/*
 * $Id: background.c 264 2005-11-06 17:43:44Z mrbrown $
 *
 * Copyright 2003 Kenta Cho. All rights reserved.
 */

/**
 * Screen background.
 *
 * @version $Revision: 264 $
 */
#include "genmcr.h"
#include "background.h"
#include "screen.h"

#define PLANE_MAX 4

static Plane plane[PLANE_MAX];
static int planeNum;

void initBackground(int s) {
  int i;
  Plane *pl;
  switch ( s ) {
  case 0:
    planeNum = 3;
    for ( i=0 ; i<planeNum ; i++ ) {
      pl = &(plane[i]);
      pl->xn = 8; pl->yn = 16;
      pl->width = 3.0f; pl->height = 2.0f;
      pl->x = -pl->width*pl->xn/2; 
      pl->y = -pl->height*pl->yn/2;
      pl->z = -10.0f;
      pl->ox = pl->oy = 0;
      switch ( i ) {
      case 0:
	pl->r = 250; pl->g = 200; pl->b = 20; pl->a = 100;
	pl->d1 = 0;
	pl->mx = 0; pl->my = 0.05;
	break;
      case 1:
	pl->r = 200; pl->g = 150; pl->b = 20; pl->a = 50;
	pl->d1 = 32;
	pl->mx = 0.04; pl->my = 0.05;
	break;
      case 2:
	pl->r = 200; pl->g = 150; pl->b = 20; pl->a = 50;
	pl->d1 = -32&1023;
	pl->mx = -0.04; pl->my = 0.05;
	break;
      }
    }
    break;
  case 1:
    planeNum = 2;
    for ( i=0 ; i<planeNum ; i++ ) {
      pl = &(plane[i]);
      pl->xn = 8; pl->yn = 8;
      pl->width = 3.0f; pl->height = 3.0f;
      pl->x = -pl->width*pl->xn/2; 
      pl->y = -pl->height*pl->yn/2;
      pl->z = -10.0f;
      pl->ox = pl->oy = 0;
      switch ( i ) {
      case 0:
	pl->r = 200; pl->g = 100; pl->b = 200; pl->a = 150;
	pl->d1 = 4;
	pl->mx = 0; pl->my = 0.12;
	break;
      case 1:
	pl->r = 120; pl->g = 100; pl->b = 120; pl->a = 120;
	pl->d1 = 4;
	pl->mx = 0; pl->my = -0.05;
	break;
      }
    }
    break;
  case 2:
    planeNum = 3;
    for ( i=0 ; i<planeNum ; i++ ) {
      pl = &(plane[i]);
      switch ( i ) {
      case 0:
	pl->xn = 6; pl->yn = 6;
	pl->width = 5.0f; pl->height = 5.0f;
	break;
      case 1:
      case 2:
	pl->xn = 16; pl->yn = 16;
	pl->width = 1.5f; pl->height = 1.5f;
	break;
      }
      pl->x = -pl->width*pl->xn/2; 
      pl->y = -pl->height*pl->yn/2;
      pl->z = -10.0f;
      pl->ox = pl->oy = 0;
      switch ( i ) {
      case 0:
	pl->r = 150; pl->g = 200; pl->b = 150; pl->a = 125;
	pl->d1 = 0;
	pl->mx = 0; pl->my = 0.04;
	break;
      case 1:
	pl->r = 170; pl->g = 200; pl->b = 170; pl->a = 60;
	pl->d1 = 0;
	pl->mx = 0.01; pl->my = 0.01;
	break;
      case 2:
	pl->r = 170; pl->g = 200; pl->b = 170; pl->a = 60;
	pl->d1 = 0;
	pl->mx = -0.01; pl->my = 0.01;
	break;
      }
    }
    break;
  case 3:
    planeNum = 4;
    for ( i=0 ; i<planeNum ; i++ ) {
      pl = &(plane[i]);
      pl->xn = 8; pl->yn = 16;
      pl->width = 4.0f; pl->height = 2.5f;
      pl->x = -pl->width*pl->xn/2; 
      pl->y = -pl->height*pl->yn/2;
      pl->z = -10.0f;
      pl->ox = pl->oy = 0;
      pl->r = 200; pl->g = 200; pl->b = 100; 
      switch ( i ) {
      case 0:
	pl->a = 72;
	pl->d1 = 0;
	pl->mx = -0.05; pl->my = 0.1;
	break;
      case 1:
	pl->a = 40;
	pl->d1 = 10;
	pl->mx = -0.025; pl->my = 0;
	break;
      case 2:
	pl->a = 40;
	pl->d1 = -10;
	pl->mx = 0.025; pl->my = 0;
	break;
      case 3:
	pl->a = 72;
	pl->d1 = 0;
	pl->mx = -0.025; pl->my = 0.1;
	break;
      }
    }
    break;
  }
}

void moveBackground() {
  int i;
  Plane *pl;
  for ( i=0 ; i<planeNum ; i++ ) {
    pl = &(plane[i]);
    pl->ox -= pl->mx;
    if ( pl->ox < 0 )          pl->ox += pl->width;
    if ( pl->ox >= pl->width ) pl->ox -= pl->width;
    pl->oy -= pl->my;
    if ( pl->oy < 0 )           pl->oy += pl->height;
    if ( pl->oy >= pl->height ) pl->oy -= pl->height;
  }
}

void drawBackground() {
  int lx, ly, i;
  float x, y;
  Plane *pl;
  for ( i=0 ; i<planeNum ; i++ ) {
    pl = &(plane[i]);
    x = pl->x+pl->ox;
    for ( lx=0 ; lx<pl->xn ; lx++, x+=pl->width ) {
      drawRollLineAbs(x, pl->y+pl->oy, pl->z, x, pl->y+pl->oy+pl->height*pl->yn, pl->z,
		      pl->r, pl->g, pl->b, pl->a, pl->d1);
    }
    y = pl->y + pl->oy;
    for ( ly=0 ; ly<pl->yn ; ly++, y+=pl->height ) {
      drawRollLineAbs(pl->x+pl->ox, y, pl->z, pl->x+pl->ox+pl->width*pl->xn, y, pl->z,
		      pl->r, pl->g, pl->b, pl->a, pl->d1);
    }
  }
}