Quickstart

The quickstart guide explains how to create a .NET application with OpenTK on Tizen.

Prerequisites

Visual Studio 2017
Visual Studio Tools for Tizen
Tizen Emulator image (supports Tizen 5.0 and higher)

Create a project

To create a Tizen OpenTK app, proceed as follows:

In New project menu, select Tizen 5.0 > Tizen OpenTK App. Click OK:
The new project SampleOpenTKApp is shown in the Solution Explorer view:

If OpenTK.Tizen (3.0.2) is available in NuGet packages then you can use the OpenTK APIs.

Add OpenTK app code

The SampleOpenTKApp is generated by Tizen project template. The project draws a triangle that defines vertex, color, and shaders and registers event handles on Window for drawing this triangle.

You can add your code in SampleOpenTKApp.cs file:


                C#
                
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using System;
using OpenTK;
using OpenTK.Graphics;
using OpenTK.Graphics.ES20;
using OpenTK.Platform;
using OpenTK.Platform.Tizen;
using Tizen.Applications;

namespace SampelOpenTKApp
{
    public class OpenTKApp : TizenGameApplication
    {
        private IGameWindow mainWindow;

        private int mProgramHandle;
        private int mColorHandle;
        private int mPositionHandle;

        private float[] mVertexes;          // Vertex of triangle
        private float[] mColor;             // Color of triangle

        private string mVertexShaderSrc;    // Vertex shader
        private string mFragmentShaderSrc;  // Fragment shader

        public OpenTKApp()
        {
            mVertexes = new float[] {
                    0.0f, 0.5f, 0.0f,
                    -0.5f, -0.5f, 0.0f,
                    0.5f, -0.5f, 0.0f
                };

            mColor = new float[] { 0.0f, 0.0f, 1.0f, 1.0f };

            mVertexShaderSrc = "attribute vec4 vPosition;        \n" +
                              "void main()                       \n" +
                              "{                                 \n" +
                              "   gl_Position = vPosition;       \n" +
                              "}                                 \n";
            mFragmentShaderSrc = "precision mediump float;       \n" +
                               "uniform vec4 vColor;             \n" +
                               "void main()                      \n" +
                               "{                                \n" +
                               "  gl_FragColor = vColor;         \n" +
                               "}                                \n";
        }

        protected override void OnCreate()
        {
            // Handle when your app is created
            // At this point, GraphicsContext, Surface, Window had been created
            base.OnCreate();

            mainWindow = Window;

            mainWindow.Load += InitShader;                      // InitApp is called before the window is displayed for the first time
            mainWindow.RenderFrame += RenderTriangle;           // RenderTriangle is called for every frame
        }

        protected override void OnPause()
        {
            // Handle when your app pause
        }

        private void InitShader(object sender, EventArgs e)
        {
            // Create program and link it
            mProgramHandle = BuildProgram(mVertexShaderSrc, mFragmentShaderSrc);
            GL.LinkProgram(mProgramHandle);
            int linkStatus;
            GL.GetProgram(mProgramHandle, GetProgramParameterName.LinkStatus, out linkStatus);
            if (linkStatus == 0)
            {
                // link failed
                int infoLogLength;
                GL.GetProgram(mProgramHandle, GetProgramParameterName.InfoLogLength, out infoLogLength);
                if (infoLogLength > 0)
                {
                    String infoLog;
                    GL.GetProgramInfoLog(mProgramHandle, infoLogLength, out infoLogLength, out infoLog);
                    Console.WriteLine("GL2", "Couldn't link program: " + infoLog.ToString());
                }
                GL.DeleteProgram(mProgramHandle);
                throw new InvalidOperationException("Unable to link program");
            }
        }

        private void RenderTriangle(object ob, FrameEventArgs e)
        {
            GL.ClearColor(Color4.White);
            GL.Clear(ClearBufferMask.ColorBufferBit);

            GL.UseProgram(mProgramHandle);

            // Set vertex of triangle
            mPositionHandle = GL.GetAttribLocation(mProgramHandle, "vPosition");
            GL.EnableVertexAttribArray(mPositionHandle);
            unsafe
            {
                fixed (float* pvertices = mVertexes)
                {
                    GL.VertexAttribPointer(mPositionHandle, 3, All.Float, false, 0, new IntPtr(pvertices));
                }
            }

            // Set color of triangle
            mColorHandle = GL.GetUniformLocation(mProgramHandle, "vColor");
            GL.Uniform4(mColorHandle, 1, mColor);

            // Draw the triangle
            GL.DrawArrays(All.Triangles, 0, 3);

            Window.SwapBuffers();

            // Disable vertex array
            GL.DisableVertexAttribArray(mPositionHandle);
        }

        public static int BuildProgram(string vertexShaderSrc, string fragmentShaderSrc)
        {
            int vertexShader = LoadShader(ShaderType.VertexShader, vertexShaderSrc);
            int fragmentShader = LoadShader(ShaderType.FragmentShader, fragmentShaderSrc);
            int mProgramHandle = GL.CreateProgram();
            if (mProgramHandle == 0)
                throw new InvalidOperationException("Unable to create program");
            GL.AttachShader(mProgramHandle, vertexShader);
            GL.AttachShader(mProgramHandle, fragmentShader);
            return mProgramHandle;
        }

        static int LoadShader(ShaderType type, string source)
        {
            int shader = GL.CreateShader(type);
            if (shader == 0)
                throw new InvalidOperationException("Unable to create shader:" + type.ToString());
            int length = 0;
            GL.ShaderSource(shader, 1, new string[] { source }, (int[])null);
            GL.CompileShader(shader);
            GL.GetShader(shader, ShaderParameter.CompileStatus, out int compiled);
            if (compiled == 0)
            {
                length = 0;
                GL.GetShader(shader, ShaderParameter.InfoLogLength, out length);
                if (length > 0)
                {
                    GL.GetShaderInfoLog(shader, length, out length, out string log);
                }
                GL.DeleteShader(shader);
                throw new InvalidOperationException("Unable to compile shader of type : " + type.ToString());
            }
            return shader;
        }

        static void Main(string[] args)
        {
            using (OpenTKApp app = new OpenTKApp() { GLMajor = 2, GLMinor = 0 })
            {
                app.Run(args);
            }
        }
    }
}

OpenTKApp class is derived from TizenGameApplication class.

TizenGameApplication class creates OpenGL® ES running environment, which includes a window, OpenGL® ES context, and so on.

TizenGameApplication class inherits from Tizen.Applications.CoreUIApplication, and you can override the methods of the base class including OnCreate, OnPause, OnResume, OnAppControlReceived, and OnTerminate. For more information about these methods, see UI Applications.
InitShader is an event handler of Window.Load event. It initializes shaders of the triangle in this sample.
RenderTriangle is an event handler of Window.RenderFrame event. It draws the triangle in this sample.
app.Run() runs the main loop of the OpenTK app.

Build and run your application

To build the solution, proceed as follows:
- In the Visual Studio menu, select Build > Build Solution.
- In the Solution Explorer view, right-click the solution name and select Build.
To launch Tizen Emulator, follow these steps:
- In the Visual Studio menu, select Tools > Tizen > Tizen Emulator Manager.
- Alternatively, click Launch Tizen Emulator in the Visual Studio toolbar to launch Tizen Emulator Manager:
- In the Emulator Manager, select an emulator from the list, and click Launch:
- You must update the following emulator images to use the latest version (Tizen 5.0).
After you launch an emulator instance, you can select the target from the drop-down list to change the deployment target in the Visual Studio toolbar:

You can deploy your OpenTK app to the target, using the following:
1. Press the F5 or Ctrl+F5 keys.
2. In the Visual Studio menu, select Debug > Start Debugging or Start Without Debugging.
3. On the Visual Studio toolbar, click an emulator instance:
If the deployment is successful, then the application is launched on the target emulator.

The following are snapshots of launching this OpenTK app on mobile and TV emulators:

Figure: OpenTK app on TV emulator

Figure: OpenTK app on TV emulator

Visual Studio uses the Smart Development Bridge (SDB) to communicate with the target device or emulator.

You can also deploy your OpenTK application with SDB manually by following these steps:
1. Copy the application .tpk file from the project binary path to the SDB tool path:
  - The SampelOpenTKApp .tpk file (org.tizen.example.SampelOpenTKApp-1.0.0.tpk) is located in ProjectPath\SampelOpenTKApp\SampelOpenTKApp\bin\Debug\tizen50.
  - To locate the project path in the Solution Explorer view, right-click the solution name and click Open Folder in File Explorer.
  - SDB tool is located in c:\tizen\tools\sdb.exe.
2. Launch the Tizen SDB command prompt:
  - For Windows OS, launch the Tizen SDB command prompt (Tool > Tizen > Tizen Sdb Command Prompt).
  - For Linux, you can use the SDB command directly in your project path.
3. Install your application with the SDB command:
```
                bash
                
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sdb install org.tizen.example.SampleOpenTKApp-1.0.0.tpk
```

Dependencies
- Tizen 5.0 and Higher

Quickstart

Prerequisites

Create a project

Add OpenTK app code

Build and run your application

Related information