Fog.c

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/****************************************************************************************/
/*  Fog.c                                                                               */
/*                                                                                      */
/*  Author: John Pollard                                                                */
/*  Description: Fog module                                                             */
/*                                                                                      */
/*  The contents of this file are subject to the Genesis3D Public License               */
/*  Version 1.01 (the "License"); you may not use this file except in                   */
/*  compliance with the License. You may obtain a copy of the License at                */
/*  http://www.genesis3d.com                                                            */
/*                                                                                      */
/*  Software distributed under the License is distributed on an "AS IS"                 */
/*  basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See                */
/*  the License for the specific language governing rights and limitations              */
/*  under the License.                                                                  */
/*                                                                                      */
/*  The Original Code is Genesis3D, released March 25, 1999.                            */
/*Genesis3D Version 1.1 released November 15, 1999                            */
/*  Copyright (C) 1999 WildTangent, Inc. All Rights Reserved           */
/*                                                                                      */
/****************************************************************************************/
#include <Windows.h>
#include <Assert.h>

#include "Fog.h"

//================================================================================
//      geFog_Create
//================================================================================
GENESISAPI geFog *geFog_Create(SET_ATTR_CB *SetAttrCB)
{
        geFog   *Fog;

        Fog = GE_RAM_ALLOCATE_STRUCT(geFog);

        if (!Fog)
        {
                geErrorLog_Add(GE_ERR_OUT_OF_MEMORY, NULL);
                return NULL;
        }

        memset(Fog, 0, sizeof(geFog));

        if (SetAttrCB)
                Fog->SetAttrCB = SetAttrCB;
        
        return Fog;
}

//================================================================================
//      geFog_Destroy
//================================================================================
GENESISAPI void geFog_Destroy(geFog *Fog)
{
        assert(Fog);

        geRam_Free(Fog);
}

//================================================================================
//      geFog_SetAttributes
//================================================================================
GENESISAPI geBoolean geFog_SetAttributes(       geFog                   *Fog, 
                                                                                        const geVec3d   *Pos, 
                                                                                        GE_RGBA                 *Color,
                                                                                        geFloat                 LightBrightness, 
                                                                                        geFloat                 VolumeBrightness, 
                                                                                        geFloat                 VolumeRadius)
{
        Fog->Pos = *Pos;
        Fog->Color.r = Color->r*(1.0f/255.0f)*(1<<8);
        Fog->Color.g = Color->g*(1.0f/255.0f)*(1<<8);
        Fog->Color.b = Color->b*(1.0f/255.0f)*(1<<8);
        Fog->LightBrightness = LightBrightness;
        Fog->VolumeBrightness = VolumeBrightness;
        Fog->VolumeRadius = VolumeRadius;
        Fog->VolumeRadiusSquared = VolumeRadius*VolumeRadius;
        Fog->VolumeRadius2 = VolumeRadius*2;

        // Now that all is set, call the CB if it exist...
        if (Fog->SetAttrCB)
        {
                if (!Fog->SetAttrCB(Fog))
                        return GE_FALSE;
        }

        return GE_TRUE;
}

//================================================================================
//      geFog_SetUserData
//================================================================================
GENESISAPI geBoolean geFog_SetUserData(geFog *Fog, void *UserData)
{
        assert(Fog);

        Fog->UserData = UserData;

        return GE_TRUE;
}

//================================================================================
//      geFog_GetUserData
//================================================================================
GENESISAPI void *geFog_GetUserData(geFog *Fog)
{
        assert(Fog);

        return Fog->UserData;
}

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