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/*
 * Project: S.Ha.R.K.
 *
 * Coordinators:
 *   Giorgio Buttazzo    <giorgio@sssup.it>
 *   Paolo Gai           <pj@gandalf.sssup.it>
 *
 * Authors     :
 *   Giacomo Guidi       <giacomo@gandalf.sssup.it>
 *
 *
 * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
 *
 * http://www.sssup.it
 * http://retis.sssup.it
 * http://shark.sssup.it
 */

#include <drivers/vga.h>
#include <drivers/keyb.h>

#include <GL/osmesa.h>
#include <GL/glut.h>

#include <math.h>
#include <stdlib.h>
#include <assert.h>
#include <kernel/log.h>
#include <kernel/kern.h>

#include <stdio.h>

#ifndef M_PI
#define M_PI 3.14159265
#endif

#define WIDTH 640
#define HEIGHT 480
#define BYTES_PP 2 //BytesPerPixel
#define INITSTR G640x480x64K //SVGAlib standard mode definitions
#define CARD NV3 //Video driver (Supported SAVAGE, NV3, R128 from SVGALib)

#define DEG2RAD (3.14159/180.0)

static GLint ImgWidth, ImgHeight;
static GLenum ImgFormat;
static GLubyte *Image = NULL;

#define MAX_OBJECTS 2
static GLint table_list;
static GLint objects_list[MAX_OBJECTS];

static GLfloat xrot, yrot;
static GLfloat spin;

static GLboolean Anim = GL_TRUE;

OSMesaContext ctx;

unsigned char *rgb_565_buf = NULL; //RGB 16 bpp Buffer
unsigned char *video_buf = NULL; //Video Buffer

unsigned long int VMEMLONG = WIDTH * HEIGHT * BYTES_PP / 4; // Used by copy_videomem_16to16
unsigned long int RGB565MEM = WIDTH * HEIGHT * BYTES_PP; // Total video mem

static GLint w = WIDTH, h = HEIGHT;

unsigned long int PERIOD_REFRESH = 80000; //fps = 20
unsigned long int PERIOD_DISEGNA = 80000;

unsigned long int WCET_REFRESH, WCET_DISEGNA;

TASK refesh(void);
TASK disegna(void);

GLUquadricObj *q;

PID refresh_PID, disegna_PID;

static void gl_init( void )
{
   GLfloat yAspect = 2.5;
   GLfloat xAspect = yAspect * (float) w / (float) h;

   //Create the OSMesa Context
   ctx = OSMesaCreateContext(OSMESA_RGB_565, NULL);

   //Make Current Context
   OSMesaMakeCurrent(ctx, rgb_565_buf, GL_UNSIGNED_SHORT_5_6_5, WIDTH, HEIGHT);

   q = gluNewQuadric();
   gluQuadricDrawStyle( q, GLU_FILL );
   gluQuadricNormals( q, GLU_SMOOTH );

   ImgWidth = 100;
   ImgHeight = 100;
   ImgFormat = GL_RGB;
   
   Image = malloc(ImgWidth * ImgHeight * 3);
   
   /*Image = LoadRGBImage( TABLE_TEXTURE, &ImgWidth, &ImgHeight, &ImgFormat );
   if (!Image) {
      printf("Couldn't read %s\n", TABLE_TEXTURE);
      exit(0);
   }*/

   gluBuild2DMipmaps(GL_TEXTURE_2D, 3, ImgWidth, ImgHeight,
                     ImgFormat, GL_UNSIGNED_BYTE, Image);

   glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
   glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
   glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
   glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );

   xrot = 30.0;
   yrot = 50.0;
   spin = 0.0;

   glShadeModel( GL_FLAT );
   
   glEnable( GL_LIGHT0 );
   glEnable( GL_LIGHTING );

   glClearColor( 0.5, 0.5, 0.9, 0.0 );

   glEnable( GL_NORMALIZE );

   glViewport(0, 0, w, h);
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   glFrustum( -xAspect, xAspect, yAspect, -yAspect, 10.0, 30.0 );
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();

}

static void draw_objects( GLfloat eyex, GLfloat eyey, GLfloat eyez )
{
   static GLfloat cyan[] = { 0.0, 1.0, 1.0, 1.0 };
   static GLfloat green[] = { 0.2, 1.0, 0.2, 1.0 };
   static GLfloat black[] = { 0.0, 0.0, 0.0, 0.0 };

#ifndef USE_ZBUFFER
   if (eyex<0.5) {
#endif
           glPushMatrix();
           glTranslatef( 1.0, 1.5, 0.0 );
           glRotatef( spin, 1.0, 0.5, 0.0 );
           glRotatef( 0.5*spin, 0.0, 0.5, 1.0 );
           glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, cyan );
           glMaterialfv( GL_FRONT, GL_EMISSION, black );
           gluCylinder( q, 0.5, 0.5,  1.0, 15, 1 );
           glPopMatrix();
       
           glPushMatrix();
           glTranslatef( -1.0, 0.85+3.0*fabs( cos(0.01*spin) ), 0.0 );
           glRotatef( 0.5*spin, 0.0, 0.5, 1.0 );
           glRotatef( spin, 1.0, 0.5, 0.0 );
           glScalef( 0.5, 0.5, 0.5 );
           glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green );
           glMaterialfv( GL_FRONT, GL_EMISSION, black );
           gluCylinder( q, 1.5, 0.0,  2.5, 15, 1 );
           glPopMatrix();
#ifndef USE_ZBUFFER
   }
   else {      
           glPushMatrix();
           glTranslatef( -1.0, 0.85+3.0*fabs( cos(0.01*spin) ), 0.0 );
           glRotatef( 0.5*spin, 0.0, 0.5, 1.0 );
           glRotatef( spin, 1.0, 0.5, 0.0 );
           glScalef( 0.5, 0.5, 0.5 );
           glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green );
           glMaterialfv( GL_FRONT, GL_EMISSION, black );
           gluCylinder( q, 1.5, 0.0,  2.5, 15, 1 );
           glPopMatrix();

           glPushMatrix();
           glTranslatef( 1.0, 1.5, 0.0 );
           glRotatef( spin, 1.0, 0.5, 0.0 );
           glRotatef( 0.5*spin, 0.0, 0.5, 1.0 );
           glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, cyan );
           glMaterialfv( GL_FRONT, GL_EMISSION, black );
           gluCylinder( q, 0.5, 0.5,  1.0, 15, 1 );
           glPopMatrix();
   }
#endif
}

static void draw_table( void )
{
   static GLfloat table_mat[] = { 1.0, 1.0, 1.0, 0.6 };
   static GLfloat gray[] = { 0.4, 0.4, 0.4, 1.0 };

   /* load table's texture */
   glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, table_mat );
   glMaterialfv( GL_FRONT, GL_DIFFUSE, table_mat );
   glMaterialfv( GL_FRONT, GL_AMBIENT, gray );
   
   /* draw textured square for the table */
   glPushMatrix();
   glScalef( 4.0, 4.0, 4.0 );
   glBegin( GL_POLYGON );
   glNormal3f( 0.0, 1.0, 0.0 );
   glTexCoord2f( 0.0, 0.0 );   glVertex3f( -1.0, 0.0,  1.0 );
   glTexCoord2f( 1.0, 0.0 );   glVertex3f(  1.0, 0.0,  1.0 );
   glTexCoord2f( 1.0, 1.0 );   glVertex3f(  1.0, 0.0, -1.0 );
   glTexCoord2f( 0.0, 1.0 );   glVertex3f( -1.0, 0.0, -1.0 );
   glEnd();
   glPopMatrix();

   glDisable( GL_TEXTURE_2D );

}

static void draw( void )
{
   static GLfloat light_pos[] = { 0.0, 20.0, 0.0, 1.0 };
   static GLfloat dist = 20.0;
   static GLfloat eyex, eyey, eyez;

   glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);

   eyex = dist * cos(yrot*DEG2RAD) * cos(xrot*DEG2RAD);
   eyez = dist * sin(yrot*DEG2RAD) * cos(xrot*DEG2RAD);
   eyey = dist * sin(xrot*DEG2RAD);

   /* view from top */
   glPushMatrix();
   gluLookAt( eyex, eyey, eyez, 0.0, 0.0, 0.0,  0.0, 1.0, 0.0 );

   glLightfv( GL_LIGHT0, GL_POSITION, light_pos );
 
   /* draw table into stencil planes */
   glDisable( GL_DEPTH_TEST );
   glEnable( GL_STENCIL_TEST );
   glStencilFunc( GL_ALWAYS, 1, 0xffffffff );
   glStencilOp( GL_REPLACE, GL_REPLACE, GL_REPLACE );
   glColorMask( GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE );
   draw_table();
   glColorMask( GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE );

   glEnable( GL_DEPTH_TEST );

   /* render view from below (reflected viewport) */
   /* only draw where stencil==1 */
   if (eyey>0.0) {
      glPushMatrix();
 
      glStencilFunc( GL_EQUAL, 1, 0xffffffff );  /* draw if ==1 */
      glStencilOp( GL_KEEP, GL_KEEP, GL_KEEP );
      glScalef( 1.0, -1.0, 1.0 );

      /* Reposition light in reflected space. */
      glLightfv(GL_LIGHT0, GL_POSITION, light_pos);

      draw_objects(eyex, eyey, eyez);
      glPopMatrix();

      /* Restore light's original unreflected position. */
      glLightfv(GL_LIGHT0, GL_POSITION, light_pos);
   }

   glDisable( GL_STENCIL_TEST );

   glEnable( GL_BLEND );
   glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );

   glEnable( GL_TEXTURE_2D );
   draw_table();
   glDisable( GL_TEXTURE_2D );
   glDisable( GL_BLEND );

   /* view from top */
   glPushMatrix();

   draw_objects(eyex, eyey, eyez);

   glPopMatrix();

   glPopMatrix();

   glFinish();
 
}

static int screen(int mode)
{

  vga_modeinfo *minf;

  vga_setmode(mode,CARD);
  minf = vga_getmodeinfo(mode);
  if(! (minf->flags & CAPABLE_LINEAR)){
    vga_setmode(TEXT,CARD);
    printk(KERN_INFO "The mode %d is not capable of linear\n",mode);
    return 1;
  }
  vga_setpage(0);
  if(vga_setlinearaddressing() == -1) {
    vga_setmode(TEXT,CARD);
    printk(KERN_INFO "Could not set linear addressing for mode %d\n",mode);
    return 1;
  }
 
  video_buf = vga_getgraphmem();
  rgb_565_buf = malloc(RGB565MEM);

  grx_setbuffer(rgb_565_buf, WIDTH, HEIGHT);    //Init of RGB16 version of grx functions
                                                //created to work with Mesa buffer
  return 0;
 
}

void program_end(void *arg)
{
 
  OSMesaDestroyContext(ctx);
  free(rgb_565_buf);

  vga_setmode(TEXT,CARD);

  sys_end();

}

void program_key_end(KEY_EVT *k)
{

  sys_end();

}

TASK refresh(void)
{

  while(1) {

    copy_videomem_16to16(rgb_565_buf, video_buf, VMEMLONG);
    task_endcycle();

  }

  sys_end();

}


TASK disegna(void)
{

  char text[100];
  TIME disegna_TIME, refresh_TIME;
 
  while(1) {
   
    jet_gettable(refresh_PID, &refresh_TIME, 1);
    jet_gettable(disegna_PID, &disegna_TIME, 1);

    spin += 2.0;
    yrot += 3.0;

    draw();
 
    sprintf(text,"Hard Task Refresh PER:%6d us EX:%6d us",(int)PERIOD_REFRESH,(int)refresh_TIME);
    grx_text(text,10,5,rgb16(0,0,255),0);    
    sprintf(text,"Hard Task Draw    PER:%6d us EX:%6d us",(int)PERIOD_DISEGNA,(int)disegna_TIME);
    grx_text(text,10,15,rgb16(0,0,255),0);

    task_endcycle();

  }

  sys_end();

}

int main (int argc, char *argv[])
{
   
    HARD_TASK_MODEL ht_refresh, ht_disegna;

    sys_atrunlevel(program_end,NULL, RUNLEVEL_BEFORE_EXIT);

    clear();
   
    WCET_REFRESH =((long int) PERIOD_REFRESH * (0.22));
    WCET_DISEGNA =((long int) PERIOD_DISEGNA * (0.72));

    hard_task_default_model(ht_refresh);
    hard_task_def_wcet(ht_refresh,WCET_REFRESH);
    hard_task_def_mit(ht_refresh,PERIOD_REFRESH);
    hard_task_def_usemath(ht_refresh);
    hard_task_def_group(ht_refresh,1);
    hard_task_def_ctrl_jet(ht_refresh);

    refresh_PID = task_create("refresh", refresh, &ht_refresh, NULL);
    if (refresh_PID == -1) {
      sys_end();
      exit(4);
    }

    hard_task_default_model(ht_disegna);
    hard_task_def_mit(ht_disegna,PERIOD_DISEGNA);
    hard_task_def_wcet(ht_disegna,WCET_DISEGNA);
    hard_task_def_group(ht_disegna,1);
    hard_task_def_ctrl_jet(ht_disegna);
    hard_task_def_usemath(ht_disegna);

    disegna_PID = task_create("disegna", disegna, &ht_disegna, NULL);
    if (disegna_PID == -1) {
      sys_end();
      exit(4);
    }

    {
      KEY_EVT k;
      k.flag = ALTL_BIT;
      k.scan = KEY_C;
      k.ascii = 'c';
      keyb_hook(k,program_key_end);
    }
       
    if (screen(INITSTR)) {
        printk(KERN_INFO "Graphical initialization failed !!\n");
        sys_end();
    }

    memset(rgb_565_buf, 0, RGB565MEM);

    gl_init();

    group_activate(1);

    return 0;
       
}