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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 <vector>
#include "base/base_paths.h"
#include "base/file_path.h"
#include "base/logging.h"
#include "base/native_library.h"
#include "base/path_service.h"
#include "app/gfx/gl/gl_bindings.h"
#include "app/gfx/gl/gl_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));
}
} // 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 (GetGLImplementation() != kGLImplementationNone)
return true;
switch (implementation) {
case kGLImplementationOSMesaGL: {
FilePath module_path;
if (!PathService::Get(base::DIR_MODULE, &module_path)) {
LOG(ERROR) << "PathService::Get failed.";
return false;
}
base::NativeLibrary library = base::LoadNativeLibrary(
module_path.Append(L"osmesa.dll"));
if (!library) {
DLOG(INFO) << "osmesa.dll not found";
return false;
}
GLGetProcAddressProc get_proc_address =
reinterpret_cast<GLGetProcAddressProc>(
base::GetFunctionPointerFromNativeLibrary(
library, "OSMesaGetProcAddress"));
if (!get_proc_address) {
DLOG(ERROR) << "OSMesaGetProcAddress not found.";
base::UnloadNativeLibrary(library);
return false;
}
SetGLGetProcAddressProc(get_proc_address);
AddGLNativeLibrary(library);
SetGLImplementation(kGLImplementationOSMesaGL);
InitializeGLBindingsGL();
InitializeGLBindingsOSMESA();
break;
}
case kGLImplementationEGLGLES2: {
FilePath module_path;
if (!PathService::Get(base::DIR_MODULE, &module_path))
return false;
// Load libglesv2.dll before libegl.dll because the latter is dependent on
// the former and if there is another version of libglesv2.dll in the dll
// search path, it will get loaded.
base::NativeLibrary gles_library = base::LoadNativeLibrary(
module_path.Append(L"libglesv2.dll"));
if (!gles_library) {
LOG(ERROR) << "libglesv2.dll not found";
return false;
}
// When using EGL, first try eglGetProcAddress and then Windows
// GetProcAddress on both the EGL and GLES2 DLLs.
base::NativeLibrary egl_library = base::LoadNativeLibrary(
module_path.Append(L"libegl.dll"));
if (!egl_library) {
LOG(ERROR) << "libegl.dll not found.";
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);
InitializeGLBindingsGL();
InitializeGLBindingsEGL();
// These two functions take single precision float rather than double
// precision float parameters in GLES.
::gfx::g_glClearDepth = MarshalClearDepthToClearDepthf;
::gfx::g_glDepthRange = MarshalDepthRangeToDepthRangef;
break;
}
case kGLImplementationDesktopGL: {
// When using Windows OpenGL, first try wglGetProcAddress and then
// Windows GetProcAddress.
base::NativeLibrary library = base::LoadNativeLibrary(
FilePath(L"opengl32.dll"));
if (!library) {
LOG(INFO) << "opengl32.dll not found";
return false;
}
GLGetProcAddressProc get_proc_address =
reinterpret_cast<GLGetProcAddressProc>(
base::GetFunctionPointerFromNativeLibrary(
library, "wglGetProcAddress"));
if (!get_proc_address) {
LOG(ERROR) << "wglGetProcAddress not found.";
base::UnloadNativeLibrary(library);
return false;
}
SetGLGetProcAddressProc(get_proc_address);
AddGLNativeLibrary(library);
SetGLImplementation(kGLImplementationDesktopGL);
InitializeGLBindingsGL();
InitializeGLBindingsWGL();
break;
}
case kGLImplementationMockGL: {
SetGLGetProcAddressProc(GetMockGLProcAddress);
SetGLImplementation(kGLImplementationMockGL);
InitializeGLBindingsGL();
break;
}
default:
return false;
}
return true;
}
} // namespace gfx
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