在opengl中加入�光照的效果，可用键盘控制放大缩小

w键放大 s键缩小 d键开关灯

预览效果例如以下：

源代码例如以下：

#include <gl/glut.h>
#include <gl/glaux.h>
#include <stdio.h>
#pragma comment(lib, "opengl32.lib")
#pragma comment(lib, "glut32.lib")
#pragma comment(lib, "glu32.lib")
#pragma comment(lib, "glut.lib")
#pragma comment(lib, "glaux.lib")UINT g_bmp[1];//贴图编号GLfloat LightAmbient[] = { 0.5f, 0.5f, 0.5f, 1.0f }; //环境光參数，半亮白色
GLfloat LightDiffuse[] = { 1.0f, 1.0f, 1.0f, 1.0f }; //漫射光參数，
GLfloat LightPosition[] = { 0.0f, 0.0f, 0.0f, 1.0f }; //光源位置void Box(float x, float y, float z) //长方体
{glPushMatrix();glScalef(x, y, z);glEnable(GL_TEXTURE_2D); //贴图有效glBegin(GL_QUADS);glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);// 前glTexCoord2f(1.0f, 0.0f); glVertex3f(1.0f, -1.0f, 1.0f);glTexCoord2f(1.0f, 1.0f); glVertex3f(1.0f, 1.0f, 1.0f);glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);// 后glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);glTexCoord2f(0.0f, 1.0f); glVertex3f(1.0f, 1.0f, -1.0f);glTexCoord2f(0.0f, 0.0f); glVertex3f(1.0f, -1.0f, -1.0f);glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);// 上glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, 1.0f, 1.0f);glTexCoord2f(1.0f, 0.0f); glVertex3f(1.0f, 1.0f, 1.0f);glTexCoord2f(1.0f, 1.0f); glVertex3f(1.0f, 1.0f, -1.0f);glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -1.0f, -1.0f);// 下glTexCoord2f(0.0f, 1.0f); glVertex3f(1.0f, -1.0f, -1.0f);glTexCoord2f(0.0f, 0.0f); glVertex3f(1.0f, -1.0f, 1.0f);glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);glTexCoord2f(1.0f, 0.0f); glVertex3f(1.0f, -1.0f, -1.0f);// 左glTexCoord2f(1.0f, 1.0f); glVertex3f(1.0f, 1.0f, -1.0f);glTexCoord2f(0.0f, 1.0f); glVertex3f(1.0f, 1.0f, 1.0f);glTexCoord2f(0.0f, 0.0f); glVertex3f(1.0f, -1.0f, 1.0f);glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);// 右glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);glEnd();glDisable(GL_TEXTURE_2D);//取消贴图glPopMatrix();
}
bool LoadTexture(char *filename, GLuint &texture)
{AUX_RGBImageRec *pImage = auxDIBImageLoadA(filename); //装入位图if (pImage == NULL) return false;glGenTextures(1, &texture); //生成贴图glBindTexture(GL_TEXTURE_2D, g_bmp[0]); //贴图生效gluBuild2DMipmaps(GL_TEXTURE_2D, 4, pImage->sizeX, pImage->sizeY, GL_RGB, GL_UNSIGNED_BYTE, pImage->data); //贴图数据return true;
}
void init()
{LoadTexture("i:\\4.bmp", g_bmp[0]);glLightfv(GL_LIGHT1, GL_AMBIENT, LightAmbient); //设置环境光glLightfv(GL_LIGHT1, GL_DIFFUSE, LightDiffuse); //设置漫射光glLightfv(GL_LIGHT1, GL_POSITION, LightPosition); //设置光源位置glEnable(GL_LIGHT1); //启用一号光源glEnable(GL_LIGHTING); //开光
}float s = 1, r = 0; //放大缩小的倍数和旋转參数
void renderScene(void)
{glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);    // Clear The Screen And The Depth BufferglLoadIdentity();                                   // Reset The ViewglTranslatef(0.0f, 0.0f, -5);glRotatef(r, 1.0f, 1.0f, 0.0f);glScalef(s, s, s);Box(1, 1, 1);r += 0.01;//旋转glutSwapBuffers();
}
void changeSize(int w, int h)
{if (h == 0) h = 1;float ratio = 1.0* w / h;glMatrixMode(GL_PROJECTION);// 单位化投影矩阵。glLoadIdentity();glViewport(0, 0, w, h);// 设置视口大小为整个窗体大小gluPerspective(45, ratio, 1, 1000);// 设置正确的投影矩阵glMatrixMode(GL_MODELVIEW);//以下是设置模型视图矩阵glLoadIdentity();gluLookAt(0.0, 0.0, 5.0, 0.0, 0.0, -1.0, 0.0f, 1.0f, 0.0f);//设置观測点
}
int light = 1, bp = 0;
void keyfunc(unsigned char ch, int x, int y)
{if (ch == 'w') //发大缩小s += 0.1;else if (ch == 's')s -= 0.1;if (ch == 'd')//d键开关灯{if (light){light = 0;glDisable(GL_LIGHTING);printf("off\n");}else{light = 1;glEnable(GL_LIGHTING);printf("on\n");}}
}
int main(int argc, char * argv[])
{glutInit(&argc, argv);glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);glutInitWindowPosition(100, 100);glutInitWindowSize(320, 320);glutCreateWindow("Hello OpenGL");init();glutDisplayFunc(renderScene);glutIdleFunc(renderScene); //指定程序空暇时调用函数glutReshapeFunc(changeSize); //指定窗体形状变化时的回调函数glEnable(GL_DEPTH_TEST);glutKeyboardFunc(keyfunc);//键盘回调函数glutMainLoop();return 0;
}

所用贴图例如以下：