最終更新: mikk_ni3_92 2007年11月26日(月) 09:59:25履歴
現在地 >> メニュー >> サンプルコード::OpenGL >> テクスチャ作成 >> C++によるテクスチャ作成
#include <cstdio>
#include <cstdlib>
#include <fstream>
#include <GL/glut.h>
#include <GL/gl.h>
void display();
void reshape(int w, int h);
void timer(int value);
void DRAW_SQU();
using namespace std;
/*****[テクスチャ用]*****/
GLuint texture[1];
/*****[イメージ構造体+イメージ型]*****/
typedef struct Image
{
unsigned long sizeX;
unsigned long sizeY;
char *data;
}Image;
/****[画像読み込み]**************/
int ImageLoad(char *filename, Image *image)
{
fstream file(filename,ios::in|ios::binary);
if(file.fail())
{
printf("%s: Can't Open.",filename);
std::exit(1);
}
file.seekg(18,ios::cur);
file.read((char*)(&image->sizeX),4);
if( file.bad() )
{
printf("Error reading width from %s.\n", filename);
return 0;
}
file.read((char*)(&image->sizeY),4);
if( file.bad() )
{
printf("Error reading height from %s.\n", filename);
return 0;
}
unsigned long size;
size = image->sizeX * image->sizeY * 3;
unsigned short int planes;
file.read((char*)&planes,2);
if( file.bad() )
{
printf("Error reading planes from %s.\n", filename);
return 0;
}
if (planes != 1)
{
printf("Planes from %s is not 1: %u\n", filename, planes);
return 0;
}
unsigned short int bpp;
file.read((char*)&bpp,2);
if( file.bad() )
{
printf("Error reading bpp from %s.\n", filename);
return 0;
}
if (bpp != 24)
{
printf("Bpp from %s is not 24: %u\n", filename, bpp);
return 0;
}
file.seekg(24,ios::cur);
try
{
image->data = new char[size];
}
catch(std::bad_alloc)
{
printf("Error allocating memory for color-corrected image data");
return 0;
}
file.read(image->data,size);
if( file.bad() )
{
printf("Error reading image data from %s.\n", filename);
return 0;
}
char temp;
for (unsigned long i=0;i<size;i+=3) {
temp = image->data[i];
image->data[i] = image->data[i+2];
image->data[i+2] = temp;
}
return 1;
}
/*****[テクスチャ読み込み]******************/
void LoadGLTextures()
{
Image *image1;
try
{
image1 = new Image;
}
catch(std::bad_alloc)
{
printf("Error allocating space for image");
std::exit(0);
}
if (!ImageLoad("test2.bmp", image1))
{
std::exit(1);
}
/******* [テクスチャのバインド] ****************/
glGenTextures(1, &texture[0]);
glBindTexture(GL_TEXTURE_2D, texture[0]);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
gluBuild2DMipmaps(GL_TEXTURE_2D, 3, image1->sizeX,image1->sizeY, GL_RGB,GL_UNSIGNED_BYTE, image1->data);
delete [] image1->data;
delete(image1);
};
inline void GLUT_INIT()
{
glutInitDisplayMode(GLUT_RGBA| GLUT_DOUBLE | GLUT_DEPTH);
}
inline void GLUT_CALL_FUNC()
{
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutTimerFunc(100,timer,0);
}
inline void MY_INIT()
{
glClearColor(1.0, 1.0, 1.0, 1.0);
LoadGLTextures();
}
int main(int argc, char **argv)
{
glutInit(&argc,argv);
GLUT_INIT();
glutCreateWindow("window name");
GLUT_CALL_FUNC();
MY_INIT();
glutMainLoop();
return 0;
}
/********[ここから、コールバック]****************************************/
void display()
{
static int r = 0;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
glPushMatrix();
glRotated((double)r, 0.0, 1.0, 0.0);
DRAW_SQU();
glPopMatrix();
glDisable(GL_DEPTH_TEST);
glutSwapBuffers();
r = r + 1;
if(r > 360)
{
r= 0;
}
}
void reshape(int w, int h)
{
glViewport(0, 0, w, h);
glLoadIdentity();
gluPerspective(30.0, (double)w / (double)h, 1.0, 100.0);
gluLookAt(3.0, 4.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
}
void timer(int value)
{
glutPostRedisplay();
glutTimerFunc(1,timer,0);
}
/**********[ここから各種関数]***********************/
void DRAW_SQU()
{
glEnable(GL_TEXTURE_2D);
glBegin(GL_QUADS);
glTexCoord2d(0.0, 1.0);
glVertex2d(-1,1);
glTexCoord2d(0.0, 0.0);
glVertex2d(-1,-1);
glTexCoord2d(1.0, 0.0);
glVertex2d(1,-1);
glTexCoord2d(1.0, 1.0);
glVertex2d(1,1);
glEnd();
glDisable(GL_TEXTURE_2D);
}
#include <cstdio>
#include <cstdlib>
#include <fstream>
#include <GL/glut.h>
#include <GL/gl.h>
void display();
void reshape(int w, int h);
void timer(int value);
void DRAW_SQU();
using namespace std;
/*****[テクスチャ用]*****/
GLuint texture[1];
/*****[イメージ構造体+イメージ型]*****/
typedef struct Image
{
unsigned long sizeX;
unsigned long sizeY;
char *data;
}Image;
/****[画像読み込み]**************/
int ImageLoad(char *filename, Image *image)
{
fstream file(filename,ios::in|ios::binary);
if(file.fail())
{
printf("%s: Can't Open.",filename);
std::exit(1);
}
file.seekg(18,ios::cur);
file.read((char*)(&image->sizeX),4);
if( file.bad() )
{
printf("Error reading width from %s.\n", filename);
return 0;
}
file.read((char*)(&image->sizeY),4);
if( file.bad() )
{
printf("Error reading height from %s.\n", filename);
return 0;
}
unsigned long size;
size = image->sizeX * image->sizeY * 3;
unsigned short int planes;
file.read((char*)&planes,2);
if( file.bad() )
{
printf("Error reading planes from %s.\n", filename);
return 0;
}
if (planes != 1)
{
printf("Planes from %s is not 1: %u\n", filename, planes);
return 0;
}
unsigned short int bpp;
file.read((char*)&bpp,2);
if( file.bad() )
{
printf("Error reading bpp from %s.\n", filename);
return 0;
}
if (bpp != 24)
{
printf("Bpp from %s is not 24: %u\n", filename, bpp);
return 0;
}
file.seekg(24,ios::cur);
try
{
image->data = new char[size];
}
catch(std::bad_alloc)
{
printf("Error allocating memory for color-corrected image data");
return 0;
}
file.read(image->data,size);
if( file.bad() )
{
printf("Error reading image data from %s.\n", filename);
return 0;
}
char temp;
for (unsigned long i=0;i<size;i+=3) {
temp = image->data[i];
image->data[i] = image->data[i+2];
image->data[i+2] = temp;
}
return 1;
}
/*****[テクスチャ読み込み]******************/
void LoadGLTextures()
{
Image *image1;
try
{
image1 = new Image;
}
catch(std::bad_alloc)
{
printf("Error allocating space for image");
std::exit(0);
}
if (!ImageLoad("test2.bmp", image1))
{
std::exit(1);
}
/******* [テクスチャのバインド] ****************/
glGenTextures(1, &texture[0]);
glBindTexture(GL_TEXTURE_2D, texture[0]);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
gluBuild2DMipmaps(GL_TEXTURE_2D, 3, image1->sizeX,image1->sizeY, GL_RGB,GL_UNSIGNED_BYTE, image1->data);
delete [] image1->data;
delete(image1);
};
inline void GLUT_INIT()
{
glutInitDisplayMode(GLUT_RGBA| GLUT_DOUBLE | GLUT_DEPTH);
}
inline void GLUT_CALL_FUNC()
{
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutTimerFunc(100,timer,0);
}
inline void MY_INIT()
{
glClearColor(1.0, 1.0, 1.0, 1.0);
LoadGLTextures();
}
int main(int argc, char **argv)
{
glutInit(&argc,argv);
GLUT_INIT();
glutCreateWindow("window name");
GLUT_CALL_FUNC();
MY_INIT();
glutMainLoop();
return 0;
}
/********[ここから、コールバック]****************************************/
void display()
{
static int r = 0;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
glPushMatrix();
glRotated((double)r, 0.0, 1.0, 0.0);
DRAW_SQU();
glPopMatrix();
glDisable(GL_DEPTH_TEST);
glutSwapBuffers();
r = r + 1;
if(r > 360)
{
r= 0;
}
}
void reshape(int w, int h)
{
glViewport(0, 0, w, h);
glLoadIdentity();
gluPerspective(30.0, (double)w / (double)h, 1.0, 100.0);
gluLookAt(3.0, 4.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
}
void timer(int value)
{
glutPostRedisplay();
glutTimerFunc(1,timer,0);
}
/**********[ここから各種関数]***********************/
void DRAW_SQU()
{
glEnable(GL_TEXTURE_2D);
glBegin(GL_QUADS);
glTexCoord2d(0.0, 1.0);
glVertex2d(-1,1);
glTexCoord2d(0.0, 0.0);
glVertex2d(-1,-1);
glTexCoord2d(1.0, 0.0);
glVertex2d(1,-1);
glTexCoord2d(1.0, 1.0);
glVertex2d(1,1);
glEnd();
glDisable(GL_TEXTURE_2D);
}