Very well, I spent some time with this code.
The example out of the french wiki compiles well. But as far as I understand its functionality, it doesnt really show how the split sceen works.
Shouldn't the process be like:
1. clear the screen
2. draw some stuff in the first part
3. call this gl scissor
4. clear the screen (now this only clears the "second part" as defined by the rectangle)
5. draw some stuff (origin of coordinates lies in the top left of the defined rect)
6. unsplit
The example seems to draw only in the "second part". So no split screen effect is shown. Or am I completly wrong with my interpretation??
Believing that it works like mentioned I tried to implement it and ran into the following error (being displayed in the "shell" when running the app):
"Failed to get device context of window - cannot create OpenGL context"
The code for this nice error:
main.cpp
#include "cGame.h"
int main()
{
cGame game;
game.run();
return 1;
}
cGame.h
#ifndef C_GAME_H
#define C_GAME_H
#include <SFML/Graphics.hpp>
//Consts
const int SCREEN_WIDTH = 800;
const int SCREEN_HEIGHT = 800;
const int GAME_FPS = 60;
class cGame
{
public:
cGame(void);
~cGame(void);
void run(void);
private:
bool isRunning;
sf::RenderWindow *Display;
inline void SplitOn(const sf::RenderWindow& Window, const sf::Rect<int>& Zone);
inline void SplitOff();
void handleGameEvents(void);
};
#endif
cGame.cpp
#include "cGame.h"
cGame::cGame(void)
{
Display = new sf::RenderWindow(sf::VideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, 32),"MoonSpire",sf::Style::Close);
Display->SetFramerateLimit(GAME_FPS);
isRunning = true;
}
cGame::~cGame(void)
{
}
inline void cGame::SplitOn(const sf::RenderWindow& Window, const sf::Rect<int>& Zone)
{
glEnable (GL_SCISSOR_TEST);
glScissor(Zone.Left, Window.GetHeight() - Zone.Bottom, Zone.GetWidth(), Zone.GetHeight());
}
inline void cGame::SplitOff()
{
glDisable (GL_SCISSOR_TEST);
}
void cGame::run(void)
{
char runLvl = 2;
// Start game loop
while (isRunning)
{
switch(runLvl)
{
// Menulvl
case 0:
break;
// Create gamestuff
case 1:
break;
// Load game
case 2:
// draw first half of screen
Display->Clear();
sf::Sprite Test;
Test.Resize(20, 40); // "vertical block"
for (int y=0; y<10; y++)
{
for(int x=0; x<10; x++)
{
Test.SetPosition(x*70 + 50, y*50 + 70);
Display->Draw(Test);
}
}
// draw second half of screen
sf::Rect<int> Zone(SCREEN_WIDTH/2, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
SplitOn(Display, Zone);
Display->Clear();
sf::Sprite Test2;
Test2.Resize(40, 20); // "horizontal block"
for (int y=0; y<10; y++)
{
for(int x=0; x<10; x++)
{
Test2.SetPosition(x*70 + 50, y*50 + 70);
Display->Draw(Test2);
}
}
Display->Display();
handleGameEvents();
SplitOff();
break;
}
}
}
void cGame::handleGameEvents(void)
{
sf::Event Event;
while (Display->GetEvent(Event))
{
// Close window : exit
if (Event.Type == sf::Event::Closed)
{
isRunning = false;
break;
}
// Escape key : exit
if ((Event.Type == sf::Event::KeyPressed) && (Event.Key.Code == sf::Key::Escape))
{
isRunning = false;
break;
}
}
}
Thanks for assistance!
