为什么我的 OpenGL Win32 应用程序深度受到限制以及如何增加它?

问题描述 投票:0回答:1

当我的 OpenGL 场景 3D 超出“3D 视口深度”时,它会变成全黑,但我没有成功增加“相机深度远值”的值

如果你想在代码块中进行C/C,这是我的完整代码

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

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

float relx = 0.0f;
float relz = 0.0f;

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,
                          1024,
                          768,
                          NULL,
                          NULL,
                          hInstance,
                          NULL);

    ShowWindow(hwnd, nCmdShow);

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

    /* 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 */
            glViewport(0,0,1280,720);
            glDepthRange(0,100000);
            glEnable(GL_DEPTH_TEST);
            glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
            glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

            glPushMatrix();
            glRotatef(relx, 0,1,0);
            glRotatef(-10, 1,0,0);
            glTranslatef(-0.5, -0.75f, relz);

            glBegin(GL_QUADS);

                glColor3f(1.0f, 0.0f, 0.0f);   glVertex3f(0,0,0);
                glColor3f(1.0f, 0.0f, 0.0f);   glVertex3f(1,0,0);
                glColor3f(1.0f, 0.0f, 0.0f);   glVertex3f(1,1,0);
                glColor3f(1.0f, 0.0f, 0.0f);   glVertex3f(0,1,0);

            glEnd();

            glBegin(GL_QUADS);

                glColor3f(0.0f, 0.0f, 1.0f);   glVertex3f(0,0,1);
                glColor3f(0.0f, 0.0f, 1.0f);   glVertex3f(1,0,1);
                glColor3f(0.0f, 0.0f, 1.0f);   glVertex3f(1,1,1);
                glColor3f(0.0f, 0.0f, 1.0f);   glVertex3f(0,1,1);

            glEnd();

            glBegin(GL_QUADS);

                glColor3f(0.0f, 1.0f, 1.0f);   glVertex3f(0,1,0);
                glColor3f(0.0f, 1.0f, 1.0f);   glVertex3f(1,1,0);
                glColor3f(0.0f, 1.0f, 1.0f);   glVertex3f(1,1,1);
                glColor3f(0.0f, 1.0f, 1.0f);   glVertex3f(0,1,1);

            glEnd();

             glBegin(GL_QUADS);

                glColor3f(1.0f, 0.0f, 1.0f);   glVertex3f(0,0,0);
                glColor3f(1.0f, 0.0f, 1.0f);   glVertex3f(1,0,0);
                glColor3f(1.0f, 0.0f, 1.0f);   glVertex3f(1,0,1);
                glColor3f(1.0f, 0.0f, 1.0f);   glVertex3f(0,0,1);

            glEnd();

            glBegin(GL_QUADS);

                glColor3f(1.0f, 1.0f, 1.0f);   glVertex3f(0,0,0);
                glColor3f(1.0f, 1.0f, 1.0f);   glVertex3f(0,1,0);
                glColor3f(1.0f,1.0f, 1.0f);   glVertex3f(0,1,1);
                glColor3f(1.0f, 1.0f, 1.0f);   glVertex3f(0,0,1);

            glEnd();

             glBegin(GL_QUADS);

                glColor3f(1.0f, 1.0f, 0.0f);   glVertex3f(1,0,0);
                glColor3f(1.0f, 1.0f, 0.0f);   glVertex3f(1,1,0);
                glColor3f(1.0f, 1.0f, 0.0f);   glVertex3f(1,1,1);
                glColor3f(1.0f, 1.0f, 0.0f);   glVertex3f(1,0,1);

            glEnd();

            glPopMatrix();

            SwapBuffers(hDC);

            theta += 1.0f;
            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;
                case VK_LEFT:
                    relx += 1;
                break;
                case VK_RIGHT:
                    relx -= 1;
                break;
                case VK_UP:
                    relz += 0.1;
                break;
                case VK_DOWN:
                    relz -= 0.1;
                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 = 160000000;
    pfd.iLayerType = PFD_DIRECT3D_ACCELERATED;

    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);
}

我尝试过

glDepthRange(0,100000);
但不成功,如果太远我的3D立方体会变黑,我想增加“太远”的值

c winapi opengl depth-buffer
1个回答
0
投票

更改 glDepthRange 不会执行任何操作。您需要利用投影矩阵来实现您的目标。

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