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i have a problme in uplode my image in openGL i dont know what is wrong here but everytime the output is whaite windo this is my code and the image my ortho is 1,-1 and its 2D

//C:/Users/asus-pc/Documents/CG.bmp
#include <GL\glew.h> // A cross-platform open-source C/C++ extension loading library
#include <GL\freeglut.h>
#include<cmath>
#include<iostream> 
using namespace std;
float  w = 500, h = 500, newWidth, newHeight;
GLuint myTexture1;

char image1Path[] = "C:/Users/asus-pc/Pictures/CG.bmp";


GLuint LoadTexture(const char* filename, int width, int height)
{
    GLuint texture;
    unsigned char* data;
    FILE* file;

    //The following code will read in our RAW file
    file = fopen(filename, "rb");

    if (file == NULL)
    {
        cout << "Unable to open the image file" << endl << "Program will exit :(" << endl;
        exit(0);
        return 0;
    }

    data = (unsigned char*)malloc(width * height * 3);
    fread(data, width * height * 3, 1, file);

    fclose(file);


    // reorder the image colors to RGB not BGR
    for (int i = 0; i < width * height; ++i)
    {
        int index = i * 3;
        unsigned char B, R;
        B = data[index];
        R = data[index + 2];

        data[index] = R;
        data[index + 2] = B;

    }


    /////////////////////////////////////////
    // All Exercises TODO: load another texture image
    //////
    glGenTextures(1, &texture);            //generate the texture with the loaded data
    glBindTexture(GL_TEXTURE_2D, texture); //bind the texture to it's array

    glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE); //set texture environment parameters

    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
    /////////////////////////////////////////

    free(data); //free the texture array

    if (glGetError() != GL_NO_ERROR)
        printf("GLError in genTexture()\n");

    return texture; //return whether it was successfull  
}


void init() {
    glClearColor(0.869, 0.880, 0.766, 1.0f);
    //glClearColor(0.8f, 0.2f, 0.3f, 1.0f); //TOBIAS
    //glClearColor(0.86f, 0.90f, 0.75f, 1.0f); // Set background color to orangeeee
    glMatrixMode(GL_PROJECTION); // set the projection parameters
    glLoadIdentity();
    glOrtho(-1, 1, -1, 1, -1, 1);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    gluLookAt(1.5, 1.5, -1.5, 0, 1, -1, 0, 1, 0);

    myTexture1 = LoadTexture(image1Path, 1024, 1024);

    if (myTexture1 == -1)
    {
        cout << "Error in loading the texture" << endl;
    }
    else
        cout << "The texture value is: " << myTexture1 << endl;

}

void square() {
    glEnable(GL_TEXTURE_2D);
    glBindTexture(GL_TEXTURE_2D, myTexture1);
    glColor3f(0, 0, 0);
    glBegin(GL_QUADS);
    glNormal3f(0, 0, 1);

    glTexCoord2f(1, 0);
    glVertex3f(1, -1, 0);


    glTexCoord2f(1, 1);
    glVertex3f(1, 1, 0);

    glTexCoord2f(0, 1);
    glVertex3f(-1, 1, 0);

    glTexCoord2f(0, 0);
    glVertex3f(-1, -1, 0);

    glEnd();

    glDisable(GL_TEXTURE_2D);
}

void drawAll() {
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(-1, 1, -1, 1, -1, 1);
    square();
    glFlush();
glutSwapBuffers();
}
int main(int argc, char** argv) {
    glutInit(&argc, argv); // Initialize GLUT
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH); // Specify the display Mode – RGB, RGBA or color

    // Index, single or double Buffer
    glutCreateWindow("STUFF"); // Create a window with the given title
    glutInitWindowSize(320, 320); // Set the window's initial width & height
    glutInitWindowPosition(50, 50); // Position the window's initial top-left corner
    init();
    //glutReshapeFunc(reshape);
    //glutIdleFunc(play);
    glutDisplayFunc(drawAll);

    glutMainLoop();
    return 0;
}

i try to load some libary but it dosnt work and use different imgage to make sure the proplem not in my image this is my first use in openGL so i dont know much how to work with it

Ghadisa
  • 1

0 Answers0