#region ================== Copyright (c) 2007 Pascal vd Heiden

/*
 * Copyright (c) 2007 Pascal vd Heiden, www.codeimp.com
 * This program is released under GNU General Public License
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 */

#endregion

#region ================== Namespaces

using System;
using SlimDX.Direct3D9;
using SlimDX;

#endregion

namespace CodeImp.DoomBuilder.Rendering
{
	internal sealed class World3DShader : D3DShader
	{
		#region ================== Variables

		// Property handlers
		private readonly EffectHandle texture1;
		private readonly EffectHandle worldviewproj;
		private readonly EffectHandle minfiltersettings;
		private readonly EffectHandle magfiltersettings;
		private readonly EffectHandle mipfiltersettings;
		private readonly EffectHandle maxanisotropysetting;
		private readonly EffectHandle highlightcolor;

		//mxd
		private readonly EffectHandle vertexColorHadle;
		private readonly EffectHandle lightPositionAndRadiusHandle; //lights
		private readonly EffectHandle lightColorHandle;
		private readonly EffectHandle world;
		private readonly EffectHandle camPosHandle; //used for fog rendering
		
		#endregion

		#region ================== Properties

		private Matrix wwp;
		public Matrix WorldViewProj
		{
			set
			{
				if(wwp != value)
				{
					effect.SetValue(worldviewproj, value);
					wwp = value;
					settingschanged = true;
				}
			}
		}

		public BaseTexture Texture1 { set { effect.SetTexture(texture1, value); settingschanged = true; } }

		//mxd
		private Color4 vertexcolor;
		public Color4 VertexColor
		{
			set 
			{
				if(vertexcolor != value)
				{
					effect.SetValue(vertexColorHadle, value);
					vertexcolor = value;
					settingschanged = true; 
				}
			} 
		}
		
		//lights
		private Color4 lightcolor;
		public Color4 LightColor
		{
			set
			{
				if(lightcolor != value)
				{
					effect.SetValue(lightColorHandle, value);
					lightcolor = value;
					settingschanged = true;
				}
			}
		}

		private Vector4 lightpos;
		public Vector4 LightPositionAndRadius
		{
			set
			{
				if(lightpos != value)
				{
					effect.SetValue(lightPositionAndRadiusHandle, value);
					lightpos = value;
					settingschanged = true;
				} 
			}
		}
		
		//fog
		private Vector4 campos;
		public Vector4 CameraPosition
		{
			set
			{
				if(campos != value)
				{
					effect.SetValue(camPosHandle, value);
					campos = value;
					settingschanged = true;
				}
			}
		}

		private Matrix mworld;
		public Matrix World
		{
			set
			{
				if(mworld != value)
				{
					effect.SetValue(world, value);
					mworld = value;
					settingschanged = true;
				}
			}
		}

		//mxd. This sets the highlight color
		private Color4 hicolor;
		public Color4 HighlightColor
		{
			set
			{
				if(hicolor != value)
				{
					effect.SetValue(highlightcolor, value);
					hicolor = value;
					settingschanged = true;
				}
			}
		}

		#endregion

		#region ================== Constructor / Disposer

		// Constructor
		public World3DShader(ShaderManager manager) : base(manager)
		{
			// Load effect from file
			effect = LoadEffect("world3d.fx");

			// Get the property handlers from effect
			if(effect != null)
			{
				worldviewproj = effect.GetParameter(null, "worldviewproj");
				texture1 = effect.GetParameter(null, "texture1");
				minfiltersettings = effect.GetParameter(null, "minfiltersettings");
				magfiltersettings = effect.GetParameter(null, "magfiltersettings");
				mipfiltersettings = effect.GetParameter(null, "mipfiltersettings");
				highlightcolor = effect.GetParameter(null, "highlightcolor");
				maxanisotropysetting = effect.GetParameter(null, "maxanisotropysetting");

				//mxd
				vertexColorHadle = effect.GetParameter(null, "vertexColor");
				//lights
				lightPositionAndRadiusHandle = effect.GetParameter(null, "lightPosAndRadius");
				lightColorHandle = effect.GetParameter(null, "lightColor");
				//fog
				camPosHandle = effect.GetParameter(null, "campos");

				world = effect.GetParameter(null, "world");
			}

			// Initialize world vertex declaration
			VertexElement[] ve = {
				new VertexElement(0, 0, DeclarationType.Float3, DeclarationMethod.Default, DeclarationUsage.Position, 0),
				new VertexElement(0, 12, DeclarationType.Color, DeclarationMethod.Default, DeclarationUsage.Color, 0),
				new VertexElement(0, 16, DeclarationType.Float2, DeclarationMethod.Default, DeclarationUsage.TextureCoordinate, 0),
				new VertexElement(0, 24, DeclarationType.Float3, DeclarationMethod.Default, DeclarationUsage.Normal, 0), //mxd
				VertexElement.VertexDeclarationEnd
			};

			vertexdecl = new VertexDeclaration(General.Map.Graphics.Device, ve);

			// We have no destructor
			GC.SuppressFinalize(this);
		}

		// Disposer
		public override void Dispose()
		{
			// Not already disposed?
			if(!isdisposed)
			{
				// Clean up
				if(texture1 != null) texture1.Dispose();
				if(worldviewproj != null) worldviewproj.Dispose();
				if(minfiltersettings != null) minfiltersettings.Dispose();
				if(magfiltersettings != null) magfiltersettings.Dispose();
				if(mipfiltersettings != null) mipfiltersettings.Dispose();
				if(highlightcolor != null) highlightcolor.Dispose();
				if(maxanisotropysetting != null) maxanisotropysetting.Dispose();

				//mxd
				if(vertexColorHadle != null) vertexColorHadle.Dispose();
				if(lightColorHandle != null) lightColorHandle.Dispose();
				if(lightPositionAndRadiusHandle != null) lightPositionAndRadiusHandle.Dispose();
				if(camPosHandle != null) camPosHandle.Dispose();
				if(world != null) world.Dispose();

				// Done
				base.Dispose();
			}
		}

		#endregion

		#region ================== Methods

		// This sets the constant settings
		public void SetConstants(bool bilinear, float maxanisotropy)
		{
			//mxd. It's still nice to have anisotropic filtering when texture filtering is disabled
			TextureFilter magminfilter = (bilinear ? TextureFilter.Linear : TextureFilter.Point);
			effect.SetValue(magfiltersettings, magminfilter);
			effect.SetValue(minfiltersettings, (maxanisotropy > 1.0f ? TextureFilter.Anisotropic : magminfilter));
			effect.SetValue(mipfiltersettings, TextureFilter.Linear);
			effect.SetValue(maxanisotropysetting, maxanisotropy);

			settingschanged = true; //mxd
		}
		
		#endregion
	}
}