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 <CGLA/Vec2i.h>

#include <CGLA/Vec2f.h>

#include <IL/il.h>

#include <IL/ilu.h>

#include <CGLA/Vec3f.h>

#include <CGLA/Mat4x4f.h>

#include "GLGraphics/gel_glut.h"

#include "GLGraphics/SimpleTrackBall.h"

#include "GLGraphics/draw.h"

#include "Geometry/TriMesh.h"

#include "Geometry/obj_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;

SimpleTrackBall* ball;

int main_window;

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;

				}

    }

}

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->gl_view();

    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;

}

TriMesh mesh;

void mouse_motion(int x, int y)

{

    ball->roll(x,y);

}

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

{

    if(button==GLUT_RIGHT_BUTTON && state==GLUT_DOWN)

    {

        Vec3f p;

        if(depth_pick(x, y, p))

            ball->set_center(p);

    }

    else if(button==3)

        ball->farther();

    else if(button==4)

        ball->closer();

}

void idle()

{

    if ( glutGetWindow() != main_window )

        glutSetWindow(main_window);

    glutPostRedisplay();

}

void display()

{

    static bool washere = false;

    static unsigned int l;

    if(!washere)

    {

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

        l = glGenLists(1);

        glNewList(l, GL_COMPILE);

        draw(mesh);

        glEndList();

        washere = true;

    }

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glLoadIdentity();

    ball->gl_view();

    glCallList(l);

    glutSwapBuffers();

}

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

{

    switch(key)

    {

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

    case '+': ball->closer(); break;

    case '-': ball->farther(); break;

    default:

        ball->up_axis(key);

    }

}

}

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);

    // 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";

    cout << "Loading " << fn << endl;

    if(fn == "") exit(0);

    obj_load(fn, mesh);

    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 SimpleTrackBall(c,r);

    // Setup projection

    glMatrixMode(GL_PROJECTION);

    glLoadIdentity();

    gluPerspective(53,1.0f,r/100,r*3);

    glMatrixMode(GL_MODELVIEW);

    // Pass control to GLUT

    glutMainLoop();

    return 0;

}