OpenGL之路（六）贴图-白红宇

OpenGL之路（六）贴图

阅读量：4701 次

发布时间：2019-06-09

本文共 3426 字，大约阅读时间需要 11 分钟。

给物体贴上图片，图片宽高要为2的幂次

代码如下（有的编译器不自带glaux，可以百度搜索进行配置，如有问题可进QQ群 116920287 咨询）

#include 
    
     #include 
     
      #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GLUquadricObj *g_text;//贴图指针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 LoadT8(char *filename, GLuint &texture){	AUX_RGBImageRec *pImage = NULL;	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	free(pImage->data);//释放位图内存	free(pImage);	return true;}void renderScene(void){	static float i = 0;	i += 0.01f;	if (i > 360) i = 0;	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);	glLoadIdentity();		glTranslatef(0, 0, -1.5);	glRotatef(i, 1, 1, 1);	Box(0.3f, 0.3f, 0.3f);	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口大小	gluPerspective(45, ratio, 1, 1000);// 设置正确的投影矩阵	glMatrixMode(GL_MODELVIEW);//下面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);//设置观测点}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");	glutDisplayFunc(renderScene);	glutIdleFunc(renderScene); //指定程序空闲时调用函数	glutReshapeFunc(changeSize); //指定窗口形状变化时的回调函数	glEnable(GL_DEPTH_TEST);	g_text = gluNewQuadric(); //申请贴图缓存	LoadT8("1.bmp", g_bmp[0]);	glutMainLoop();	return 0;}

图片如下 1.bmp