/***
*
*	Copyright (c) 1998, Valve LLC. All rights reserved.
*
****/
// updates:
// 1-4-98	fixed initialization

#include <stdio.h>

#include <windows.h>

#include <gl\gl.h>
#include <gl\glu.h>
#include <gl\glut.h>

#include "mathlib.h"
#include "..\..\engine\studio.h"
#include "mdlviewer.h"


#pragma warning( disable : 4244 ) // conversion from 'double ' to 'float ', possible loss of data
#pragma warning( disable : 4305 ) // truncation from 'const double ' to 'float '

vec3_t		g_vright;		// needs to be set to viewer's right in order for chrome to work
float		g_lambert = 1.5;

float		gldepthmin = 0;
float		gldepthmax = 10.0;


/*
=============
R_Clear
=============
*/
void R_Clear (void)
{
	glDepthFunc (GL_LEQUAL);
	glDepthRange (gldepthmin, gldepthmax);
	glDepthMask( 1 );
}

static StudioModel tempmodel;

void mdlviewer_display( )
{
	R_Clear( );

	tempmodel.SetBlending( 0, 0.0 );
	tempmodel.SetBlending( 1, 0.0 );

	static float prev;
	float curr = GetTickCount( ) / 1000.0;
	tempmodel.AdvanceFrame( curr - prev );
	prev = curr;

	tempmodel.DrawModel( );
}


void mdlviewer_init( char *modelname )
{
	// make a bogus texture
	// R_InitTexture( );

	tempmodel.Init( modelname );
	tempmodel.SetSequence( 0 );

	tempmodel.SetController( 0, 0.0 );
	tempmodel.SetController( 1, 0.0 );
	tempmodel.SetController( 2, 0.0 );
	tempmodel.SetController( 3, 0.0 );
	tempmodel.SetMouth( 0 );

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(50.,1.,.1,10.);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();

    glClearColor( 0, 0, 0.5, 0 );
}


void mdlviewer_nextsequence( void )
{
	int iSeq = tempmodel.GetSequence( );
	if (iSeq == tempmodel.SetSequence( iSeq + 1 ))
	{
		tempmodel.SetSequence( 0 );
	}
}


//////////////////////////////////////////////////////////////////


static int pstyle;
static int translate = 1;
static int mesh = 1;
static float transx = 0, transy = 0, transz = -2, rotx=235, roty=-90;
static float amplitude = 0.03;
static float freq = 5.0f;
static float phase = .00003;
static int ox = -1, oy = -1;
static int show_t = 1;
static int mot;
#define PAN	1
#define ROT	2
#define ZOOM 3

void pan(int x, int y) 
{
    transx +=  (x-ox)/500.;
    transy -= (y-oy)/500.;
    ox = x; oy = y;
    glutPostRedisplay();
}

void zoom(int x, int y) 
{
    transz +=  (x-ox)/20.;
    ox = x;
    glutPostRedisplay();
}

void rotate(int x, int y) 
{
    rotx += x-ox;
    if (rotx > 360.) rotx -= 360.;
    else if (rotx < -360.) rotx += 360.;
    roty += y-oy;
    if (roty > 360.) roty -= 360.;
    else if (roty < -360.) roty += 360.;
    ox = x; oy = y;
    glutPostRedisplay();
}

void motion(int x, int y) 
{
    if (mot == PAN) 
		pan(x, y);
    else if (mot == ROT) 
		rotate(x,y);
	else if ( mot == ZOOM )
		zoom( x, y );
}

void mouse(int button, int state, int x, int y) 
{
    if(state == GLUT_DOWN) {
	switch(button) {
	case GLUT_LEFT_BUTTON:
	    mot = PAN;
	    motion(ox = x, oy = y);
	    break;
	case GLUT_RIGHT_BUTTON:
		mot = ROT;
	    motion(ox = x, oy = y);
	    break;
	case GLUT_MIDDLE_BUTTON:
	    break;
	}
    } else if (state == GLUT_UP) {
	mot = 0;
    }
}

void help(void) 
{
    printf("left mouse     - pan\n");
    printf("right mouse    - rotate\n");
}

void init( char *arg ) 
{
	mdlviewer_init( arg );

    glEnable(GL_TEXTURE_2D);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(50.,1.,.1,10.);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    // glTranslatef(0.,0.,-5.5);
    // glTranslatef(-.2.,1.0,-1.5);

    glClearColor( 0, 0, 0.5, 0 );
}

void display(void) 
{
    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );

    glPushMatrix();

    glTranslatef(transx, transy, transz);
    
	glRotatef(rotx, 0., 1., 0.);
    glRotatef(roty, 1., 0., 0.);

    glScalef( 0.01, 0.01, 0.01 );
	glCullFace( GL_FRONT );
	glEnable( GL_DEPTH_TEST );

	mdlviewer_display( );

    glPopMatrix();
    glutSwapBuffers();

    glutPostRedisplay();
}

void reshape(int w, int h) 
{
    glViewport(0, 0, w, h);
}

/*ARGSUSED1*/
void key(unsigned char key, int x, int y) 
{
    switch(key) 
	{
		case 'h': 
			help(); 
		break;

		case 'p':
			printf("Translation: %f, %f %f\n", transx, transy, transz );
		break;

		case '\033':	// Escape
			exit(EXIT_SUCCESS); 
		break;

		case ' ':
			mdlviewer_nextsequence( );
		break;

		default: 
		break;
    }
    glutPostRedisplay();
}

int main(int argc, char** argv) 
{
	if (argc != 2)
	{
		printf("usage : %s <filename>\n", argv[0] );
		exit(1);
	}

    glutInitWindowSize(512, 512);
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGBA|GLUT_DOUBLE);
    (void)glutCreateWindow(argv[0]);
    init( argv[1] );
    glutDisplayFunc(display);
    glutKeyboardFunc(key);
    glutReshapeFunc(reshape);
    glutMouseFunc(mouse);
    glutMotionFunc(motion);
    glutMainLoop();
    return 0;
}