class CFGapp
{
...
public:
void RenderScene(void); // Draws everything on the screen
...
};glutDisplayFunc(RenderScene); // Our display function...
class CFGapp{public: void RenderScene(void); // Draws everything on the screen};void (CFGapp::* pmf)(void); // pointer to member functionpmf = &CFGapp::RenderScene; // Assign the function to the pointerCFGapp App; // The object we're going to call the function on.CFGapp *pApp = &App; // To show the two forms.(App.*pmf)(); // Call via object(pApp->*pmf)(); // Call via object pointerclass CFGapp{ public: void RenderScene(); static void Render(){application.RenderScene();} private: static CFGapp application;};glutDisplayFunc(GFGapp::Render);class CFGapp{ public: void RenderScene();};CFGapp application;void Render(){ application.RenderScene();}glutDisplayFunc(Render);Thanks Enigma , i found this topic from google. Your first example does not works, cannot use the object context with dynamic vars, but the second example works fine. My solution is call the init functions of glut from main file without class and call the class for drawing from static function:
#include <time.h>
#include "core/Log.h"
#include "core/Core.h"
Log log;
Core core; // <- The solution (Declare out of main function
// and call the consructor, make the context)
clock_t last_clock;
float fps = 60.0; // Limit to 60 FPS
void draw()
{
core.draw(); // <- The solution (call object function)
// Limit FPS
while((((float)clock() - (float)last_clock) / (float)CLOCKS_PER_SEC) < (1.0 / fps)){}
last_clock = clock();
glutPostRedisplay();
}
int main(int argc, char **argv)
{
core.init();
last_clock = clock();
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE);
glutInitWindowSize(800, 800);
glutInitWindowPosition(100, 100);
glutCreateWindow("GLEngine");
glutDisplayFunc(draw); // <- The solution (call static function)
glutMainLoop();
return 0;
}In the Core object call the physical objects:
void Core::draw()
{
glClearColor(0.4, 0.4, 0.4, 1.0); // Background
glClear(GL_COLOR_BUFFER_BIT);
// Draw objects here ...
glFlush(); // Finish of drawing
}
