private void OnLoad(object sender, EventArgs e)
{
// initialize shader
_program = ProgramFactory.Create<SkyboxProgram>();
// initialize cube shape
_cube = new Cube();
_cube.UpdateBuffers();
// initialize vertex array and attributes
_vao = new VertexArray();
_vao.Bind();
_vao.BindAttribute(_program.InPosition, _cube.VertexBuffer);
_vao.BindElementBuffer(_cube.IndexBuffer);
// create cubemap texture and load all faces
for (var i = 0; i < 6; i++)
{
using (var bitmap = new Bitmap(string.Format("Data/Textures/city{0}.jpg", i)))
{
bitmap.RotateFlip(RotateFlipType.RotateNoneFlipX);
if (_skybox == null) BitmapTexture.CreateCompatible(bitmap, out _skybox, 1);
_skybox.LoadBitmap(bitmap, i);
}
}
// activate shader and bind texture to it
_program.Use();
_program.Texture.BindTexture(TextureUnit.Texture0, _skybox);
// enable seamless filtering to reduce artifacts at the edges of the cube faces
GL.Enable(EnableCap.TextureCubeMapSeamless);
// cull front faces because we are inside the cube
// this is not really necessary but removes some artifacts when the user leaves the cube
// which should be impossible for a real skybox, but in this demonstration it is possible by zooming out
GL.Enable(EnableCap.CullFace);
GL.CullFace(CullFaceMode.Front);
// set a nice clear color
GL.ClearColor(Color.MidnightBlue);
}
public ColorCube()
{
DefaultMode = PrimitiveType.Triangles;
// use default cube
using (var cube = new Cube())
{
Vertices = cube.Vertices;
Indices = cube.Indices;
}
// add color to the vertices
Colors = new List<Color>
{
Color.DarkRed,
Color.DarkRed,
Color.Gold,
Color.Gold,
Color.DarkRed,
Color.DarkRed,
Color.Gold,
Color.Gold
}.Select(_ => _.ToRgba32()).ToArray();
}