OpenGL.ChessFloor

#include <windows.h>
#include <gl/gl.h>
#include <math.h>

float vert[] = {1, 1, 0,  1, -1, 0,  -1, -1, 0,  -1, 1, 0}; // пол, плоскость (массив точек)
float xAlpha = 20; // поворот камеры по горизонтальной оси
float zAlpha = 0; // поворот камеры по вертикальной оси
POINTFLOAT pos = {0, 0}; // положение игрока на карте


void ShowWordl() // процедура, для отображения пола на экране
{
    glEnableClientState(GL_VERTEX_ARRAY);
        glVertexPointer(3, GL_FLOAT, 0, &vert);
        for (int i = -5; i < 5; i++)
            for (int j = -5; j < 5; j++)
            {
                glPushMatrix();
                    if ((i + j) % 2 == 0)
                        glColor3f(0.5, 0, 1);
                    else
                        glColor3f(1, 0.6, 0);

                    glTranslatef(i * 2, j * 2, 0);
                    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
                glPopMatrix();
            }
    glDisableClientState(GL_VERTEX_ARRAY);
}

void MoveCamera() // чтобы отодвинуть "камеру", т.е. отодвинуть всю систему координат
{
    if (GetKeyState(VK_UP) < 0) xAlpha = ++xAlpha > 180 ? 180 : xAlpha;
    if (GetKeyState(VK_DOWN) < 0) xAlpha = --xAlpha < 0 ? 0 : xAlpha;
    if (GetKeyState(VK_LEFT) < 0) zAlpha++;
    if (GetKeyState(VK_RIGHT) < 0) zAlpha--;

    float angle = -zAlpha / 180 * M_PI;
    float speed = 0;
    if (GetKeyState('W') < 0)
    speed = 0.1;
    if (GetKeyState('S') < 0)
        speed = -0.1;
    if (GetKeyState('A') < 0)
    {
        speed = 0.1;
        angle -= M_PI * 0.5;
    }
    if (GetKeyState('D') < 0)
    {
        speed = 0.1;
        angle += M_PI * 0.5;
    }
    if (speed != 0)
    {
        pos.x += sin(angle) * speed;
        pos.y += cos(angle) * speed;
    }

    glRotatef(-xAlpha,  1, 0, 0);
    glRotatef(-zAlpha,  0, 0, 1);
    glTranslatef(-pos.x, -pos.y, -3);
}

LRESULT CALLBACK WindowProc(HWND, UINT, WPARAM, LPARAM);
void EnableOpenGL(HWND hwnd, HDC*, HGLRC*);
void DisableOpenGL(HWND, HDC, HGLRC);


int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine,
                   int nCmdShow)
{
    WNDCLASSEX wcex;
    HWND hwnd;
    HDC hDC;
    HGLRC hRC;
    MSG msg;
    BOOL bQuit = FALSE;
    float theta = 0.0f;

    /* register window class */
    wcex.cbSize = sizeof(WNDCLASSEX);
    wcex.style = CS_OWNDC;
    wcex.lpfnWndProc = WindowProc;
    wcex.cbClsExtra = 0;
    wcex.cbWndExtra = 0;
    wcex.hInstance = hInstance;
    wcex.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
    wcex.lpszMenuName = NULL;
    wcex.lpszClassName = "GLSample";
    wcex.hIconSm = LoadIcon(NULL, IDI_APPLICATION);;


    if (!RegisterClassEx(&wcex))
        return 0;

    /* create main window */
    hwnd = CreateWindowEx(0,
                          "GLSample",
                          "OpenGL Sample",
                          WS_OVERLAPPEDWINDOW,
                          CW_USEDEFAULT,
                          CW_USEDEFAULT,
                          1920,
                          1080,
                          NULL,
                          NULL,
                          hInstance,
                          NULL);

    ShowWindow(hwnd, nCmdShow);

    /* enable OpenGL for the window */
    EnableOpenGL(hwnd, &hDC, &hRC);

    glFrustum(-1, 1,  -1, 1,  2, 80); // перспективная проекция

    /* program main loop */
    while (!bQuit)
    {
        /* check for messages */
        if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
        {
            /* handle or dispatch messages */
            if (msg.message == WM_QUIT)
            {
                bQuit = TRUE;
            }
            else
            {
                TranslateMessage(&msg);
                DispatchMessage(&msg);
            }
        }
        else
        {
            /* OpenGL animation code goes here */

            glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
            glClear(GL_COLOR_BUFFER_BIT);

            glPushMatrix();
                MoveCamera();
                ShowWordl();
            glPopMatrix();

            SwapBuffers(hDC);

            Sleep (1);
        }
    }

    /* shutdown OpenGL */
    DisableOpenGL(hwnd, hDC, hRC);

    /* destroy the window explicitly */
    DestroyWindow(hwnd);

    return msg.wParam;
}

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch (uMsg)
    {
        case WM_CLOSE:
            PostQuitMessage(0);
        break;

        case WM_DESTROY:
            return 0;

        case WM_KEYDOWN:
        {
            switch (wParam)
            {
                case VK_ESCAPE:
                    PostQuitMessage(0);
                break;
            }
        }
        break;

        default:
            return DefWindowProc(hwnd, uMsg, wParam, lParam);
    }

    return 0;
}

void EnableOpenGL(HWND hwnd, HDC* hDC, HGLRC* hRC)
{
    PIXELFORMATDESCRIPTOR pfd;

    int iFormat;

    /* get the device context (DC) */
    *hDC = GetDC(hwnd);

    /* set the pixel format for the DC */
    ZeroMemory(&pfd, sizeof(pfd));

    pfd.nSize = sizeof(pfd);
    pfd.nVersion = 1;
    pfd.dwFlags = PFD_DRAW_TO_WINDOW |
                  PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
    pfd.iPixelType = PFD_TYPE_RGBA;
    pfd.cColorBits = 24;
    pfd.cDepthBits = 16;
    pfd.iLayerType = PFD_MAIN_PLANE;

    iFormat = ChoosePixelFormat(*hDC, &pfd);

    SetPixelFormat(*hDC, iFormat, &pfd);

    /* create and enable the render context (RC) */
    *hRC = wglCreateContext(*hDC);

    wglMakeCurrent(*hDC, *hRC);
}

void DisableOpenGL (HWND hwnd, HDC hDC, HGLRC hRC)
{
    wglMakeCurrent(NULL, NULL);
    wglDeleteContext(hRC);
    ReleaseDC(hwnd, hDC);
}