#include <GL/glut.h>
#include "glm.h"
GLMmodel* pmodel = NULL;
/*打光陣列開始*/
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 };/*改了光的方向*/
 
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 };
/*打光陣列結束*/
float angle=0;///自動旋轉A
void display(){
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    /*glutSolidTeapot(0.3);茶壺*/
    angle+=0.1;///自動旋轉B，這行要在Matrix外面
    glPushMatrix();
        glScalef(5,5,5);/*縮放*/
        glRotatef(angle,0,1,0);///自動旋轉C
        if (!pmodel) {
        pmodel = glmReadOBJ("data/chair.obj");/*讀我自己的模型*/
        if (!pmodel) exit(0);
        glmUnitize(pmodel);
        glmFacetNormals(pmodel);
        glmVertexNormals(pmodel, 90.0);
        }
 
        glmDraw(pmodel, GLM_SMOOTH|GLM_MATERIAL);/*要有material才會有顏色*/
 
    glPopMatrix();
 
    glutSwapBuffers();
}
int main(int argc,char **argv){
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
    glutCreateWindow("GLUT");
    ///glutDisplayFunc(display);這行要移到mainloop面前
    /*打光開始*/
    glClearColor(1,1,1,1);
    /*glEnable(GL_CULL_FACE);///這行要拿掉才不會很透光*/
    glCullFace(GL_BACK);
 
    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);
    /*打光結束*/
    glutDisplayFunc(display);///自動旋轉D
    glutIdleFunc(display);///自動旋轉E
    glutMainLoop();
}