Subversion Repositories gelsvn

// ----------------------------------------

// A simple OBJ viewer.

//

// Controls:

// - left mouse down + mouse motion : rotate

// - Scroll button and +- buttons   : zoom

// - right mouse click              : centre trackball

// - esc                            : exits

// - x,y,z buttons                  : switch trackball up axis

// ----------------------------------------

#if (_MSC_VER >= 1200)

#pragma warning (disable: 4786)

#endif

#include <list>

#include <vector>

#include <assert.h>

#include <stdio.h>

#ifdef WIN32

#include <windows.h>

#include <io.h>

#endif

#include <string.h>

#include <stdlib.h>

#include <iostream>

#include <Util/ArgExtracter.h>

#include <CGLA/Vec2i.h>

#include <CGLA/Vec2f.h>

#include <CGLA/Vec3f.h>

#include <CGLA/Mat4x4f.h>

#include "GLGraphics/glsl_shader.h"

#include "GLGraphics/gel_glut.h"

#include "GLGraphics/QuatTrackBall.h"

#include "GLGraphics/draw.h"

#include "GLGraphics/SOIL.h"

#include "Geometry/TriMesh.h"

#include "Geometry/obj_load.h"

#include "Geometry/ply_load.h"

#include "HMesh/x3d_load.h"

#include "HMesh/FaceCirculator.h"

#include "wireframe.h"

using namespace std;

using namespace CGLA;

using namespace Geometry;

using namespace HMesh;

using namespace GLGraphics;

int win_size_x = 800;

int win_size_y = 800;

bool per_vertex_normals = 1;

bool redo_display_list = 1;

bool do_wireframe = false;

Vec3f line_col = Vec3f(1,0,0);

QuatTrackBall* ball;

int spin_timer = 20;

void spin(int x);

int main_window;

TriMesh mesh;

void enable_textures(TriMesh& tm)

{

	for(unsigned int i=0;i<tm.materials.size(); ++i)

	{

		Material& mat = tm.materials[i];

		if(mat.tex_name != "")

		{

			string name = mat.tex_path + mat.tex_name;

			mat.tex_id = SOIL_load_OGL_texture(name.data(), 0, 0, SOIL_FLAG_TEXTURE_REPEATS | SOIL_FLAG_INVERT_Y | SOIL_FLAG_POWER_OF_TWO);

		}

	}

}

void load_mesh(const string& fn)

{

	if(fn.substr(fn.length()-4,fn.length())==".obj")

	{

		obj_load(fn, mesh);

	}

	else if(fn.substr(fn.length()-4,fn.length())==".ply")

	{

		ply_load(fn, mesh);

	}	

	else if(fn.substr(fn.length()-4,fn.length())==".x3d")

	{

		Manifold m;

		x3d_load(fn, m);

		for(VertexIter v=m.vertices_begin(); v != m.vertices_end();++v)

			v->touched = mesh.geometry.add_vertex(v->pos);

		for(FaceIter f = m.faces_begin(); f!= m.faces_end(); ++f)

		{

			Vec3i face;

			int i=0;

			for(FaceCirculator fc(f); !fc.end(); ++fc,++i)

			{

				if(i<2)

					face[i] = fc.get_vertex()->touched;

				else

				{

					face[2] = fc.get_vertex()->touched;

					mesh.geometry.add_face(face);

					face[1] = face[2];

				}

			}	

		}

	}

	else

	{

		cout << "Either the format was unrecognized or the file did not have the appropriate extension" << endl;

		exit(0);

	}

	enable_textures(mesh);	

}

bool depth_pick(int x, int y,Vec3f& wp)

{

	// Enquire about the viewport dimensions

	GLint viewport[4];

	glGetIntegerv(GL_VIEWPORT, viewport);

	// Get the minimum and maximum depth values.

	float minmax_depth[2];

	glGetFloatv(GL_DEPTH_RANGE, minmax_depth);

	// Read a single pixel at the position of the mouse cursor.

	float depth;

	glReadPixels(x, viewport[3]-y, 1,1, GL_DEPTH_COMPONENT,

				 GL_FLOAT, (void*) &depth);

	// If the depth corresponds to the far plane, we clicked on the

	// background.

	if(depth == minmax_depth[1])

		return false;

	// The lines below copy the viewing transformation from OpenGL

	// to local variables. The call to gluLookAt must have exactly

	// the same parameters as when the scene is drawn.

	glLoadIdentity();

	ball->set_gl_modelview();

	double mvmat[16];

	glGetDoublev(GL_MODELVIEW_MATRIX, mvmat);

	// Copy the projection matrix. We assume it is unchanged.

	double prjmat[16];

	glGetDoublev(GL_PROJECTION_MATRIX, prjmat);

	// Now unproject the point from screen to world coordinates.

	double ox, oy, oz;

	gluUnProject(x,viewport[3]-y,depth,

				 mvmat,prjmat,viewport,

				 &ox, &oy, &oz);

	wp = Vec3f(ox,oy,oz);

	return true;

}

void mouse_motion(int x, int y)

{

    ball->roll_ball(Vec2i(x,y));

}

void mouse(int btn, int state, int x, int y)

{

	if(state == GLUT_DOWN) 

	{

		if(btn == GLUT_LEFT_BUTTON) 

			ball->grab_ball(ROTATE_ACTION, Vec2i(x,y));

		else if(btn == GLUT_MIDDLE_BUTTON) 

			ball->grab_ball(ZOOM_ACTION, Vec2i(x, y));

		else if(btn == GLUT_RIGHT_BUTTON) 

			ball->grab_ball(PAN_ACTION, Vec2i(x, y));

	}

	else if(state == GLUT_UP)

		ball->release_ball();	

}

void spin(int x)

{

	ball->do_spin();

	glutTimerFunc(spin_timer, spin, 0);  

	glutPostRedisplay();

}

void display()

{

	static unsigned int l;

    if(redo_display_list)

    {

        cout << "Creating display list" << endl;

        l = glGenLists(1);

        glNewList(l, GL_COMPILE);

        draw(mesh, per_vertex_normals);

        glEndList();

        redo_display_list = false;

		glutTimerFunc(spin_timer, spin, 0);	

	}

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glLoadIdentity();

    ball->set_gl_modelview();

	if(do_wireframe)

	{

		if(GLEW_EXT_geometry_shader4)

		{

			enable_wireframe();

			glCallList(l);

			glUseProgram(0);

		}

		else

		{

			glDisable(GL_LIGHTING);

			glColor3f(1,1,1);

			glCallList(l);

			glEnable(GL_POLYGON_OFFSET_LINE);

			glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);

			glColor3fv(line_col.get());

			glPolygonOffset(0,-5);

			glCallList(l);

			glEnable(GL_LIGHTING);

			glDisable(GL_POLYGON_OFFSET_LINE);

			glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);

		}

	}

	else

		glCallList(l);

    glutSwapBuffers();

}

void keyboard(unsigned char key, int x, int y)

{

    switch(key)

    {

		case '\033': exit(0); break;

		case 'w': do_wireframe = !do_wireframe; break;

		case 'f': per_vertex_normals = !per_vertex_normals; redo_display_list = true; break;

    }

}

int main(int argc, char** argv)

{

	Util::ArgExtracter ae(argc, argv);

	bool redo_normals = ae.extract("-n");

    // GLUT INIT

    glutInitDisplayMode(GLUT_RGBA|GLUT_DOUBLE|GLUT_DEPTH);

    glutInitWindowSize(win_size_x, win_size_y);

    glutInit(&argc, argv);

    main_window = glutCreateWindow("OBJ Viewer");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMotionFunc(mouse_motion);

    glutMouseFunc(mouse);

    //glutIdleFunc(idle);

	glewInit();

    // GL INIT

    glClearColor(.8f, 0.9f, 1.0f, 0.f);

    glEnable(GL_DEPTH_TEST);

    glEnable(GL_LIGHTING);

    glEnable(GL_LIGHT0);

    glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, 1);

    glShadeModel(GL_SMOOTH);

    // LOAD OBJ

    string fn;

    if(ae.no_remaining_args())

        fn = ae.get_last_arg();

    else

        fn = "../../data/head.obj";

	load_mesh(fn);	

	if(!mesh.has_normals() || redo_normals)

	{

		cout << "Computing normals" << endl;

		mesh.compute_normals();

	}

	// Initialize Trackball

	Vec3f c;

	float r;

	mesh.get_bsphere(c,r);

	r *= 1.5;

	ball = new QuatTrackBall(c,r,800,800);

	// Setup projection

	glMatrixMode(GL_PROJECTION);

	glLoadIdentity();

	gluPerspective(53,1.0f,r/100.0,r*3.0);

	glMatrixMode(GL_MODELVIEW);

	if(GLEW_EXT_geometry_shader4)

		initialize_wireframe_shaders();

	// Pass control to GLUT

	glutMainLoop();

	return 0;

}