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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 <vector>
#include "base/at_exit.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;
typedef std::vector<void*> PointerArray;
PointerArray* g_shared_libraries = NULL;
GetProcAddressProc g_get_proc_address;
// 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));
}
void CleanupSharedLibraries(void* unused) {
if (g_shared_libraries) {
for (PointerArray::iterator it = g_shared_libraries->begin();
it != g_shared_libraries->end(); ++it) {
dlclose(*it);
}
delete g_shared_libraries;
g_shared_libraries = NULL;
}
}
} // 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;
if (!g_shared_libraries) {
g_shared_libraries = new PointerArray();
base::AtExitManager::RegisterCallback(CleanupSharedLibraries, NULL);
}
void* shared_library = NULL;
switch (implementation) {
case kGLImplementationDesktopGL:
DLOG(INFO) << "Initializing Desktop GL";
shared_library = dlopen("libGL.so.1", RTLD_LAZY | RTLD_LOCAL);
if (!shared_library) {
DLOG(ERROR) << "Failed to load libGL.so.1";
return false;
}
g_shared_libraries->push_back(shared_library);
g_gl_implementation = kGLImplementationDesktopGL;
g_get_proc_address = reinterpret_cast<GetProcAddressProc>(
dlsym(shared_library, "glXGetProcAddress"));
CHECK(g_get_proc_address);
InitializeGLBindingsGL();
InitializeGLBindingsGLX();
break;
case kGLImplementationEGLGLES2:
DLOG(INFO) << "Initializing EGL";
shared_library = dlopen("libEGL.so", RTLD_LAZY | RTLD_LOCAL);
if (!shared_library) {
DLOG(ERROR) << "Failed to load libEGL.so";
return false;
}
g_gl_implementation = kGLImplementationEGLGLES2;
g_get_proc_address = reinterpret_cast<GetProcAddressProc>(
dlsym(shared_library, "eglGetProcAddress"));
DCHECK(g_get_proc_address);
g_shared_libraries->push_back(shared_library);
shared_library = dlopen("libGLESv2.so", RTLD_LAZY | RTLD_LOCAL);
if (!shared_library) {
DLOG(ERROR) << "Failed to load libGLESv2.so";
g_shared_libraries->clear();
return false;
}
DCHECK(shared_library);
g_shared_libraries->push_back(shared_library);
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 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_libraries) {
for (PointerArray::iterator it = g_shared_libraries->begin();
it != g_shared_libraries->end(); ++it) {
void* proc = dlsym(*it, name);
if (proc)
return proc;
}
}
return NULL;
}
} // namespace gfx
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