CubeMap.pde

import codeanticode.glgraphics.*;
import processing.opengl.*;
import javax.media.opengl.*;
import java.nio.IntBuffer;
import java.nio.ByteBuffer;

GL gl;
GLSLShader shader;
PGraphicsOpenGL pgl;
ByteBuffer byteBuffer;
IntBuffer intBuffer;
int[] envMapTextureID = {0};
GLTexture tex;

void setup () {
    size(400, 400, GLConstants.GLGRAPHICS);
    hint(ENABLE_OPENGL_4X_SMOOTH);
    
    pgl = (PGraphicsOpenGL) g;
    gl = pgl.gl;
    
    shader = new GLSLShader(this, "fluxus.vert", "fluxus.frag");
    
    tex = new GLTexture(this, "fu.jpg");
    tex.loadPixels();
    
    byteBuffer = ByteBuffer.allocate(tex.pixels.length * 4);
    intBuffer = byteBuffer.asIntBuffer();

    for (int i = 0; i < intBuffer.capacity(); i++) {
        intBuffer.put(tex.pixels[i]);
    }
    // intBuffer.put(tex.pixels);
    
    // init cubemap textures
    gl.glGenTextures(1, envMapTextureID, 0);
    gl.glBindTexture(GL.GL_TEXTURE_CUBE_MAP, envMapTextureID[0]);
    gl.glTexParameteri(GL.GL_TEXTURE_CUBE_MAP, GL.GL_TEXTURE_WRAP_S, GL.GL_CLAMP_TO_EDGE);
    gl.glTexParameteri(GL.GL_TEXTURE_CUBE_MAP, GL.GL_TEXTURE_WRAP_T, GL.GL_CLAMP_TO_EDGE);
    gl.glTexParameteri(GL.GL_TEXTURE_CUBE_MAP, GL.GL_TEXTURE_WRAP_R, GL.GL_CLAMP_TO_EDGE);
    gl.glTexParameteri(GL.GL_TEXTURE_CUBE_MAP, GL.GL_TEXTURE_MIN_FILTER, GL.GL_NEAREST);
    gl.glTexParameteri(GL.GL_TEXTURE_CUBE_MAP, GL.GL_TEXTURE_MAG_FILTER, GL.GL_NEAREST);
    
    for (int i = 0; i < 6; i++) {
        gl.glTexImage2D(GL.GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL.GL_RGBA, tex.width, tex.height, 0, GL.GL_RGBA, GL.GL_UNSIGNED_BYTE, byteBuffer);
    }
}

void draw () {
    background(255);
    fill(255);

    shader.setFloatUniform("RefractionIndex", 0.5);
    
    translate(mouseX, mouseY, 0);
    shader.start();
        sphere(100);
    shader.stop();  
    
    image(tex, 0, 0); 
}