Model_sprite.cpp

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

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"


/*

A simple sprite model that always faces the view axis.

*/

static const char *sprite_SnapshotName = "_sprite_Snapshot_";

/*
===============
idRenderModelBeam::IsDynamicModel
===============
*/
dynamicModel_t idRenderModelSprite::IsDynamicModel() const {
        return DM_CONTINUOUS;
}

/*
===============
idRenderModelBeam::IsLoaded
===============
*/
bool idRenderModelSprite::IsLoaded() const {
        return true;
}

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

        if ( cachedModel && !r_useCachedDynamicModels.GetBool() ) {
                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(), sprite_SnapshotName ) == 0 );

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

        } else {

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

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

                tri->verts[ 0 ].Clear();
                tri->verts[ 0 ].normal.Set( 1.0f, 0.0f, 0.0f );
                tri->verts[ 0 ].tangents[0].Set( 0.0f, 1.0f, 0.0f );
                tri->verts[ 0 ].tangents[1].Set( 0.0f, 0.0f, 1.0f );
                tri->verts[ 0 ].st[ 0 ] = 0.0f;
                tri->verts[ 0 ].st[ 1 ] = 0.0f;

                tri->verts[ 1 ].Clear();
                tri->verts[ 1 ].normal.Set( 1.0f, 0.0f, 0.0f );
                tri->verts[ 1 ].tangents[0].Set( 0.0f, 1.0f, 0.0f );
                tri->verts[ 1 ].tangents[1].Set( 0.0f, 0.0f, 1.0f );
                tri->verts[ 1 ].st[ 0 ] = 1.0f;
                tri->verts[ 1 ].st[ 1 ] = 0.0f;

                tri->verts[ 2 ].Clear();
                tri->verts[ 2 ].normal.Set( 1.0f, 0.0f, 0.0f );
                tri->verts[ 2 ].tangents[0].Set( 0.0f, 1.0f, 0.0f );
                tri->verts[ 2 ].tangents[1].Set( 0.0f, 0.0f, 1.0f );
                tri->verts[ 2 ].st[ 0 ] = 1.0f;
                tri->verts[ 2 ].st[ 1 ] = 1.0f;

                tri->verts[ 3 ].Clear();
                tri->verts[ 3 ].normal.Set( 1.0f, 0.0f, 0.0f );
                tri->verts[ 3 ].tangents[0].Set( 0.0f, 1.0f, 0.0f );
                tri->verts[ 3 ].tangents[1].Set( 0.0f, 0.0f, 1.0f );
                tri->verts[ 3 ].st[ 0 ] = 0.0f;
                tri->verts[ 3 ].st[ 1 ] = 1.0f;

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

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

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

        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 );

        idVec3 right    = idVec3( 0.0f, renderEntity->shaderParms[ SHADERPARM_SPRITE_WIDTH ] * 0.5f, 0.0f );
        idVec3 up               = idVec3( 0.0f, 0.0f, renderEntity->shaderParms[ SHADERPARM_SPRITE_HEIGHT ] * 0.5f );

        tri->verts[ 0 ].xyz = up + right;
        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 = up - right;
        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 = - right - up;
        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 = right - up;
        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;
}

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

        b.Zero();
        if ( renderEntity == NULL ) {
                b.ExpandSelf( 8.0f );
        } else {
                b.ExpandSelf( Max( renderEntity->shaderParms[ SHADERPARM_SPRITE_WIDTH ], renderEntity->shaderParms[ SHADERPARM_SPRITE_HEIGHT ] ) * 0.5f );
        }
        return b;
}