Topics

1

General discussions / Possible bug in ... something?

« on: August 19, 2011, 11:01:20 pm »

Upon closing a program, SFML causes an access violation in certain situations with sf::Texture. I'm using 64-bit Windows 7 and Visual Studio 2010. In VS, at program close, I get

"First-chance exception at 0x773532d0 in Test.exe: 0xC0000005: Access violation reading location 0x000008bcd188e2f8."
The thread 'Win64 Thread' (0x48c) has exited with code 0 (0x0).
The program '[4896] Test.exe: Native' has exited with code 0 (0x0).

The following code is a pretty good demonstration:

Code: [Select]


#define SFML_DYNAMIC
#include <SFML/Graphics.hpp>

#define ACCESS_VIOLATION

int main()
{
#ifdef ACCESS_VIOLATION
    sf::RenderWindow App(sf::VideoMode(800, 600, 32), "Title");
#endif

    sf::Texture Texture1;
    if (!Texture1.LoadFromFile("sprite1.png"))
        return EXIT_FAILURE;

sf::Texture Texture2;
    if (!Texture2.LoadFromFile("sprite2.png"))
        return EXIT_FAILURE;

#ifdef ACCESS_VIOLATION
App.Close();
#endif
    return EXIT_SUCCESS;
}


The following code has the same behavior, which is confusing:

Code: [Select]


#define SFML_DYNAMIC
#include <SFML/Graphics.hpp>

#define ACCESS_VIOLATION

int main()
{
    sf::RenderWindow App(sf::VideoMode(800, 600, 32), "Title");

    sf::Texture Texture1;
    if (!Texture1.LoadFromFile("sprite1.png"))
        return EXIT_FAILURE;

sf::Texture Texture2;
#ifdef ACCESS_VIOLATION
    if (!Texture2.LoadFromFile("sprite2.png"))
        return EXIT_FAILURE;
#endif

App.Close();
    return EXIT_SUCCESS;
}


Commenting out the #define ACCESS_VIOLATION results in no error.

2

General / deleting sf::Texture* - I must be doing it really wrong

« on: August 19, 2011, 04:06:57 am »

I suspect I'm doing something very wrong here, but I'm not very experienced with STL.

Essentially, I load all of my images as sf::Texture objects on the heap, and store the pointers in a map.

Code: [Select]


//snippets:
//I use one of these
std::map<std::string, sf::Texture*> images;

//the load image function is like this:
sf::Texture *temp = new sf::Texture;
if( temp->LoadFromFile(fileName) == false )
return false;
images[imageKey] = temp;

//then at the end I iterate through the map and use delete on each pointer in the map


This creates some sort of heap corruption though, which makes me think I'm either making a huge memory leak somewhere or I'm deleting textures twice. What's going on here? Is it the map and using delete on the pointers, or am I screwing up the heap somewhere else and this is just where the heap is used again and the program notices?

3

General / Compiling SFML2 on 64-bit

« on: December 31, 2010, 04:01:42 am »

So I got a new laptop a few days ago (64-bit Windows 7), and I tried to install SFML2. I have Visual Studio 2010 Professional, and I have the 64-bit compiler already installed.

Using CMake, I tried both the Visual Studio 10 compiler and Visual Studio 10 64-bit, and while the standard compiler works fine, some of the examples didn't work. e.g. the shaders example immediately closes after I start it. So then I tried the 64-bit, and SFML doesn't even compile. I get a 130 linker errors for SFML graphics and audio. Example:


Error   83   error LNK2019: unresolved external symbol jpeg_set_defaults referenced in function "private: bool __cdecl sf::priv::ImageLoader::WriteJpg(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class std::vector<unsigned char,class std::allocator<unsigned char> > const &,unsigned int,unsigned int)" (?WriteJpg@ImageLoader@priv@sf@@AEAA_NAEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator
@D@2@@std@@AEBV?$vector@EV?$allocator@E@std@@@5@II@Z)   C:\Users\Zack\sfml2\build\src\SFML\Graphics\ImageLoader.obj   sfml-graphics


I suspect it has to do with the external libraries that sfml-graphics and sfml-audio use, but I'm at a loss at what to do. And why don't the 32-bit compiled SFML samples work right?

4

Audio / LoadFromSamples Function

« on: March 10, 2009, 11:48:43 pm »

I cannot get LoadFromSamples to work.

I get samples in the form of a  const sf::Int16 *. Since I can't change a const pointer directly, I copy all of the data to a buffer. I modify it, and then I try to load the buffer back to the sf::SoundBuffer.

Code: [Select]

const sf::Int16 * pSample = Buffer.GetSamples();

int max = Buffer.GetSamplesCount()-1;
int channels = Buffer.GetChannelsCount();
int sampleRate = Buffer.GetSampleRate();

sf::Int16 * myBuffer = new sf::Int16[max];

for( int i = 0; i < max; i++ )
{
myBuffer[i] = pSample[i];
}

//Modify myBuffer

Buffer.LoadFromSamples( myBuffer, max, channels, sampleRate );

I get the following error:
error C2662: 'sf::SoundBuffer::LoadFromSamples' : cannot convert 'this' pointer from 'const sf::SoundBuffer' to 'sf::SoundBuffer &'        Conversion loses qualifiers

I declare Buffer as:

Code: [Select]

const sf::SoundBuffer& Buffer = Recorder.GetBuffer();

Maybe I'm doing something wrong with references?

5

General / Access Violation at Program Close

« on: December 27, 2008, 09:34:47 pm »

I've spent the entire morning trying to get this working, but I still haven't gotten it to stop crashing.

Whenever I close the app, it breaks. In fact, it breaks right after the program hits "return 0;" It gives the following error message in VC++ Express:

First-chance exception at 0x0262cbab in demo.exe: 0xC0000005: Access violation reading location 0xfeeefef6.
Unhandled exception at 0x0262cbab in demo.exe: 0xC0000005: Access violation reading location 0xfeeefef6.

and a runtime error when launched through windows explorer:

Pure virtual function call.

In fact, the following code, which simply loads two images and shows them for 5 seconds, crashes at the end.

 

Code: [Select]


#define SFML_DYNAMIC

#include <SFML/Graphics.hpp>

int main()
{
sf::Clock timer;
sf::RenderWindow App(sf::VideoMode(200, 200, 32), "Demo App");

App.SetBackgroundColor( sf::Color( 255, 255, 255 ) );

sf::Image Image1, Image2;
if (!Image1.LoadFromFile("pic1.png"))
return 1;
if (!Image2.LoadFromFile("pic2.png"))
return 1;

sf::Sprite Sprite1(Image1);
sf::Sprite Sprite2(Image2);

sf::Sleep( 1.0 );

//Not drawing the sprites fixes the problem, but I don't want a blank game.
while( App.IsOpened() )
{
App.Draw(Sprite1);
App.Draw(Sprite2);
App.Display();

if( timer.GetElapsedTime() > 5.0 )
App.Close();
}

//Crashes right here.
return 0;
}


If I don't call App.Close(), the errors don't happen, but I'm pretty sure that App.Close() does some cleanup work that I shouldn't not do. I must be doing something wrong, in my code. It only happens when I use more than one image and sprite. Help!

6

Graphics / Antialiasing error for shapes

« on: December 26, 2008, 03:53:29 pm »

I'd like to smooth my shape edges, but setting up the window like this:

 

Code: [Select]

sf::RenderWindow App(sf::VideoMode(800, 600, 32), "My App", Style::Close|Style::Resize, WindowSettings(32, 8, 2 ) );

Gives the error:

Failed to find a pixel format supporting antialiasing ; antialiasing will be disabled

Any other way I can do this without using a software renderer to antialias lines manually?