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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 "ui/gl/gl_context.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/sys_info.h"
#include "ui/gl/gl_bindings.h"
#include "ui/gl/gl_context_egl.h"
#include "ui/gl/gl_context_osmesa.h"
#include "ui/gl/gl_context_stub.h"
#include "ui/gl/gl_implementation.h"
#include "ui/gl/gl_surface.h"
namespace gfx {
namespace {
// Used to render into an already current context+surface,
// that we do not have ownership of (draw callback).
// TODO(boliu): Make this inherit from GLContextEGL.
class GLNonOwnedContext : public GLContextReal {
public:
GLNonOwnedContext(GLShareGroup* share_group);
// Implement GLContext.
bool Initialize(GLSurface* compatible_surface,
GpuPreference gpu_preference) override;
bool MakeCurrent(GLSurface* surface) override;
void ReleaseCurrent(GLSurface* surface) override {}
bool IsCurrent(GLSurface* surface) override { return true; }
void* GetHandle() override { return nullptr; }
void OnSetSwapInterval(int interval) override {}
std::string GetExtensions() override;
protected:
~GLNonOwnedContext() override {}
private:
EGLDisplay display_;
DISALLOW_COPY_AND_ASSIGN(GLNonOwnedContext);
};
GLNonOwnedContext::GLNonOwnedContext(GLShareGroup* share_group)
: GLContextReal(share_group), display_(nullptr) {}
bool GLNonOwnedContext::Initialize(GLSurface* compatible_surface,
GpuPreference gpu_preference) {
display_ = eglGetDisplay(EGL_DEFAULT_DISPLAY);
return true;
}
bool GLNonOwnedContext::MakeCurrent(GLSurface* surface) {
SetCurrent(surface);
SetRealGLApi();
return true;
}
std::string GLNonOwnedContext::GetExtensions() {
const char* extensions = eglQueryString(display_, EGL_EXTENSIONS);
if (!extensions)
return GLContext::GetExtensions();
return GLContext::GetExtensions() + " " + extensions;
}
} // anonymous namespace
// static
scoped_refptr<GLContext> GLContext::CreateGLContext(
GLShareGroup* share_group,
GLSurface* compatible_surface,
GpuPreference gpu_preference) {
scoped_refptr<GLContext> context;
switch (GetGLImplementation()) {
case kGLImplementationMockGL:
return scoped_refptr<GLContext>(new GLContextStub());
case kGLImplementationOSMesaGL:
context = new GLContextOSMesa(share_group);
break;
default:
if (compatible_surface->GetHandle())
context = new GLContextEGL(share_group);
else
context = new GLNonOwnedContext(share_group);
break;
}
if (!context->Initialize(compatible_surface, gpu_preference))
return nullptr;
return context;
}
}
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