LibGDX 0.9.9 - Apply cubemap in environment

Question

I am using LibGDX 0.9.9. I am trying to render cubemap and fog. So my code snippet below:

public void show() {
    modelBatch = new ModelBatch();
    environ         


        

Answer 1

I played around the cubemap and created a class which doesn't use native textureCube. Instead of it I created 6 planes and located them around the camera. So, my camera is fixed inside these "walls". This implementation is a bit faster and easier than using cubemap described above.

public class SkyBox implements Disposable{  

Matrix4 tranformation;
ShaderProgram program;  
int u_projTrans;
int u_worldTrans;
int u_tex;

Texture[] textures;

Mesh quad;  
boolean invert = false;

protected String vertexShader =             
        " attribute vec4 a_position; "+
        " attribute vec2 a_texCoord0; "+            
        " varying vec2 v_texCoord; "+           
        " uniform mat4 u_worldTrans; "+
        " uniform mat4 u_projTrans; "+          
        " void main() "+
        " {  "+
        "   gl_Position = u_projTrans * u_worldTrans * vec4(a_position);     "+
        "   v_texCoord = a_texCoord0;    "+
        " } ";

protected String fragmentShader = 
        " #ifdef GL_ES \n"+
        " precision mediump float; \n"+
        " #endif \n"+           
        " uniform sampler2D s_diffuse; "+
        " varying vec2 v_texCoord; "+           
        " void main() "+
        " { "+
        "   gl_FragColor = texture2D( s_diffuse, v_texCoord );   "+
        " } ";

public String getDefaultVertexShader(){
    return vertexShader;
}

public String getDefaultFragmentShader(){
    return fragmentShader;
}


public SkyBox (Pixmap positiveX, Pixmap negativeX, Pixmap positiveY, Pixmap negativeY, Pixmap positiveZ, Pixmap negativeZ) {

    textures = new Texture[6];

    textures[3] = new Texture(positiveX);
    textures[2] = new Texture(negativeX);

    textures[4] = new Texture(positiveY);
    textures[5] = new Texture(negativeY);

    textures[0] = new Texture(positiveZ);
    textures[1] = new Texture(negativeZ);

    positiveX.dispose();
    positiveX=null;

    negativeX.dispose();
    negativeX=null;

    positiveY.dispose();
    positiveY=null;

    negativeY.dispose();
    negativeY=null;

    positiveZ.dispose();
    positiveZ=null;

    negativeZ.dispose();
    negativeZ=null;

    init();
}

public SkyBox (FileHandle positiveX, FileHandle negativeX, FileHandle positiveY, FileHandle negativeY, FileHandle positiveZ, FileHandle negativeZ) {
    this(new Pixmap(positiveX), new Pixmap(negativeX), new Pixmap(positiveY), new Pixmap(negativeY), new Pixmap(positiveZ), new Pixmap(negativeZ));     
}

public SkyBox (Pixmap cubemap) {        
    int w = cubemap.getWidth();
    int h = cubemap.getHeight();

    Pixmap[] data = new Pixmap[6];
    for(int i=0; i<6; i++) data[i] = new Pixmap(w/4, h/3, Format.RGB888);
    for(int x=0; x=0 && x<=w/4 && y>=h/3 && y<=h*2/3) data[1].drawPixel(x, y-h/3, cubemap.getPixel(x, y));
            //+Y
            if(x>=w/4 && x<=w/2+1 && y>=0 && y<=h/3) data[2].drawPixel(x-w/4, y, cubemap.getPixel(x, y));
            //+Z
            if(x>=w/4 && x<=w/2 && y>=h/3 && y<=h*2/3) data[4].drawPixel(x-w/4, y-h/3, cubemap.getPixel(x, y));
            //-Y
            if(x>=w/4 && x<=w/2 && y>=h*2/3 && y<=h) data[3].drawPixel(x-w/4, y-h*2/3, cubemap.getPixel(x, y));
            //+X
            if(x>=w/2 && x<=w*3/4 && y>=h/3 && y<=h*2/3) data[0].drawPixel(x-w/2, y-h/3, cubemap.getPixel(x, y));
            //-Z
            if(x>=w*3/4 && x<=w && y>=h/3 && y<=h*2/3) data[5].drawPixel(x-w*3/4, y-h/3, cubemap.getPixel(x, y));
        }

    textures = new Texture[6];

    textures[0] = new Texture(data[4]);
    textures[1] = new Texture(data[5]);

    textures[2] = new Texture(data[1]);
    textures[3] = new Texture(data[0]);

    textures[4] = new Texture(data[2]);
    textures[5] = new Texture(data[3]);

    for(int i=0; i<6; i++) {
        data[i].dispose();
        data[i] = null;
    }
    cubemap.dispose();
    cubemap=null;

    init();
}

public SkyBox (FileHandle cubemap){
    this(new Pixmap(cubemap));
}

public Mesh createTexturedQuad(){
    Mesh quad = new Mesh(true, 4, 6, VertexAttribute.Position(), new VertexAttribute(Usage.TextureCoordinates, 2, "a_texCoord0"));
    quad.setVertices(new float[] 
        {-1f, -1f, 0, 0, 1,
        1f, -1f, 0, 1, 1,
        1f, 1f, 0, 1, 0,
        -1f, 1f, 0, 0, 0});
    quad.setIndices(new short[] {0, 1, 2, 2, 3, 0});
    return quad;
}

public void setInvert(boolean enable){
    invert = enable;
}

public void init() {        
    program = new ShaderProgram(vertexShader, fragmentShader);
    if (!program.isCompiled())
        throw new GdxRuntimeException(program.getLog());
    else Gdx.app.log("shader", "shader compiled successfully!");
    u_projTrans = program.getUniformLocation("u_projTrans");
    u_worldTrans = program.getUniformLocation("u_worldTrans");
    u_tex = program.getUniformLocation("s_diffuse");   

    tranformation = new Matrix4();      
    quad = createTexturedQuad();

}


public void render(Camera camera){      

    Gdx.graphics.getGL20().glCullFace(GL20.GL_BACK);

    program.begin();    
    program.setUniformMatrix(u_projTrans, camera.combined);

    //front
    tranformation.idt();    
    tranformation.translate(camera.position.x, camera.position.y, camera.position.z);           
    tranformation.translate(0, 0, -1);
    if(invert) tranformation.rotate(Vector3.Y, 180);
    program.setUniformMatrix(u_worldTrans, tranformation);      
    textures[0].bind(0);
    program.setUniformi("s_diffuse", 0);        
    quad.render(program, GL20.GL_TRIANGLES);

    //left  
    tranformation.idt();
    tranformation.translate(camera.position.x, camera.position.y, camera.position.z);       
    tranformation.rotate(Vector3.Y, 90);    
    tranformation.translate(0, 0, -1);
    if(invert) tranformation.rotate(Vector3.Y, 180);
    program.setUniformMatrix(u_worldTrans, tranformation);      
    textures[ invert ? 3 : 2].bind(0);
    program.setUniformi("s_diffuse", 0);        
    quad.render(program, GL20.GL_TRIANGLES);

    //right
    tranformation.idt();
    tranformation.translate(camera.position.x, camera.position.y, camera.position.z);       
    tranformation.rotate(Vector3.Y, -90);   
    tranformation.translate(0, 0, -1);
    if(invert) tranformation.rotate(Vector3.Y, 180);
    program.setUniformMatrix(u_worldTrans, tranformation);      
    textures[invert ? 2 : 3].bind(0);
    program.setUniformi("s_diffuse", 0);        
    quad.render(program, GL20.GL_TRIANGLES);

    //bottom
    tranformation.idt();
    tranformation.translate(camera.position.x, camera.position.y, camera.position.z);       
    tranformation.rotate(Vector3.X, -90);   
    tranformation.translate(0, 0, -1);
    if(invert) tranformation.rotate(Vector3.Y, 180);
    program.setUniformMatrix(u_worldTrans, tranformation);      
    textures[5].bind(0);
    program.setUniformi("s_diffuse", 0);        
    quad.render(program, GL20.GL_TRIANGLES);

    //top
    tranformation.idt();
    tranformation.translate(camera.position.x, camera.position.y, camera.position.z);       
    tranformation.rotate(Vector3.X, 90);    
    tranformation.translate(0, 0, -1);
    if(invert) tranformation.rotate(Vector3.Y, 180);
    program.setUniformMatrix(u_worldTrans, tranformation);      
    textures[4].bind(0);
    program.setUniformi("s_diffuse", 0);        
    quad.render(program, GL20.GL_TRIANGLES);

    //back
    tranformation.idt();
    tranformation.translate(camera.position.x, camera.position.y, camera.position.z);           
    tranformation.rotate(Vector3.Y, 180);   
    tranformation.translate(0, 0, -1);
    if(invert) tranformation.rotate(Vector3.Y, 180);
    program.setUniformMatrix(u_worldTrans, tranformation);      
    textures[1].bind(0);
    program.setUniformi("s_diffuse", 0);        
    quad.render(program, GL20.GL_TRIANGLES);

    program.end();  
}

@Override
public void dispose() {
    program.dispose();
    quad.dispose(); 
    for(int i=0; i<6; i++){
        textures[i].dispose();
        textures[i]=null;
    }
}
}

Using of this class is the same as previous one. Happy coding!