施宇修的學習筆記week06

#include <GL/glut.h>
#include<stdio.h>
#include "glm.h"
GLMmodel* pmodel = NULL;
int rotateX=0,rotateY=0,rotateZ=0;///旋轉軸
int oldX=0,oldY=0;///舊的座標
void keyboard(unsigned char key,int x,int y){
    printf("now : %c , (%d ,%d)\n",key,x,y);
    if(key=='1')rotateX++;///控制旋轉的方向
    else if(key=='2')rotateY++;
    else if(key=='3')rotateZ++;
    glutPostRedisplay();///立即更新畫面

}
void motion(int x,int y){
    rotateY+=-(x-oldX);///Y軸方向旋轉
    rotateX+=-(y-oldY);///X軸方向旋轉
    oldX=x;oldY=y;///更新座標
    glutPostRedisplay();
}
void mouse(int button,int state,int x,int y){
    printf("button: %d state: %d (%d %d)\n",button,state,x,y);
    if(state==GLUT_DOWN){///點下滑鼠
        oldX=x,oldY=y;
    }
}
drawmodel(void)
{
    if (!pmodel) {
pmodel = glmReadOBJ("data/al.obj");
if (!pmodel) exit(0);
glmUnitize(pmodel);
glmFacetNormals(pmodel);
glmVertexNormals(pmodel, 90.0);
    }

    glmDraw(pmodel, GLM_SMOOTH | GLM_MATERIAL);
}
void display()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glPushMatrix();
    glRotatef(rotateX,1,0,0);
    glRotatef(rotateY,0,1,0);
    glRotatef(rotateZ,0,0,1);
    drawmodel();
    glPopMatrix();
    glutSwapBuffers();
}
GLfloat pos[] = { 0.0, 0.0, -1.0, 0.0 };
int main(int argc, char**argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week06");
    glutDisplayFunc(display);
    glutKeyboardFunc(keyboard);
    glutMouseFunc(mouse);///註冊mouse
    glutMotionFunc(motion);///註冊motion

    glEnable(GL_LIGHTING);
    glEnable(GL_LIGHT0);
    glLightfv(GL_LIGHT0, GL_POSITION, pos);
    glEnable(GL_DEPTH_TEST);




    glutMainLoop();
}