我正在尝试创建一个可以处理openGl（新版本）的win32。它似乎不是关于win32 / opengl（新版本，大多数示例都在旧版本中）的变量信息。 我发现的一些信息引导我使用此代码。但它没有显示正方形。 有没有人知道这是否是正确的方法，如果是这样的话它有什么问题（它没有显示方块）。 PS。我知道vbo，vao，shader的部分正在工作，因为我已经用sdl做了。
非常感谢.... :)
以下是代码：
#include <iostream>
#include <windows.h>
#include <stdlib.h>
#include <string.h>
#include <tchar.h>
#include <glew.h>
#include <wglew.h>
using namespace std;
void display(){
// display square
}
bool progRun = false;
//-------------------------------------------------------------------
//#####################################################################
//-------------------------------------------------------------------
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
int CALLBACK WinMain(
HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow
){
WNDCLASSEX wcex;
///////////////////////////LOAD GLEW///////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC | CS_DBLCLKS ;
wcex.lpfnWndProc = WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = NULL;
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = NULL;
if (!RegisterClassEx(&wcex))
{
MessageBox(NULL,"RegisterClassEx","ERROR",MB_OK|MB_ICONSTOP);
return 0;
}
HWND hWnd = CreateWindow(
szWindowClass,
szTitle,
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
500, 500,
NULL,
NULL,
hInstance,
NULL
);
if (!hWnd)
{
MessageBox(NULL,"hWnd","ERROR",MB_OK|MB_ICONSTOP);
return -1;
}
HDC hdc = GetDC(hWnd);
PIXELFORMATDESCRIPTOR pfd;
memset(&pfd, 0, sizeof(PIXELFORMATDESCRIPTOR));
pfd.nSize= sizeof(PIXELFORMATDESCRIPTOR);
pfd.nVersion = 1;
pfd.dwFlags = PFD_DOUBLEBUFFER | PFD_SUPPORT_OPENGL | PFD_DRAW_TO_WINDOW;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 32;
pfd.cDepthBits = 32;
pfd.iLayerType = PFD_MAIN_PLANE;
int pf = ChoosePixelFormat(hdc, &pfd);
if(pf == 0){
MessageBox(NULL,"pf == 0","ERROR",MB_OK|MB_ICONSTOP);
return -1;
}
if(SetPixelFormat(hdc, pf, &pfd) == false){
MessageBox(NULL,"SetPixelFormat","ERROR",MB_OK|MB_ICONSTOP);
return -1;
}
DescribePixelFormat(hdc, pf, sizeof(PIXELFORMATDESCRIPTOR), &pfd);
HGLRC hrc = wglCreateContext(hdc);
wglMakeCurrent(hdc, hrc);
glewExperimental = true;
if(glewInit() != GLEW_OK){
MessageBox(NULL, "Couldn't initialize GLEW!", "Fatal Error", MB_ICONERROR);
}
wglMakeCurrent(NULL, NULL);
ReleaseDC(hWnd, hdc);
wglDeleteContext(hrc);
DestroyWindow(hWnd);
///////////////////////////////TO_CREATE A OPENGL CONTEXT WITH LATER VERSION///////////////////////////////////////
//////////////////////////////////////////////////////////////////////
#define iMajorVersion 3
#define iMinorVersion 1
hWnd = CreateWindow(
szWindowClass,
szTitle,
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
500, 500,
NULL,
NULL,
hInstance,
NULL
);
if (!hWnd)
{
MessageBox(NULL,"hWnd","ERROR",MB_OK|MB_ICONSTOP);
return -1;
}
hdc = GetDC(hWnd);
bool bError = false;
if(iMajorVersion <= 2)
{
cout << "version 2" <<endl;
memset(&pfd, 0, sizeof(PIXELFORMATDESCRIPTOR));
pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
pfd.nVersion = 1;
pfd.dwFlags = PFD_DOUBLEBUFFER | PFD_SUPPORT_OPENGL | PFD_DRAW_TO_WINDOW;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 32;
pfd.cDepthBits = 32;
pfd.iLayerType = PFD_MAIN_PLANE;
pf = ChoosePixelFormat(hdc, &pfd);
if (pf == 0){
MessageBox(NULL,"pf == 0","ERROR",MB_OK|MB_ICONSTOP);
return false;
}
if(!SetPixelFormat(hdc, pf, &pfd)){
MessageBox(NULL,"SetPixelFormat 1","ERROR",MB_OK|MB_ICONSTOP);
return false;
}
// Create the old style context (OpenGL 2.1 and before)
hrc = wglCreateContext(hdc);
if(hrc)wglMakeCurrent(hdc, hrc);
else bError = true;
}
else if(WGLEW_ARB_create_context && WGLEW_ARB_pixel_format)
{
cout << "version 3" <<endl;
const int iPixelFormatAttribList[] =
{
WGL_DRAW_TO_WINDOW_ARB, GL_TRUE,
WGL_SUPPORT_OPENGL_ARB, GL_TRUE,
WGL_DOUBLE_BUFFER_ARB, GL_TRUE,
WGL_PIXEL_TYPE_ARB, WGL_TYPE_RGBA_ARB,
WGL_COLOR_BITS_ARB, 32,
WGL_DEPTH_BITS_ARB, 24,
WGL_STENCIL_BITS_ARB, 8,
0 // End of attributes list
};
int iContextAttribs[] =
{
WGL_CONTEXT_MAJOR_VERSION_ARB, iMajorVersion,
WGL_CONTEXT_MINOR_VERSION_ARB, iMinorVersion,
WGL_CONTEXT_FLAGS_ARB, WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
0 // End of attributes list
};
int iNumFormats;
if(!wglChoosePixelFormatARB(hdc, iPixelFormatAttribList, NULL, 1, &pf, (UINT*)&iNumFormats)){
MessageBox(NULL,"wglChoosePixelFormatARB","ERROR",MB_OK|MB_ICONSTOP);
return 0;
}
// PFD seems to be only redundant parameter now
if(!SetPixelFormat(hdc, pf, &pfd)){
MessageBox(NULL,"SetPixelFormat 2","ERROR",MB_OK|MB_ICONSTOP);
return false;
}
hrc = wglCreateContextAttribsARB(hdc, 0, iContextAttribs);
// If everything went OK
if(hrc) wglMakeCurrent(hdc, hrc);
else bError = true;
//glewInit();
}else{
bError = true;
}
if(bError)
{
// Generate error messages
char sErrorMessage[255], sErrorTitle[255];
sprintf(sErrorMessage, "OpenGL %d.%d is not supported! Please download latest GPU drivers!", iMajorVersion, iMinorVersion);
sprintf(sErrorTitle, "OpenGL %d.%d Not Supported", iMajorVersion, iMinorVersion);
MessageBox(hWnd, sErrorMessage, sErrorTitle, MB_ICONINFORMATION);
return false;
}
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
MSG msg;
progRun = true;
ShowWindow(hWnd,SW_SHOW);
UpdateWindow(hWnd);
//-----------Setup shader and objects
setupShader();
setupObject();
//-------
glClearDepth(1.0f); // Depth Buffer Setup
glEnable(GL_DEPTH_TEST); // Enables Depth Testing
glDepthFunc(GL_LEQUAL);
glClearColor(1,0,0,1);
while(progRun){
if (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE)){
TranslateMessage(&msg);
DispatchMessage(&msg);
}
glClear(GL_COLOR_BUFFER_BIT);
display();
SwapBuffers(hdc);
}
return (int) msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
PAINTSTRUCT ps;
HDC hdc;
switch (message){
case WM_ERASEBKGND:
display();
break;
case WM_PAINT:
BeginPaint(hWnd, &ps);
EndPaint(hWnd, &ps);
break;
case WM_SIZE:
glViewport(0, 0, LOWORD(lParam), HIWORD(lParam));
break;
case WM_DESTROY:
PostQuitMessage(0);
progRun = false;
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
break;
}
return 0;
}
答案 0 :(得分：0)
如果您使用wglCreateContext，则会获得旧上下文（＆lt; = 2.1）。
您需要wglCreateContextAttribsARB。但首先你需要获得一个指向这个函数的指针，这需要使用一个上下文。
所以：
wglCreateContextAttribsARB（也许还有wglChoosePixelFormatARB）的指针
wglGetProcAddress。现在您可以删除旧的上下文。来自wiki OpenGL的有用链接是here和here以及here