翁驊成的學習筆記 week 06

week 06 實作

step 1.實作範例(打光)

#include <GL/glut.h>

#include "glm.h"

GLMmodel* pmodel = NULL;

void 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);  //3D深度測試，清depth buffer才能正確繪圖

    drawmodel();

    glutSwapBuffers();

}

GLfloat pos[] = { 0.0, 0.0, -1.0, 0.0 };   //打光(3)

int main(int argc, char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);  //3D深度測試，要準備好depth buffer記憶體

    glutCreateWindow("week06");

    glutDisplayFunc(display);

    glEnable(GL_DEPTH_TEST);   //3D深度測試，打開Enable

    glEnable(GL_LIGHTING);   //打光(2)，打開Enable

    glEnable(GL_LIGHT0);   //打光(1)，打開Enable

    glLightfv(GL_LIGHT0, GL_POSITION, pos);

    glutMainLoop();

}

step 2.實作範例(轉動+移動)

#include <stdio.h>

#include <GL/glut.h>

#include "glm.h"

GLMmodel* pmodel = NULL;

int rotateX=0,rotateY=0,rotateZ=0;

int oldx=0,oldy=0;

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

{

    printf("Now : %c (%d %d)\n",key,x,y);

    if(key=='1')rotateX++;

    if(key=='2')rotateY++;

    if(key=='3')rotateZ++;

    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)

    {

        oldx=x;

        oldy=y;

    }

}

void motion(int x,int y)

{

    rotateY += -(x-oldx);

    rotateX += -(y-oldy);
    oldx=x;

    oldy=y;

    glutPostRedisplay();

}

void 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);

    //drawmodel();

    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);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutKeyboardFunc(keyboard);

    glEnable(GL_DEPTH_TEST);

    glEnable(GL_LIGHTING);

    glEnable(GL_LIGHT0);

    glLightfv(GL_LIGHT0, GL_POSITION, pos);

    glutMainLoop();

}