/// <summary>SkyHost constructor. Note: constructor only runs for clients, not server as it only uses static methods in SkyHost.</summary>
internal SkyHost()
{
SkyTopCurrentColor = SkyTopBrightestColor;
SkyBottomCurrentColor = SkyBottomBrightestColor;
var fa = SkyBottomCurrentColor.ToFloatArray();
GL.ClearColor(fa[0], fa[1], fa[2], 1);
}
public void Update(FrameEventArgs e)
{
var brightnessPercent = UpdateSun(e);
if (brightnessPercent > 1)
{
brightnessPercent = 1; //cant multiply by any more than 100%, sky is at 100% or greater for a large portion of the daytime where the sky gradient colors remain the same
}
//need to update following values on every update in case the sun position has been altered either by an admin or server sync
SkyTopCurrentColor = SkyTopBrightestColor * brightnessPercent;
SkyBottomCurrentColor = SkyBottomBrightestColor * brightnessPercent;
var fa = SkyBottomCurrentColor.ToFloatArray(); //need a float array to pass to ClearColor and Fog
GL.ClearColor(fa[0], fa[1], fa[2], 1);
GL.Fog(FogParameter.FogColor, Game.Player.EyesUnderWater ? (WorldHost.FogColorUnderWater * brightnessPercent).ToFloatArray() : fa);
}
/// <summary>
/// Push the modelview matrix, load the identity and load a new matrix at the origin and looking the same way as the player.
/// After rendering the skybox, enable blending and render the sun and moon.
/// </summary>
/// <remarks>
/// A future optimization would be to draw all opaque world objects first and then render the skybox followed by transparent world objects.
/// This prevents the pixel shader from drawing many of the same pixels twice. However is more complicated for a small benefit.
/// </remarks>
public void Render(FrameEventArgs e)
{
GL.PushMatrix();
GL.LoadIdentity();
var sky = Matrix4d.LookAt(0, 0, 0, (float)Math.Cos(Game.Player.Coords.Direction) * (float)Math.Cos(Game.Player.Coords.Pitch), (float)Math.Sin(Game.Player.Coords.Pitch), (float)Math.Sin(Game.Player.Coords.Direction) * (float)Math.Cos(Game.Player.Coords.Pitch), 0, 1, 0);
GL.LoadMatrix(ref sky);
GL.PushAttrib(AttribMask.EnableBit);
GL.Disable(EnableCap.DepthTest);
GL.Disable(EnableCap.Texture2D);
const float TOP = 0.3f;
const float BOTTOM = 0.04f; //make bottom color at the horizon so we can always set the fog color to the same and have nice blending
const float SIDE = 0.5f;
const float SIDE_OUT = SIDE + SIDE / 2; //where the sides stick out to create 8 faces
//draw skybox as a triangle fan with a center top point and 8 bottom points, cuts down on the noticeable gradient corners
//drawn clockwise because we are "inside" the skybox, not in a display list because the colors change on every render (could make a dynamic vbo)
GL.Begin(BeginMode.TriangleFan);
GL.Color3(SkyTopCurrentColor.ToFloatArray());
GL.Vertex3(0, TOP, 0); //center top point
GL.Color3(SkyBottomCurrentColor.ToFloatArray());
GL.Vertex3(SIDE, BOTTOM, SIDE);
GL.Vertex3(0, BOTTOM, SIDE_OUT);
GL.Vertex3(-SIDE, BOTTOM, SIDE);
GL.Vertex3(-SIDE_OUT, BOTTOM, 0);
GL.Vertex3(-SIDE, BOTTOM, -SIDE);
GL.Vertex3(0, BOTTOM, -SIDE_OUT);
GL.Vertex3(SIDE, BOTTOM, -SIDE);
GL.Vertex3(SIDE_OUT, BOTTOM, 0);
GL.Vertex3(SIDE, BOTTOM, SIDE);
GL.End();
GlHelper.ResetColor();
//render sun/moon
GL.Enable(EnableCap.Texture2D);
GL.Enable(EnableCap.Blend);
DisplayList.RenderDisplayList(DisplayList.SunId, SunPosition.X, SunPosition.Y, 0, Textures.EnvironmentTextureType.Sun);
DisplayList.RenderDisplayList(DisplayList.MoonId, -SunPosition.X, -SunPosition.Y, 0, Textures.EnvironmentTextureType.Moon);
GL.PopAttrib();
GL.PopMatrix();
}
