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using System;
using System.Runtime.InteropServices;
using SFML.Graphics;
using SFML.Window;
using SFML.System;
using OpenTK;
using OpenTK.Graphics;
using OpenTK.Graphics.OpenGL;
namespace opengl
{
static class Program
{
/// <summary>
/// The main entry point for the application.
/// </summary>
static void Main()
{
// Request a 24-bits depth buffer when creating the window
ContextSettings contextSettings = new ContextSettings();
contextSettings.DepthBits = 24;
// Create the main window
RenderWindow window = new RenderWindow(new VideoMode(800, 600), "SFML graphics with OpenGL", Styles.Default, contextSettings);
window.SetVerticalSyncEnabled(true);
// Initialize OpenTK
Toolkit.Init();
GraphicsContext context = new GraphicsContext(new ContextHandle(IntPtr.Zero), null);
// Setup event handlers
window.Closed += new EventHandler(OnClosed);
window.KeyPressed += new EventHandler<KeyEventArgs>(OnKeyPressed);
window.Resized += new EventHandler<SizeEventArgs>(OnResized);
// Create a sprite for the background
Sprite background = new Sprite(new Texture("resources/background.jpg"));
// Create a text to display on top of the OpenGL object
Text text = new Text("SFML / OpenGL demo", new Font("resources/sansation.ttf"));
text.Position = new Vector2f(250, 450);
text.Color = new Color(255, 255, 255, 170);
// Make the window the active target for OpenGL calls
window.SetActive();
// Load an OpenGL texture.
// We could directly use a SFML.Graphics.Texture as an OpenGL texture (with its Bind() member function),
// but here we want more control on it (generate mipmaps, ...) so we create a new one
int texture = 0;
using (Image image = new Image("resources/texture.jpg"))
{
GL.GenTextures(1, out texture);
GL.BindTexture(TextureTarget.Texture2D, texture);
GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, (int)image.Size.X, (int)image.Size.Y, 0, PixelFormat.Rgba, PixelType.UnsignedByte, image.Pixels);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
}
// Enable Z-buffer read and write
GL.Enable(EnableCap.DepthTest);
GL.DepthMask(true);
GL.ClearDepth(1);
// Disable lighting
GL.Disable(EnableCap.Lighting);
// Configure the viewport (the same size as the window)
GL.Viewport(0, 0, (int)window.Size.X, (int)window.Size.Y);
// Setup a perspective projection
GL.MatrixMode(MatrixMode.Projection);
GL.LoadIdentity();
float ratio = (float)(window.Size.X) / window.Size.Y;
GL.Frustum(-ratio, ratio, -1, 1, 1, 500);
// Bind the texture
GL.Enable(EnableCap.Texture2D);
GL.BindTexture(TextureTarget.Texture2D, texture);
// Define a 3D cube (6 faces made of 2 triangles composed by 3 vertices)
float[] cube = new float[]
{
// positions // texture coordinates
-20, -20, -20, 0, 0,
-20, 20, -20, 1, 0,
-20, -20, 20, 0, 1,
-20, -20, 20, 0, 1,
-20, 20, -20, 1, 0,
-20, 20, 20, 1, 1,
20, -20, -20, 0, 0,
20, 20, -20, 1, 0,
20, -20, 20, 0, 1,
20, -20, 20, 0, 1,
20, 20, -20, 1, 0,
20, 20, 20, 1, 1,
-20, -20, -20, 0, 0,
20, -20, -20, 1, 0,
-20, -20, 20, 0, 1,
-20, -20, 20, 0, 1,
20, -20, -20, 1, 0,
20, -20, 20, 1, 1,
-20, 20, -20, 0, 0,
20, 20, -20, 1, 0,
-20, 20, 20, 0, 1,
-20, 20, 20, 0, 1,
20, 20, -20, 1, 0,
20, 20, 20, 1, 1,
-20, -20, -20, 0, 0,
20, -20, -20, 1, 0,
-20, 20, -20, 0, 1,
-20, 20, -20, 0, 1,
20, -20, -20, 1, 0,
20, 20, -20, 1, 1,
-20, -20, 20, 0, 0,
20, -20, 20, 1, 0,
-20, 20, 20, 0, 1,
-20, 20, 20, 0, 1,
20, -20, 20, 1, 0,
20, 20, 20, 1, 1
};
// Enable position and texture coordinates vertex components
GL.EnableClientState(ArrayCap.VertexArray);
GL.EnableClientState(ArrayCap.TextureCoordArray);
GL.VertexPointer(3, VertexPointerType.Float, 5 * sizeof(float), Marshal.UnsafeAddrOfPinnedArrayElement(cube, 0));
GL.TexCoordPointer(2, TexCoordPointerType.Float, 5 * sizeof(float), Marshal.UnsafeAddrOfPinnedArrayElement(cube, 3));
// Disable normal and color vertex components
GL.DisableClientState(ArrayCap.NormalArray);
GL.DisableClientState(ArrayCap.ColorArray);
Clock clock = new Clock();
// Start game loop
while (window.IsOpen)
{
// Process events
window.DispatchEvents();
// Clear the window
GL.Clear(ClearBufferMask.DepthBufferBit);
// Draw background
window.PushGLStates();
window.Draw(background);
window.PopGLStates();
// Clear the depth buffer
GL.Clear(ClearBufferMask.DepthBufferBit);
// We get the position of the mouse cursor, so that we can move the box accordingly
float x = Mouse.GetPosition(window).X * 200.0F / window.Size.X - 100.0F;
float y = -Mouse.GetPosition(window).Y * 200.0F / window.Size.Y + 100.0F;
// Apply some transformations
GL.MatrixMode(MatrixMode.Modelview);
GL.LoadIdentity();
GL.Translate(x, y, -100.0F);
GL.Rotate(clock.ElapsedTime.AsSeconds() * 50, 1.0F, 0.0F, 0.0F);
GL.Rotate(clock.ElapsedTime.AsSeconds() * 30, 0.0F, 1.0F, 0.0F);
GL.Rotate(clock.ElapsedTime.AsSeconds() * 90, 0.0F, 0.0F, 1.0F);
// Draw the cube
GL.DrawArrays(OpenTK.Graphics.OpenGL.PrimitiveType.Triangles, 0, 36);
// Draw some text on top of our OpenGL object
window.PushGLStates();
window.Draw(text);
window.PopGLStates();
// Finally, display the rendered frame on screen
window.Display();
}
// Don't forget to destroy our texture
GL.DeleteTextures(1, ref texture);
}
/// <summary>
/// Function called when the window is closed
/// </summary>
static void OnClosed(object sender, EventArgs e)
{
RenderWindow window = (RenderWindow)sender;
window.Close();
}
/// <summary>
/// Function called when a key is pressed
/// </summary>
static void OnKeyPressed(object sender, KeyEventArgs e)
{
RenderWindow window = (RenderWindow)sender;
if (e.Code == Keyboard.Key.Escape)
window.Close();
}
/// <summary>
/// Function called when the window is resized
/// </summary>
static void OnResized(object sender, SizeEventArgs e)
{
GL.Viewport(0, 0, (int)e.Width, (int)e.Height);
}
}
}