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Full Discussion: Looping an array of 2d arrays in C
Top Forums Programming Looping an array of 2d arrays in C Post 303023421 by Azrael on Sunday 16th of September 2018 03:16:47 PM
Old 09-16-2018
Looping an array of 2d arrays in C
Le sigh... Hopefully this will be the last time I have to ask for help on this topic. For a while now I've been working with a 1d array that holds 2d arrays. For reference you can view here. Now I'm just trying to loop through the elements with the following:

Code:
#include <stdio.h>

void arrbyptr(int (*ptr[2][2])[2]) {

int result;

    for ( int i = 0; i < 2; ++i ){
        for ( int j = 0; j < 2; ++j ){
            for ( int k = 0; k < 2; ++k ){
                result = (*ptr[i][j])[k];
                printf("%d\n", result);
            }
        }
    }
}

int main(void)
{
        int arr2d[2][2]={ {1,2},{3,4} };
        int arr2db[2][2]={ {5,6},{7,8} };

        int (*ptr[2][2])[2]= { { arr2d, arr2db } };

        arrbyptr(ptr);
}

It runs momentarily before segfaulting:

Code:
$ ./test
1
2
5
6
Segmentation fault

I get no errors or warnings from gcc. And yes, I understand logical errors will not show up. Tried to run this through strace, but can't find where its failing or why.

Any advice much appreciated.
Last edited by Azrael; 09-16-2018 at 06:03 PM..
 

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LEARN ABOUT OSX

glgeneratemipmap

GLGENERATEMIPMAP(3G)						    OpenGL 3.3						      GLGENERATEMIPMAP(3G)

NAME

       glGenerateMipmap - generate mipmaps for a specified texture target

C SPECIFICATION

       void glGenerateMipmap(GLenum target);

PARAMETERS

       target
	   Specifies the target to which the texture whose mimaps to generate is bound.  target must be GL_TEXTURE_1D, GL_TEXTURE_2D,
	   GL_TEXTURE_3D, GL_TEXTURE_1D_ARRAY, GL_TEXTURE_2D_ARRAY or GL_TEXTURE_CUBE_MAP.

DESCRIPTION

       glGenerateMipmap generates mipmaps for the texture attached to target of the active texture unit. For cube map textures, a
       GL_INVALID_OPERATION error is generated if the texture attached to target is not cube complete.

       Mipmap generation replaces texel array levels level base + 1 through q with arrays derived from the level base array, regardless of their
       previous contents. All other mimap arrays, including the level base array, are left unchanged by this computation.

       The internal formats of the derived mipmap arrays all match those of the level base array. The contents of the derived arrays are computed
       by repeated, filtered reduction of the level base array. For one- and two-dimensional texture arrays, each layer is filtered independently.

ERRORS

       GL_INVALID_ENUM is generated if target is not one of the accepted texture targets.

       GL_INVALID_OPERATION is generated if target is GL_TEXTURE_CUBE_MAP and the texture bound to the GL_TEXTURE_CUBE_MAP target of the active
       texture unit is not cube complete.

SEE ALSO

       glTexImage2D(), glBindTexture(), glGenTextures()

COPYRIGHT

       Copyright (C) 2010 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication
       License, v 1.0, 8 June 1999.  http://opencontent.org/openpub/.

OpenGL 3.3							    03/08/2011						      GLGENERATEMIPMAP(3G)
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