/*	Public domain	*/
/*
 * This program demonstrates the use of the SG_View widget to
 * display a scene.
 */

#include <agar/core.h>
#include <agar/gui.h>
#include <agar/dev.h>
#include <freesg/sg.h>

#include <string.h>
#include <math.h>

AG_Timeout rotTimer;
SG_Ball *center;

static Uint32
Rotate(void *obj, Uint32 t, void *arg)
{
	SG_Camera *cam = arg;

	SG_Orbitvd(cam, M_VecZero3(), M_VecJ3(), 1.0);
	return (t);
}

static void
CreateWindow(void)
{
	AG_Window *win;
	SG_View *sv;
	AG_HBox *hb;
	SG_Ball *s1, *s2;
	SG_Light *lt;
	SG *sg;
	int i;
	M_Real angle = 60.0;

	/* Create a new scene graph. */
	sg = SG_New(NULL, "MyScene", 0);

	/* Display the object tree using the Agar-DEV VFS browser. */
	DEV_Browser(sg);

	/* Create a bunch of spheres. */
	s1 = center = SG_BallNew(sg->root, "Sphere A");
	for (i = 0; i < 60; i++) {
		s2 = SG_BallNew(s1, "Sphere B");
		s1 = s2;
		SG_Rotatev(s1, angle, M_VecJ3());
		SG_Translate(s1, 2.0, 0.4, 0.0);
		angle -= 0.4;
	}
	
	/* Create a new light source. */
	lt = SG_LightNew(sg->root, "MyLight");
	SG_Translate(lt, 5.0, 3.0, 2.0);
	lt->ambient = M_ColorRGB(0.0, 1.0, 0.0);  /* Set ambient color */
	lt->diffuse = lt->ambient;		  /* Set diffuse color */
	lt->Kc = 0.5;				  /* Set constant attenuation */
	lt->Kl = 0.05;				  /* Set linear attenuation */

	/* Create a window containing a SG_View widget. */
	win = AG_WindowNew(0);
	AG_WindowSetCaptionS(win, "Scene");
	sv = SG_ViewNew(win, sg, SG_VIEW_EXPAND);

	/* Move the default camera. */
	SG_Translate(sv->cam, 0.0, 15.0, 30.0);

	AG_WindowSetGeometryAlignedPct(win, AG_WINDOW_MC, 60, 40);
	AG_WindowShow(win);

	AG_SetTimeout(&rotTimer, Rotate, sv->cam, 0);
	AG_ScheduleTimeout(sv, &rotTimer, 10);
}

int
main(int argc, char *argv[])
{
	if (AG_InitCore("sgview-demo", 0) == -1) {
		fprintf(stderr, "%s\n", AG_GetError());
		return (1);
	}
	if (AG_InitGraphics("<OpenGL>") == -1) {
		fprintf(stderr, "%s\n", AG_GetError());
		return (-1);
	}
	SG_InitSubsystem();
	DEV_InitSubsystem(0);

	/* Set some useful hotkeys */
	AG_BindGlobalKey(AG_KEY_ESCAPE, AG_KEYMOD_ANY, AG_Quit);
	AG_BindGlobalKey(AG_KEY_F8, AG_KEYMOD_ANY, AG_ViewCapture);
	
	CreateWindow();
	AG_EventLoop();
	return (0);
}