OpenGL之路（六）贴图

来源：互联网发布：淘宝美工的职业规划编辑：程序博客网时间：2024/05/22 06:41
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 <gl/glut.h>#include <gl/glaux.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
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