Maze-OpenGL/texture.cpp at master · Gheeroppa/Maze-OpenGL · GitHub

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#include <stdlib.h>
#include <cmath>
#include <GL/glut.h>
#include <iostream>

using namespace std;

//---- Texture ------------------------------------------------------

// Data read from the header of the BMP file
unsigned char header[54]; // Each BMP file begins by a 54-bytes header
unsigned int dataPos;     // Position in the file where the actual data begins
unsigned int width, height;
unsigned int imageSize;   // = width*height*3
// Actual RGB data
unsigned char * data;


GLuint loadBMP_custom(const char * imagepath)
{
    FILE * file = fopen(imagepath,"rb");
    if (!file){printf("Image could not be opened\n"); return 0;}
    if ( fread(header, 1, 54, file)!=54 ){ // If not 54 bytes read : problem
      printf("Not a correct BMP file\n");
      return false;
    }
    if ( header[0]!='B' || header[1]!='M' ){
      printf("Not a correct BMP file\n");
      return 0;
    }
    // Read ints from the byte array
    dataPos    = *(int*)&(header[0x0A]);
    imageSize  = *(int*)&(header[0x22]);
    width      = *(int*)&(header[0x12]);
    height     = *(int*)&(header[0x16]);

    // Some BMP files are misformatted, guess missing information
    if (imageSize==0)    imageSize=width*height*3; // 3 : one byte for each Red, Green and Blue component
    if (dataPos==0)      dataPos=54; // The BMP header is done that way

    // Create a buffer
    data = new unsigned char [imageSize];

    // Read the actual data from the file into the buffer
    fread(data,1,imageSize,file);

    //Everything is in memory now, the file can be closed
    fclose(file);
}

void caricaTexture()
{
    GLuint Texture = loadBMP_custom("images/bricks.bmp");

    glBindTexture(GL_TEXTURE_2D, 1);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
    glTexImage2D(GL_TEXTURE_2D, 0,GL_RGB, width, height, 0, GL_BGR, GL_UNSIGNED_BYTE, data);

    Texture = loadBMP_custom("images/siepe.bmp");

    glBindTexture(GL_TEXTURE_2D, 2);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
    glTexImage2D(GL_TEXTURE_2D, 0,GL_RGB, width, height, 0, GL_BGR, GL_UNSIGNED_BYTE, data);


    Texture = loadBMP_custom("images/gold.bmp");

    glBindTexture(GL_TEXTURE_2D, 3);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
    glTexImage2D(GL_TEXTURE_2D, 0,GL_RGB, width, height, 0, GL_BGR, GL_UNSIGNED_BYTE, data);

    Texture = loadBMP_custom("images/night1.bmp");

    glBindTexture(GL_TEXTURE_2D, 4);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
    glTexImage2D(GL_TEXTURE_2D, 0,GL_RGB, width, height, 0, GL_BGR, GL_UNSIGNED_BYTE, data);


}