QuadRenderer.cs

using System;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;

namespace SMLimitless.Graphics
{
    internal sealed class QuadRenderer
    {
        // http://gamedev.stackexchange.com/questions/87150/rendering-a-fullscreen-quad-is-leaving-a-one-pixel-line-on-the-left-and-top

        private VertexPositionTexture[] triangles;
        private short[] indexData = new short[] { 0, 1, 2, 2, 3, 0 };
        private GraphicsDevice gfx;

        public QuadRenderer()
        {
            gfx = GameServices.Graphics;

            // texture coordinates semantic not used or needed
            triangles = new VertexPositionTexture[]
                         {
                       new VertexPositionTexture(new Vector3(1, -1, 0),
                                                 Vector2.Zero),
                       new VertexPositionTexture(new Vector3(-1, -1, 0),
                                                 Vector2.Zero),
                       new VertexPositionTexture(new Vector3(-1, 1, 0),
                                                 Vector2.Zero),
                       new VertexPositionTexture(new Vector3(1, 1, 0),
                                                 Vector2.Zero)
                         };
        }

        public void Render(Effect effect)
        {
            foreach (EffectPass p in effect.CurrentTechnique.Passes)
                p.Apply();

            Render();
        }

        private void Render()
        {
            gfx.DrawUserIndexedPrimitives(PrimitiveType.TriangleList,
                                               triangles, 0, 4,
                                               indexData, 0, 2);
        }
    }
}