using System;
using System.Drawing;
using System.Windows.Forms;
using Microsoft.DirectX;
using Microsoft.DirectX.Direct3D;

class Initialize
{
    Form target;
    Device device;
    PresentParameters pp;
    VertexBuffer vb;

    public void initializeGraphics(Form window)
    {
        this.target = window;
        this.target.ClientSize = new Size(800, 600);
        this.target.StartPosition = FormStartPosition.CenterScreen;

        setupDevice();
    }

    public void setupDevice()
    {
        pp = new PresentParameters();
        pp.Windowed = true;
        pp.SwapEffect = SwapEffect.Discard;

        device = new Device(0, DeviceType.Hardware, target, CreateFlags.HardwareVertexProcessing, pp);
        device.RenderState.Lighting = false;
        device.RenderState.CullMode = Cull.None;
        device.RenderState.AlphaBlendEnable = true;

        Vector3 cameraPosition = new Vector3(0, 0, -2);
        Vector3 cameraTarget = new Vector3(0, 0, 0);
        Vector3 cameraUp = new Vector3(0, 1, 0);

        device.Transform.View = Matrix.LookAtLH(cameraPosition, cameraTarget, cameraUp);
        device.Transform.Projection = Matrix.OrthoLH(800, 600, -2.0f, 2.0f);

        fillBuffer();
    }

    public void fillBuffer()
    {
        CustomVertex.PositionColored[] verts = new CustomVertex.PositionColored[3];
        verts[0] = new CustomVertex.PositionColored(0f, 1.0f, 0, Color.Blue.ToArgb());
        verts[1] = new CustomVertex.PositionColored(-1.0f, -1.0f, 0, Color.White.ToArgb());
        verts[2] = new CustomVertex.PositionColored(1.0f, -1.0f, 0, Color.Orange.ToArgb());

        vb = new VertexBuffer(typeof(CustomVertex.PositionColored), verts.Length, device, 0, CustomVertex.PositionColored.Format, Pool.Default);

        GraphicsStream stream = vb.Lock(0, 0, LockFlags.None);
        stream.Write(verts);
        vb.Unlock();
    }

    public void Render()
    {
        device.Clear(ClearFlags.Target, Color.Black, 1.0F, 0);
        device.BeginScene();

        device.SetStreamSource(0, vb, 0);
        device.VertexFormat = CustomVertex.PositionColored.Format;
        device.DrawPrimitives(PrimitiveType.TriangleFan, 0, 1);

        device.EndScene();
        device.Present();
    }
}