Im trying to make a game with sdl. but the problem is as the scene gets more complicated (lots of objects), the input is lagging. I dont notice any fps drop, it runs smooth. but the input delays raised as i put more object. I use SDL for osx template from this website http://www.meandmark.com/sdlopenglpart1.html
This is the snipplet for the application related to the loop and event.
#include "GameApp.h"
using namespace std;
void GameApp::setOrthographicProjection() {
// switch to projection mode
glMatrixMode(GL_PROJECTION);
// save previous matrix which contains the
//settings for the perspective projection
glPushMatrix();
// reset matrix
glLoadIdentity();
// set a 2D orthographic projection
gluOrtho2D(0, width, height, 0);
// switch back to modelview mode
glMatrixMode(GL_MODELVIEW);
}
// Constructor
GameApp::GameApp(void)
{
done = false;
//drawContext = NULL;
}
// Destructor
GameApp::~GameApp(void)
{
}
// Initialization functions
void GameApp::InitApp(void)
{
width = 1280;
height = 720;
InitializeSDL();
InstallTimer();
}
void GameApp::InitializeSDL(void)
{
int error;
SDL_Surface* drawContext;
error = SDL_Init(SDL_INIT_EVERYTHING);
// Create a double-buffered draw context
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
Uint32 flags;
flags = SDL_OPENGL;// | SDL_FULLSCREEN;
drawContext = SDL_SetVideoMode(width, height, 0, flags);
Control::leftButton.value = false;
Control::rightButton.value = false;
Control::upButton.value = false;
Control::downButton.value = false;
}
void GameApp::InstallTimer(void)
{
timer = SDL_AddTimer(10, GameLoopTimer, this);
}
Uint32 GameApp::GameLoopTimer(Uint32 interval, void* param)
{
// Create a user event to call the game loop.
SDL_Event event;
event.type = SDL_USEREVENT;
event.user.code = RUN_GAME_LOOP;
event.user.data1 = 0;
event.user.data2 = 0;
SDL_PushEvent(&event);
return interval;
}
// Cleanup functions
void GameApp::Cleanup(void)
{
SDL_bool success;
success = SDL_RemoveTimer(timer);
SDL_Quit();
}
// Event-related functions
void GameApp::EventLoop(void)
{
SDL_Event event;
while((!done) && (SDL_WaitEvent(&event))) {
if(event.type == SDL_MOUSEMOTION)
{
Control::mousePos.x = event.motion.x;//(float)value[0]*1600.0 - 800.0;
Control::mousePos.y = height - event.motion.y;//(float)value[1]*1600.0 - 800.0;
}
if (event.type == SDL_USEREVENT) {
HandleUserEvents(&event);
}
if (event.button.button == SDL_BUTTON_LEFT) {
if( event.type == SDL_MOUSEBUTTONDOWN )
{
Control::mouseLeftButton.value = true;
} else if (event.type == SDL_MOUSEBUTTONUP) {
Control::mouseLeftButton.value = false;
}
}
//If a key was pressed
if( event.type == SDL_KEYDOWN ) {
if ( event.key.keysym.sym == 'a') Control::leftButton = true;
if ( event.key.keysym.sym == 'd') Control::rightButton = true;
if ( event.key.keysym.sym == 'w') Control::upButton = true;
if ( event.key.keysym.sym == 's') Control::downButton = true;
} else if(event.type == SDL_KEYUP) {
if ( event.key.keysym.sym == 'a') Control::leftButton = false;
if ( event.key.keysym.sym == 'd') Control::rightButton = false;
if ( event.key.keysym.sym == 'w') Control::upButton = false;
if ( event.key.keysym.sym == 's') Control::downButton = false;
}
}
}
void GameApp::HandleUserEvents(SDL_Event* event)
{
switch (event->user.code) {
case RUN_GAME_LOOP:
GameLoop();
break;
default:
break;
}
}
// Game related functions
void GameApp::GameLoop(void)
{
Uint32 now = SDL_GetTicks();
float nowf = now*1.0/1000.0;
gm.update(nowf);
SDL_GL_SwapBuffers();
}
any1 notice whats wrong with my code?
Thanks in advance
