[英]SDL OpenGL window instantly closes
所以我刚刚开始玩sdl,我让它在一个单独的类中工作正常但由于某种原因,当我将事物分成单独的类时,显示打开一个insta关闭。 一个想法?
主类标题
#pragma once
#include <SDL.h>
#include <glew.h>
#include <iostream>
#include "Input.h"
#include "Display.h"
#include "RenderingEngine.h"
#include "PhysicsEngine.h"
class Main
{
public:
Main();
~Main();
/* Engine settings & Engine Controlls*/
void start();
void stop();
void pause(bool value);
void run();
private:
/* Loop Controllers */
bool running;
bool paused;
/* Engine Initialisation */
void initSDL();
RenderingEngine render_core = RenderingEngine(4, 2);
PhysicsEngine physics_core = PhysicsEngine();
Display display = Display("game engine", 900, 900, 900, 600, SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL);
Input input;
};
主类
#include "Main.h"
Main::Main()
{
initSDL();
start();
}
Main::~Main()
{
}
void Main::initSDL()
{
SDL_Init(SDL_INIT_EVERYTHING);
}
void Main::start()
{
if (running) return;
running = true;
run();
}
void Main::stop()
{
if (!running) return;
running = false;
exit(0);
}
void Main::pause(bool value)
{
paused = value;
}
void Main::run()
{
while (running)
{
if (!paused)
{
}
render_core.render();
display.swapBackBuffer();
input.update();
}
}
int main(int argc, char *argv[])
{
Main engine;
return 0;
}
显示标题
#pragma once
#include <iostream>
#include <SDL.h>
class Display
{
public:
Display(const char* name, int x, int y, int w, int h, Uint32 flags);
~Display();
void swapBackBuffer();
private:
int x;
int y;
int w;
int h;
const char* name;
Uint32 flags;
SDL_Window *window;
SDL_GLContext opengl;
};
显示类
#include "Display.h"
Display::Display(const char* n, int x, int y, int w, int h, Uint32 f)
{
this->x = x;
this->y = y;
this->w = w;
this->h = h;
this->name = name;
this->flags = flags;
this->window = SDL_CreateWindow(n, x, y, w, h, f);
this->opengl = SDL_GL_CreateContext(window);
SDL_GL_MakeCurrent(window, opengl);
printf("Display: initialised\n\n");
}
Display::~Display()
{
SDL_GL_DeleteContext(opengl);
SDL_DestroyWindow(window);
printf("Display: destroyed\n\n");
}
void Display::swapBackBuffer()
{
SDL_GL_SwapWindow(window);
}
渲染引擎类......标题中没有任何重要内容
#include "RenderingEngine.h"
RenderingEngine::RenderingEngine(int major_version, int minor_version)
{
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, major_version);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, minor_version);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 32);
setClearColour(0, 0, 0, 1);
printf("Rendering Engine:: initialised\n\n");
}
RenderingEngine::~RenderingEngine()
{
printf("Rendering Engine:: destroyed\n");
}
void RenderingEngine::setClearColour(float r, float g, float b, float a)
{
glClearColor(r, g, b, a);
}
void RenderingEngine::clearScreen()
{
glClear(GL_COLOR_BUFFER_BIT || GL_DEPTH_BUFFER_BIT);
}
void RenderingEngine::render()
{
clearScreen();
}
输入类
#include "Input.h"
Input::Input()
{
printf("Input:: initialised\n");
}
Input::~Input()
{
printf("Input:: destroyed\n");
}
void Input::setMouseVisabilityTo(bool value)
{
if (value) SDL_ShowCursor(1);
else SDL_ShowCursor(0);
}
int Input::getMouseX()
{
return mouseX;
}
int Input::getMouseY()
{
return mouseY;
}
void Input::update()
{
while (SDL_PollEvent(&event))
{
switch (event.type)
{
case SDL_QUIT:
break;
case SDL_KEYDOWN:
keyboard[event.key.keysym.sym] = true;
break;
case SDL_KEYUP:
keyboard[event.key.keysym.sym] = false;
break;
case SDL_MOUSEBUTTONDOWN:
mouse[event.button.button] = true;
break;
case SDL_MOUSEBUTTONUP:
mouse[event.button.button] = false;
break;
case SDL_MOUSEWHEEL:
break;
case SDL_MOUSEMOTION:
mouseX = event.button.x;
mouseY = event.button.y;
break;
}
}
}
我知道有很多文件,所以非常感谢帮助,这已经困扰了我一段时间了
我编辑的main.h文件
#include "Display.h"
#include "RenderingEngine.h"
#include "PhysicsEngine.h"
class Main
{
public:
Main() :
render_core(4, 2),
display("game engine", 900, 900, 900, 600, SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL),
physics_core(),
input()
{
running = false;
paused = false;
initSDL();
start();
}
~Main();
/* Engine settings & Engine Controlls*/
void start();
void stop();
void pause(bool value);
void run();
private:
/* Loop Controllers */
bool running;
bool paused;
/* Engine Initialisation */
void initSDL();
RenderingEngine render_core;
PhysicsEngine physics_core;
Display display;
Input input;
这是一些奇怪的C ++版本( 例如 C ++ 11),您可以在同一语句中声明和初始化非静态成员变量吗?
你不应该做那种事情,构建和初始化渲染上下文与其他软件相关的顺序非常重要。 这就是构造函数的用途。
假设你实际上是故意( ab )在这里使用C ++ 11,你的窗口会立即关闭,因为这句话:
Display display = Display("game engine", 900, 900, 900, 600, SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL);
构造一个Display
对象,然后创建该对象的副本并将其分配给display
。 在此语句“返回”之后,原始对象将被销毁。
看看Display
的析构函数:
Display::~Display()
{
SDL_GL_DeleteContext(opengl);
SDL_DestroyWindow(window);
printf("Display: destroyed\n\n");
}
长话短说,不要以这种方式初始化你的成员。 在C ++ 11出现之前,构造函数非常精细,让生活变得更加困难。
请考虑以下构造函数 :
Main () : render_core (4, 2),
display ("game engine", 900, 900, 900, 600, SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL),
physics_core ()
{
initSDL ();
start ();
}
...
private:
RenderingEngine render_core;
PhysicsEngine physics_core;
Display display;
该解决方案在构造Main
时初始化Main
所有成员,没有任何复制分配,并且与更广泛的C ++编译器兼容。 此代码中没有临时的Display
对象意味着您的窗口不会被创建,然后立即被销毁。
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