Make it possible to use OSMesa on Android

ui/gl/gl_implementation_android.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/base_paths.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/native_library.h"
 #include "base/path_service.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"
 
 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));
 }
 
-base::NativeLibrary LoadLibrary(const base::FilePath& filename) {
-  std::string error;
-  base::NativeLibrary library = base::LoadNativeLibrary(filename, &error);
-  if (!library) {
-    DVLOG(1) << "Failed to load " << filename.MaybeAsASCII() << ": " << error;
-    return NULL;
-  }
-  return library;
-}
-
-base::NativeLibrary LoadLibrary(const char* filename) {
-  return LoadLibrary(base::FilePath(filename));
-}
-
 }  // namespace
 
 void GetAllowedGLImplementations(std::vector<GLImplementation>* impls) {
   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());
 
   switch (implementation) {
     case kGLImplementationEGLGLES2: {
@@ skipping 27 matching lines @@
 
       InitializeStaticGLBindingsGL();
       InitializeStaticGLBindingsEGL();
 
       // These two functions take single precision float rather than double
       // precision float parameters in GLES.
       ::gfx::g_driver_gl.fn.glClearDepthFn = MarshalClearDepthToClearDepthf;
       ::gfx::g_driver_gl.fn.glDepthRangeFn = MarshalDepthRangeToDepthRangef;
       break;
     }
+    case kGLImplementationOSMesaGL:
+      return InitializeStaticGLBindingsOSMesaGL();

[Sami, 2014/02/19 18:42:43]

nit: To make this a tiny bit more consistent, instead of returning here just
fall through to the "return true" at the bottom of this function.

     case kGLImplementationMockGL: {
       SetGLImplementation(kGLImplementationMockGL);
       InitializeStaticGLBindingsGL();
       break;
     }
     default:
       NOTIMPLEMENTED() << "InitializeStaticGLBindings on Android";
       return false;
   }
 
   return true;
 }
 
 bool InitializeDynamicGLBindings(GLImplementation implementation,
                                  GLContext* context) {
   switch (implementation) {
     case kGLImplementationEGLGLES2:
       InitializeDynamicGLBindingsGL(context);
       InitializeDynamicGLBindingsEGL(context);
       break;
+    case kGLImplementationOSMesaGL:
+      InitializeDynamicGLBindingsGL(context);
+      InitializeDynamicGLBindingsOSMESA(context);
+      break;
     case kGLImplementationMockGL:
       if (!context) {
         scoped_refptr<GLContextStubWithExtensions> mock_context(
             new GLContextStubWithExtensions());
         mock_context->SetGLVersionString("opengl es 3.0");
         InitializeDynamicGLBindingsGL(mock_context.get());
       } else
         InitializeDynamicGLBindingsGL(context);
       break;
     default:
       NOTREACHED() << "InitializeDynamicGLBindings on Android";
       return false;
   }
 
   return true;
 }
 
 void InitializeDebugGLBindings() {
   InitializeDebugGLBindingsEGL();
   InitializeDebugGLBindingsGL();
+  InitializeDebugGLBindingsOSMESA();
 }
 
 void ClearGLBindings() {
   ClearGLBindingsEGL();
   ClearGLBindingsGL();
+  ClearGLBindingsOSMESA();
   SetGLImplementation(kGLImplementationNone);
 
   UnloadGLNativeLibraries();
 }
 
 bool GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo* info) {
   switch (GetGLImplementation()) {
     case kGLImplementationEGLGLES2:
       return GetGLWindowSystemBindingInfoEGL(info);
     default:
       return false;
   }
   return false;
 }
 
 }  // namespace gfx