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// Copyright (c) 2010 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 <dlfcn.h>
#include "base/logging.h"
#include "app/gfx/gl/gl_bindings.h"
#include "app/gfx/gl/gl_context_stub.h"
#include "app/gfx/gl/gl_implementation.h"
namespace gfx {
namespace {
typedef void* (*GetProcAddressProc)(const char* name);
GLImplementation g_gl_implementation = kGLImplementationNone;
void* g_shared_library;
GetProcAddressProc g_get_proc_address;
} // namespace anonymous
bool InitializeGLBindings(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.
if (g_gl_implementation != kGLImplementationNone)
return true;
switch (implementation) {
case kGLImplementationDesktopGL:
g_shared_library = dlopen("libGL.so.1", RTLD_LAZY | RTLD_LOCAL);
if (!g_shared_library)
return false;
g_gl_implementation = kGLImplementationDesktopGL;
g_get_proc_address = reinterpret_cast<GetProcAddressProc>(
dlsym(g_shared_library, "glXGetProcAddress"));
CHECK(g_get_proc_address);
InitializeGLBindingsGL();
InitializeGLBindingsGLX();
break;
case kGLImplementationMockGL:
g_get_proc_address = GetMockGLProcAddress;
g_gl_implementation = kGLImplementationMockGL;
InitializeGLBindingsGL();
break;
default:
return false;
}
return true;
}
GLImplementation GetGLImplementation() {
return g_gl_implementation;
}
void* GetGLProcAddress(const char* name) {
DCHECK(g_gl_implementation != kGLImplementationNone);
if (g_get_proc_address) {
void* proc = g_get_proc_address(name);
if (proc)
return proc;
}
if (g_shared_library) {
void* proc = dlsym(g_shared_library, name);
if (proc)
return proc;
}
return NULL;
}
} // namespace gfx
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