Get an SIGSEGV error when add a PNGImage in TGLCompositeImage
lazarus / 39-Graphics

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azrael11 · 2014-10-08 14:05

I am usings Lazarus 1.2.4 and GLSCENE svn 6462 (1.2 svn version)

I add material with this function below

Code: [Select]function AddMaterial(aMatLib: TGlMaterialLibrary;
aFileName, aMaterialName: string):     TGlLibMaterial; overload;
  begin
    result := aMatLib.Materials.Add;
    with result do
      begin
        with Material do
          begin
            if aFileName= 'Fast_Blur' then
              begin
                MaterialOptions:= [moNoLighting];
                Texture.Disabled:= true;
                Texture.TextureMode:= tmDecal;
                BlendingMode:= bmModulate;
              end
            else
              begin
                MaterialOptions := [moIgnoreFog, moNoLighting];
                Texture.Disabled := false;
                Texture.TextureMode:= tmModulate;
                BlendingMode := bmTransparency;
              end;
         with FrontProperties do
           begin
             Ambient.SetColor(1, 1, 1, 1);
             if aFileName= 'Fast_Blur' then
              Diffuse.SetColor(204,204,204,1)
             else
              Diffuse.SetColor(1, 1, 1, 1);
             Emission.SetColor(1, 1, 1, 1);
             Specular.SetColor(1, 1, 1, 1);
           end;
     Texture.ImageClassName:= 'TGLCompositeImage';

       if aFileName<> 'Fast_Blur' then
         begin
           if ExtractFileExt(aFileName) = '.bmp' then
             TGLCompositeImage(Texture.Image).LoadFromFile(aFileName)
         else if ExtractFileExt(aFileName) = '.tga' then
            begin
             
TGLCompositeImage(Texture.Image).LoadFromFile(aFileName);
            end
         else if ExtractFileExt(aFileName) = '' then
           TGLCompositeImage(Texture.Image).LoadFromFile(aFileName +
'.png');
     end;
  end;
  Name := aMaterialName;
  end;
end;
When i run it i get the below error

Code: [Select]Project One raised exception class "External : SIGSEGV"
Try some digging find that when the pngimage try to load from stream
in line

Code: [Select]177    if _png_sig_cmp(@sig, 0, 8) <> 0 then
And before execute the raise EInvalidRasterFile.Create('Invalid PNG
file');

get the SIGSEGV..

So anybody can help ...

Ps... if i change the TGLComposite image with TGLPictureImage then
works perfect but i dont have the Transparency of the images..

Thanks...

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azrael11 · 2014-10-12 05:49

After some digging i found that something goes wrong when the
GLPNGImage runs functions from LibPng ...

Some help please...
Thank you...