テクスチャ 
main.cpp
#include <GL/glut.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include "Texture.hpp"
float xrot, yrot, zrot;
TTexture *tex1;
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslatef(0.0f,0.0f,-5.0f);
glRotatef(xrot,1.0f,0.0f,0.0f);
glRotatef(yrot,0.0f,1.0f,0.0f);
glRotatef(zrot,0.0f,0.0f,1.0f);
glBindTexture(GL_TEXTURE_2D, tex1->ID);
glBegin(GL_QUADS);
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(0.0f, 1.0f); 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(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);
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);
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);
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);
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();
xrot+=0.0f;
yrot+=7.0f;
zrot+=0.0f;
glutSwapBuffers();
}
void onKeyboard(unsigned char key, int x, int y)
{
switch (key) {
case '\033':
exit(0);
default:
break;
}
}
void onMouse(int button, int state, int x, int y)
{
switch (button) {
case GLUT_LEFT_BUTTON:
break;
case GLUT_MIDDLE_BUTTON:
break;
case GLUT_RIGHT_BUTTON:
break;
default:
break;
}
}
void onReshape(int width, int height)
{
if (height==0) height=1;
if (width==0) width=1;
glViewport(0,0,width,height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0f,(GLfloat)width/(GLfloat)height,0.1f,100.0f);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void timer(int value)
{
glutPostRedisplay();
glutTimerFunc(30 , timer , 0);
}
void glInit(void)
{
glClearColor(0.9, 0.9, 0.9, 1.0);
glShadeModel(GL_SMOOTH);
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
}
void init()
{
tex1 = new TTexture("tartan1.bmp");
}
int main(int argc, char **argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH);
glutInitWindowSize(750,750);
int window = glutCreateWindow(argv[0]);
glutDisplayFunc(display);
glutReshapeFunc(onReshape);
glutMouseFunc(onMouse);
glutKeyboardFunc(onKeyboard);
glutTimerFunc(50 , timer , 0);
glInit();
init();
glutMainLoop();
delete tex1;
return 1;
}
Texture.hpp
#ifndef TEXTURE_H
#define TEXTURE_H
#include <stdio.h>
#include <stdlib.h>
#include <GL/gl.h>
#include <GL/glu.h>
// This program only 24bit Bitmap
class TTexture
{
public:
TTexture(char *fileName);
void init();
int width, height;
unsigned int ID;
private:
char *data;
};
TTexture::TTexture(char *fileName)
{
FILE *pFile = NULL;
unsigned short planeNum;
unsigned short BPPnum;
int i;
if( (pFile = fopen(fileName, "rb") ) == NULL )
printf("%s this file don't found\n",fileName);
fseek( pFile, 18, SEEK_CUR );
if( (i = fread(&width, 4, 1, pFile) ) != 1 )
printf("%s this file can't read width \n", fileName);
if( (i = fread(&height, 4, 1, pFile) ) != 1 )
printf("%s this file can't read height \n", fileName);
if( (fread(&planeNum, 2, 1, pFile) ) != 1 )
printf("%s this file can't read count of plane \n", fileName);
if( planeNum != 1 )
printf( "%s in this file count of plane is not 1: %u \n", fileName, planeNum );
if( (i = fread(&BPPnum, 2, 1, pFile)) != 1 )
printf( "%s this file can't read BPP\n", fileName );
if( BPPnum != 24 )
printf( "%s in this file BPP is not 24: %u\n", fileName, BPPnum );
fseek( pFile, 24, SEEK_CUR );
//this program is only 3*8=24 bit BMP file
int imagesize = (width * height) * 3;
data = (char*) malloc( imagesize );
if( (i = fread(data, imagesize, 1, pFile) ) != 1 )
printf("%s this file can't read data of image \n", fileName);
//bgr -> rgb
char charTmp;
for( i = 0; i < imagesize; i += 3 )
{
charTmp = data[i];
data[i] = data[i+2];
data[i+2] = charTmp;
}
char *tmpdata = (char*) malloc( imagesize );
for (i = 0; i < height; i++)
{
for (int j = 0; j < width*3; j+=3)
{
tmpdata[i*width*3 + j] = data[i*width*3 + j];
tmpdata[i*width*3 + j+1] = data[i*width*3 + j+1];
tmpdata[i*width*3 + j+2] = data[i*width*3 + j+2];
}
}
int tmph = 0;
for (i = 0; i < height; i++)
{
for (int j = 0; j < width*3; j+=3)
{
tmph = height - i;
data[i*width*3 + j] = tmpdata[tmph*width*3 + j];
data[i*width*3 + j+1] = tmpdata[tmph*width*3 + j+1];
data[i*width*3 + j+2] = tmpdata[tmph*width*3 + j+2];
}
}
free(tmpdata);
fclose(pFile);
init();
}
void TTexture::init()
{
glEnable(GL_TEXTURE_2D);
glGenTextures(1, &ID);
glBindTexture(GL_TEXTURE_2D, ID);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGB, width,
height, GL_RGB, GL_UNSIGNED_BYTE,
data);
}
#endif
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