterval(s32 interval)
+{
+  if (GLAD_GLX_EXT_swap_control)
+  {
+    glXSwapIntervalEXT(GetDisplay(), GetDrawable(), interval);
+    return true;
+  }
+  else if (GLAD_GLX_MESA_swap_control)
+  {
+    return (glXSwapIntervalMESA(static_cast<u32>(std::max(interval, 0))) != 0);
+  }
+  else if (GLAD_GLX_SGI_swap_control)
+  {
+    return (glXSwapIntervalSGI(interval) != 0);
+  }
+  else
+  {
+    return false;
+  }
+}
+
+std::unique_ptr<Context> ContextGLX::CreateSharedContext(const WindowInfo& wi)
+{
+  std::unique_ptr<ContextGLX> context = std::make_unique<ContextGLX>(wi);
+  if (wi.type == WindowInfo::Type::X11)
+  {
+    const int screen = DefaultScreen(context->GetDisplay());
+    if (!context->CreateWindow(screen))
+      return nullptr;
+  }
+  else
+  {
+    Panic("Create pbuffer");
+  }
+
+  if (m_version.profile == Profile::NoProfile)
+  {
+    if (!context->CreateAnyContext(m_context, false))
+      return nullptr;
+  }
+  else
+  {
+    if (!context->CreateVersionContext(m_version, m_context, false))
+      return nullptr;
+  }
+
+  context->m_version = m_version;
+  return context;
+}
+
+bool ContextGLX::CreateWindow(int screen)
+{
+  int attribs[32] = {GLX_X_RENDERABLE,  True,           GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
+                     GLX_X_VISUAL_TYPE, GLX_TRUE_COLOR, GLX_DOUBLEBUFFER,  True};
+  int nattribs = 8;
+
+  switch (m_wi.surface_format)
+  {
+    case WindowInfo::SurfaceFormat::RGB8:
+      attribs[nattribs++] = GLX_RED_SIZE;
+      attribs[nattribs++] = 8;
+      attribs[nattribs++] = GLX_GREEN_SIZE;
+      attribs[nattribs++] = 8;
+      attribs[nattribs++] = GLX_BLUE_SIZE;
+      attribs[nattribs++] = 8;
+      break;
+
+    case WindowInfo::SurfaceFormat::RGBA8:
+      attribs[nattribs++] = GLX_RED_SIZE;
+      attribs[nattribs++] = 8;
+      attribs[nattribs++] = GLX_GREEN_SIZE;
+      attribs[nattribs++] = 8;
+      attribs[nattribs++] = GLX_BLUE_SIZE;
+      attribs[nattribs++] = 8;
+      attribs[nattribs++] = GLX_ALPHA_SIZE;
+      attribs[nattribs++] = 8;
+      break;
+
+    case WindowInfo::SurfaceFormat::RGB565:
+      attribs[nattribs++] = GLX_RED_SIZE;
+      attribs[nattribs++] = 5;
+      attribs[nattribs++] = GLX_GREEN_SIZE;
+      attribs[nattribs++] = 6;
+      attribs[nattribs++] = GLX_BLUE_SIZE;
+      attribs[nattribs++] = 5;
+      break;
+
+    case WindowInfo::SurfaceFormat::Auto:
+      break;
+
+    default:
+      UnreachableCode();
+      break;
+  }
+
+  attribs[nattribs++] = None;
+  attribs[nattribs++] = 0;
+
+  int fbcount = 0;
+  GLXFBConfig* fbc = glXChooseFBConfig(GetDisplay(), screen, attribs, &fbcount);
+  if (!fbc || !fbcount)
+  {
+    Log_ErrorPrintf("glXChooseFBConfig() failed");
+    return false;
+  }
+  m_fb_config = *fbc;
+  XFree(fbc);
+
+  if (!GLAD_GLX_VERSION_1_3)
+  {
+    Log_ErrorPrintf("GLX Version 1.3 is required");
+    return false;
+  }
+
+  m_vi = glXGetVisualFromFBConfig(GetDisplay(), m_fb_config);
+  if (!m_vi)
+  {
+    Log_ErrorPrintf("glXGetVisualFromFBConfig() failed");
+    return false;
+  }
+
+  return m_window.Create(GetDisplay(), static_cast<Window>(reinterpret_cast<uintptr_t>(m_wi.window_handle)), m_vi);
+}
+
+bool ContextGLX::CreateAnyContext(GLXContext share_context, bool make_current)
+{
+  X11InhibitErrors ie;
+
+  m_context = glXCreateContext(GetDisplay(), m_vi, share_context, True);
+  if (!m_context || ie.HadError())
+  {
+    Log_ErrorPrintf("glxCreateContext() failed");
+    return false;
+  }
+
+  if (make_current)
+  {
+    if (!glXMakeCurrent(GetDisplay(), GetDrawable(), m_context))
+    {
+      Log_ErrorPrintf("glXMakeCurrent() failed");
+      return false;
+    }
+  }
+
+  return true;
+}
+
+bool ContextGLX::CreateVersionContext(const Version& version, GLXContext share_context, bool make_current)
+{
+  // we need create context attribs
+  if (!GLAD_GLX_VERSION_1_3)
+  {
+    Log_ErrorPrint("Missing GLX version 1.3.");
+    return false;
+  }
+
+  int attribs[32];
+  int nattribs = 0;
+  attribs[nattribs++] = GLX_CONTEXT_PROFILE_MASK_ARB;
+  attribs[nattribs++] =
+    ((version.profile == Profile::ES) ?
+       ((version.major_version >= 2) ? GLX_CONTEXT_ES2_PROFILE_BIT_EXT : GLX_CONTEXT_ES_PROFILE_BIT_EXT) :
+       GLX_CONTEXT_CORE_PROFILE_BIT_ARB);
+  attribs[nattribs++] = GLX_CONTEXT_MAJOR_VERSION_ARB;
+  attribs[nattribs++] = version.major_version;
+  attribs[nattribs++] = GLX_CONTEXT_MINOR_VERSION_ARB;
+  attribs[nattribs++] = version.minor_version;
+  attribs[nattribs++] = None;
+  attribs[nattribs++] = 0;
+
+  X11InhibitErrors ie;
+  m_context = glXCreateContextAttribsARB(GetDisplay(), m_fb_config, share_context, True, attribs);
+  XSync(GetDisplay(), False);
+  if (ie.HadError())
+    m_context = nullptr;
+  if (!m_context)
+    return false;
+
+  if (make_current)
+  {
+    if (!glXMakeCurrent(GetDisplay(), GetDrawable(), m_context))
+    {
+      Log_ErrorPrint("glXMakeCurrent() failed");
+      glXDestroyContext(GetDisplay(), m_context);
+      m_context = nullptr;
+      return false;
+    }
+  }
+
+  return true;
+}
+} // namespace GL

third_party/duckstation/gl/context_glx.h

@@ -0,0 +1,44 @@
+#pragma once
+#include "context.h"
+#include "../../glad/glad_glx.h"
+#include "x11_window.h"
+
+namespace GL {
+
+class ContextGLX final : public Context
+{
+public:
+  ContextGLX(const WindowInfo& wi);
+  ~ContextGLX() override;
+
+  static std::unique_ptr<Context> Create(const WindowInfo& wi, const Version* versions_to_try,
+                                         size_t num_versions_to_try);
+
+  void* GetProcAddress(const char* name) override;
+  bool ChangeSurface(const WindowInfo& new_wi) override;
+  void ResizeSurface(u32 new_surface_width = 0, u32 new_surface_height = 0) override;
+  bool SwapBuffers() override;
+  bool MakeCurrent() override;
+  bool DoneCurrent() override;
+  bool SetSwapInterval(s32 interval) override;
+  std::unique_ptr<Context> CreateSharedContext(const WindowInfo& wi) override;
+
+private:
+  ALWAYS_INLINE Display* GetDisplay() const { return static_cast<Display*>(m_wi.display_connection); }
+  ALWAYS_INLINE GLXDrawable GetDrawable() const { return static_cast<GLXDrawable>(m_window.GetWindow()); }
+
+  bool Initialize(const Version* versions_to_try, size_t num_versions_to_try);
+  bool CreateWindow(int screen);
+  bool CreateAnyContext(GLXContext share_context, bool make_current);
+  bool CreateVersionContext(const Version& version, GLXContext share_context, bool make_current);
+
+  GLXContext m_context = nullptr;
+  GLXFBConfig m_fb_config = {};
+  XVisualInfo* m_vi = nullptr;
+  X11Window m_window;
+
+  // GLAD releases its reference to libGL.so, so we need to maintain our own.
+  void* m_libGL_handle = nullptr;
+};
+
+} // namespace GL

third_party/duckstation/gl/context_wgl.cpp

@@ -0,0 +1,452 @@
+#include "context_wgl.h"
+#include "duckstation_compat.h"
+#include "duckstation_log.h"
+#include "duckstation_scoped_guard.h"
+#include "loader.h"
+Log_SetChannel(GL::ContextWGL);
+
+// TODO: get rid of this
+#pragma comment(lib, "opengl32.lib")
+
+static void* GetProcAddressCallback(const char* name)
+{
+  void* addr = reinterpret_cast<void*>(wglGetProcAddress(name));
+  if (addr)
+    return addr;
+
+  // try opengl32.dll
+  return reinterpret_cast<void*>(::GetProcAddress(GetModuleHandleA("opengl32.dll"), name));
+}
+
+namespace GL {
+ContextWGL::ContextWGL(const WindowInfo& wi) : Context(wi) {}
+
+ContextWGL::~ContextWGL()
+{
+  if (wglGetCurrentContext() == m_rc)
+    wglMakeCurrent(m_dc, nullptr);
+
+  if (m_rc)
+    wglDeleteContext(m_rc);
+
+  ReleaseDC();
+}
+
+std::unique_ptr<Context> ContextWGL::Create(const WindowInfo& wi, const Version* versions_to_try,
+                                            size_t num_versions_to_try)
+{
+  std::unique_ptr<ContextWGL> context = std::make_unique<ContextWGL>(wi);
+  if (!context->Initialize(versions_to_try, num_versions_to_try))
+    return nullptr;
+
+  return context;
+}
+
+bool ContextWGL::Initialize(const Version* versions_to_try, size_t num_versions_to_try)
+{
+  if (m_wi.type == WindowInfo::Type::Win32)
+  {
+    if (!InitializeDC())
+      return false;
+  }
+  else
+  {
+    Log_ErrorPrint("ContextWGL must always start with a valid surface.");
+    return false;
+  }
+
+  // Everything including core/ES requires a dummy profile to load the WGL extensions.
+  if (!CreateAnyContext(nullptr, true))
+    return false;
+
+  for (size_t i = 0; i < num_versions_to_try; i++)
+  {
+    const Version& cv = versions_to_try[i];
+    if (cv.profile == Profile::NoProfile)
+    {
+      // we already have the dummy context, so just use that
+      m_version = cv;
+      return true;
+    }
+    else if (CreateVersionContext(cv, nullptr, true))
+    {
+      m_version = cv;
+      return true;
+    }
+  }
+
+  return false;
+}
+
+void* ContextWGL::GetProcAddress(const char* name)
+{
+  return GetProcAddressCallback(name);
+}
+
+bool ContextWGL::ChangeSurface(const WindowInfo& new_wi)
+{
+  const bool was_current = (wglGetCurrentContext() == m_rc);
+
+  ReleaseDC();
+
+  m_wi = new_wi;
+  if (!InitializeDC())
+    return false;
+
+  if (was_current && !wglMakeCurrent(m_dc, m_rc))
+  {
+    Log_ErrorPrintf("Failed to make context current again after surface change: 0x%08X", GetLastError());
+    return false;
+  }
+
+  return true;
+}
+
+void ContextWGL::ResizeSurface(u32 new_surface_width /*= 0*/, u32 new_surface_height /*= 0*/)
+{
+  RECT client_rc = {};
+  GetClientRect(GetHWND(), &client_rc);
+  m_wi.surface_width = static_cast<u32>(client_rc.right - client_rc.left);
+  m_wi.surface_height = static_cast<u32>(client_rc.bottom - client_rc.top);
+}
+
+bool ContextWGL::SwapBuffers()
+{
+  return ::SwapBuffers(m_dc);
+}
+
+bool ContextWGL::MakeCurrent()
+{
+  if (!wglMakeCurrent(m_dc, m_rc))
+  {
+    Log_ErrorPrintf("wglMakeCurrent() failed: 0x%08X", GetLastError());
+    return false;
+  }
+
+  return true;
+}
+
+bool ContextWGL::DoneCurrent()
+{
+  return wglMakeCurrent(m_dc, nullptr);
+}
+
+bool ContextWGL::SetSwapInterval(s32 interval)
+{
+  if (!GLAD_WGL_EXT_swap_control)
+    return false;
+
+  return wglSwapIntervalEXT(interval);
+}
+
+std::unique_ptr<Context> ContextWGL::CreateSharedContext(const WindowInfo& wi)
+{
+  std::unique_ptr<ContextWGL> context = std::make_unique<ContextWGL>(wi);
+  if (wi.type == WindowInfo::Type::Win32)
+  {
+    if (!context->InitializeDC())
+      return nullptr;
+  }
+  else
+  {
+    Log_ErrorPrint("PBuffer not implemented");
+    return nullptr;
+  }
+
+  if (m_version.profile == Profile::NoProfile)
+  {
+    if (!context->CreateAnyContext(m_rc, false))
+      return nullptr;
+  }
+  else
+  {
+    if (!context->CreateVersionContext(m_version, m_rc, false))
+      return nullptr;
+  }
+
+  context->m_version = m_version;
+  return context;
+}
+
+HDC ContextWGL::GetDCAndSetPixelFormat(HWND hwnd)
+{
+  PIXELFORMATDESCRIPTOR pfd = {};
+  pfd.nSize = sizeof(pfd);
+  pfd.nVersion = 1;
+  pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
+  pfd.iPixelType = PFD_TYPE_RGBA;
+  pfd.dwLayerMask = PFD_MAIN_PLANE;
+  pfd.cRedBits = 8;
+  pfd.cGreenBits = 8;
+  pfd.cBlueBits = 8;
+  pfd.cColorBits = 24;
+
+  HDC hDC = ::GetDC(hwnd);
+  if (!hDC)
+  {
+    Log_ErrorPrintf("GetDC() failed: 0x%08X", GetLastError());
+    return {};
+  }
+
+  if (!m_pixel_format.has_value())
+  {
+    const int pf = ChoosePixelFormat(hDC, &pfd);
+    if (pf == 0)
+    {
+      Log_ErrorPrintf("ChoosePixelFormat() failed: 0x%08X", GetLastError());
+      ::ReleaseDC(hwnd, hDC);
+      return {};
+    }
+
+    m_pixel_format = pf;
+  }
+
+  if (!SetPixelFormat(hDC, m_pixel_format.value(), &pfd))
+  {
+    Log_ErrorPrintf("SetPixelFormat() failed: 0x%08X", GetLastError());
+    ::ReleaseDC(hwnd, hDC);
+    return {};
+  }
+
+  return hDC;
+}
+
+bool ContextWGL::InitializeDC()
+{
+  if (m_wi.type == WindowInfo::Type::Win32)
+  {
+    m_dc = GetDCAndSetPixelFormat(GetHWND());
+    if (!m_dc)
+    {
+      Log_ErrorPrint("Failed to get DC for window");
+      return false;
+    }
+
+    return true;
+  }
+  else if (m_wi.type == WindowInfo::Type::Surfaceless)
+  {
+    return CreatePBuffer();
+  }
+  else
+  {
+    Log_ErrorPrintf("Unknown window info type %u", static_cast<unsigned>(m_wi.type));
+    return false;
+  }
+}
+
+void ContextWGL::ReleaseDC()
+{
+  if (m_pbuffer)
+  {
+    wglReleasePbufferDCARB(m_pbuffer, m_dc);
+    m_dc = {};
+
+    wglDestroyPbufferARB(m_pbuffer);
+    m_pbuffer = {};
+
+    ::ReleaseDC(m_dummy_window, m_dummy_dc);
+    m_dummy_dc = {};
+
+    DestroyWindow(m_dummy_window);
+    m_dummy_window = {};
+  }
+  else if (m_dc)
+  {
+    ::ReleaseDC(GetHWND(), m_dc);
+    m_dc = {};
+  }
+}
+
+bool ContextWGL::CreatePBuffer()
+{
+  static bool window_class_registered = false;
+  static const wchar_t* window_class_name = L"ContextWGLPBuffer";
+
+  if (!window_class_registered)
+  {
+    WNDCLASSEXW wc = {};
+    wc.cbSize = sizeof(WNDCLASSEXW);
+    wc.style = 0;
+    wc.lpfnWndProc = DefWindowProcW;
+    wc.cbClsExtra = 0;
+    wc.cbWndExtra = 0;
+    wc.hInstance = GetModuleHandle(nullptr);
+    wc.hIcon = NULL;
+    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
+    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
+    wc.lpszMenuName = NULL;
+    wc.lpszClassName = window_class_name;
+    wc.hIconSm = NULL;
+
+    if (!RegisterClassExW(&wc))
+    {
+      Log_ErrorPrint("(ContextWGL::CreatePBuffer) RegisterClassExW() failed");
+      return false;
+    }
+
+    window_class_registered = true;
+  }
+
+  HWND hwnd = CreateWindowExW(0, window_class_name, window_class_name, 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL);
+  if (!hwnd)
+  {
+    Log_ErrorPrint("(ContextWGL::CreatePBuffer) CreateWindowEx() failed");
+    return false;
+  }
+
+  ScopedGuard hwnd_guard([hwnd]() { DestroyWindow(hwnd); });
+
+  HDC hdc = GetDCAndSetPixelFormat(hwnd);
+  if (!hdc)
+    return false;
+
+  ScopedGuard hdc_guard([hdc, hwnd]() { ::ReleaseDC(hwnd, hdc); });
+
+  static constexpr const int pb_attribs[] = {0, 0};
+
+  AssertMsg(m_pixel_format.has_value(), "Has pixel format for pbuffer");
+  HPBUFFERARB pbuffer = wglCreatePbufferARB(hdc, m_pixel_format.value(), 1, 1, pb_attribs);
+  if (!pbuffer)
+  {
+    Log_ErrorPrint("(ContextWGL::CreatePBuffer) wglCreatePbufferARB() failed");
+    return false;
+  }
+
+  ScopedGuard pbuffer_guard([pbuffer]() { wglDestroyPbufferARB(pbuffer); });
+
+  m_dc = wglGetPbufferDCARB(pbuffer);
+  if (!m_dc)
+  {
+    Log_ErrorPrint("(ContextWGL::CreatePbuffer) wglGetPbufferDCARB() failed");
+    return false;
+  }
+
+  m_dummy_window = hwnd;
+  m_dummy_dc = hdc;
+  m_pbuffer = pbuffer;
+
+  pbuffer_guard.Cancel();
+  hdc_guard.Cancel();
+  hwnd_guard.Cancel();
+  return true;
+}
+
+bool ContextWGL::CreateAnyContext(HGLRC share_context, bool make_current)
+{
+  m_rc = wglCreateContext(m_dc);
+  if (!m_rc)
+  {
+    Log_ErrorPrintf("wglCreateContext() failed: 0x%08X", GetLastError());
+    return false;
+  }
+
+  if (make_current)
+  {
+    if (!wglMakeCurrent(m_dc, m_rc))
+    {
+      Log_ErrorPrintf("wglMakeCurrent() failed: 0x%08X", GetLastError());
+      return false;
+    }
+
+    // re-init glad-wgl
+    if (!gladLoadWGLLoader([](const char* name) -> void* { return reinterpret_cast<void*>(wglGetProcAddress(name)); }, m_dc))
+    {
+      Log_ErrorPrint("Loading GLAD WGL functions failed");
+      return false;
+    }
+  }
+
+  if (share_context && !wglShareLists(share_context, m_rc))
+  {
+    Log_ErrorPrintf("wglShareLists() failed: 0x%08X", GetLastError());
+    return false;
+  }
+
+  return true;
+}
+
+bool ContextWGL::CreateVersionContext(const Version& version, HGLRC share_context, bool make_current)
+{
+  // we need create context attribs
+  if (!GLAD_WGL_ARB_create_context)
+  {
+    Log_ErrorPrint("Missing GLAD_WGL_ARB_create_context.");
+    return false;
+  }
+
+  HGLRC new_rc;
+  if (version.profile == Profile::Core)
+  {
+    const int attribs[] = {WGL_CONTEXT_PROFILE_MASK_ARB,
+                           WGL_CONTEXT_CORE_PROFILE_BIT_ARB,
+                           WGL_CONTEXT_MAJOR_VERSION_ARB,
+                           version.major_version,
+                           WGL_CONTEXT_MINOR_VERSION_ARB,
+                           version.minor_version,
+#ifdef _DEBUG
+                           WGL_CONTEXT_FLAGS_ARB,
+                           WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB | WGL_CONTEXT_DEBUG_BIT_ARB,
+#else
+                           WGL_CONTEXT_FLAGS_ARB,
+                           WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
+#endif
+                           0,
+                           0};
+
+    new_rc = wglCreateContextAttribsARB(m_dc, share_context, attribs);
+  }
+  else if (version.profile == Profile::ES)
+  {
+    if ((version.major_version >= 2 && !GLAD_WGL_EXT_create_context_es2_profile) ||
+        (version.major_version < 2 && !GLAD_WGL_EXT_create_context_es_profile))
+    {
+      Log_ErrorPrint("WGL_EXT_create_context_es_profile not supported");
+      return false;
+    }
+
+    const int attribs[] = {
+      WGL_CONTEXT_PROFILE_MASK_ARB,
+      ((version.major_version >= 2) ? WGL_CONTEXT_ES2_PROFILE_BIT_EXT : WGL_CONTEXT_ES_PROFILE_BIT_EXT),
+      WGL_CONTEXT_MAJOR_VERSION_ARB,
+      version.major_version,
+      WGL_CONTEXT_MINOR_VERSION_ARB,
+      version.minor_version,
+      0,
+      0};
+
+    new_rc = wglCreateContextAttribsARB(m_dc, share_context, attribs);
+  }
+  else
+  {
+    Log_ErrorPrint("Unknown profile");
+    return false;
+  }
+
+  if (!new_rc)
+    return false;
+
+  // destroy and swap contexts
+  if (m_rc)
+  {
+    if (!wglMakeCurrent(m_dc, make_current ? new_rc : nullptr))
+    {
+      Log_ErrorPrintf("wglMakeCurrent() failed: 0x%08X", GetLastError());
+      wglDeleteContext(new_rc);
+      return false;
+    }
+
+    // re-init glad-wgl
+    if (make_current && !gladLoadWGLLoader([](const char* name) -> void* { return reinterpret_cast<void*>(wglGetProcAddress(name)); }, m_dc))
+    {
+      Log_ErrorPrint("Loading GLAD WGL functions failed");
+      return false;
+    }
+
+    wglDeleteContext(m_rc);
+  }
+
+  m_rc = new_rc;
+  return true;
+}
+} // namespace GL

third_party/duckstation/gl/context_wgl.h

@@ -0,0 +1,53 @@
+#pragma once
+#include "windows_headers.h"
+
+#include "context.h"
+#include <glad/glad_wgl.h>
+#include "loader.h"
+#include <optional>
+
+namespace GL {
+
+class ContextWGL final : public Context
+{
+public:
+  ContextWGL(const WindowInfo& wi);
+  ~ContextWGL() override;
+
+  static std::unique_ptr<Context> Create(const WindowInfo& wi, const Version* versions_to_try,
+                                         size_t num_versions_to_try);
+
+  void* GetProcAddress(const char* name) override;
+  bool ChangeSurface(const WindowInfo& new_wi) override;
+  void ResizeSurface(u32 new_surface_width = 0, u32 new_surface_height = 0) override;
+  bool SwapBuffers() override;
+  bool MakeCurrent() override;
+  bool DoneCurrent() override;
+  bool SetSwapInterval(s32 interval) override;
+  std::unique_ptr<Context> CreateSharedContext(const WindowInfo& wi) override;
+
+private:
+  ALWAYS_INLINE HWND GetHWND() const { return static_cast<HWND>(m_wi.window_handle); }
+
+  HDC GetDCAndSetPixelFormat(HWND hwnd);
+
+  bool Initialize(const Version* versions_to_try, size_t num_versions_to_try);
+  bool InitializeDC();
+  void ReleaseDC();
+  bool CreatePBuffer();
+  bool CreateAnyContext(HGLRC share_context, bool make_current);
+  bool CreateVersionContext(const Version& version, HGLRC share_context, bool make_current);
+
+  HDC m_dc = {};
+  HGLRC m_rc = {};
+
+  // Can't change pixel format once it's set for a RC.
+  std::optional<int> m_pixel_format;
+
+  // Dummy window for creating a PBuffer off when we're surfaceless.
+  HWND m_dummy_window = {};
+  HDC m_dummy_dc = {};
+  HPBUFFERARB m_pbuffer = {};
+};
+
+} // namespace GL

third_party/duckstation/gl/loader.h

@@ -0,0 +1,8 @@
+#pragma once
+
+// Fix glad.h including windows.h
+#ifdef _WIN32
+#include "windows_headers.h"
+#endif
+
+#include <glad/gl.h>

third_party/duckstation/gl/x11_window.cpp

@@ -0,0 +1,101 @@
+#include "x11_window.h"
+#include "duckstation_log.h"
+#include "duckstation_compat.h"
+#include <cstdio>
+Log_SetChannel(X11Window);
+
+namespace GL {
+X11Window::X11Window() = default;
+
+X11Window::~X11Window()
+{
+  Destroy();
+}
+
+bool X11Window::Create(Display* display, Window parent_window, const XVisualInfo* vi)
+{
+  m_display = display;
+  m_parent_window = parent_window;
+  XSync(m_display, True);
+
+  XWindowAttributes parent_wa = {};
+  XGetWindowAttributes(m_display, m_parent_window, &parent_wa);
+  m_width = static_cast<u32>(parent_wa.width);
+  m_height = static_cast<u32>(parent_wa.height);
+
+  // Failed X calls terminate the process so no need to check for errors.
+  // We could swap the error handler out here as well.
+  m_colormap = XCreateColormap(m_display, m_parent_window, vi->visual, AllocNone);
+
+  XSetWindowAttributes wa = {};
+  wa.colormap = m_colormap;
+
+  m_window = XCreateWindow(m_display, m_parent_window, 0, 0, m_width, m_height, 0, vi->depth, InputOutput, vi->visual,
+                           CWColormap, &wa);
+  XMapWindow(m_display, m_window);
+  XSync(m_display, True);
+
+  return true;
+}
+
+void X11Window::Destroy()
+{
+  if (m_window)
+  {
+    XUnmapWindow(m_display, m_window);
+    XDestroyWindow(m_display, m_window);
+    m_window = {};
+  }
+
+  if (m_colormap)
+  {
+    XFreeColormap(m_display, m_colormap);
+    m_colormap = {};
+  }
+}
+
+void X11Window::Resize(u32 width, u32 height)
+{
+  if (width != 0 && height != 0)
+  {
+    m_width = width;
+    m_height = height;
+  }
+  else
+  {
+    XWindowAttributes parent_wa = {};
+    XGetWindowAttributes(m_display, m_parent_window, &parent_wa);
+    m_width = static_cast<u32>(parent_wa.width);
+    m_height = static_cast<u32>(parent_wa.height);
+  }
+
+  XResizeWindow(m_display, m_window, m_width, m_height);
+}
+
+static X11InhibitErrors* s_current_error_inhibiter;
+
+X11InhibitErrors::X11InhibitErrors()
+{
+  Assert(!s_current_error_inhibiter);
+  m_old_handler = XSetErrorHandler(ErrorHandler);
+  s_current_error_inhibiter = this;
+}
+
+X11InhibitErrors::~X11InhibitErrors()
+{
+  Assert(s_current_error_inhibiter == this);
+  s_current_error_inhibiter = nullptr;
+  XSetErrorHandler(m_old_handler);
+}
+
+int X11InhibitErrors::ErrorHandler(Display* display, XErrorEvent* ee)
+{
+  char error_string[256] = {};
+  XGetErrorText(display, ee->error_code, error_string, sizeof(error_string));
+  Log_WarningPrintf("X11 Error: %s (Error %u Minor %u Request %u)", error_string, ee->error_code, ee->minor_code,
+                    ee->request_code);
+
+  s_current_error_inhibiter->m_had_error = true;
+  return 0;
+}
+} // namespace GL

third_party/duckstation/gl/x11_window.h

@@ -0,0 +1,48 @@
+#pragma once
+#include "duckstation_compat.h"
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+
+namespace GL {
+class X11Window
+{
+public:
+  X11Window();
+  ~X11Window();
+
+  ALWAYS_INLINE Window GetWindow() const { return m_window; }
+  ALWAYS_INLINE u32 GetWidth() const { return m_width; }
+  ALWAYS_INLINE u32 GetHeight() const { return m_height; }
+
+  bool Create(Display* display, Window parent_window, const XVisualInfo* vi);
+  void Destroy();
+
+  // Setting a width/height of 0 will use parent dimensions.
+  void Resize(u32 width = 0, u32 height = 0);
+
+private:
+  Display* m_display = nullptr;
+  Window m_parent_window = {};
+  Window m_window = {};
+  Colormap m_colormap = {};
+  u32 m_width = 0;
+  u32 m_height = 0;
+};
+
+// Helper class for managing X errors
+class X11InhibitErrors
+{
+public:
+  X11InhibitErrors();
+  ~X11InhibitErrors();
+
+  ALWAYS_INLINE bool HadError() const { return m_had_error; }
+
+private:
+  static int ErrorHandler(Display* display, XErrorEvent* ee);
+
+  XErrorHandler m_old_handler = {};
+  bool m_had_error = false;
+};
+
+} // namespace GL