I'm Having an issue with loading an image with devIL for openGL
in an earlier part of my project i call
ilInit();
in a function right after i call my load just like this
//generate a texture
ilGenImages( 1, &uiTextureHandle );
//bind our image
ilBindImage( uiTextureHandle );
//load
//ilLoad( IL_PNG, (const ILstring)"fake.png" );
ilLoad( IL_PNG, "fake.png" );
for the sake of error tracking i did place "ilGetError()" after every call
which returned 0 for all of these except for ilLoad which returns 1285
after some searching i figured out that this is a lack of memory error.
so ilLoad always returns 0 and not loaded.
anyone know what im doing incorrect as for my loading or if i forgot to do something
because i feel i might have forgotten something and thats the reason why 1285 appears.
A common reason for ilLoad() to fail with IL_OUT_OF_MEMORY is simply if the PNG file you're using is corrupt.
However, 1285 means IL_INVALID_VALUE - it means the path you're giving it is likely wrong. Try an absolute path (remembering that back slashes aren't okay in C++ unless you use double slashes).
I personally have used DevIL for quite some time and did like it. However, I urge you to consider FreeImage. It has a bit more development going on and is quite stable - I used it in a commercial engine for all my image needs, and it integrates decently well with DirectX/OpenGL much like DevIL.
Related
I've been having an issue with a certain function call in the
dphaseWeighted = af::convolve(dphaseWeighted, m_slowTimeFilter);
which seem to produce nothing but nan's.
The back ground is we have recently switched from using AF OpenCL to AF Cuda and the problem that we are seeing happens in the function.
dphaseWeighted = af::convolve(dphaseWeighted, m_slowTimeFilter);
This seems to work well when using OpenCL.
Unfortunatley, I can't give you the whole function because of IP. only a couple of snippets.
This convolve lies deep with in a phase extract piece of code. and is actualy the second part of that code which uses the af::convolve funtion.
The first function seems to behave as expected, with sensible floating point data out.
but then when it comes to the second function all I'm seeing is nan's coming out ( I view that with af_print amd dumping the data to a file.
in the CMakeList I include
include_directories(${ArrayFire_INCLUDE_DIRS})
and
target_link_libraries(DASPhaseInternalLib ${ArrayFire_CUDA_LIBRARIES})
and it builds as expected.
Has anyone experience any think like this before?
My application has two Pictures embedded in the Frame. My code is as follows:
wxMemoryInputStream istream1(Bild_png, sizeof Bild_png);
wxImage Bild_png(istream1, wxBITMAP_TYPE_PNG);
new wxStaticBitmap(p_img, wxID_ANY, wxBitmap(Bild_png));
vbox->Add(p_img ,0);
(vbox is the Sizer)
When I start the App, I've a "T-" at the left-upper corner in both Bitmaps. When I change the notebookitem("screen") and get back to the first Screen (where the Bitmaps are) the "-T" has disappeared...
How can I fixed it, so that I will never see the failure?
i had to call Layout() at the upmost sizer. That has solved my problem. It means at the end:
vbox->Layout()
#catalin, I don't think that to post aorund 2000 lines of sourcecode is a better way. I had choose this little snipped, because it says all what needed. A expert with wxWidgets had give me - with this four lines - the hint that something is fault with the sizer, not with the pic.
Haven't you been advised before to search the samples? For example widgets; just grep for wxStaticBitmap and I'm sure you'll find something useful.
This is just a poor way of asking a question.
In your c++ snippet you're using Bild_png even before it was declared - really? Then you mention both Bitmaps and notebookitem("screen") which are just unknown items to anyone else but you.
IMO it is just too... wrong to receive a good answer...
This is driving me up the wall..
I've got a very simple SDL2 program.
It has a array of 3 SDL_Texture pointers.
These textures are filled as follows:
SDL_Texture *myarray[15];
SDL_Surface *surface;
for(int i=0;i<3;i++)
{
char filename[] = "X.bmp";
filename[0] = i + '0';
surface = SDL_LoadBMP(filename);
myarray[i] = SDL_CreateTextureFromSurface(myrenderer,surface);
SDL_FreeSurface(surface);
}
This works, no errors.
In the main loop (which is just a standard event loop waiting for SDL_QUIT, keystrokes and a user-event which a SDL_Timer puts in the event queue every second) I just do (for the timer triggered event):
idx = (idx+1) % 3; // idx is global var initially 0.
SDL_RenderClear(myrenderer);
SDL_RenderCopy(myrenderer, myarray[idx], NULL, NULL);
SDL_RendererPresent(myrenderer);
This works fine for 0.bmp and 1.bmp, but the 3rd image (2.bmp) simply shows as a black field.
This is structural.
If I alternate the first 2 images they are both fine.
If I alternate the 2nd and 3rd image the 3rd image doesn't show.
If I use more than 3 images then 3 and upwards show as black.
Loading order doesn't matter. It starts going wrong with the 3rd image loaded from disk.
All images are properly formatted BMP's.
I even saved 2.bmp back to disk under a different name by using SDL_SaveBMP() after it was loaded to make sure it got loaded in memory OK. The new file is bit for bit identical to the original.
This program, without modifications and the same bmp files, works fine on OSX (XCode5) and Windows (VC++ 2012 Express).
The problem only shows on the Raspberry PI.
I have placed explicit error checks on every call that can leave a result/error-code (not shown in the samples above for brevity) but all of them show "no error".
I have used the latest stable source set of www.libsdl.org and compiled as instructed (configure, make, make install, etc.).
Anybody got any idea what could be going on ?
P.S.
Keyboard input doesn't seem to work either on my PI, but I haven't delved into that yet.
Answering myself as I finally figured it out myself...
I finally went back to the README-raspberrypi.txt that came with the SDL2 sources.
I didn't read it carefully enough the first time around...
Problem 1: I'am running on a FULL-HD display. The PI's default GPU memory is 64MB which is not enough for large displays and double-buffering. As suggested in the README I increased this to 128MB and this solved the black image problem.
Problem 2: Text input wasn't working because my user-account was not in the input group. I had added the default "pi" account to the input group initially, but when I later started using another account I forgot to add that user to the group.
In short: Caught by my own (too) quick skimming of the documentation.
I've been following this tutorial on OpenGL and C++:
http://nehe.gamedev.net/data/lessons/lesson.asp?lesson=06
...and I've found myself facing quite the error. Whenever I try to compile, my program crashes with an error of the type, System.AccessViolationException. I've isolated the problem to be in this function:
glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage[0]->sizeX, TextureImage[0]->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[0]->data);
In case you don't want to look through that tutorial, the memory appears to be set up like so:
AUX_RGBImageRec *TextureImage[1];
memset(TextureImage,0,sizeof(void *)*1);
Any help would be awesome. Thanks.
You're crashing because TextureImage[0] is NULL. The initial memset there sets it to NULL; if you follow along in the tutorial, the next line of code is this:
if (TextureImage[0]=LoadBMP("Data/NeHe.bmp"))
Note carefully that there is a single = sign here, not a double == as you'd normally see (you may even get a compiler warning here; to suppress that, add extra parentheses around the assignment)). Make sure you copied this line of code correctly and that you have a single = here.
If in fact you do have a single =, then check to make sure that LoadBMP is returning a non-NULL value. If it's returning NULL, the most likely cause is that it can't find the bitmap file Data/NeHe.bmp, either because it doesn't exist or it's looking for it in the wrong directory. Make sure your current working directory is set up correctly so that it can find the image.
Turns out the bitmap I was trying to load was too large. I shrunk it to 256x256px and it worked perfectly.
I'm kind of wondering about this, if you create a texture in memory in DirectX with the CreateTexture function:
HRESULT CreateTexture(
UINT Width,
UINT Height,
UINT Levels,
DWORD Usage,
D3DFORMAT Format,
D3DPOOL Pool,
IDirect3DTexture9** ppTexture,
HANDLE* pSharedHandle
);
...and pass in D3DFMT_UNKNOWN format what is supposed to happen exactly? If I try to get the surface of the first or second level will it cause an error? Can it fail? Will the graphics device just choose a random format of its choosing? Could this cause problems between different graphics card models/brands?
I just tried it out and it does not fail, mostly
When Usage is set to D3DUSAGE_RENDERTARGET or D3DUSAGE_DYNAMIC, it consistently came out as D3DFMT_A8R8G8B8, no matter what I did to the back buffer format or other settings. I don't know if that has to do with my graphics card or not. My guess is that specifying unknown means, "pick for me", and that the 32-bit format is easiest for my card.
When the usage was D3DUSAGE_DEPTHSTENCIL, it failed consistently.
So my best conclusion is that specifying D3DFMT_UNKNOWN as the format gives DirectX the choice of what it should be. Or perhaps it always just defaults to D3DFMT_A8R8G8B.
Sadly, I can't confirm any of this in any documentation anywhere. :|
MSDN doesn't say. But I'm pretty sure you'd get "D3DERR_INVALIDCALL" as a result.
If the method succeeds, the return
value is D3D_OK. If the method fails,
the return value can be one of the
following: D3DERR_INVALIDCALL,
D3DERR_OUTOFVIDEOMEMORY,
E_OUTOFMEMORY.
I think this falls into the "undefined" category. Some drivers will fail the allocations, while others may default to something. I've never seen anything in the WDK that says that this condition needs to be handled. I'm guessing if you enable the debug DX runtime you will see an error message.