rendering-triangle.cpp
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/*
* Copyright (c) 2021 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 <dali/dali.h>
#include "generated/rendering-triangle-frag.h"
#include "generated/rendering-triangle-vert.h"
using namespace Dali;
using namespace Toolkit;
// This example shows how to draw a triangle in actor's color
//
class DrawTriangleController : public ConnectionTracker
{
public:
DrawTriangleController(Application& application)
: mApplication(application)
{
// Connect to the Application's Init signal
mApplication.InitSignal().Connect(this, &DrawTriangleController::Create);
}
~DrawTriangleController()
{
// Nothing to do here;
}
// The Init signal is received once (only) during the Application lifetime
void Create(Application& application)
{
// Get a handle to the window
Window window = application.GetWindow();
window.SetBackgroundColor(Color::WHITE);
// Step 1. Create shader
CreateTriangleShader();
// Step 2. Prepare geometry
CreateTriangleGeometry();
// Step 3. Create a renderer
CreateRenderer();
// Step 4. Create an Actor
CreateActor();
// Respond to a click anywhere on the window
window.GetRootLayer().TouchedSignal().Connect(this, &DrawTriangleController::OnTouch);
// Respond to key events
window.KeyEventSignal().Connect(this, &DrawTriangleController::OnKeyEvent);
}
bool OnTouch(Actor actor, const TouchEvent& touch)
{
// quit the application
mApplication.Quit();
return true;
}
/**
* @brief Called when any key event is received
*
* Will use this to quit the application if Back or the Escape key is received
* @param[in] event The key event information
*/
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();
}
}
}
/**
* This function creates a triangle geometry made of three vertices in order
* to draw a coloured triangle.
*/
void CreateTriangleGeometry()
{
Vector2 vertices[] = {
Vector2(-1.0f, -1.0f),
Vector2(1.0f, 1.0f),
Vector2(-1.0f, 1.0f)};
VertexBuffer vertexBuffer = VertexBuffer::New(Property::Map()
.Add("aPosition", Property::VECTOR2));
vertexBuffer.SetData(vertices, sizeof(vertices) / sizeof(Vector2));
mGeometry = Geometry::New();
mGeometry.AddVertexBuffer(vertexBuffer);
mGeometry.SetType(Geometry::TRIANGLES);
}
/**
* Creates a shader using inlined variable VERTEX_SHADER and FRAGMENT_SHADER
*
* Shaders are very basic and all they do is transforming vertices and applying actor's colour.
*/
void CreateTriangleShader()
{
mShader = Shader::New(SHADER_RENDERING_TRIANGLE_VERT, SHADER_RENDERING_TRIANGLE_FRAG);
}
/**
* Function creates renderer.
*/
void CreateRenderer()
{
mRenderer = Renderer::New(mGeometry, mShader);
}
/**
* Creates new actor and attaches renderer.
*/
void CreateActor()
{
Window window = mApplication.GetWindow();
Size size = Vector2(window.GetSize()) * 0.25f;
mActor = Actor::New();
mActor.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER);
mActor.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
mActor.SetProperty(Actor::Property::POSITION, Vector3(0.0f, 0.0f, 0.0f));
mActor.SetProperty(Actor::Property::COLOR, Color::RED);
mActor.SetProperty(Actor::Property::SIZE, Vector3(size.x, size.x, size.x));
mActor.AddRenderer(mRenderer);
window.Add(mActor);
}
private:
Application& mApplication;
Renderer mRenderer;
Shader mShader;
Geometry mGeometry;
Actor mActor;
};
int DALI_EXPORT_API main(int argc, char** argv)
{
Application application = Application::New(&argc, &argv);
DrawTriangleController test(application);
application.MainLoop();
return 0;
}