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#include <windows.h>
#include <gl/gl.h>
#include <gl/glu.h>
#include <stdio.h>
#include "bitmap.h"
#define BITMAP_FILESIZE 0x02
#define BITMAP_OFFSET 0x0a
#define BITMAP_HEADERSIZE 0x0e
#define BITMAP_WIDTH 0x12
#define BITMAP_HEIGHT 0x16
void load_image(char *filename)
{
GLuint texture;
FILE *bitmap;
// try to open the file
bitmap = fopen(filename, "rb");
// does the bitmap exist?
if (bitmap > 0)
{
unsigned int dataoffset, filesize;
GLsizei width, height;
unsigned char *imagedata;
fseek(bitmap, BITMAP_FILESIZE, SEEK_SET);
fread(&filesize, 4, 1, bitmap);
fseek(bitmap, BITMAP_OFFSET, SEEK_SET);
fread(&dataoffset, 4, 1, bitmap);
fseek(bitmap, BITMAP_WIDTH, SEEK_SET);
fread(&width, 4, 1, bitmap);
fread(&height, 4, 1, bitmap);
imagedata = (unsigned char *)malloc((size_t)(filesize -dataoffset));
fseek(bitmap, dataoffset, SEEK_SET);
fread(imagedata, (size_t)(filesize -dataoffset), 1, bitmap);
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGB, width, height, GL_RGB, GL_UNSIGNED_BYTE, imagedata);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
free(imagedata);
fclose(bitmap);
}
}
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