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// Copyright 2016 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/init/gl_factory.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/trace_event/trace_event.h"
#include "ui/gl/buildflags.h"
#include "ui/gl/gl_bindings.h"
#include "ui/gl/gl_context_cgl.h"
#include "ui/gl/gl_context_stub.h"
#include "ui/gl/gl_implementation.h"
#include "ui/gl/gl_share_group.h"
#include "ui/gl/gl_surface.h"
#include "ui/gl/gl_surface_stub.h"
#include "ui/gl/gl_switches.h"
#if BUILDFLAG(USE_EGL_ON_MAC)
#include "ui/gl/gl_context_egl.h"
#include "ui/gl/gl_surface_egl.h"
#endif // BUILDFLAG(USE_EGL_ON_MAC)
namespace gl {
namespace init {
namespace {
// A "no-op" surface. It is not required that a CGLContextObj have an
// associated drawable (pbuffer or fullscreen context) in order to be
// made current. Everywhere this surface type is used, we allocate an
// FBO at the user level as the drawable of the associated context.
class NoOpGLSurface : public GLSurface {
public:
explicit NoOpGLSurface(const gfx::Size& size) : size_(size) {}
// Implement GLSurface.
bool Initialize(GLSurfaceFormat format) override { return true; }
void Destroy() override {}
bool IsOffscreen() override { return true; }
gfx::SwapResult SwapBuffers(const PresentationCallback& callback) override {
NOTREACHED() << "Cannot call SwapBuffers on a NoOpGLSurface.";
return gfx::SwapResult::SWAP_FAILED;
}
gfx::Size GetSize() override { return size_; }
void* GetHandle() override { return nullptr; }
void* GetDisplay() override { return nullptr; }
bool IsSurfaceless() const override { return true; }
GLSurfaceFormat GetFormat() override { return GLSurfaceFormat(); }
protected:
~NoOpGLSurface() override {}
private:
gfx::Size size_;
DISALLOW_COPY_AND_ASSIGN(NoOpGLSurface);
};
} // namespace
std::vector<GLImplementation> GetAllowedGLImplementations() {
std::vector<GLImplementation> impls;
impls.push_back(kGLImplementationDesktopGLCoreProfile);
impls.push_back(kGLImplementationDesktopGL);
impls.push_back(kGLImplementationAppleGL);
#if BUILDFLAG(USE_EGL_ON_MAC)
impls.push_back(kGLImplementationEGLGLES2);
impls.push_back(kGLImplementationSwiftShaderGL);
#endif // BUILDFLAG(USE_EGL_ON_MAC)
return impls;
}
bool GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo* info) {
return false;
}
scoped_refptr<GLContext> CreateGLContext(GLShareGroup* share_group,
GLSurface* compatible_surface,
const GLContextAttribs& attribs) {
TRACE_EVENT0("gpu", "gl::init::CreateGLContext");
switch (GetGLImplementation()) {
case kGLImplementationDesktopGL:
case kGLImplementationDesktopGLCoreProfile:
case kGLImplementationAppleGL:
return InitializeGLContext(new GLContextCGL(share_group),
compatible_surface, attribs);
#if BUILDFLAG(USE_EGL_ON_MAC)
case kGLImplementationEGLGLES2:
case kGLImplementationSwiftShaderGL:
return InitializeGLContext(new GLContextEGL(share_group),
compatible_surface, attribs);
#endif // BUILDFLAG(USE_EGL_ON_MAC)
case kGLImplementationMockGL:
return new GLContextStub(share_group);
case kGLImplementationStubGL: {
scoped_refptr<GLContextStub> stub_context =
new GLContextStub(share_group);
stub_context->SetUseStubApi(true);
return stub_context;
}
default:
NOTREACHED();
return nullptr;
}
}
scoped_refptr<GLSurface> CreateViewGLSurface(gfx::AcceleratedWidget window) {
TRACE_EVENT0("gpu", "gl::init::CreateViewGLSurface");
switch (GetGLImplementation()) {
case kGLImplementationDesktopGL:
case kGLImplementationDesktopGLCoreProfile:
case kGLImplementationAppleGL:
case kGLImplementationEGLGLES2:
case kGLImplementationSwiftShaderGL: {
NOTIMPLEMENTED() << "No onscreen support on Mac.";
return nullptr;
}
case kGLImplementationMockGL:
case kGLImplementationStubGL:
return new GLSurfaceStub;
default:
NOTREACHED();
return nullptr;
}
}
scoped_refptr<GLSurface> CreateOffscreenGLSurfaceWithFormat(
const gfx::Size& size, GLSurfaceFormat format) {
TRACE_EVENT0("gpu", "gl::init::CreateOffscreenGLSurface");
switch (GetGLImplementation()) {
case kGLImplementationDesktopGL:
case kGLImplementationDesktopGLCoreProfile:
case kGLImplementationAppleGL:
return InitializeGLSurfaceWithFormat(
new NoOpGLSurface(size), format);
#if BUILDFLAG(USE_EGL_ON_MAC)
case kGLImplementationEGLGLES2:
case kGLImplementationSwiftShaderGL:
if (GLSurfaceEGL::IsEGLSurfacelessContextSupported() &&
size.width() == 0 && size.height() == 0) {
return InitializeGLSurfaceWithFormat(new SurfacelessEGL(size), format);
} else {
return InitializeGLSurfaceWithFormat(new PbufferGLSurfaceEGL(size),
format);
}
#endif // BUILDFLAG(USE_EGL_ON_MAC)
case kGLImplementationMockGL:
case kGLImplementationStubGL:
return new GLSurfaceStub;
default:
NOTREACHED();
return nullptr;
}
}
void SetDisabledExtensionsPlatform(const std::string& disabled_extensions) {
GLImplementation implementation = GetGLImplementation();
DCHECK_NE(kGLImplementationNone, implementation);
// TODO(zmo): Implement this if needs arise.
}
bool InitializeExtensionSettingsOneOffPlatform() {
GLImplementation implementation = GetGLImplementation();
DCHECK_NE(kGLImplementationNone, implementation);
// TODO(zmo): Implement this if needs arise.
return true;
}
} // namespace init
} // namespace gl
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