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私の問題は、私のプログラムが画面上に何も表示していないことです。OpenGLに何も表示されませんか？
これは "main.cppに" コードです：
#include "paStdAfx.h"
#include "OpenGL.h"
HDC hDC = NULL;
HGLRC hRC = NULL;
HWND hwnd = NULL;
HINSTANCE hInstance = GetModuleHandle(NULL);
const wchar_t* szClassName = _T("*project name :3*");
static std::wstring Titles[] = {
_T("*project name :3* - 100% free!"),
_T("*project name :3* - 100% OpenGL!"),
_T("*project name :3* - Not cross platform!"),
_T("*project name :3* - Rawr"),
_T("*project name :3* - Entirely C++!"),
_T("*project name :3* - Woo, /r/gamedev!"),
_T("*project name :3* - Platypi, platypi everywhere."),
_T("*project name :3* - Nom nom nom"),
_T("*project name :3* - Thanks, StackExchange!"),
_T("*project name :3* - DRM Free!"),
_T("*project name :3* - <3"),
_T("*project name :3* - Minecraft is also fun!")
};
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
BOOL CreateOpenGLWindow(const wchar_t*, int, int, int);
OpenGL ogl;
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int iCmdShow)
{
srand(time(NULL));
const std::wstring wtt = Titles[rand() % 11];
const wchar_t* WindowTitle = wtt.c_str();
BOOL done = FALSE;
MSG msg;
if(!CreateOpenGLWindow(WindowTitle, 800, 600, 32)){ MessageBox(NULL, _T("Could not create window :("), _T("Error!"), MB_OK | MB_ICONERROR); exit(EXIT_FAILURE); }
while(!done)
{
if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
{
if(msg.message == WM_QUIT)
done = TRUE;
else
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
else
{
ogl.RenderGLScene();
SwapBuffers(hDC);
}
}
ogl.KillOpenGL(hwnd, hDC, hRC);
return 0;
}
BOOL CreateOpenGLWindow(const wchar_t* title, int width, int height, int bits)
{
WNDCLASSEX wcx = {0};
DWORD dwExStyle = WS_EX_APPWINDOW | WS_EX_WINDOWEDGE;
DWORD dwStyle = WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX;
wcx.cbSize = sizeof(WNDCLASSEX);
wcx.style = CS_OWNDC;
wcx.lpfnWndProc = WndProc;
wcx.cbClsExtra = 0;
wcx.cbWndExtra = 0;
wcx.hInstance = hInstance;
wcx.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_PROGRAMICON));
wcx.hCursor = LoadCursor(NULL, IDC_ARROW);
wcx.hbrBackground = (HBRUSH) (COLOR_WINDOW + 1);
wcx.lpszClassName = szClassName;
wcx.lpszMenuName = NULL;
wcx.hIconSm = (HICON) LoadImage(hInstance, MAKEINTRESOURCE(IDI_PROGRAMICON), IMAGE_ICON, 16, 16, 0);
if(!RegisterClassEx(&wcx)){ MessageBox(NULL, _T("Failed to register window!"), _T("Error! :("), MB_OK | MB_ICONERROR); exit(EXIT_FAILURE); }
if(!(hwnd = CreateWindowEx(dwExStyle, szClassName, title, dwStyle, 200, 69, width, height, NULL, NULL, hInstance, NULL))){ MessageBox(NULL, _T("Failed to create the window!"), _T("Error! :("), MB_OK | MB_ICONERROR); exit(EXIT_FAILURE); }
ogl.CreateOpenGLContext(hwnd, &hDC, &hRC);
ogl.PrepareOpenGLScene();
ogl.ResizeGLScene(width, height);
ShowWindow(hwnd, SW_SHOW);
SetForegroundWindow(hwnd);
SetFocus(hwnd);
return TRUE;
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_CREATE:
ogl.ProgramIcon(hwnd);
break;
case WM_KEYDOWN:
switch(wParam)
{
case VK_ESCAPE:
PostQuitMessage(0);
break;
}
break;
case WM_CLOSE:
PostQuitMessage(0);
break;
case WM_DESTROY:
return 0;
}
return DefWindowProc(hwnd, msg, wParam, lParam);
}
と、これは "OpenGL.cpp" のコードです：
#include "paStdAfx.h"
#include "OpenGL.h"
GLvoid OpenGL::CreateOpenGLContext(HWND hwnd, HDC* hDC, HGLRC* hRC)
{
PIXELFORMATDESCRIPTOR pfd;
HGLRC tempContext;
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;
*hDC = GetDC(hwnd);
int PixelFormat = ChoosePixelFormat(*hDC, &pfd);
if(PixelFormat == 0){ MessageBox(NULL, _T("Could not choose pixel format :("), _T("Error!"), MB_OK | MB_ICONERROR); exit(EXIT_FAILURE); }
if(!SetPixelFormat(*hDC, PixelFormat, &pfd)){ MessageBox(NULL, _T("Could not set pixel format :("), _T("Error!"), MB_OK | MB_ICONERROR); exit(3); }
tempContext = wglCreateContext(*hDC);
wglMakeCurrent(*hDC, tempContext);
GLenum err = glewInit();
if(GLEW_OK != err){ MessageBox(NULL, _T("Failed to initialize GLEW! :("), _T("Warning!"), MB_OK | MB_ICONINFORMATION); }
int attribs[] = {
WGL_CONTEXT_MAJOR_VERSION_ARB, 3,
WGL_CONTEXT_MINOR_VERSION_ARB, 1,
WGL_CONTEXT_FLAGS_ARB,
WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
0
};
if(!glewIsSupported("GL_VERSION_3_1")){ MessageBox(NULL, _T("OpenGL 3.1 not supported :("), _T("Warning!"), MB_OK | MB_ICONERROR); }
if(wglewIsSupported("WGL_ARB_create_context") == 1)
{
*hRC = wglCreateContextAttribsARB(*hDC, 0, attribs);
wglMakeCurrent(NULL, NULL);
wglDeleteContext(tempContext);
wglMakeCurrent(*hDC, *hRC);
}
else{ *hRC = tempContext; }
const char* GLVersionString = (char*) glGetString(GL_VERSION);
int OpenGLVersion[2];
glGetIntegerv(GL_MAJOR_VERSION, &OpenGLVersion[0]);
glGetIntegerv(GL_MINOR_VERSION, &OpenGLVersion[1]);
}
GLvoid OpenGL::PrepareOpenGLScene(GLvoid)
{
glClearColor(0.0f, 0.6f, 1.0f, 0.0f);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
}
GLvoid OpenGL::RenderGLScene(GLvoid)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
/* Begin OpenGL Rendering */
/* End OpenGL Rendering */
}
GLvoid OpenGL::ResizeGLScene(int w, int h)
{
float ratio = 1.0 * w/h;
if(h == 0)
h = 1;
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0f, ratio, 0.1f, 1000.0f);
glViewport(0, 0, w, h);
}
GLvoid OpenGL::ProgramIcon(HWND hwnd)
{
HICON hIcon, hIconSm;
hIcon = (HICON) LoadImage(NULL, _T("data/icon.ico"), IMAGE_ICON, 32, 32, LR_LOADFROMFILE);
if(hIcon)
SendMessage(hwnd, WM_SETICON, ICON_BIG, (LPARAM)hIcon);
else
MessageBox(NULL, _T("Could not load the big icon! :("), _T("Error!"), MB_OK | MB_ICONERROR);
//---------------------------------------------------------------------------------------------//
hIconSm = (HICON) LoadImage(NULL, _T("data/icon.ico"), IMAGE_ICON, 16, 16, LR_LOADFROMFILE);
if(hIconSm)
SendMessage(hwnd, WM_SETICON, ICON_SMALL, (LPARAM)hIconSm);
else
MessageBox(NULL, _T("Could not load the small icon! :("), _T("Error!"), MB_OK | MB_ICONERROR);
}
GLvoid OpenGL::KillOpenGL(HWND hwnd, HDC hDC, HGLRC hRC)
{
wglMakeCurrent(NULL, NULL);
wglDeleteContext(hRC);
ReleaseDC(hwnd, hDC);
}
すべてのレンダリングコードが "RenderGLScene" の内側に行くだろう関数をOpenGL.cppの内部に置いていますが、画面上に三角形や四角形などの基本的なものを描画するコードを置くと、何も表示されません。私は "gluLookAt（）"関数と "gluPerspective（）"関数を使って、それらが私の問題の原因かもしれないと思っているので、私は試してみました。私は、両方のVBOとglBegin（）/ glEnd（）を使用する古いメソッドを試してみました。
gluPerspective呼び出しで問題はありません。 gluLookAtはどこにも表示されず、オブジェクトの実際のレンダリングも表示されません。あなたの実際のレンダリングコードを追加してください。あなたがしていることを推測するために私たちを残さないでください。また、開発中にglGetErrorを描画ループ内に少なくとも1か所に配置すると、問題があるかどうかがわかります。 – Tim