Note by Jack Week13

讀入OBJ

#include <GL/glut.h>

#include "glm.h"

GLMmodel *pmodelA=NULL;///身體, Al.obj

GLMmodel *pmodelB=NULL;///手臂, porsche.obj

GLMmodel *pmodelC=NULL;///手臂, porsche.obj

GLMmodel *pmodelD=NULL;

GLMmodel *pmodelE=NULL;

const GLfloat light_ambient[]  = { 0.0f, 0.0f, 0.0f, 1.0f };

const GLfloat light_diffuse[]  = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat light_position[] = { 2.0f, 5.0f, -5.0f, 0.0f };

const GLfloat mat_ambient[]    = { 0.7f, 0.7f, 0.7f, 1.0f };

const GLfloat mat_diffuse[]    = { 0.8f, 0.8f, 0.8f, 1.0f };

const GLfloat mat_specular[]   = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat high_shininess[] = { 100.0f };

void drawBody()

{

    if(pmodelA==NULL){

        pmodelA=glmReadOBJ("AL.obj");///執行目錄裡,有個Al.obj檔+Al.mtl檔

        glmUnitize(pmodelA);///設成單位大小

        glmFacetNormals(pmodelA);///重算(面)法向量

        glmVertexNormals(pmodelA, 90);///重算(點)法向量

    }///讀完OBJ,且設好了...

    glPushMatrix();

        glRotatef(180, 0,1,0);///對Y轉180度,向正面

        glmDraw(pmodelA, GLM_SMOOTH | GLM_MATERIAL);

    glPopMatrix();

}

void drawArm()

{

    if(pmodelB==NULL)

    {

        pmodelB=glmReadOBJ("porsche.obj");

        glmUnitize(pmodelB);

        glmFacetNormals(pmodelB);

        glmVertexNormals(pmodelB, 90);

    }

    

    glPushMatrix();

        glRotatef(90, 0,1,0);

        glScalef(0.3, 0.3, 0.3);

        glmDraw(pmodelB, GLM_SMOOTH | GLM_MATERIAL);

    glPopMatrix();

}

int angle[4]={30,30,30,30};///每個關節角度,都希望可以自己動///TODO4

int angleID=0;///現在在動第???個關節 ///TODO4 決定用 keyboard 來幫我們切換關節的ID

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    ///glutSolidSphere(0.1, 30,30);///原點、圓心

    drawBody();

    glPushMatrix();///右手臂

        glTranslatef(0.5, 0.4, 0);///第3個T

        glRotatef(angle[0], 0,0,1);///第2個R///TODO4

        glTranslatef(0.3, 0, 0);///第1個T

        drawArm();///右上手臂

        glPushMatrix();

            glTranslatef(0.25, 0, 0);///第3個T

            glRotatef(angle[1], 0,0,1);///第2個R///TODO4

            glTranslatef(0.3, 0, 0);///第1個T

            drawArm();///右下手臂

        glPopMatrix();

    glPopMatrix();

    glPushMatrix();///左手臂

        glTranslatef(-0.5, 0.4, 0);///第3個T

        glRotatef(angle[2], 0,0,1);///第2個R///TODO4

        glTranslatef(-0.3, 0, 0);///第1個T

        drawArm();///左上手臂

        glPushMatrix();

            glTranslatef(-0.25, 0, 0);///第3個T

            glRotatef(angle[3], 0,0,1);///第2個R ///TODO4

            glTranslatef(-0.3, 0, 0);///第1個T

            drawArm();///左下手臂

        glPopMatrix();

    glPopMatrix();

    glutSwapBuffers();

}

int oldX, oldY;

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

{///TODO3:

    oldX=x;

}

void motion(int x, int y)///TODO3:

{///TODO3:

    angle[angleID] += (x-oldX);///TODO4

    oldX=x;///TODO3:

    glutPostRedisplay();///TODO3:

}

void keyboard(unsigned char key, int x, int y)///TODO4

{///TODO4

    if(key=='0') angleID=0;///TODO4

    if(key=='1') angleID=1;///TODO4

    if(key=='2') angleID=2;///TODO4

    if(key=='3') angleID=3;///TODO4

}

int main(int argc, char **argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("GLUT Shapes");

    glutDisplayFunc(display);

    glutMotionFunc(motion);///TODO3:

    glutMouseFunc(mouse);///TODO3:

    glutKeyboardFunc(keyboard);///TODO4:

    glEnable(GL_DEPTH_TEST);

    glDepthFunc(GL_LESS);

    glEnable(GL_LIGHT0);

    glEnable(GL_NORMALIZE);

    glEnable(GL_COLOR_MATERIAL);

    glEnable(GL_LIGHTING);

    glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);

    glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);

    glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);

    glLightfv(GL_LIGHT0, GL_POSITION, light_position);

    glMaterialfv(GL_FRONT, GL_AMBIENT,   mat_ambient);

    glMaterialfv(GL_FRONT, GL_DIFFUSE,   mat_diffuse);

    glMaterialfv(GL_FRONT, GL_SPECULAR,  mat_specular);

    glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);

    glutMainLoop();

}