OpenGL de プログラミング

以下の画像を、RGBA画像に作り直して、
テクスチャを作成せよ


画像

アルファデータ画像

#include <cstdio>
#include <cstdlib>
#include <cv.h>
#include <highgui.h>
#include <iostream>
#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;

#define TEXT_N 2
const char *files[]={"test2.bmp","mask2.bmp"};


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


/*****[画像読み込み準備]******************/
inline void LoadGLTextures()
{
IplImage *image1[TEXT_N];
IplImage *gray;

glGenTextures(TEXT_N, &texture[0]);


for(int i = 0;i<TEXT_N;i++)
{
image1[i]=cvLoadImage(files[i],CV_LOAD_IMAGE_ANYDEPTH | CV_LOAD_IMAGE_ANYCOLOR);
if(image1[i]==NULL)
{
printf("can't load image \n");
std::exit(0);
}

cvFlip(image1[i],NULL,0);

}

cvCvtColor(image1[0], image1[0], CV_BGR2RGB);
gray = cvCreateImage(cvGetSize(image1[1]),IPL_DEPTH_8U,1);
cvCvtColor(image1[1], gray, CV_BGR2GRAY);

cvReleaseImage(&image1[1]);


unsigned char *data;
unsigned long size;
size = image1[0]->width*image1[0]->height*4;
data = new unsigned char[size];
unsigned long m=0;
unsigned long n=0;
for(unsigned long l = 0; l < size ;l+=4,m+=3,n++)
{

data[l]=(unsigned)image1[0]->imageData[m];
data[l+1]=(unsigned)image1[0]->imageData[m+1];
data[l+2]=(unsigned)image1[0]->imageData[m+2];
data[l+3]=(unsigned)gray->imageData[n];

}

cvReleaseImage(&gray);


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, GL_RGBA8, image1[0]->width,image1[0]->height, GL_RGBA,GL_UNSIGNED_BYTE,data);
cvReleaseImage(&image1[0]);


delete [] data;

};


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();
glAlphaFunc(GL_LESS, 0.5);
}

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()
{

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glLoadIdentity();
gluLookAt(3.0, 4.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);

glEnable(GL_DEPTH_TEST);
glEnable(GL_ALPHA_TEST);

glPushMatrix();

DRAW_SQU();

glPopMatrix();

glDisable(GL_ALPHA_TEST);
glDisable(GL_DEPTH_TEST);

glutSwapBuffers();
}


void reshape(int w, int h)
{
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(30.0, (double)w / (double)h, 1.0, 100.0);
glMatrixMode(GL_MODELVIEW);
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); //タイマー関数
}


/**********[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);
}