D:/guillaume/guillara/3D/DXGfx/Backup/DXGfxLib/Billboard.cs

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//BSD License  
//DXGfx® - http://www.eteractions.com
//Copyright (c) 2005
//by Guillaume Randon
//Permission is hereby granted, free of charge, to any person obtaining a copy of this software
//and associated documentation files (the "Software"), to deal in the Software without restriction,
//including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
//and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
//subject to the following conditions:
//The above copyright notice and this permission notice shall be included in all copies or substantial
//portions of the Software.
//THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
//INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE 
//AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
//DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
//OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.DirectX;
using Microsoft.DirectX.Direct3D;
using Microsoft.Samples.DirectX.UtilityToolkit;
using System.Drawing;

namespace DXGfxLib
{
    internal class Billboard : TexturedPlane, IComparable
    {
        public static Matrix currentFrameBillboardRot;
        public static double lastRotUpdate = -1;

        public static StateBlock billboardRenderState = null;

        public double distToNearPlane = 1000.0f;

        public Billboard(Device d3ddevice, int width, int heigth, int numVertX, int numVertZ, string texturefile)
            :
            base(d3ddevice, width, heigth, numVertX, numVertZ, texturefile)
        {
        }

        public Billboard(Device d3ddevice, Billboard srcBillBoard)
            : base(d3ddevice, srcBillBoard.width, srcBillBoard.heigth, srcBillBoard.numVertX, srcBillBoard.numVertZ, srcBillBoard.textureFileName)
        {
        }

        public override int CompareTo(Object obj)
        {
            Billboard otherBillboard = obj as Billboard;

            int retVal = 1;

            if (obj != null)
            {
                if (distToNearPlane > otherBillboard.distToNearPlane)
                {
                    retVal = -1;
                }
            }
            return retVal;
        }

        public override void Update(Frustrum frustrum, double appTime, float elapsedTime)
        {
            if (lastRotUpdate != appTime)
            {
                Matrix billboard = frustrum.matView;
                billboard.M41 = 0.0f;
                billboard.M42 = 0.0f;
                billboard.M43 = 0.0f;
                Quaternion q = Quaternion.RotationMatrix(billboard);
                q.Invert();
                q.X = 0.0f;
                q.Z = 0.0f;
                q.Normalize();


                currentFrameBillboardRot = Matrix.RotationQuaternion(q);
                lastRotUpdate = appTime;
            }

            worldMat.M11 = currentFrameBillboardRot.M11;
            worldMat.M12 = currentFrameBillboardRot.M12;
            worldMat.M13 = currentFrameBillboardRot.M13;

            worldMat.M21 = currentFrameBillboardRot.M21;
            worldMat.M22 = currentFrameBillboardRot.M22;
            worldMat.M23 = currentFrameBillboardRot.M23;

            worldMat.M31 = currentFrameBillboardRot.M31;
            worldMat.M32 = currentFrameBillboardRot.M32;
            worldMat.M33 = currentFrameBillboardRot.M33;
            distToNearPlane = MathUtil.SignedDistance(frustrum.NearPlane, Position);

            base.Update(frustrum, appTime, elapsedTime);
        }

        public override void Draw(Device device)
        {
            if (billboardRenderState == null)
            {
                device.Material = material;


                device.RenderState.AlphaBlendEnable = true;

                device.RenderState.SourceBlend = Blend.SourceAlpha;
                device.RenderState.DestinationBlend = Blend.InvSourceAlpha;

                device.TextureState[0].AlphaArgument1 = TextureArgument.TextureColor;
                device.TextureState[0].AlphaOperation = TextureOperation.SelectArg1;
                device.TextureState[0].ColorArgument1 = TextureArgument.TextureColor;
                device.TextureState[0].ColorArgument2 = TextureArgument.Diffuse;
                device.TextureState[0].ColorOperation = TextureOperation.Modulate;

                billboardRenderState = new StateBlock(device, StateBlockType.All);
                billboardRenderState.Capture();
            }

            device.SetTexture(0, texture);
            
            device.SetTransform(TransformType.World, worldMat);


            originalMesh.DrawSubset(0);
        }
    }
}

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