C++ StateSet::setTextureAttribute方法代码示例

Node *makeTrees( void )
{
    Group *group = new Group;
    int i;

    getDatabaseCenterRadius( dbcenter, &dbradius );
    struct _tree  *t;

    Texture2D *tex = new Texture2D;
    tex->setImage(osgDB::readImageFile("Images/tree0.rgba"));

    StateSet *dstate = new StateSet;
    
    dstate->setTextureAttributeAndModes(0, tex, StateAttribute::ON );
    dstate->setTextureAttribute(0, new TexEnv );

    dstate->setAttributeAndModes( new BlendFunc, StateAttribute::ON );

    AlphaFunc* alphaFunc = new AlphaFunc;
    alphaFunc->setFunction(AlphaFunc::GEQUAL,0.05f);
    dstate->setAttributeAndModes( alphaFunc, StateAttribute::ON );

    dstate->setMode( GL_LIGHTING, StateAttribute::OFF );
    
    dstate->setRenderingHint( StateSet::TRANSPARENT_BIN );

    int tt[] = { 15, 30, 45, 58, 72, 75, 93, 96, 105, -1 };
    int *ttp = tt;

    i = 0;
    while( i < 105 )
    {
        ttx = trees[i].x;
        tty = trees[i].y;
        qsort( &trees[i], 105 - i, sizeof( _tree ), ct );

        i += *ttp;
        ttp++;
    }

    t = trees;
    i = 0;
    ttp = tt;
    while( *ttp != -1 )
    {
        Billboard *bb = new Billboard;
        //int starti = i;

        for( ; i < (*ttp); i++ )
        {
            t->x -= 0.3f;
            float  h = Hat(t->x, t->y, t->z );
            Vec3 pos( t->x, t->y, t->z-h );
            Geometry *geom = makeTree( t, dstate );
            bb->addDrawable( geom, pos );
            t++;
        }
        group->addChild( bb );
        ttp++;
    }

    return group;
}

//.........这里部分代码省略.........
    gset->setTexCoordArray( 0, &tc );

    // create the sides of the tank.
    unsigned int i, c = 0;
    for( i = 0; i <= 360; i += 18 )
    {
        float x, y, z;
        float s, t;
        float theta = osg::DegreesToRadians((float)i);

        s = (float)i/90.0;
        t = 1.0;

        x = radius * cosf( theta );
        y = radius * sinf( theta );
        z = 1.0;

        vc[c][0] = x;
        vc[c][1] = y;
        vc[c][2] = z;

        tc[c][0] = s;
        tc[c][1] = t;

        c++;

        t = 0.0;
        z = 0.0;

        vc[c][0] = x;
        vc[c][1] = y;
        vc[c][2] = z;

        tc[c][0] = s;
        tc[c][1] = t;
        c++;
    }

    gset->addPrimitiveSet( new DrawArrays(PrimitiveSet::TRIANGLE_STRIP,0,c) );

    // create the top of the tank.

    int prev_c = c;

    vc[c][0] = 0.0f;
    vc[c][1] = 0.0f;
    vc[c][2] = 1.0f;

    tc[c][0] = 0.0f;
    tc[c][1] = 0.0f;
    c++;

    for( i = 0; i <= 360; i += 18 )
    {
        float x, y, z;
        float s, t;
        float theta = osg::DegreesToRadians((float)i);

        //    s = (float)i/360.0;
        //   t = 1.0;
        s = cosf( theta );
        t = sinf( theta );

        x = radius * cosf( theta );
        y = radius * sinf( theta );
        z = 1.0;

        vc[c][0] = x;
        vc[c][1] = y;
        vc[c][2] = z;

        tc[c][0] = s;
        tc[c][1] = t;

        c++;
    }

    for( i = 0; i < c; i++ )
        conv( vc[i], mat, vc[i] );
     
     gset->addPrimitiveSet(new DrawArrays(PrimitiveSet::TRIANGLE_FAN,prev_c,c-prev_c));




    Texture2D *tex = new Texture2D;

    tex->setWrap( Texture2D::WRAP_S, Texture2D::REPEAT );
    tex->setWrap( Texture2D::WRAP_T, Texture2D::REPEAT );
    tex->setImage(osgDB::readImageFile("Images/tank.rgb"));

    StateSet *dstate = new StateSet;
    dstate->setTextureAttributeAndModes(0, tex, StateAttribute::ON );
    dstate->setTextureAttribute(0, new TexEnv );

    gset->setStateSet( dstate );
    geode->addDrawable( gset );

    return geode;
}

Node *makeSky( void )
{
    int i, j;
    float lev[] = { -5, -1.0, 1.0, 15.0, 30.0, 60.0, 90.0  };
    float cc[][4] =
    {
        { 0.0, 0.0, 0.15 },
        { 0.0, 0.0, 0.15 },
        { 0.4, 0.4, 0.7 },
        { 0.2, 0.2, 0.6 },
        { 0.1, 0.1, 0.6 },
        { 0.1, 0.1, 0.6 },
        { 0.1, 0.1, 0.6 },
    };
    float x, y, z;
    float alpha, theta;
    float radius = 20.0f;
    int nlev = sizeof( lev )/sizeof(float);

    Geometry *geom = new Geometry;

    Vec3Array& coords = *(new Vec3Array(19*nlev));
    Vec4Array& colors = *(new Vec4Array(19*nlev));
    Vec2Array& tcoords = *(new Vec2Array(19*nlev));
    
    
    int ci = 0;

    for( i = 0; i < nlev; i++ )
    {
        for( j = 0; j <= 18; j++ )
        {
            alpha = osg::DegreesToRadians(lev[i]);
            theta = osg::DegreesToRadians((float)(j*20));

            x = radius * cosf( alpha ) * cosf( theta );
            y = radius * cosf( alpha ) * -sinf( theta );
            z = radius * sinf( alpha );

            coords[ci][0] = x;
            coords[ci][1] = y;
            coords[ci][2] = z;

            colors[ci][0] = cc[i][0];
            colors[ci][1] = cc[i][1];
            colors[ci][2] = cc[i][2];
            colors[ci][3] = 1.0;

            tcoords[ci][0] = (float)j/18.0;
            tcoords[ci][1] = (float)i/(float)(nlev-1);

            ci++;
        }


    }

    for( i = 0; i < nlev-1; i++ )
    {
        DrawElementsUShort* drawElements = new DrawElementsUShort(PrimitiveSet::TRIANGLE_STRIP);
        drawElements->reserve(38);

        for( j = 0; j <= 18; j++ )
        {
            drawElements->push_back((i+1)*19+j);
            drawElements->push_back((i+0)*19+j);
        }

        geom->addPrimitiveSet(drawElements);
    }
    
    geom->setVertexArray( &coords );
    geom->setTexCoordArray( 0, &tcoords );

    geom->setColorArray( &colors );
    geom->setColorBinding( Geometry::BIND_PER_VERTEX );


    Texture2D *tex = new Texture2D;
    tex->setImage(osgDB::readImageFile("Images/white.rgb"));

    StateSet *dstate = new StateSet;

    dstate->setTextureAttributeAndModes(0, tex, StateAttribute::OFF );
    dstate->setTextureAttribute(0, new TexEnv );
    dstate->setMode( GL_LIGHTING, StateAttribute::OFF );
    dstate->setMode( GL_CULL_FACE, StateAttribute::ON );
    

    // clear the depth to the far plane.
    osg::Depth* depth = new osg::Depth;
    depth->setFunction(osg::Depth::ALWAYS);
    depth->setRange(1.0,1.0);   
    dstate->setAttributeAndModes(depth,StateAttribute::ON );

    dstate->setRenderBinDetails(-2,"RenderBin");

    geom->setStateSet( dstate );

    Geode *geode = new Geode;
//.........这里部分代码省略.........

Node *makeTerrain( void )
{
    int m, n;
    int  i, j;
    float dbcenter[3];
    float dbradius;

    getDatabaseCenterRadius( dbcenter, &dbradius );

    m = (sizeof( vertex ) /(sizeof( float[3])))/39;
    n = 39;

    Vec3Array& v    = *(new Vec3Array(m*n));
    Vec2Array& t    = *(new Vec2Array(m*n));
    Vec4Array& col  = *(new Vec4Array(1));

    col[0][0] = col[0][1] = col[0][2] = col[0][3] = 1.0f;

    for( i = 0; i < m * n; i++ )
    {
        float* vc = vertex[i];
        v[i][0] = vc[0] - dbcenter[0];
        v[i][1] = vc[1] - dbcenter[1];
        v[i][2] = vc[2];

        float* tc = texcoord[i];
        t[i][0] = tc[0];
        t[i][1] = tc[1];
    }

    Geometry *geom = new Geometry;

    geom->setVertexArray( &v );
    geom->setTexCoordArray( 0, &t );

    geom->setColorArray( &col, Array::BIND_OVERALL );

    for( i = 0; i < m-2; i++ )
    {
        DrawElementsUShort* elements = new DrawElementsUShort(PrimitiveSet::TRIANGLE_STRIP);
        elements->reserve(39*2);
        for( j = 0; j < n; j++ )
        {
            elements->push_back((i+0)*n+j);
            elements->push_back((i+1)*n+j);
        }
        geom->addPrimitiveSet(elements);
    }


    Texture2D *tex = new Texture2D;

    tex->setImage(osgDB::readRefImageFile("Images/lz.rgb"));

    StateSet *dstate = new StateSet;
    dstate->setMode( GL_LIGHTING, StateAttribute::OFF );
    dstate->setTextureAttributeAndModes(0, tex, StateAttribute::ON );
    dstate->setTextureAttribute(0, new TexEnv );

    geom->setStateSet( dstate );

    Geode *geode = new Geode;
    geode->addDrawable( geom );

    return geode;
}