Fast Frame Rates but Still Ugly
Post: #16
1) Windowed.
2) ATI 9800 Pro
3) 20" Studio Display
4) Very simple timing method. I just simply calculate the time difference between the last frame and the current frame (Using GetCurrentEventTime() [Using Carbon]) and I use that number to multiply all my increment values (All increments are in units per seconds [eg. degree's rotation per second]).
1) I dunno about that, I wouldn't think there would be so much of a performance hit considering I'm on a Dual 2GHz G5 with 1GB RAM and only about 4 other small apps running... Even when I click inside the menus and move around it behaves exactly the same....
2) I'm under 10.3.4 currently, and I only have one OpenGL context...
3) I don't fix the rate of my frames at all, since everything is purely time based... Not exactly sure what you mean there.
4) That pretty much is my method, I let the app run as fast as possible and do everything according to the time difference with the last frame and the VBL sync does whatever it wants....
2) ATI 9800 Pro
3) 20" Studio Display
4) Very simple timing method. I just simply calculate the time difference between the last frame and the current frame (Using GetCurrentEventTime() [Using Carbon]) and I use that number to multiply all my increment values (All increments are in units per seconds [eg. degree's rotation per second]).
1) I dunno about that, I wouldn't think there would be so much of a performance hit considering I'm on a Dual 2GHz G5 with 1GB RAM and only about 4 other small apps running... Even when I click inside the menus and move around it behaves exactly the same....
2) I'm under 10.3.4 currently, and I only have one OpenGL context...
3) I don't fix the rate of my frames at all, since everything is purely time based... Not exactly sure what you mean there.
4) That pretty much is my method, I let the app run as fast as possible and do everything according to the time difference with the last frame and the VBL sync does whatever it wants....
Post: #17
So 3) and 4) don't apply. 1) and 2) still do. It doesn't matter how fast your CPU is-- the ATI drivers are broken. You might only have one context, but the window manager has dozens.
Try going fullscreen, capturing the display. Always solves my VBL problems.
Try going fullscreen, capturing the display. Always solves my VBL problems.
Post: #18
In my engine, I just setup a double buffered context and then I call aglSwapBuffers () or CGLFlushDrawable () in the end of my drawing/blitting routines. It seems these two commands swap the back and front buffers when the screen is being resfreshed. I experience no tearing or any artifacts whatsoever.
Post: #20
Sure here you go (it's in C++ for whatever it matters):
[then a buch of stuff]
Sorry about the large mass of code below. I thought it might help to see all of the initialization code I'm using. Anyways the vsync comes in pretty much 5 lines from the end.
Code:
#include <OpenGL/OpenGL.h>
#include "SDL_opengl.h"
#include "SDL.h"[then a buch of stuff]
Sorry about the large mass of code below. I thought it might help to see all of the initialization code I'm using. Anyways the vsync comes in pretty much 5 lines from the end.
Code:
/*
CreateMyWindow
creates the window
*/
void CreateMyWindow(const char * strWindowName, int width, int height, int VideoFlags)
{
MainWindow = SDL_SetVideoMode(width, height, SCREEN_DEPTH, VideoFlags); // SCREEN_DEPTH is macro for bits per pixel
if( MainWindow == NULL ) // if window creation failed
{
cerr << "Failed to Create Window : " << SDL_GetError() << endl; // report error
Quit(0);
}
SDL_WM_SetCaption(strWindowName, strWindowName); // set the window caption (first argument) and icon caption (2nd arg)
}
/*
SetupPixelFormat
sets the pixel format for OpenGL and video flags for SDL
*/
void SetupPixelFormat(void)
{
VideoFlags = SDL_OPENGL; //it's an openGL window
VideoFlags |= SDL_HWPALETTE; //exclusive access to hardware colour palette
VideoFlags |= SDL_RESIZABLE; //the window must be resizeable
VideoFlags |= SDL_FULLSCREEN; //make the window fullscreen
const SDL_VideoInfo * VideoInfo = SDL_GetVideoInfo(); // query SDL for information about our video hardware
if(VideoInfo == NULL) // if this query fails
{
cerr << "Failed getting Video Info : " << SDL_GetError() << endl; // report error
Quit(0);
}
if(VideoInfo -> hw_available) // is it a hardware surface
VideoFlags |= SDL_HWSURFACE;
else
VideoFlags |= SDL_SWSURFACE;
if(VideoInfo -> blit_hw) // is hardware blitting available
VideoFlags |= SDL_HWACCEL;
SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 ); // tell SDL that the GL drawing is going to be double buffered
SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, SCREEN_DEPTH); // size of depth buffer
SDL_GL_SetAttribute( SDL_GL_STENCIL_SIZE, 0); // we aren't going to use the stencil buffer
SDL_GL_SetAttribute( SDL_GL_ACCUM_RED_SIZE, 0); // this and the next three lines set the bits allocated per pixel -
SDL_GL_SetAttribute( SDL_GL_ACCUM_GREEN_SIZE, 0); // - for the accumulation buffer to 0
SDL_GL_SetAttribute( SDL_GL_ACCUM_BLUE_SIZE, 0);
SDL_GL_SetAttribute( SDL_GL_ACCUM_ALPHA_SIZE, 0);
}
/*
SizeOpenGLScreen
resizes the viewport for OpenGL
*/
void SizeOpenGLScreen(int width, int height) // Initialize The GL Window
{
if (height==0) // Prevent A Divide By Zero error
{
height=1; // Make the Height Equal One
}
glViewport(0,0,width,height); // Make our viewport the whole window
// We could make the view smaller inside
// Our window if we wanted too.
// The glViewport takes (x, y, width, height)
// This basically means, what our our drawing boundries
glMatrixMode(GL_PROJECTION); // Select The Projection Matrix
glLoadIdentity(); // Reset The Projection Matrix
// Calculate The Aspect Ratio Of The Window
// The parameters are:
// (view angle, aspect ration of the width to the height,
// The closest distance to the camera before it clips,
// FOV // Ratio // The farthest distance before it stops drawing)
gluPerspective(45.0f,(GLfloat)width/(GLfloat)height, .5f ,150.0f);
glMatrixMode(GL_MODELVIEW); // Select The Modelview Matrix
glLoadIdentity(); // Reset The Modelview Matrix
}
/*
InitializeGL
initializes OpenGL
*/
void InitializeGL(int width, int height)
{
glEnable(GL_DEPTH_TEST); // Enables Depth Testing
SizeOpenGLScreen(width, height); // resize the OpenGL Viewport to the given height and width
}
/*
main
create the window and call the initialization functions
*/
int main(int argc, char*argv[])
{
// print user instructions
cout << " Hit the F1 key to Toggle between Fullscreen and windowed mode" << endl;
cout << " Hit ESC to quit" << endl;
if( SDL_Init( SDL_INIT_VIDEO ) < 0 ) // try to initialize SDL video module
{
cerr << "Failed initializing SDL Video : " << SDL_GetError() << endl; // report error if it fails
return 1; // we use this instead of Quit because SDL isn't yet initialized
}
// Set up the format for the pixels of the OpenGL drawing surface
SetupPixelFormat();
// Create our window, we pass caption for the window, the width, height and video flags required
CreateMyWindow("www.GameTutorials.com - Camera Strafing", SCREEN_WIDTH, SCREEN_HEIGHT, VideoFlags);
// Initializes our OpenGL drawing surface
Init();
//sync the frame rate with the screen refresh
long VBL = 1;
CGLSetParameter(CGLGetCurrentContext(), kCGLCPSwapInterval, &VBL);
// Run our main loop
MainLoop();
// quit main returning success
return 0;
}
Possibly Related Threads...
| Thread: | Author | Replies: | Views: | Last Post | |
| Slowing Frame Rates and Display Lists | Nick | 4 | 2,692 |
Mar 27, 2005 06:08 AM Last Post: wadesworld |
|
| fast billboards | reubert | 2 | 2,419 |
Oct 7, 2004 04:41 AM Last Post: OneSadCookie |
|
| GL_LINE_SMOOTH looks ugly | Vertizor | 9 | 4,872 |
Sep 21, 2004 11:30 PM Last Post: arekkusu |
|
| Too fast! | Silden | 7 | 3,454 |
Apr 16, 2003 02:40 PM Last Post: Mars_999 |
|
| how fast should this be? | <seb> | 3 | 3,329 |
Feb 25, 2003 12:51 PM Last Post: <seb> |
|