Discussion :

[shadow07]

Bonsoir;

j'ai developpé une application en visual c++ 2008 qui permet de dessiner une scène 3D à partir d'un fichier obj, je veux texturer les objets de la scène,
pour cela j'ai fait appel à la bibliothèque jpeglib pour charger l'image de texture.

j'ai trouvé des erreurs de link incompréhensible dans cette fonction:

Code :

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gl_texture_t *
ReadJPEGFrom(const file_buffer_t *file)
{
  gl_texture_t *texinfo = NULL;
  struct jpeg_decompress_struct cinfo;
  struct my_error_mgr jerr;
  struct jpeg_source_mgr jsrc;
  JSAMPROW j;
  int i;
 
   //create and configure decompress object 
  jpeg_create_decompress (&cinfo);
  cinfo.err = jpeg_std_error (&jerr.pub);
  cinfo.src = &jsrc;
 
  //configure error manager 
  jerr.pub.error_exit = err_exit;
 
  if (setjmp (jerr.setjmp_buffer))
    {
      jpeg_destroy_decompress (&cinfo);
 
      if (texinfo)
	{
	  if (texinfo->texels)
	    free (texinfo->texels);
 
	  free (texinfo);
	}
 
      return NULL;
    }
 
   //configure source manager 
  jsrc.next_input_byte = file->data;
  jsrc.bytes_in_buffer = file->length;
  jsrc.init_source = mem_init_source;
  jsrc.fill_input_buffer = mem_fill_input_buffer;
  jsrc.skip_input_data = mem_skip_input_data;
  jsrc.resync_to_restart = jpeg_resync_to_restart;
  jsrc.term_source = mem_term_source;
 
  //read file's header and prepare for decompression 
  jpeg_read_header (&cinfo, TRUE);
  jpeg_start_decompress (&cinfo);
 
  texinfo = (gl_texture_t *)malloc (sizeof (gl_texture_t));
  texinfo->width = cinfo.image_width;
  texinfo->height = cinfo.image_height;
  texinfo->internalFormat = cinfo.num_components;
  texinfo->format = (cinfo.num_components == 1) ? GL_LUMINANCE : GL_RGB;
 
  texinfo->texels = (GLubyte *)malloc (sizeof (GLubyte) * texinfo->width
			       * texinfo->height * texinfo->internalFormat);
 
 
  for (i = 0; i < texinfo->height; ++i)
    {
#if 1
      j = (texinfo->texels + ((texinfo->height -
	(i + 1)) * texinfo->width * texinfo->internalFormat));
#else
      j = &texinfo->texels[texinfo->width * i * texinfo->internalFormat];
#endif
 
      jpeg_read_scanlines (&cinfo, &j, 1);
    }
 
 
  jpeg_finish_decompress (&cinfo);
  jpeg_destroy_decompress (&cinfo);
 
  return texinfo;
}

les erreurs sont:

Code :

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1>texture.obj : error LNK2019: unresolved external symbol _jpeg_finish_decompress referenced in function "struct gl_texture_t * __cdecl ReadJPEGFrom(struct file_buffer_t const *)" (?ReadJPEGFrom@@YAPAUgl_texture_t@@PBUfile_buffer_t@@@Z)
1>texture.obj : error LNK2019: unresolved external symbol _jpeg_read_scanlines referenced in function "struct gl_texture_t * __cdecl ReadJPEGFrom(struct file_buffer_t const *)" (?ReadJPEGFrom@@YAPAUgl_texture_t@@PBUfile_buffer_t@@@Z)
1>texture.obj : error LNK2019: unresolved external symbol _jpeg_start_decompress referenced in function "struct gl_texture_t * __cdecl ReadJPEGFrom(struct file_buffer_t const *)" (?ReadJPEGFrom@@YAPAUgl_texture_t@@PBUfile_buffer_t@@@Z)
1>texture.obj : error LNK2019: unresolved external symbol _jpeg_read_header referenced in function "struct gl_texture_t * __cdecl ReadJPEGFrom(struct file_buffer_t const *)" (?ReadJPEGFrom@@YAPAUgl_texture_t@@PBUfile_buffer_t@@@Z)
1>texture.obj : error LNK2019: unresolved external symbol _jpeg_resync_to_restart referenced in function "struct gl_texture_t * __cdecl ReadJPEGFrom(struct file_buffer_t const *)" (?ReadJPEGFrom@@YAPAUgl_texture_t@@PBUfile_buffer_t@@@Z)
1>texture.obj : error LNK2019: unresolved external symbol _jpeg_destroy_decompress referenced in function "struct gl_texture_t * __cdecl ReadJPEGFrom(struct file_buffer_t const *)" (?ReadJPEGFrom@@YAPAUgl_texture_t@@PBUfile_buffer_t@@@Z)
1>texture.obj : error LNK2019: unresolved external symbol _jpeg_std_error referenced in function "struct gl_texture_t * __cdecl ReadJPEGFrom(struct file_buffer_t const *)" (?ReadJPEGFrom@@YAPAUgl_texture_t@@PBUfile_buffer_t@@@Z)
1>texture.obj : error LNK2019: unresolved external symbol _jpeg_CreateDecompress referenced in function "struct gl_texture_t * __cdecl ReadJPEGFrom(struct file_buffer_t const *)" (?ReadJPEGFrom@@YAPAUgl_texture_t@@PBUfile_buffer_t@@@Z)

comment corrigé ces erreurs svp?

merci d'avance.