我有一个小框架，在无边框的屏幕窗口中显示纹理，但是当我启动它时，应用程序在我激活OpenGL窗口时显示一个忙碌的鼠标图标，我似乎无法理解它来自哪里。
以下代码是完整的解决方案（Visual Studio 2010），应该按原样编译。 不幸的是我甚至不知道从哪里开始寻找，因此我在这里复制了完整的代码。 BasicProject创建一个随机纹理，并将其输入OpenGL窗口。
任何人都可以看到为什么代码陷入繁忙的窗口？ 从来没有达到过OpenGL回调，但我不明白为什么不这样做。
BasicProject.cpp（切入点）：
/** Sample Project for OpenGL-Display functionality
*
* Anton Roth, 2013
*/
#include "stdafx.h"
#include <conio.h>
#include <process.h>
#include <vector>
#include <Windows.h>
#include <cstdlib>
#include <ctime>
#include "OpenGL-Display.h"
void RunOpenGL(void* pParams);
bool applicationRunning = true;
HANDLE threadOGL;
int _tmain(int argc, _TCHAR* argv[]) {
OGD::OpenGLDisplay_Init(640, 480, 200, 200, 0, "First Display");
threadOGL = (HANDLE)_beginthread(RunOpenGL, 0, NULL);
while(!_kbhit()) {
Sleep(500);
}
applicationRunning = false;
WaitForSingleObject( threadOGL, 500 );
return 0;
}
void RunOpenGL(void* pParams) {
std::vector<char> texture;
texture.resize(640 * 480 * 3);
std::srand(time(0));
while(applicationRunning) {
for(int i = 0; i < 640 * 480 * 3; ++i) {
texture.at(i) = std::rand() % 255;
}
OGD::OpenGLDisplay_Wrapper(&texture.at(0), 640, 480, false, 24, 0);
int x, y;
OGD::OpenGLDisplay_MousePos(x, y, 0);
Sleep(300);
}
}
OpenGL的Display.h：
#ifndef __OPENGLDISPLAY
#define __OPENGLDISPLAY
#include <windows.h> // Header File For Windows
#include <stdio.h> // Header File For Standard Input/Output
#include <gl\gl.h> // Header File For The OpenGL32 Library
#include <gl\glu.h> // Header File For The GLu32 Library
#include <vector>
namespace OGD
{
class OpenGL_Display
{
public:
OpenGL_Display(int newId);
~OpenGL_Display();
void Init_Display(int width, int height, int posX, int posY, LPCSTR className);
void DrawNewImage(int width, int height, char* imageData, bool flip, int bpp);
void GetMouseCords(int& x, int& y);
int ID;
protected:
bool CreateGLWindow(char* title, int bits, int posX, int posY, LPCSTR className);
GLvoid ReSizeGLScene(GLsizei width, GLsizei height);
int LoadGLTextures();
int InitGL(GLvoid);
void UpdateGLBuffers(int width, int height, char* imageData, int bpp);
int DrawGLScene(bool flip);
GLvoid KillGLWindow(GLvoid);
HDC hDC; // Private GDI Device Context
static LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); // Declaration For WndProc
HGLRC hRC; // Permanent Rendering Context
HWND hWnd; // Holds Our Window Handle
HINSTANCE hInstance; // Holds The Instance Of The Application
bool keys[256]; // Array Used For The Keyboard Routine
bool active; // Window Active Flag Set To TRUE By Default
bool fullscreen; // Fullscreen Flag Set To Fullscreen Mode By Default
bool g_bExitThread; // end thread
GLuint texture; // Bitmap image buffer
int g_iCounter; // Current buffer being grabbed to
bool g_GLdone; // Counter to make sure no unnecessary updates are made which cause CPU load
int xPos;
int yPos;
int xPos_right;
int yPos_right;
int width;
int height;
};
static std::vector<OGD::OpenGL_Display*> oglDisp;
void OpenGLDisplay_Wrapper(char* image, int width, int height, bool flip, int bpp, int ID);
void OpenGLDisplay_Init(int width, int height, int posX, int posY, int ID, LPCSTR className);
void OpenGLDisplay_MousePos(int&x, int&y, int ID);
};
#endif
OpenGL的Display.cpp：
/** Based on code by NeHe tutorials
Adapted to display live camera display with OpenGL
*/
#include "OpenGL-Display.h"
using namespace OGD;
OpenGL_Display::OpenGL_Display(int newId)
{
xPos = -1;
yPos = -1;
ID = newId;
width = 1;
height = 1;
}
OpenGL_Display::~OpenGL_Display()
{
KillGLWindow();
}
void OpenGL_Display::Init_Display(int newWidth, int newHeight, int posX, int posY, LPCSTR inputName)
{
width = newWidth;
height = newHeight;
className = inputName;
if (!CreateGLWindow((char*)className, 24, posX, posY, className))
{
throw;
}
}
LRESULT CALLBACK OpenGL_Display::WndProc( HWND hWnd, // Handle For This Window
UINT uMsg, // Message For This Window
WPARAM wParam, // Additional Message Information
LPARAM lParam) // Additional Message Information
{
switch (uMsg) // Check For Windows Messages
{
case WM_SYSCOMMAND: // Intercept System Commands
{
switch (wParam) // Check System Calls
{
case SC_SCREENSAVE: // Screensaver Trying To Start?
case SC_MONITORPOWER: // Monitor Trying To Enter Powersave?
return 0; // Prevent From Happening
}
break; // Exit
}
case WM_CLOSE: // Did We Receive A Close Message?
{
PostQuitMessage(0); // Send A Quit Message
return 0; // Jump Back
}
case WM_SIZE: // Resize The OpenGL Window
{
oglDisp.at(0)->ReSizeGLScene(LOWORD(lParam),HIWORD(lParam)); // LoWord=Width, HiWord=Height
return 0; // Jump Back
}
}
// Pass All Unhandled Messages To DefWindowProc
return DefWindowProc(hWnd,uMsg,wParam,lParam);
}
bool OpenGL_Display::CreateGLWindow(char* title, int bits, int posX, int posY, LPCSTR className)
{
GLuint PixelFormat; // Holds The Results After Searching For A Match
WNDCLASS wc; // Windows Class Structure
DWORD dwExStyle; // Window Extended Style
DWORD dwStyle; // Window Style
RECT WindowRect; // Grabs Rectangle Upper Left / Lower Right Values
WindowRect.left=(long)0; // Set Left Value To 0
WindowRect.right=(long)width; // Set Right Value To Requested Width
WindowRect.top=(long)0; // Set Top Value To 0
WindowRect.bottom=(long)height; // Set Bottom Value To Requested Height
hInstance = GetModuleHandle(NULL); // Grab An Instance For Our Window
wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC; // Redraw On Size, And Own DC For Window.
wc.lpfnWndProc = WndProc; // WndProc Handles Messages
wc.cbClsExtra = 0; // No Extra Window Data
wc.cbWndExtra = 0; // No Extra Window Data
wc.hInstance = hInstance; // Set The Instance
wc.hIcon = LoadIcon(NULL, IDI_WINLOGO); // Load The Default Icon
wc.hCursor = LoadCursor(NULL, IDC_ARROW); // Load The Arrow Pointer
wc.hbrBackground = NULL; // No Background Required For GL
wc.lpszMenuName = NULL; // We Don't Want A Menu
wc.lpszClassName = className; // Set The Class Name
RegisterClass(&wc); // Return FALSE
dwExStyle=WS_EX_APPWINDOW | WS_EX_WINDOWEDGE; // Window Extended Style
dwStyle=WS_VISIBLE | WS_POPUP | WS_CLIPSIBLINGS | WS_CLIPCHILDREN;; // Windows Style
AdjustWindowRectEx(&WindowRect, dwStyle, FALSE, dwExStyle); // Adjust Window To True Requested Size
//HWND hwndC = GetConsoleWindow();
// Create The Window
hWnd=CreateWindowEx( dwExStyle, // Extended Style For The Window
className, // Class Name
title, // Window Title
//WS_OVERLAPPEDWINDOW,
dwStyle | // Defined Window Style
WS_CLIPSIBLINGS | // Required Window Style
WS_CLIPCHILDREN, // Required Window Style
posX, posY, // Window Position
WindowRect.right-WindowRect.left, // Calculate Window Width
WindowRect.bottom-WindowRect.top, // Calculate Window Height
NULL, // No Parent Window
NULL, // No Menu
hInstance, // Instance
NULL);
static PIXELFORMATDESCRIPTOR pfd= // pfd Tells Windows How We Want Things To Be
{
sizeof(PIXELFORMATDESCRIPTOR), // Size Of This Pixel Format Descriptor
1, // Version Number
PFD_DRAW_TO_WINDOW | // Format Must Support Window
PFD_SUPPORT_OPENGL | // Format Must Support OpenGL
PFD_DOUBLEBUFFER, // Must Support Double Buffering
PFD_TYPE_RGBA, // Request An RGBA Format
bits, // Select Our Color Depth
0, 0, 0, 0, 0, 0, // Color Bits Ignored
0, // No Alpha Buffer
0, // Shift Bit Ignored
0, // No Accumulation Buffer
0, 0, 0, 0, // Accumulation Bits Ignored
16, // 16Bit Z-Buffer (Depth Buffer)
0, // No Stencil Buffer
0, // No Auxiliary Buffer
PFD_MAIN_PLANE, // Main Drawing Layer
0, // Reserved
0, 0, 0 // Layer Masks Ignored
};
hDC=GetDC(hWnd);
PixelFormat=ChoosePixelFormat(hDC,&pfd);
SetPixelFormat(hDC,PixelFormat,&pfd);
hRC=wglCreateContext(hDC);
wglMakeCurrent(hDC,hRC);
ShowWindow(hWnd,SW_SHOW); // Show The Window
SetForegroundWindow(hWnd); // Slightly Higher Priority
SetFocus(hWnd); // Sets Keyboard Focus To The Window
ReSizeGLScene(width, height); // Set Up Our Perspective GL Screen
InitGL();
return TRUE; // Success
}
int OpenGL_Display::LoadGLTextures() // Load Bitmaps And Convert To Textures
{
// Load The Bitmap, Check For Errors, If Bitmap's Not Found Quit
glGenTextures(1, &texture); // Create The Texture
// Typical Texture Generation Using Data From The Bitmap
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST); // Minimizing filter, in case display is smaller image size
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST); // Magnifying filter, in case display is smaller image size
return 1; // Return The Status
}
GLvoid OpenGL_Display::ReSizeGLScene(GLsizei newWidth, GLsizei newHeight) // Resize And Initialize The GL Window
{
width = newWidth;
height = newHeight;
}
int OpenGL_Display::InitGL(GLvoid) // All Setup For OpenGL Goes Here
{
if (!LoadGLTextures()) // Jump To Texture Loading Routine
{
return FALSE; // If Texture Didn't Load Return FALSE
}
return TRUE; // Initialization Went OK
}
void OpenGL_Display::GetMouseCords(int& x, int& y) // All Setup For OpenGL Goes Here
{
x = xPos;
y = yPos;
}
void OpenGL_Display::UpdateGLBuffers(int width, int height, char* imageData, int bpp) {
glBindTexture(GL_TEXTURE_2D, texture);
switch(bpp) {
case 8: glTexImage2D(GL_TEXTURE_2D, 0, GL_INTENSITY, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, imageData); break;
case 16: glTexImage2D(GL_TEXTURE_2D, 0, GL_INTENSITY, width, height, 0, GL_RED, GL_UNSIGNED_SHORT, imageData); break;
case 24: glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, imageData); break;
default: return;
}
GLenum mError = glGetError();
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
}
int OpenGL_Display::DrawGLScene(bool flip) // Here's Where We Do All The Drawing
{
if (height==0) // Prevent A Divide By Zero
{
height=1; // Making Height Equal One
}
glViewport(0,0,width,height); // Reset The Current Viewport
glMatrixMode(GL_PROJECTION); // Select The Projection Matrix
glLoadIdentity(); // Reset The Projection Matrix
// Calculate The Aspect Ratio Of The Window
gluPerspective(25.0f,1.0f,0.1f,100.0f);
glMatrixMode(GL_MODELVIEW); // Select The Modelview Matrix
glLoadIdentity(); // Reset The Modelview Matrix
glEnable(GL_TEXTURE_2D); // Enable Texture Mapping
glShadeModel(GL_SMOOTH); // Enable Smooth Shading
glClearColor(0.0f, 0.0f, 0.0f, 0.5f); // Black Background
glClearDepth(1.0f); // Depth Buffer Setup
glDisable(GL_DEPTH_TEST); // Enables Depth Testing
glDepthFunc(GL_LEQUAL); // The Type Of Depth Testing To Do
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); // Really Nice Perspective Calculations
GLenum mError = glGetError();
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear The Screen And The Depth Buffer
glLoadIdentity(); // Reset The View
glTranslatef(0.0f,0.0f,-5.0f);
mError = glGetError();
glBindTexture(GL_TEXTURE_2D, texture);
mError = glGetError();
glColor4f(1.0, 1.0, 1.0, 1.0);
mError = glGetError();
if(flip)
{
glBegin(GL_QUADS);
// Front Face
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 0.5f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 0.5f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 0.5f);
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 0.5f);
glEnd();
mError = glGetError();
}
else
{
glBegin(GL_QUADS);
// Front Face
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, -1.0f, 0.5f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, -1.0f, 0.5f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, 1.0f, 0.5f);
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, 1.0f, 0.5f);
glEnd();
mError = glGetError();
}
mError = glGetError();
return TRUE; // Keep Going
}
GLvoid OpenGL_Display::KillGLWindow(GLvoid) // Properly Kill The Window
{
if (fullscreen) // Are We In Fullscreen Mode?
{
ChangeDisplaySettings(NULL,0); // If So Switch Back To The Desktop
ShowCursor(TRUE); // Show Mouse Pointer
}
if (hRC) // Do We Have A Rendering Context?
{
wglMakeCurrent(NULL,NULL);
wglDeleteContext(hRC);
hRC=NULL; // Set RC To NULL
}
ReleaseDC(hWnd,hDC);
DestroyWindow(hWnd);
UnregisterClass("OpenGL_Display",hInstance);
}
void OpenGL_Display::DrawNewImage(int width, int height, char* imageData, bool flip, int bpp)
{
BOOL returnVal = wglMakeCurrent(hDC, hRC);
UpdateGLBuffers(width, height, imageData, bpp);
DrawGLScene(flip);
SwapBuffers(hDC);
wglMakeCurrent(NULL, NULL);
}
void OGD::OpenGLDisplay_Init(int width, int height, int posX, int posY, int ID, LPCSTR className)
{
for(unsigned int i = 0; i < oglDisp.size(); ++i) {
if(oglDisp.at(i)->ID == ID) {
return;
}
}
oglDisp.push_back(new OGD::OpenGL_Display(ID));
oglDisp.at(oglDisp.size()-1)->Init_Display(width, height, posX, posY, className); //by default this ID is latest
wglMakeCurrent(NULL, NULL);
GLenum mError = glGetError();
}
void OGD::OpenGLDisplay_Wrapper(char* image, int width, int height, bool flip, int bpp, int ID)
{
for(unsigned int i = 0; i < oglDisp.size(); ++i) {
if(oglDisp.at(i)->ID == ID) {
oglDisp.at(i)->DrawNewImage(width, height, image, flip, bpp);
return;
}
}
}
答案 0 :(得分：1)
即使您的窗口是基于OpenGL的，您也应该创建一个消息循环并重复调用GetMessage，TranslateMessage和DispatchMessage。处理WM_PAINT，即使它不需要绘制任何东西。如果您不这样做，Windows会认为您的应用程序没有响应，并显示忙碌的光标（或更糟糕的是，显示“应用程序无响应”对话框。）