孙其功陪你学之——opengl纹理贴图（例程）

本人亲测例程（Opengl宝典提供——略有修改），仅供学习参考

#include <glut.h>//此头文件需注意
#include "glext.h"//此头文件位置需注意
#include <math.h>
#ifndef M_PI
#  define M_PI 3.141592649
#endif /* !M_PI */
#include "bitmap.h"
#include "bitmap.c"
/*
 * Globals...
 */
int        Width;    /* Width of window */
int        Height;   /* Height of window */
BITMAPINFO *TexInfo; /* Texture bitmap information */
GLubyte    *TexBits; /* Texture bitmap pixel bits */
static GLfloat xRot = 0.0f;
static GLfloat yRot = 0.0f;
/*
 * Functions...
 */

void Redraw(void);
void Resize(int width, int height);
void SpecialKeys(int key, int x, int y)
{
if(key == GLUT_KEY_UP)
xRot-= 5.0f;
if(key == GLUT_KEY_DOWN)
xRot += 5.0f;
if(key == GLUT_KEY_LEFT)
yRot -= 5.0f;
if(key == GLUT_KEY_RIGHT)
yRot += 5.0f;
if(key > 356.0f)
xRot = 0.0f;
if(key < -1.0f)
xRot = 355.0f;
if(key > 356.0f)
yRot = 0.0f;
if(key < -1.0f)
yRot = 355.0f;
// Refresh the Window
glutPostRedisplay();
}
void SetupRC()
{
// Black background
glClearColor(1.0f, 0.0f, 1.0f, 1.0f );
// Set drawing color to green
//glColor3f(0.0f, 1.0f, 0.0f);
}
/*
 * 'main()' - Open a window and display a textured sky.
 */
int                /* O - Exit status */
main(int  argc,    /* I - Number of command-line arguments */
     char *argv[]) /* I - Command-line arguments */
    {
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH);
    glutInitWindowSize(792, 573);
    glutCreateWindow("冰心玉壶");
glutSpecialFunc(SpecialKeys);
    glutReshapeFunc(Resize);
    glutDisplayFunc(Redraw);
    TexBits = LoadDIBitmap("poot.bmp", &TexInfo);
SetupRC();
    glutMainLoop();
    return (0);
    }
/*
 * 'Redraw()' - Redraw the window...
 */
void
Redraw(void)
    {
    static GLfloat dark[4] = { 0.0, 0.0, 0.0, 1.0 };
    static GLfloat normal[4] = { 0.5, 0.5, 0.5, 1.0 };
    static GLfloat bright[4] = { 1.0, 1.0, 1.0, 1.0 };
    static GLfloat pos[4] = { -0.2588, 0.0, 0.9659, 0.0 };
    /* Clear the window */
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    /* Setup for drawing... */
    glDepthFunc(GL_LEQUAL);
    glEnable(GL_DEPTH_TEST);
    glEnable(GL_LIGHTING);
    glEnable(GL_LIGHT0);
   glPushMatrix();
    glTranslatef(0.0, 0.0, -50.0);
glRotatef(xRot, 1.0f, 0.0f, 0.0f);
glRotatef(yRot, 0.0f, 1.0f, 0.0f);
    /* First draw the pot without texturing and with specular highlights */
    glDisable(GL_BLEND);
    glDisable(GL_TEXTURE_2D);
    glLightModelfv(GL_LIGHT_MODEL_AMBIENT, dark);
    glLightfv(GL_LIGHT0, GL_DIFFUSE, dark);
    glLightfv(GL_LIGHT0, GL_SPECULAR, bright);
    glLightfv(GL_LIGHT0, GL_POSITION, pos);
    glMaterialfv(GL_FRONT, GL_AMBIENT, dark);
    glMaterialfv(GL_FRONT, GL_DIFFUSE, dark);
    glMaterialfv(GL_FRONT, GL_SPECULAR, bright);
    glMateriali(GL_FRONT, GL_SHININESS, 128);
    glColor3f(1.0, 1.0, 1.0);
    glutSolidTeapot(10.0);
    /* Define the 2D texture image. */
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexImage2D(GL_TEXTURE_2D, 0, 3, TexInfo->bmiHeader.biWidth,
                 TexInfo->bmiHeader.biHeight, 0, GL_BGR_EXT,
GL_UNSIGNED_BYTE, TexBits);
    /* Draw the teapot with texturing, adding the textured colors... */
    glBlendFunc(GL_ONE, GL_ONE);
    glEnable(GL_BLEND);
    glEnable(GL_TEXTURE_2D);
    glLightModelfv(GL_LIGHT_MODEL_AMBIENT, normal);
    glLightfv(GL_LIGHT0, GL_AMBIENT, normal);
    glLightfv(GL_LIGHT0, GL_DIFFUSE, normal);
    glLightfv(GL_LIGHT0, GL_SPECULAR, dark);
   glMaterialfv(GL_FRONT, GL_AMBIENT, normal);
    glMaterialfv(GL_FRONT, GL_DIFFUSE, normal);
    glMaterialfv(GL_FRONT, GL_SPECULAR, dark);
    glMateriali(GL_FRONT, GL_SHININESS, 0);
    glutSolidTeapot(10.0);
    glPopMatrix();
    glFinish();
    }
void
Resize(int width,  /* I - Width of window */
       int height) /* I - Height of window */
    {
    /* Save the new width and height */
    Width  = width;
    Height = height;
    /* Reset the viewport... */
    glViewport(0, 0, width, height);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(30.0, (float)width / (float)height, 0.1, 1000.0);
   glMatrixMode(GL_MODELVIEW);

}