opengl 中透视投影到屏幕的对应关系

最新推荐文章于 2024-11-23 10:59:29 发布

G_Spider

最新推荐文章于 2024-11-23 10:59:29 发布

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分类专栏： OpenGL C/C++

本文链接：https://blog.youkuaiyun.com/G_Spider/article/details/9751665

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本文探讨了OpenGL中如何将透视投影转换到屏幕坐标的过程，通过实例展示了窗口尺寸变化对视口投影的影响。

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#include <windows.h>
#include <math.h>
#include <gl/gl.h>
#include <gl/glu.h>
#define PI 3.14159265358979323846264338327950288   // pi

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);

int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,PSTR szCmdLine,int iCmdShow)
{
    static TCHAR szAppName[] = TEXT("HelloWin");
    HWND        hwnd;
    MSG         msg;
    WNDCLASS    wndclass;
    ZeroMemory(&wndclass, sizeof(WNDCLASS));
    wndclass.style        = CS_HREDRAW | CS_VREDRAW;
    wndclass.lpfnWndProc  = WndProc;
    wndclass.hInstance    = hInstance;
    wndclass.hIcon        = LoadIcon(NULL,IDI_APPLICATION);
    wndclass.hCursor      = LoadCursor(NULL,IDC_ARROW);
    wndclass.hbrBackground= (HBRUSH)GetStockObject(BLACK_BRUSH);
    wndclass.lpszClassName= szAppName;
    
    if (!RegisterClass(&wndclass))
    {
        MessageBox(NULL,TEXT("This program requires Windows NT!"),szAppName,MB_ICONERROR);
        return 0;
    }
    hwnd = CreateWindow(szAppName,      // window class name 
        TEXT("The Opengl Program"),     // window caption
        WS_OVERLAPPEDWINDOW|WS_CLIPSIBLINGS|WS_CLIPCHILDREN,// window style
        CW_USEDEFAULT,                  // initial x position
        CW_USEDEFAULT,                  // initial y position
        400,