root/branches/v0.8.0.0/Projects/Axiom/RenderSystems/OpenGL/GLGpuProgram.cs @ 2940

#region LGPL License

/*
Axiom Graphics Engine Library
Copyright © 2003-2011 Axiom Project Team

The overall design, and a majority of the core engine and rendering code 
contained within this library is a derivative of the open source Object Oriented 
Graphics Engine OGRE, which can be found at http://ogre.sourceforge.net.  
Many thanks to the OGRE team for maintaining such a high quality project.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library 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
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/

#endregion

#region SVN Version Information

// <file>
//     <license see="http://axiom3d.net/wiki/index.php/license.txt"/>
//     <id value="$Id$"/>
// </file>

#endregion SVN Version Information

#region Namespace Declarations

using System;

using Axiom.Core;
using Axiom.Graphics;

using Tao.OpenGl;

using System.Diagnostics;

using ResourceHandle = System.UInt64;

#endregion Namespace Declarations

namespace Axiom.RenderSystems.OpenGL
{
        /// <summary>
        ///     Specialization of vertex/fragment programs for OpenGL.
        /// </summary>
        public class GLGpuProgram : GpuProgram
        {
                #region Fields

                /// <summary>
                ///    Internal OpenGL id assigned to this program.
                /// </summary>
                protected int programId;

                /// <summary>
                ///    Type of this program (vertex or fragment).
                /// </summary>
                protected int programType;

                /// <summary>
                ///     For use internally to store temp values for passing constants, etc.
                /// </summary>
                protected float[] tempProgramFloats = new float[4];

                #endregion Fields

                #region Constructors

                /// <summary>
                ///     Constructor.
                /// </summary>
                /// <param name="name">Name of the program.</param>
                /// <param name="type">Type of program (vertex or fragment).</param>
                /// <param name="syntaxCode">Syntax code (i.e. arbvp1, etc).</param>
                internal GLGpuProgram( ResourceManager parent, string name, ResourceHandle handle, string group, bool isManual, IManualResourceLoader loader )
                        : base( parent, name, handle, group, isManual, loader ) {}

                #endregion Constructors

                #region GpuProgram Methods

                /// <summary>
                ///     Called when a program needs to be bound.
                /// </summary>
                virtual public void Bind()
                {
                        // do nothing
                }

                /// <summary>
                ///     Called when a program needs to be unbound.
                /// </summary>
                virtual public void Unbind()
                {
                        // do nothing
                }

                /// <summary>
                ///     Called to create the program from source.
                /// </summary>
                protected override void LoadFromSource()
                {
                        // do nothing
                }

                /// <summary>
                ///     Called when a program needs to bind the supplied parameters.
                /// </summary>
                /// <param name="parms"></param>
                virtual public void BindParameters( GpuProgramParameters parms )
                {
                        // do nothing
                }

                /// <summary>
                /// Bind just the pass iteration parameters
                /// </summary>
                /// <param name="parms"></param>
                virtual public void BindProgramPassIterationParameters( GpuProgramParameters parms )
                {
                        // do nothing
                }

                #endregion GpuProgram Methods

                #region Properties

                /// <summary>
                ///    Access to the internal program id.
                /// </summary>
                public int ProgramID { get { return programId; } }

                /// <summary>
                ///    Gets the program type (GL_VERTEX_PROGRAM_ARB, GL_FRAGMENT_PROGRAM_ARB, etc);
                /// </summary>
                public int GLProgramType { get { return programType; } }

                public override int SamplerCount
                {
                        get
                        {
                                //TODO: SamplerCount is not implimented
                                return 0;
                        }
                }

                #endregion Properties

                internal bool IsAttributeValid( VertexElementSemantic semantic )
                {
                        switch( semantic )
                        {
                                case VertexElementSemantic.Diffuse:
                                case VertexElementSemantic.Normal:
                                case VertexElementSemantic.Position:
                                case VertexElementSemantic.Specular:
                                case VertexElementSemantic.TexCoords:
                                default:
                                        Debug.Assert( false, "Shouldn't be calling this for normal attributes" );
                                        break;
                                case VertexElementSemantic.Binormal:
                                case VertexElementSemantic.BlendIndices:
                                case VertexElementSemantic.BlendWeights:
                                case VertexElementSemantic.Tangent:
                                        return true;
                        }
                        return false; // keeps compiler happy
                }

                internal int AttributeIndex( VertexElementSemantic semantic )
                {
                        switch( semantic )
                        {
                                case VertexElementSemantic.Diffuse:
                                case VertexElementSemantic.Normal:
                                case VertexElementSemantic.Position:
                                case VertexElementSemantic.Specular:
                                case VertexElementSemantic.TexCoords:
                                default:
                                        Debug.Assert( false, "Shouldn't be calling this for normal attributes" );
                                        break;
                                case VertexElementSemantic.Binormal:
                                        return 7;
                                case VertexElementSemantic.BlendIndices:
                                        return 1;
                                case VertexElementSemantic.BlendWeights:
                                        return 14;
                                case VertexElementSemantic.Tangent:
                                        return 15;
                        }
                        return 0; // keeps compiler happy
                }
        }
}