direct-rendering-example.cpp
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/*
* Copyright (c) 2022 Samsung Electronics Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <dali-toolkit/dali-toolkit.h>
#include "native-renderer.h"
using namespace Dali;
namespace
{
/**
* Helper function reading env variable as integer
*/
int GetEnvInt(const char* name, int def)
{
auto v = getenv(name);
return v ? atoi(v) : def;
}
/**
* Environment variable: DR_THREAD_ENABLE
*
* if set to 1 the Direct Rendering will use offscreen buffer and render in parallel. It is a direct
* equivalent of the EGL Image mode.
*/
const uint32_t DR_THREAD_ENABLED = GetEnvInt("DR_THREAD_ENABLED", 0);
/**
* Environment variable: EGL_ENABLED
*
* When set to 1 the native image is used for direct rendering (rendering is parallel by default).
*/
const Toolkit::GlView::BackendMode BACKEND_MODE =
Toolkit::GlView::BackendMode(GetEnvInt("EGL_ENABLED", 0));
}
/**
* RenderView encapsulates single GLView callback and its parameters.
*/
struct RenderView
{
explicit RenderView( const Dali::Window& window )
{
mWindow = window;
}
int Create(const Vector2& pos, Toolkit::GlView::BackendMode mode )
{
auto w = mWindow.GetSize().GetWidth();
auto h = mWindow.GetSize().GetHeight();
NativeRenderer::CreateInfo info{};
info.clearColor = {0, 0, 0, 0};
info.name = "DR";
info.offscreen = (mode == Toolkit::GlView::BackendMode::EGL_IMAGE_OFFSCREEN_RENDERING || DR_THREAD_ENABLED);
info.viewportX = 0;
info.viewportY = 0;
info.width = w;
info.height = h;
info.threaded = (mode != Toolkit::GlView::BackendMode::EGL_IMAGE_OFFSCREEN_RENDERING) && (DR_THREAD_ENABLED);
// Enable threaded rendering
if(info.threaded && mode == Dali::Toolkit::GlView::BackendMode::DIRECT_RENDERING)
{
mode = Dali::Toolkit::GlView::BackendMode::DIRECT_RENDERING_THREADED;
}
mRenderer = std::make_unique<NativeRenderer>(info);
mGlInitCallback = MakeCallback(mRenderer.get(), &NativeRenderer::GlViewInitCallback);
mGlRenderCallback = MakeCallback(mRenderer.get(), &NativeRenderer::GlViewRenderCallback);
mGlTerminateCallback = MakeCallback(mRenderer.get(), &NativeRenderer::GlViewTerminateCallback);
// Create GlView with callbacks
auto glView = Toolkit::GlView::New(mode, Toolkit::GlView::ColorFormat::RGBA8888); //, Toolkit::GlView::BackendMode::DIRECT_RENDERING);
glView.SetGraphicsConfig(true, false, 0, Toolkit::GlView::GraphicsApiVersion::GLES_VERSION_3_0);
glView.RegisterGlCallbacks(mGlInitCallback, mGlRenderCallback, mGlTerminateCallback);
glView.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_LEFT);
glView.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::TOP_LEFT);
// Set size on the actor (half the window size to show that glClear() and scissor test work together)
glView.SetProperty(Actor::Property::SIZE, Size(w, h));
glView.SetProperty(Actor::Property::POSITION, pos);
glView.SetRenderingMode(Toolkit::GlView::RenderingMode::CONTINUOUS);
mWindow.Add(glView);
mGlView = glView;
return 0;
}
Dali::Window mWindow;
Toolkit::GlView mGlView;
std::unique_ptr<NativeRenderer> mRenderer{};
CallbackBase* mGlInitCallback{};
CallbackBase* mGlRenderCallback{};
CallbackBase* mGlTerminateCallback{};
};
// This example oresents DirectRendering feature which allows injecting
// custom GL code into the DALi render commands stream
class DirectRenderingExampleController : public ConnectionTracker
{
public:
explicit DirectRenderingExampleController(Application& application)
: mApplication(application)
{
// Connect to the Application's Init signal
mApplication.InitSignal().Connect(this, &DirectRenderingExampleController::Create);
}
~DirectRenderingExampleController() override = default; // Nothing to do in destructor
void Create(Application& application)
{
// Get a handle to the window
Dali::Window window = application.GetWindow();
window.SetBackgroundColor(Color::WHITE);
mDRView = std::make_unique<RenderView>(window);
mDRView->Create( Vector2::ZERO, BACKEND_MODE );
}
bool OnTouch(Actor actor, const TouchEvent& touch)
{
// quit the application
mApplication.Quit();
return true;
}
void OnKeyEvent(const KeyEvent& event)
{
if(event.GetState() == KeyEvent::DOWN)
{
if(IsKey(event, Dali::DALI_KEY_ESCAPE) || IsKey(event, Dali::DALI_KEY_BACK))
{
mApplication.Quit();
}
}
}
private:
Application& mApplication;
std::unique_ptr<RenderView> mDRView;
};
int DALI_EXPORT_API main(int argc, char** argv)
{
Application application = Application::New(&argc, &argv);
DirectRenderingExampleController test(application);
application.MainLoop();
return 0;
}