/* Author: Josh Holtrop
 * DornerWorks screensaver
 */

#include <GL/gl.h>
#include <GL/glu.h>
#include "LightBounce.h"

#include <iostream>
#include <vector>
using namespace std;

#define SIZE 5

/* construct screensaver mode and do some basic OpenGL setup */
LightBounce::LightBounce(SSMain * _SSMain) : SSMode(_SSMain)
{
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(60.0,
                   (double)m_SSMain->getWidth()
                     / (double)m_SSMain->getHeight()
                     / (double)m_SSMain->getNumMonitors(),
                   0.01,
                   1000.01);
    glMatrixMode(GL_MODELVIEW);

    LogoBox tmp;
    float box_stride = tmp.getWidth() * 1.2;
    float half_size = SIZE * box_stride / 2.0;
    float y = -half_size;
    int rot = false;
    for (int i = 0; i < SIZE; i++)
    {
        float x = -half_size;
        for (int j = 0; j < SIZE; j++)
        {
            LightBounce_Box * box = new LightBounce_Box;
            box->logoBox = new LogoBox();
            box->x = x;
            box->y = y;
            box->z = -half_size;
            box->xr = 0;
            box->yr = 0;
            box->zr = rot ? 90.0 : 0;
            m_boxes.push_back(box);
            x += box_stride;
            rot = !rot;
        }
        y += box_stride;
    }
}

/* called every time this screensaver mode should redraw the screen */
void LightBounce::update()
{
    SSMode::update();
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    int numMonitors = m_SSMain->getNumMonitors();
    int width = m_SSMain->getWidth();
    int height = m_SSMain->getHeight();
    for (int i = 0; i < numMonitors; i++)
    {
        glViewport(i*width/numMonitors, 0, width/numMonitors, height);
        glLoadIdentity();
        gluLookAt(0, 0, SIZE * 5.0, 0, 0, 0, 0, 1, 0);
        glRotatef(m_elapsed/33.0f, 0, 1, 0);
        int sz = m_boxes.size();
        for (int i = 0; i < sz; i++)
        {
            glPushMatrix();
            glTranslatef(m_boxes[i]->x,
                         m_boxes[i]->y,
                         m_boxes[i]->z);
            glRotatef(m_boxes[i]->xr, 1, 0, 0);
            glRotatef(m_boxes[i]->yr, 0, 1, 0);
            glRotatef(m_boxes[i]->zr, 0, 0, 1);
            m_boxes[i]->logoBox->draw();
            glPopMatrix();
        }
    }
    SDL_GL_SwapBuffers();
}