BMP test

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <GL/glut.h>

void ScreenShot(int W, int H);

void renderScene(void) {
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glBegin(GL_TRIANGLES);
    glVertex3f(-0.5, -0.5, 0.0);
    glVertex3f(0.0, 0.5, 0.0);
    glVertex3f(0.5, -0.5, 0.0);
    glEnd();

    ScreenShot(400, 400);
    glutSwapBuffers();
}

int main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);
    glutInitWindowPosition(100, 100);
    glutInitWindowSize(400, 400);
    glutCreateWindow("Урок 1");

    glutDisplayFunc(renderScene);

    glutMainLoop();

    return 1;
}

void ScreenShot(int W, int H)
{
    const int imSize = W * H * 3;
    unsigned char *image = new unsigned char[imSize];
    memset(image, 0, imSize);
    glReadPixels(0, 0, W, H, GL_RGB, GL_UNSIGNED_BYTE, image);
    BITMAPINFO bmi;
    memset(&bmi, 0, sizeof(BITMAPINFOHEADER));
    bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
    bmi.bmiHeader.biHeight = H;
    bmi.bmiHeader.biWidth = W;
    bmi.bmiHeader.biPlanes = 1;
    bmi.bmiHeader.biBitCount = 24;
    bmi.bmiHeader.biCompression = BI_RGB;
    bmi.bmiHeader.biSizeImage = imSize;
    FILE *F = fopen("C:\\test\\screen.bmp", "w");
    int nBitsOffset = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
    LONG lImageSize = imSize;
    LONG lFileSize = nBitsOffset + lImageSize;
    BITMAPFILEHEADER bmfh;
    bmfh.bfType = 'B' + ('M' << 8);
    bmfh.bfOffBits = nBitsOffset;
    bmfh.bfSize = lFileSize;
    bmfh.bfReserved1 = bmfh.bfReserved2 = 0;

    UINT nWrittenFileHeaderSize = fwrite(&bmfh, 1, sizeof(BITMAPFILEHEADER), F);
    UINT nWrittenInfoHeaderSize = fwrite(&bmi, 1, sizeof(BITMAPINFOHEADER), F);
    UINT nWrittenDIBDataSize = fwrite(image, 1, imSize, F);
    UINT total = nWrittenDIBDataSize + nWrittenInfoHeaderSize + nWrittenFileHeaderSize;
    delete[]image;
    fclose(F);
}