Model_beam.cpp

Go to the documentation of this file.

/*
===========================================================================

Doom 3 GPL Source Code
Copyright (C) 1999-2011 id Software LLC, a ZeniMax Media company. 

This file is part of the Doom 3 GPL Source Code (?Doom 3 Source Code?).  

Doom 3 Source Code is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Doom 3 Source Code 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.

You should have received a copy of the GNU General Public License
along with Doom 3 Source Code.  If not, see <http://www.gnu.org/licenses/>.

In addition, the Doom 3 Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 Source Code.  If not, please request a copy in writing from id Software at the address below.

If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.

===========================================================================
*/

#include "../idlib/precompiled.h"
#pragma hdrstop

#include "tr_local.h"
#include "Model_local.h"

/*

This is a simple dynamic model that just creates a stretched quad between
two points that faces the view, like a dynamic deform tube.

*/

static const char *beam_SnapshotName = "_beam_Snapshot_";

/*
===============
idRenderModelBeam::IsDynamicModel
===============
*/
dynamicModel_t idRenderModelBeam::IsDynamicModel() const {
        return DM_CONTINUOUS;   // regenerate for every view
}

/*
===============
idRenderModelBeam::IsLoaded
===============
*/
bool idRenderModelBeam::IsLoaded() const {
        return true;    // don't ever need to load
}

/*
===============
idRenderModelBeam::InstantiateDynamicModel
===============
*/
idRenderModel *idRenderModelBeam::InstantiateDynamicModel( const struct renderEntity_s *renderEntity, const struct viewDef_s *viewDef, idRenderModel *cachedModel ) {
        idRenderModelStatic *staticModel;
        srfTriangles_t *tri;
        modelSurface_t surf;

        if ( cachedModel ) {
                delete cachedModel;
                cachedModel = NULL;
        }

        if ( renderEntity == NULL || viewDef == NULL ) {
                delete cachedModel;
                return NULL;
        }

        if ( cachedModel != NULL ) {

                assert( dynamic_cast<idRenderModelStatic *>( cachedModel ) != NULL );
                assert( idStr::Icmp( cachedModel->Name(), beam_SnapshotName ) == 0 );

                staticModel = static_cast<idRenderModelStatic *>( cachedModel );
                surf = *staticModel->Surface( 0 );
                tri = surf.geometry;

        } else {

                staticModel = new idRenderModelStatic;
                staticModel->InitEmpty( beam_SnapshotName );

                tri = R_AllocStaticTriSurf();
                R_AllocStaticTriSurfVerts( tri, 4 );
                R_AllocStaticTriSurfIndexes( tri, 6 );

                tri->verts[0].Clear();
                tri->verts[0].st[0] = 0;
                tri->verts[0].st[1] = 0;

                tri->verts[1].Clear();
                tri->verts[1].st[0] = 0;
                tri->verts[1].st[1] = 1;

                tri->verts[2].Clear();
                tri->verts[2].st[0] = 1;
                tri->verts[2].st[1] = 0;

                tri->verts[3].Clear();
                tri->verts[3].st[0] = 1;
                tri->verts[3].st[1] = 1;

                tri->indexes[0] = 0;
                tri->indexes[1] = 2;
                tri->indexes[2] = 1;
                tri->indexes[3] = 2;
                tri->indexes[4] = 3;
                tri->indexes[5] = 1;

                tri->numVerts = 4;
                tri->numIndexes = 6;

                surf.geometry = tri;
                surf.id = 0;
                surf.shader = tr.defaultMaterial;
                staticModel->AddSurface( surf );
        }

        idVec3  target = *reinterpret_cast<const idVec3 *>( &renderEntity->shaderParms[SHADERPARM_BEAM_END_X] );

        // we need the view direction to project the minor axis of the tube
        // as the view changes
        idVec3  localView, localTarget;
        float   modelMatrix[16];
        R_AxisToModelMatrix( renderEntity->axis, renderEntity->origin, modelMatrix );
        R_GlobalPointToLocal( modelMatrix, viewDef->renderView.vieworg, localView ); 
        R_GlobalPointToLocal( modelMatrix, target, localTarget ); 

        idVec3  major = localTarget;
        idVec3  minor;

        idVec3  mid = 0.5f * localTarget;
        idVec3  dir = mid - localView;
        minor.Cross( major, dir );
        minor.Normalize();
        if ( renderEntity->shaderParms[SHADERPARM_BEAM_WIDTH] != 0.0f ) {
                minor *= renderEntity->shaderParms[SHADERPARM_BEAM_WIDTH] * 0.5f;
        }

        int red         = idMath::FtoiFast( renderEntity->shaderParms[SHADERPARM_RED] * 255.0f );
        int green       = idMath::FtoiFast( renderEntity->shaderParms[SHADERPARM_GREEN] * 255.0f );
        int blue        = idMath::FtoiFast( renderEntity->shaderParms[SHADERPARM_BLUE] * 255.0f );
        int alpha       = idMath::FtoiFast( renderEntity->shaderParms[SHADERPARM_ALPHA] * 255.0f );

        tri->verts[0].xyz = minor;
        tri->verts[0].color[0] = red;
        tri->verts[0].color[1] = green;
        tri->verts[0].color[2] = blue;
        tri->verts[0].color[3] = alpha;

        tri->verts[1].xyz = -minor;
        tri->verts[1].color[0] = red;
        tri->verts[1].color[1] = green;
        tri->verts[1].color[2] = blue;
        tri->verts[1].color[3] = alpha;

        tri->verts[2].xyz = localTarget + minor;
        tri->verts[2].color[0] = red;
        tri->verts[2].color[1] = green;
        tri->verts[2].color[2] = blue;
        tri->verts[2].color[3] = alpha;

        tri->verts[3].xyz = localTarget - minor;
        tri->verts[3].color[0] = red;
        tri->verts[3].color[1] = green;
        tri->verts[3].color[2] = blue;
        tri->verts[3].color[3] = alpha;

        R_BoundTriSurf( tri );

        staticModel->bounds = tri->bounds;

        return staticModel;
}

/*
===============
idRenderModelBeam::Bounds
===============
*/
idBounds idRenderModelBeam::Bounds( const struct renderEntity_s *renderEntity ) const {
        idBounds        b;

        b.Zero();
        if ( !renderEntity ) {
                b.ExpandSelf( 8.0f );
        } else {
                idVec3  target = *reinterpret_cast<const idVec3 *>( &renderEntity->shaderParms[SHADERPARM_BEAM_END_X] );
                idVec3  localTarget;
                float   modelMatrix[16];
                R_AxisToModelMatrix( renderEntity->axis, renderEntity->origin, modelMatrix );
                R_GlobalPointToLocal( modelMatrix, target, localTarget ); 

                b.AddPoint( localTarget );
                if ( renderEntity->shaderParms[SHADERPARM_BEAM_WIDTH] != 0.0f ) {
                        b.ExpandSelf( renderEntity->shaderParms[SHADERPARM_BEAM_WIDTH] * 0.5f );
                }
        }
        return b;
}