Implement GLX for Ozone X11.

ui/gl/gl_implementation_ozone.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/bind.h"
+#include "base/command_line.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_context_stub_with_extensions.h"
 #include "ui/gl/gl_egl_api_implementation.h"
 #include "ui/gl/gl_gl_api_implementation.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_implementation_osmesa.h"
 #include "ui/gl/gl_osmesa_api_implementation.h"
 #include "ui/ozone/public/ozone_platform.h"
 #include "ui/ozone/public/surface_factory_ozone.h"
 
+#if defined(USE_GLX)
+#include "ui/gl/gl_glx_api_implementation.h"
+#endif
+
 namespace gfx {
 
 namespace {
 
 void GL_BINDING_CALL MarshalClearDepthToClearDepthf(GLclampd depth) {
   glClearDepthf(static_cast<GLclampf>(depth));
 }
 
 void GL_BINDING_CALL MarshalDepthRangeToDepthRangef(GLclampd z_near,
                                                     GLclampd z_far) {
   glDepthRangef(static_cast<GLclampf>(z_near), static_cast<GLclampf>(z_far));
 }
 
+#if defined(USE_GLX)
+#if defined(OS_OPENBSD)
+const char kGLLibraryName[] = "libGL.so";
+#else
+const char kGLLibraryName[] = "libGL.so.1";
+#endif
+#endif
+
 }  // namespace
 
 void GetAllowedGLImplementations(std::vector<GLImplementation>* impls) {
+#if defined(USE_GLX)
+  // TODO: Discuss/change this before submitting CL.

[kylechar, 2016/03/23 15:40:09]

This isn't great. GetAllowedGLImplementations is called before
InitializeStaticGLBindings where OzonePlatform::InitializeForUI() was called
before. So we need to initialize it earlier. The call to
GetAllowedGLImplementation is basically the first thing in the generic
GLSurface::InitializeOneOff(), which comes before the platform specific
GLSurface::InitializeOneOffImplementation() call.

+  ui::OzonePlatform::InitializeForGPU();
+  // DesktopGL implies GLX on Linux. We only support GLX running the Ozone X11
+  // platform, which requires a runtime check.
+  if (ui::OzonePlatform::GetInstance()->GetSurfaceFactoryOzone()->SupportsGLX())
+    impls->push_back(kGLImplementationDesktopGL);
+#endif
   impls->push_back(kGLImplementationEGLGLES2);
   impls->push_back(kGLImplementationOSMesaGL);
 }
 
 bool InitializeStaticGLBindings(GLImplementation implementation) {
   // Prevent reinitialization with a different implementation. Once the gpu
   // unit tests have initialized with kGLImplementationMock, we don't want to
   // later switch to another GL implementation.
   DCHECK_EQ(kGLImplementationNone, GetGLImplementation());
   ui::OzonePlatform::InitializeForGPU();
 
   switch (implementation) {
     case kGLImplementationOSMesaGL:
       return InitializeStaticGLBindingsOSMesaGL();
+#if defined(USE_GLX)
+    case kGLImplementationDesktopGL: {
+      const base::CommandLine* command_line =
+          base::CommandLine::ForCurrentProcess();
+
+      base::NativeLibrary library = nullptr;
+      if (command_line->HasSwitch(switches::kTestGLLib)) {
+        library = LoadLibraryAndPrintError(
+            command_line->GetSwitchValueASCII(switches::kTestGLLib).c_str());
+      } else {
+        library = LoadLibraryAndPrintError(kGLLibraryName);
+      }
+
+      if (!library)
+        return false;
+
+      GLGetProcAddressProc get_proc_address =
+          reinterpret_cast<GLGetProcAddressProc>(
+              base::GetFunctionPointerFromNativeLibrary(library,
+                                                        "glXGetProcAddress"));
+      if (!get_proc_address) {
+        LOG(ERROR) << "glxGetProcAddress not found.";
+        base::UnloadNativeLibrary(library);
+        return false;
+      }
+
+      SetGLGetProcAddressProc(get_proc_address);
+      AddGLNativeLibrary(library);
+      SetGLImplementation(kGLImplementationDesktopGL);
+
+      InitializeStaticGLBindingsGL();
+      InitializeStaticGLBindingsGLX();
+      break;
+    }
+#endif
     case kGLImplementationEGLGLES2:
       if (!ui::OzonePlatform::GetInstance()
                ->GetSurfaceFactoryOzone()
                ->LoadEGLGLES2Bindings(base::Bind(&AddGLNativeLibrary),
                                       base::Bind(&SetGLGetProcAddressProc)))
         return false;
       SetGLImplementation(kGLImplementationEGLGLES2);
       InitializeStaticGLBindingsGL();
       InitializeStaticGLBindingsEGL();
 
@@ skipping 13 matching lines @@
       return false;
   }
 
   return true;
 }
 
 bool InitializeDynamicGLBindings(GLImplementation implementation,
                                  GLContext* context) {
   switch (implementation) {
     case kGLImplementationOSMesaGL:
+    case kGLImplementationDesktopGL:
     case kGLImplementationEGLGLES2:
       InitializeDynamicGLBindingsGL(context);
       break;
     case kGLImplementationMockGL:
       if (!context) {
         scoped_refptr<GLContextStubWithExtensions> mock_context(
             new GLContextStubWithExtensions());
         mock_context->SetGLVersionString("3.0");
         InitializeDynamicGLBindingsGL(mock_context.get());
-      } else
+      } else {
         InitializeDynamicGLBindingsGL(context);
+      }
       break;
     default:
       return false;
   }
 
   return true;
 }
 
 void InitializeDebugGLBindings() {
+  InitializeDebugGLBindingsEGL();
+  InitializeDebugGLBindingsGL();
+#if defined(USE_GLX)
+  InitializeDebugGLBindingsGLX();
+#endif
+  InitializeDebugGLBindingsOSMESA();
 }
 
 void ClearGLBindings() {
   ClearGLBindingsEGL();
   ClearGLBindingsGL();
+#if defined(USE_GLX)
+  ClearGLBindingsGLX();
+#endif
+  ClearGLBindingsOSMESA();
   SetGLImplementation(kGLImplementationNone);
   UnloadGLNativeLibraries();
 }
 
 bool GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo* info) {
   switch (GetGLImplementation()) {
+#if defined(USE_GLX)
+    case kGLImplementationDesktopGL:
+      return GetGLWindowSystemBindingInfoGLX(info);
+#endif
     case kGLImplementationEGLGLES2:
       return GetGLWindowSystemBindingInfoEGL(info);
     default:
       return false;
   }
   return false;
 }
 
 }  // namespace gfx