現在地 >> メニュー >> サンプルコード::OpenGL >> 複数の画像とテクスチャ >> 複数の画像とテクスチャ::複数の読み込み(改) >> newをつかって読み込む >> newをつかって読み込む::C++

問題


C++で複数の画像を読み込んでテクスチャとせよ

画像1
画像2

答え


#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <fstream>
#include <new>
#include <GL/glut.h>
#include <GL/gl.h>



void display();
void reshape(int w, int h);
void timer(int value);
void keyboard(unsigned char key, int x, int y);


void DRAW_XYZ();
void DRAW_SQU();


using namespace std;

#define TEXT_N 2
char *textures[]={"test2.bmp","test.bmp"};


/*****[テクスチャ用]*****/
GLuint texture[TEXT_N];



/*****[イメージ構造体]*****/
struct Image {
unsigned long sizeX;
unsigned long sizeY;
char *data;
};
typedef struct Image Image;

/****[イメージロード]**************/
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[TEXT_N];

glGenTextures(TEXT_N, &texture[0]);

for(int i = 0;i<TEXT_N;i++){

try{
image1[i] = new Image;
}catch(std::bad_alloc)
{
printf("Error allocating space for image");
std::exit(0);
}

if ( !ImageLoad(textures[i], image1[i]) )
{
printf("ImageLoad Error\n");
std::exit(1);
}

glBindTexture(GL_TEXTURE_2D, texture[i]);
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[i]->sizeX,image1[i]->sizeY, GL_RGB,GL_UNSIGNED_BYTE,image1[i]->data);

delete [] image1[i]->data;
delete (image1[i]);

}


};


inline void GLUT_INIT()
{
glutInitDisplayMode(GLUT_RGBA| GLUT_DOUBLE | GLUT_DEPTH);
}

inline void GLUT_CALL_FUNC()
{
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutTimerFunc(100,timer,0);
glutKeyboardFunc(keyboard);
}

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;
}


/********[各種コールバック]****************************************/
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);
}

int num = 0;
void keyboard(unsigned char key, int x, int y)
{
switch (key) {
case '1':
num = 0;
break;
case '2':
num = 1;
break;

case '3':
num = 2;
break;

case '4':
num = 3;
break;

case '5':
num = 4;
break;

default:
break;
}
}



/**********[ここから、各種関数]***********************/
void DRAW_SQU()
{

glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texture[num]);

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);
}

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計測中...(07.10.8〜)

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