1 files changed, 328 insertions, 0 deletions
diff --git a/src/frontend/duckstation/gl/context_glx.cpp b/src/frontend/duckstation/gl/context_glx.cpp
new file mode 100644
index 0000000..bd32039
--- /dev/null
+++ b/src/frontend/duckstation/gl/context_glx.cpp
@@ -0,0 +1,328 @@
+#include "context_glx.h"
+#include "../duckstation_compat.h"
+#include "../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