/*
	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
 */
 
/*
 * Newlib port by maxcodehack
 */
 
#include <kos32sys.h> 
#include <kosgl.h> // TinyGL
#include <string.h>
#include <math.h>

#include "SysCall.h"

int Fps (long x, long y);

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

#define KEY_ESC       1
#define KEY_F     	 33

char *title = "Gears (F - full screen, ESC - exit)";
char *fps    = "FPS:";

unsigned char FullScreen = 0;
unsigned char skin = 0x34;

oskey_t key;

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()
{
	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(180,8,0x90ffffff,title2,strlen(title2));
     kos_text(600,8,0x90ffffff,title3,strlen(title3));*/
}

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

int main()          
{
	win.x = 100;
	win.y = 100;
	win.dx = 400;
	win.dy = 400;	 

	draw_window();

	cgl = kosglCreateContext( 0, 0);
	kosglMakeCurrent( 0, 0, win.dx, win.dy, 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(check_os_event())
		{
			case 1:
				draw_window();
				reshape();
				break;
					  
			case 2:	          
				   key = get_key();
				   switch(key.code) {
						case KEY_F:
							if(!FullScreen){									 
								skin=0x01;
								SysCall(67,0,0,SysCall(14)>>16,SysCall(14)&0xffff);
								draw_window();
								reshape();
								FullScreen = 1;
							}
							else{
								skin=0x34;
								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);
}