/SolarSystem.Wpf/Skybox.cs

using SharpGL;

using SharpGL.SceneGraph.Assets;

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;



namespace SolarSystem.Wpf

{

    public class Skybox

    {

        private Double height;

        private Double length;

        private Double width;

        private Texture[] textures;



        public Skybox(Double height, Double length, Double width)

        {

            this.height = height;

            this.length = length;

            this.width = width;

            this.textures = new Texture[6];

        }



        public void LoadTextures(OpenGL gl)

        {

            textures[0] = new Texture();

            textures[0].Create(gl, @"Textures\skybox_front.jpg");



            textures[1] = new Texture();

            textures[1].Create(gl, @"Textures\skybox_back.jpg");



            textures[2] = new Texture();

            textures[2].Create(gl, @"Textures\skybox_left.jpg");



            textures[3] = new Texture();

            textures[3].Create(gl, @"Textures\skybox_right.jpg");



            textures[4] = new Texture();

            textures[4].Create(gl, @"Textures\skybox_top.jpg");



            textures[5] = new Texture();

            textures[5].Create(gl, @"Textures\skybox_bottom.jpg");

        }



        public void Render(OpenGL gl, Double centerX, Double centerY, Double centerZ)

        {

            var x = centerX - width / 2;

            var y = centerY - height / 2;

            var z = centerZ - length / 2;



            // Front 

            textures[0].Bind(gl);

            gl.Begin(OpenGL.GL_QUADS);

            gl.TexCoord(0.0f, 0.0f); gl.Vertex(x, y, z + length);

            gl.TexCoord(0.0f, 1.5f); gl.Vertex(x, y + height, z + length);

            gl.TexCoord(1.5f, 1.5f); gl.Vertex(x + width, y + height, z + length);

            gl.TexCoord(1.5f, 0.0f); gl.Vertex(x + width, y, z + length);

            gl.End();



            // Back

            textures[1].Bind(gl);

            gl.Begin(OpenGL.GL_QUADS);

            gl.TexCoord(1.5f, 0.0f); gl.Vertex(x + width, y, z);

            gl.TexCoord(1.5f, 1.5f); gl.Vertex(x + width, y + height, z);

            gl.TexCoord(0.0f, 1.5f); gl.Vertex(x, y + height, z);

            gl.TexCoord(0.0f, 0.0f); gl.Vertex(x, y, z);

            gl.End();



            // Left

            textures[2].Bind(gl);

            gl.Begin(OpenGL.GL_QUADS);

            gl.TexCoord(0.0f, 1.5f); gl.Vertex(x, y + height, z);

            gl.TexCoord(1.5f, 1.5f); gl.Vertex(x, y + height, z + length);

            gl.TexCoord(1.5f, 0.0f); gl.Vertex(x, y, z + length);

            gl.TexCoord(0.0f, 0.0f); gl.Vertex(x, y, z);

            gl.End();



            // Right

            textures[3].Bind(gl);

            gl.Begin(OpenGL.GL_QUADS);

            gl.TexCoord(0.0f, 0.0f); gl.Vertex(x + width, y, z);

            gl.TexCoord(1.5f, 0.0f); gl.Vertex(x + width, y, z + length);

            gl.TexCoord(1.5f, 1.5f); gl.Vertex(x + width, y + height, z + length);

            gl.TexCoord(0.0f, 1.5f); gl.Vertex(x + width, y + height, z);

            gl.End();



            // Up

            textures[4].Bind(gl);

            gl.Begin(OpenGL.GL_QUADS);

            gl.TexCoord(0.0f, 0.0f); gl.Vertex(x + width, y + height, z);

            gl.TexCoord(1.5f, 0.0f); gl.Vertex(x + width, y + height, z + length);

            gl.TexCoord(1.5f, 1.5f); gl.Vertex(x, y + height, z + length);

            gl.TexCoord(0.0f, 1.5f); gl.Vertex(x, y + height, z);

            gl.End();



            //// Down

            textures[5].Bind(gl);

            gl.Begin(OpenGL.GL_QUADS);

            gl.TexCoord(0.0f, 0.0f); gl.Vertex(x, y, z);

            gl.TexCoord(1.5f, 0.0f); gl.Vertex(x, y, z + length);

            gl.TexCoord(1.5f, 1.5f); gl.Vertex(x + width, y, z + length);

            gl.TexCoord(0.0f, 1.5f); gl.Vertex(x + width, y, z);

            gl.End();



            gl.BindTexture(OpenGL.GL_TEXTURE_2D, 0);

        }

    }

}