/*
Пример взят из набора примеров библиотеки Mesa

iadn
http://www.iadn.narod.ru
iadn@bk.ru
*/

/*
 * 3-D gear wheels.  This program is in the public domain.
 *
 * Brian Paul
 */
 
#include <kos32sys.h> 
#include <kosgl.h> //TinyGL
#include <string.h>
#include <math.h>

#include "SysCall.h"
#include "ProcessTab.h"

int Fps (long x, long y);
extern "C"{
int main(void);
}

struct {
	   int x,y;
	   int dx,dy;
	   } win;

#define KEY_ESC       1
#define KEY_F     	 33

char *title1 = "TinyGL in KolibriOS";
char *title2 = "F full screen";
char *title3 = "ESC - exit";
char *fps    = "FPS:";

unsigned char FullScreen = 0;
unsigned char skin = 3;

proc_info* pri;
KOSGLContext cgl;

static GLfloat view_rotx=20.0, view_roty=30.0, view_rotz=0.0;
static GLint gear1, gear2, gear3;
static GLfloat angle = 0.0;

static GLuint limit;
static GLuint count = 1;

/*
 * Draw a gear wheel.  You'll probably want to call this function when
 * building a display list since we do a lot of trig here.
 *
 * Input:  inner_radius - radius of hole at center
 *         outer_radius - radius at center of teeth
 *         width - width of gear
 *         teeth - number of teeth
 *         tooth_depth - depth of tooth
 */
static void gear( GLfloat inner_radius, GLfloat outer_radius, GLfloat width,
		  GLint teeth, GLfloat tooth_depth )
{
   GLint i;
   GLfloat r0, r1, r2;
   GLfloat angle, da;
   GLfloat u, v, len;

   r0 = inner_radius;
   r1 = outer_radius - tooth_depth/2.0;
   r2 = outer_radius + tooth_depth/2.0;

   da = 2.0*M_PI / teeth / 4.0;

   glShadeModel( GL_FLAT );

   glNormal3f( 0.0, 0.0, 1.0 );

   /* draw front face */
   glBegin( GL_QUAD_STRIP );
   for (i=0;i<=teeth;i++) {
      angle = i * 2.0*M_PI / teeth;
      glVertex3f( r0*cos(angle), r0*sin(angle), width*0.5 );
      glVertex3f( r1*cos(angle), r1*sin(angle), width*0.5 );
      glVertex3f( r0*cos(angle), r0*sin(angle), width*0.5 );
      glVertex3f( r1*cos(angle+3*da), r1*sin(angle+3*da), width*0.5 );
   }
   glEnd();

   /* draw front sides of teeth */
   glBegin( GL_QUADS );
   da = 2.0*M_PI / teeth / 4.0;
   for (i=0;i<teeth;i++) {
      angle = i * 2.0*M_PI / teeth;

      glVertex3f( r1*cos(angle),      r1*sin(angle),      width*0.5 );
      glVertex3f( r2*cos(angle+da),   r2*sin(angle+da),   width*0.5 );
      glVertex3f( r2*cos(angle+2*da), r2*sin(angle+2*da), width*0.5 );
      glVertex3f( r1*cos(angle+3*da), r1*sin(angle+3*da), width*0.5 );
   }
   glEnd();

   glNormal3f( 0.0, 0.0, -1.0 );

   /* draw back face */
   glBegin( GL_QUAD_STRIP );
   for (i=0;i<=teeth;i++) {
      angle = i * 2.0*M_PI / teeth;
      glVertex3f( r1*cos(angle), r1*sin(angle), -width*0.5 );
      glVertex3f( r0*cos(angle), r0*sin(angle), -width*0.5 );
      glVertex3f( r1*cos(angle+3*da), r1*sin(angle+3*da), -width*0.5 );
      glVertex3f( r0*cos(angle), r0*sin(angle), -width*0.5 );
   }
   glEnd();

   /* draw back sides of teeth */
   glBegin( GL_QUADS );
   da = 2.0*M_PI / teeth / 4.0;
   for (i=0;i<teeth;i++) {
      angle = i * 2.0*M_PI / teeth;

      glVertex3f( r1*cos(angle+3*da), r1*sin(angle+3*da), -width*0.5 );
      glVertex3f( r2*cos(angle+2*da), r2*sin(angle+2*da), -width*0.5 );
      glVertex3f( r2*cos(angle+da),   r2*sin(angle+da),   -width*0.5 );
      glVertex3f( r1*cos(angle),      r1*sin(angle),      -width*0.5 );
   }
   glEnd();

   /* draw outward faces of teeth */
   glBegin( GL_QUAD_STRIP );
   for (i=0;i<teeth;i++) {
      angle = i * 2.0*M_PI / teeth;

      glVertex3f( r1*cos(angle),      r1*sin(angle),       width*0.5 );
      glVertex3f( r1*cos(angle),      r1*sin(angle),      -width*0.5 );
      u = r2*cos(angle+da) - r1*cos(angle);
      v = r2*sin(angle+da) - r1*sin(angle);
      len = sqrt( u*u + v*v );
      u /= len;
      v /= len;
      glNormal3f( v, -u, 0.0 );
      glVertex3f( r2*cos(angle+da),   r2*sin(angle+da),    width*0.5 );
      glVertex3f( r2*cos(angle+da),   r2*sin(angle+da),   -width*0.5 );
      glNormal3f( cos(angle), sin(angle), 0.0 );
      glVertex3f( r2*cos(angle+2*da), r2*sin(angle+2*da),  width*0.5 );
      glVertex3f( r2*cos(angle+2*da), r2*sin(angle+2*da), -width*0.5 );
      u = r1*cos(angle+3*da) - r2*cos(angle+2*da);
      v = r1*sin(angle+3*da) - r2*sin(angle+2*da);
      glNormal3f( v, -u, 0.0 );
      glVertex3f( r1*cos(angle+3*da), r1*sin(angle+3*da),  width*0.5 );
      glVertex3f( r1*cos(angle+3*da), r1*sin(angle+3*da), -width*0.5 );
      glNormal3f( cos(angle), sin(angle), 0.0 );
   }

   glVertex3f( r1*cos(0.0), r1*sin(0.0), width*0.5 );
   glVertex3f( r1*cos(0.0), r1*sin(0.0), -width*0.5 );

   glEnd();

   glShadeModel( GL_SMOOTH );

   /* draw inside radius cylinder */
   glBegin( GL_QUAD_STRIP );
   for (i=0;i<=teeth;i++) {
      angle = i * 2.0*M_PI / teeth;
      glNormal3f( -cos(angle), -sin(angle), 0.0 );
      glVertex3f( r0*cos(angle), r0*sin(angle), -width*0.5 );
      glVertex3f( r0*cos(angle), r0*sin(angle), width*0.5 );
   }
   glEnd();      
}

void init( void )
{
   static GLfloat pos[4] = {5.0, 5.0, 10.0, 1.0 };
   static GLfloat red[4] = {0.8, 0.1, 0.0, 1.0 };
   static GLfloat green[4] = {0.0, 0.8, 0.2, 1.0 };
   static GLfloat blue[4] = {0.2, 0.2, 1.0, 1.0 };

   glLightfv( GL_LIGHT0, GL_POSITION, pos );
   glEnable( GL_CULL_FACE );
   glEnable( GL_LIGHTING );
   glEnable( GL_LIGHT0 );
   glEnable( GL_DEPTH_TEST );

   /* make the gears */
   gear1 = glGenLists(1);
   glNewList(gear1, GL_COMPILE);
   glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red );
   gear( 1.0, 4.0, 1.0, 20, 0.7 );
   glEndList();

   gear2 = glGenLists(1);
   glNewList(gear2, GL_COMPILE);
   glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green );
   gear( 0.5, 2.0, 2.0, 10, 0.7 );
   glEndList();

   gear3 = glGenLists(1);
   glNewList(gear3, GL_COMPILE);
   glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue );
   gear( 1.3, 2.0, 0.5, 10, 0.7 );
   glEndList();

   glEnable( GL_NORMALIZE );
   
   glViewport(0, 0, (GLint)500, (GLint)480);
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   glFrustum( -1.0, 1.0, -1, 1, 5.0, 60.0 );
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();
   glTranslatef( 0.0, 0.0, -40.0 );
   glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );   
}

void reshape()
{   
   get_proc_info((char*)pri);
   glViewport(0, 0, pri->width, pri->height-20);
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   gluPerspective(45.0, (GLfloat)pri->width/pri->height, 1.0, 60.0);
   glTranslatef( 0.0, 0.0, 20.0 );
   glMatrixMode(GL_MODELVIEW);
   glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );     
}

void disabletgl()
{
	kosglDestroyContext(cgl); 
	delete pri;
}

void kos_text(int x, int y, int color, const char* text, int len)
{
	asm volatile ("int $0x40"::"a"(4),"b"((x<<16) | y),"c"(color),"d"((unsigned long)text),"S"(len));
};

void Title()
{
     kos_text(300,8,0x10ffffff,fps,strlen(fps));
	 kos_text(180,8,0x00ffffff,title2,strlen(title2));
     kos_text(600,8,0x00ffffff,title3,strlen(title3));
}

void kol_wnd_define(unsigned x, unsigned y, unsigned w, unsigned h, unsigned cs, unsigned b, char *t)
{
asm volatile ("int $0x40"::"a"(0), "b"(x*65536+w), "c"(y*65536+h), "d"(cs), "D"(t), "S"(b) );
}

void draw_window(void)
{
	// start redraw
	begin_draw();
	// define&draw window
	kol_wnd_define(win.x,win.y,win.dx,win.dy,TYPEWIN(0,0,0,1,skin,0,0,0),0,title1);
    // end redraw
    end_draw();
    // display string
    Title();
}

int kos_get_key()
{
	unsigned short __ret;
	asm volatile("int $0x40":"=a"(__ret):"0"(2));
	if(!(__ret & 0xFF)) return (__ret>>8)&0xFF; else return 0;
}

int main(void)          
{

  win.x = 100;
  win.y = 100;
  win.dx = 400;
  win.dy = 400;	 

  draw_window();

  cgl = kosglCreateContext( 0, 0);
  kosglMakeCurrent( 0, 20, win.dx, win.dy-20, cgl);

  init();

  pri = new proc_info;
  SysCall(66,1,1);

  reshape();
  
do{

   glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );

   glPushMatrix();
   glRotatef( view_rotx, 1.0, 0.0, 0.0 );
   glRotatef( view_roty, 0.0, 1.0, 0.0 );
   glRotatef( view_rotz, 0.0, 0.0, 1.0 );

   glPushMatrix();
   glTranslatef( -2.0, -2.0, 0.0 );
   glRotatef( angle, 0.0, 0.0, 1.0 );
   glCallList(gear1);
   glPopMatrix();

   glPushMatrix();
   glTranslatef( 4.1, -2.0, 0.0 );
   glRotatef( -2.0*angle-9.0, 0.0, 0.0, 1.0 );
   glCallList(gear2);
   glPopMatrix();

   glPushMatrix();
   glTranslatef( -2.1, 4.2, 0.0 );
   glRotatef( -2.0*angle-25.0, 0.0, 0.0, 1.0 );
   glCallList(gear3);
   glPopMatrix();

   glPopMatrix();
   
 kosglSwapBuffers();

 angle += 0.01 + 0.3* Fps (330,8);
 			
		  switch(SysCall(11))
		      {
		          case 1: draw_window();				  	   	  
				  	   	  reshape();
				  	   	  break;
				  	   	  
		          case 2: 		          
		          	   switch(kos_get_key()){

						   case KEY_F:
                                    if(!FullScreen){									 
									 skin=0;
									 SysCall(67,0,0,SysCall(14)>>16,SysCall(14)&0xffff);
									 draw_window();
									 reshape();
									 FullScreen = 1;
									}
									else{
									 skin=3;
									 draw_window();
									 SysCall(67,win.x,win.y,win.dx,win.dy);
									 reshape();
									 FullScreen = 0;
									};
						  			break;
		          
                           case KEY_ESC: disabletgl();
						  				 return 0;}
						  				 break;
						  			
			  	  case 3: disabletgl();
						  return 0;
		      }
}while(1);
}