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#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();
}
int angle[4]={30,30,30,30};
int angleID=0;
void drawArm()
{
    if(pmodelB==NULL){
        pmodelB=glmReadOBJ("porsche.obj");
        glmUnitize(pmodelB);
        glmFacetNormals(pmodelB);
        glmVertexNormals(pmodelB, 90);
    }
    glPushMatrix();
        glRotatef(90, 0,1,0);
        glScalef(0.5, 0.5, 0.5);
        glmDraw(pmodelB, GLM_SMOOTH | GLM_MATERIAL);
    glPopMatrix();
}
void display()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    drawBody();
    glPushMatrix();
        glTranslatef(0.5, 0.4, 0);///第3個T
        glRotatef(angle[0], 0,0,1);///第2個R
        glTranslatef(0.3, 0,0);///第1個T
        drawArm();
        glPushMatrix();
            glTranslatef(0.25, 0, 0);///第3個T
            glRotatef(angle[1], 0,0,1);///第2個R
            glTranslatef(0.3, 0,0);///第1個T
            drawArm();
        glPopMatrix();
    glPopMatrix();

    glPushMatrix();
        glTranslatef(-0.5, 0.4, 0);///第3個T
        glRotatef(angle[2], 0,0,1);///第2個R
        glTranslatef(-0.3, 0,0);///第1個T
        drawArm();
        glPushMatrix();
            glTranslatef(-0.25, 0, 0);///第3個T
            glRotatef(angle[3], 0,0,1);///第2個R
            glTranslatef(-0.3, 0,0);///第1個T
            drawArm();
        glPopMatrix();
    glPopMatrix();
    glutSwapBuffers();
}
int oldX , oldY;
void mouse(int button,int state,int x,int y)
{
    oldX=x;
}
void motion (int x,int y)
{
    angle[angleID] += (x-oldX);
    oldX=x;
    glutPostRedisplay();
}
void keyboard(unsigned char key,int x,int y)
{
    if(key=='0') angleID=0;
    if(key=='1') angleID=1;
    if(key=='2') angleID=2;
    if(key=='3') angleID=3;
}
int main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("GLUT Shapes");

    glutKeyboardFunc(keyboard);
    glutMotionFunc(motion);
    glutMouseFunc(mouse);
    glutDisplayFunc(display);

    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();
}