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// 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 <vector>
#include "base/command_line.h"
#include "base/logging.h"
#include "base/threading/thread_restrictions.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_glx_api_implementation.h"
#include "ui/gl/gl_implementation.h"
#include "ui/gl/gl_implementation_linux.h"
#include "ui/gl/gl_osmesa_api_implementation.h"
#include "ui/gl/gl_switches.h"
namespace gfx {
namespace {
// TODO(piman): it should be Desktop GL marshalling from double to float. Today
// on native GLES, we do float->double->float.
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));
}
} // namespace
void GetAllowedGLImplementations(std::vector<GLImplementation>* impls) {
impls->push_back(kGLImplementationDesktopGL);
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());
// Allow the main thread or another to initialize these bindings
// after instituting restrictions on I/O. Going forward they will
// likely be used in the browser process on most platforms. The
// one-time initialization cost is small, between 2 and 5 ms.
base::ThreadRestrictions::ScopedAllowIO allow_io;
switch (implementation) {
case kGLImplementationOSMesaGL:
return InitializeStaticGLBindingsOSMesaGL();
case kGLImplementationDesktopGL: {
base::NativeLibrary library = NULL;
const CommandLine* command_line = CommandLine::ForCurrentProcess();
if (command_line->HasSwitch(switches::kTestGLLib))
library = LoadLibrary(command_line->GetSwitchValueASCII(
switches::kTestGLLib).c_str());
if (!library) {
#if defined(OS_OPENBSD)
library = LoadLibrary("libGL.so");
#else
library = LoadLibrary("libGL.so.1");
#endif
}
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;
}
case kGLImplementationEGLGLES2: {
base::NativeLibrary gles_library = LoadLibrary("libGLESv2.so.2");
if (!gles_library)
return false;
base::NativeLibrary egl_library = LoadLibrary("libEGL.so.1");
if (!egl_library) {
base::UnloadNativeLibrary(gles_library);
return false;
}
GLGetProcAddressProc get_proc_address =
reinterpret_cast<GLGetProcAddressProc>(
base::GetFunctionPointerFromNativeLibrary(
egl_library, "eglGetProcAddress"));
if (!get_proc_address) {
LOG(ERROR) << "eglGetProcAddress not found.";
base::UnloadNativeLibrary(egl_library);
base::UnloadNativeLibrary(gles_library);
return false;
}
SetGLGetProcAddressProc(get_proc_address);
AddGLNativeLibrary(egl_library);
AddGLNativeLibrary(gles_library);
SetGLImplementation(kGLImplementationEGLGLES2);
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 kGLImplementationMockGL: {
SetGLImplementation(kGLImplementationMockGL);
InitializeStaticGLBindingsGL();
break;
}
default:
return false;
}
return true;
}
bool InitializeDynamicGLBindings(GLImplementation implementation,
GLContext* context) {
switch (implementation) {
case kGLImplementationOSMesaGL:
InitializeDynamicGLBindingsGL(context);
InitializeDynamicGLBindingsOSMESA(context);
break;
case kGLImplementationDesktopGL:
InitializeDynamicGLBindingsGL(context);
InitializeDynamicGLBindingsGLX(context);
break;
case kGLImplementationEGLGLES2:
InitializeDynamicGLBindingsGL(context);
InitializeDynamicGLBindingsEGL(context);
break;
case kGLImplementationMockGL:
if (!context) {
scoped_refptr<GLContextStubWithExtensions> mock_context(
new GLContextStubWithExtensions());
mock_context->SetGLVersionString("3.0");
InitializeDynamicGLBindingsGL(mock_context.get());
} else
InitializeDynamicGLBindingsGL(context);
break;
default:
return false;
}
return true;
}
void InitializeDebugGLBindings() {
InitializeDebugGLBindingsEGL();
InitializeDebugGLBindingsGL();
InitializeDebugGLBindingsGLX();
InitializeDebugGLBindingsOSMESA();
}
void ClearGLBindings() {
ClearGLBindingsEGL();
ClearGLBindingsGL();
ClearGLBindingsGLX();
ClearGLBindingsOSMESA();
SetGLImplementation(kGLImplementationNone);
UnloadGLNativeLibraries();
}
bool GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo* info) {
switch (GetGLImplementation()) {
case kGLImplementationDesktopGL:
return GetGLWindowSystemBindingInfoGLX(info);
case kGLImplementationEGLGLES2:
return GetGLWindowSystemBindingInfoEGL(info);
default:
return false;
}
return false;
}
} // namespace gfx
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