CODEWITHSUNDEEP
c++linuxopenglsdl
DavidColson
DavidColson

Reputation: 8587

SDL+OpenGL program not appearing on linux

I started making this super simple game engine with SDL and OpenGL on windows. The Engine is in a static lib and the so far all it does is display a blue window, with all the ground work for an engine.

It ran fine on Windows but then I ported it to Linux and nothing. The program runs fine and is shown in the system monitor but no window is appearing. I installed a couple of mesa and gl libs to check that wasn't it. Now it wont run and says process terminated with status -1.

This is the initialization code in the engine. Please ask for anything else.

#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;
}

Upvotes: 1

Views: 337

Answers (2)

Tom Kerr
Tom Kerr

Reputation: 10720

If you do not get a window, I would suspect that you are not getting your hardware context. Try using SDL_SWSURFACE instead of SDL_HWSURFACE.

SDL_SetVideoMode(... SDL_SWSURFACE ...

I've seen this happen when developing in a VM, though I'm sure there are other reasons.

edit:

As noted in the comments, both of these surface flags may be superfluous along with SDL_OPENGL anyway.

Upvotes: 0

TheBuzzSaw
TheBuzzSaw

Reputation: 8826

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

I'm pretty sure you meant == NULL, right?

Upvotes: 3

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