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 <IL/il.h>

#include <IL/ilu.h>

#include <CGLA/Vec2i.h>

#include <CGLA/Vec2f.h>

#include <CGLA/Vec3f.h>

#include <CGLA/Mat4x4f.h>

#include "glsl_shader.h"

#include "GLGraphics/gel_glut.h"

#include "GLGraphics/QuatTrackBall.h"

#include "GLGraphics/draw.h"

#include "Geometry/TriMesh.h"

#include "Geometry/obj_load.h"

#include "ply_load.h"

using namespace std;

using namespace CGLA;

using namespace Geometry;

using namespace GLGraphics;

namespace

{

	int win_size_x = 800;

	int win_size_y = 800;

	bool per_vertex_normals = 1;

	bool redo_display_list = 1;

	QuatTrackBall* ball;

	int spin_timer = 20;

	void spin(int x);

	int main_window;

	TriMesh mesh;

	bool load_image_into_texture(const std::string& name, GLuint& id)

	{

		unsigned char* image = 0;

		unsigned int bpp = 0;

		unsigned int size_x = 0;

		unsigned int size_y = 0;

		unsigned int load_size_x = 0;

		unsigned int load_size_y = 0;

		ILenum Error;

		ILuint  ImgId;

		static bool washere = false;

		if(!washere)

		{

			ilInit();

			iluInit();

			washere=true;

		}

		ilEnable(IL_CONV_PAL);

		ilEnable(IL_ORIGIN_SET);

		ilOriginFunc(IL_ORIGIN_LOWER_LEFT);

		ilGenImages(1, &ImgId);

		ilBindImage(ImgId);

		char* name_cstr = const_cast<char*>(name.c_str());

		if(!ilLoadImage(name_cstr))

		{

			cout << "could not load <" << name_cstr  << ">" << endl;

			return false;

		}

		load_size_x = ilGetInteger(IL_IMAGE_WIDTH);

		load_size_y = ilGetInteger(IL_IMAGE_HEIGHT);

		bpp = ilGetInteger(IL_IMAGE_BITS_PER_PIXEL);

		if (bpp==24)

			ilConvertImage(IL_RGB, IL_UNSIGNED_BYTE);

		else if (bpp==32)

			ilConvertImage(IL_RGBA, IL_UNSIGNED_BYTE);

		else if (bpp==8)

			ilConvertImage(IL_LUMINANCE, IL_UNSIGNED_BYTE);

		else

			assert(0);

		unsigned int i;

		for (i=2;i<=4096 ;i*=2)

			if (i>=load_size_x)

				break;

		size_x = i;

		for (i=2;i<=4096 ;i*=2)

			if (i>=load_size_y)

				break;

		size_y = i;

		if(size_x != load_size_x || size_y != load_size_y)

		{

			iluImageParameter(ILU_FILTER, ILU_BILINEAR);

			iluScale(size_x, size_y, 1);

		}

		const int image_size =size_x*size_y*ilGetInteger(IL_IMAGE_BYTES_PER_PIXEL);

		image = new unsigned char[image_size];

		memcpy(image, ilGetData(), image_size);

		ilDeleteImages(1, &ImgId);

		bool any_errors=false;

		while ((Error = ilGetError())) {

			cout << __LINE__ << "Error: " << iluErrorString(Error) << endl;

			any_errors = true;

		}

		if(any_errors) return false;

		GLint internalFormat=0;

		GLenum format=0;

		glGenTextures(1, &id);

		switch (bpp)

		{

			case 8:

				internalFormat =  GL_LUMINANCE;

				format = GL_LUMINANCE;

				break;

			case 24:

				internalFormat =  GL_RGB;

				format = GL_RGB;

				break;

			case 32:

				internalFormat =  GL_RGBA;

				format = GL_RGBA;

				break;

			default:

				return false;

		}

		glBindTexture(GL_TEXTURE_2D, id);

		glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, size_x, size_y, 0,

					 format, GL_UNSIGNED_BYTE, image);

		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);

		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

		return true;

	}

	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;

				GLuint tex_id;

				if(load_image_into_texture(name, tex_id))

					mat.tex_id = tex_id;

			}

		}

	}

	void toggle_wire()

	{

		static bool wire= false;

		static string shader_path = "/Users/jab/SrcTree/Appsrc/wireframepaper/";

		static GLhandleARB prog_P0;

		wire = !wire;

		static bool washere = false;

		if(!washere)

		{

			washere = true;

			// Create s	haders directly from file

			GLuint vs = create_glsl_shader(GL_VERTEX_SHADER, shader_path, "tri.vert");

			GLuint gs = create_glsl_shader(GL_GEOMETRY_SHADER_EXT, shader_path, "tri.geom");

			GLuint fs = create_glsl_shader(GL_FRAGMENT_SHADER, shader_path, "tri.frag");

			// Create the program

			prog_P0 = glCreateProgram();

			// Attach all shaders

			if(vs) glAttachShader(prog_P0, vs);

			if(gs) glAttachShader(prog_P0, gs);

			if(fs) glAttachShader(prog_P0, fs);

			// Specify input and output for the geometry shader. Note that this must be

			// done before linking the program.

			glProgramParameteriEXT(prog_P0,GL_GEOMETRY_INPUT_TYPE_EXT,GL_TRIANGLES);

			glProgramParameteriEXT(prog_P0,GL_GEOMETRY_VERTICES_OUT_EXT,3);

			glProgramParameteriEXT(prog_P0,GL_GEOMETRY_OUTPUT_TYPE_EXT,GL_TRIANGLE_STRIP);

			// Link the program object and print out the info log

			glLinkProgram(prog_P0);

		}

		if(wire)

		{

			glUseProgram(prog_P0);

			// Set the value of a uniform

			glUniform2f(glGetUniformLocation(prog_P0,"WIN_SCALE"), win_size_x/2.0, win_size_y/2.0);

		}

		else

			glUseProgram(0);		

	}

	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();

    glCallList(l);

    glutSwapBuffers();

}

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

{

    switch(key)

    {

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

		case 'w': toggle_wire(); break;

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

    }

}

}

int main(int argc, char** argv)

{

    // 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(argc>1)

        fn = argv[1];

    else

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

	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

	{

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

		exit(0);

	}		

    enable_textures(mesh);	

    if(!mesh.has_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);

    // Pass control to GLUT

    glutMainLoop();

    return 0;

}