c++ - SDL+OpenGL 程序没有出现在 linux 上

Question

我开始在 Windows 上使用 SDL 和 OpenGL 制作这个 super 简单的游戏引擎。引擎位于静态库中，到目前为止它所做的只是显示一个蓝色窗口，其中包含引擎的所有基础工作。

它在 Windows 上运行良好，但后来我将它移植到 Linux 上却一无所获。该程序运行良好，并显示在系统监视器中，但没有出现窗口。我安装了几个 mesa 和 gl 库来检查是不是。现在它不会运行并说进程以状态 -1 终止。

这是引擎中的初始化代码。请询问其他任何内容。

#include "Scales.h"
#include "SDL/SDL.h"
#include "gl.h"
#include "glu.h"

Engine *scalesEngine;

bool OnInit(int WindowHeight, int WindowWidth){

    SDL_Surface* Surf_Display;

    if(SDL_Init(SDL_INIT_EVERYTHING) < 0) {
        return false;
   }
    SDL_GL_SetAttribute(SDL_GL_RED_SIZE,        8);
    SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE,      8);
    SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE,       8);
    SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE,      8);

    SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE,      16);
    SDL_GL_SetAttribute(SDL_GL_BUFFER_SIZE,        32);

    SDL_GL_SetAttribute(SDL_GL_ACCUM_RED_SIZE,    8);
    SDL_GL_SetAttribute(SDL_GL_ACCUM_GREEN_SIZE,    8);
    SDL_GL_SetAttribute(SDL_GL_ACCUM_BLUE_SIZE,    8);
    SDL_GL_SetAttribute(SDL_GL_ACCUM_ALPHA_SIZE,    8);

    SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS,  1);
    SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES,  2);

   if((Surf_Display = SDL_SetVideoMode(WindowWidth, WindowHeight, 32, SDL_HWSURFACE | SDL_GL_DOUBLEBUFFER | SDL_OPENGL)) = NULL){
        return false;
   }

   glClearColor(0.422f,0.576f,1.0f,1.0f);
   glClearDepth(1.0f);

   glViewport(0, 0, WindowWidth, WindowHeight);

   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();

   glOrtho(0, WindowWidth, WindowHeight, 0, 1, -1);

   glMatrixMode(GL_MODELVIEW);

   glEnable(GL_TEXTURE_2D);

   glLoadIdentity();

   game_Init();

   return true;
}

int main(int argc, char* argv[]){

    scalesEngine = new Engine;

    game_preload();

    if(OnInit(scalesEngine->WindowHeight(), scalesEngine->WindowWidth()) == false){
        return -1;
    }

    SDL_Event Event;

    //Main Game Loop
    while(scalesEngine->Running){

        while(SDL_PollEvent(&Event)){
            scalesEngine->OnEvent(&Event);
        }


        scalesEngine->Update();
        scalesEngine->Render();
    }

    scalesEngine->OnCleanUp();
    delete scalesEngine;

    return 0;
}

Answer 1

if((Surf_Display = SDL_SetVideoMode(WindowWidth, WindowHeight, 32, SDL_HWSURFACE | SDL_GL_DOUBLEBUFFER | SDL_OPENGL)) = NULL){
    return false;
}

我很确定你的意思是 == NULL，对吧？