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333         glGenBuffers(surftotal, uiVBO);
334         {
335                 for(surfnum=0; surfnum<surftotal; ++surfnum)
336                 {
337                         glBindBuffer(GL_ARRAY_BUFFER, uiVBO[surfnum]);
338                         size_t buf_size = 9*sizeof(GLfloat)*triNum[surfnum];
339                         GLfloat* const pData = (GLfloat*)malloc(buf_size);
340                         for(i=0; i<triNum[surfnum]; ++i){
341                                 memcpy(pData+i*9,   triArray[surfnum][i].pt1, 3*sizeof(GLfloat));
342                                 memcpy(pData+i*9+3, triArray[surfnum][i].pt2, 3*sizeof(GLfloat));
343                                 memcpy(pData+i*9+6, triArray[surfnum][i].pt3, 3*sizeof(GLfloat));
344                                 }
345                                 glBufferData(GL_ARRAY_BUFFER, buf_size, pData, GL_STATIC_DRAW);
346                                 free(pData);
347                 }
348                 glBindBuffer(GL_ARRAY_BUFFER, 0);
349                 glEnableVertexAttribArray(VERTEX_ARRAY);
350                 for(surfnum=0; surfnum<surftotal; ++surfnum)
351                 {
352                         glBindBuffer(GL_ARRAY_BUFFER, uiVBO[surfnum]);
353                         glVertexAttribPointer(VERTEX_ARRAY, 3, GL_FLOAT, GL_FALSE, 0, 0);
354                         glDrawArrays(GL_TRIANGLES, 0, 3*triNum[surfnum]);
355                         if (!TestEGLError("glDrawArrays"))
356                         {
357                         goto cleanup;
358                         }
359                 }
360                 glBindBuffer(GL_ARRAY_BUFFER, 0);
361                 eglSwapBuffers(eglDisplay, eglSurface);
362 
363                 if (!TestEGLError("eglSwapBuffers"))
364                 {
365                         goto cleanup;
366                 }
367 
368                 int i32NumMessages = XPending( x11Display );
369                 for( int i = 0; i < i32NumMessages; i++ )
370                 {
371                         XEvent  event;
372                         XNextEvent( x11Display, &event );
373                 }
374         }
375         glDeleteBuffers(surftotal,uiVBO);
Actually what i am doing is generating triangles here when i try to print
triNum[surfnum]
after
size_t buf_size = 9*sizeof(GLfloat)*triNum[surfnum];
it gives 7 1 but when I try to print same after
for(i=0; i&lt;triNum[surfnum]; ++i) 
it says
7...7...7...7...7...7...7...Aborted
and also Glibc detected . So what wrong am i doing.

I use valgrind its output was

<pre lang="msil">==8922== Memcheck, a memory error detector
==8922== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al.
==8922== Using Valgrind-3.6.0.SVN-Debian and LibVEX; rerun with -h for copyright info
==8922== Command: ./cube
==8922==
libEGL warning: use software fallback
==8922== Invalid write of size 1
==8922==    at 0x4027418: memcpy (mc_replace_strmem.c:497)
==8922==    by 0x804A48F: main (Hello.cpp:343)
==8922==  Address 0x9391567 is 11 bytes after a block of size 252 alloc'd
==8922==    at 0x4025BD3: malloc (vg_replace_malloc.c:236)
==8922==    by 0x804A3EC: main (Hello.cpp:339)
==8922==
==8922== Invalid write of size 1
==8922==    at 0x4027420: memcpy (mc_replace_strmem.c:497)
==8922==    by 0x804A48F: main (Hello.cpp:343)
==8922==  Address 0x9391566 is 10 bytes after a block of size 252 alloc'd
==8922==    at 0x4025BD3: malloc (vg_replace_malloc.c:236)
==8922==    by 0x804A3EC: main (Hello.cpp:339)
==8922==
==8922== Invalid write of size 1
==8922==    at 0x4027429: memcpy (mc_replace_strmem.c:497)
==8922==    by 0x804A48F: main (Hello.cpp:343)
==8922==  Address 0x9391565 is 9 bytes after a block of size 252 alloc'd
==8922==    at 0x4025BD3: malloc (vg_replace_malloc.c:236)
==8922==    by 0x804A3EC: main (Hello.cpp:339)
==8922==
==8922== Invalid write of size 1
==8922==    at 0x4027432: memcpy (mc_replace_strmem.c:497)
==8922==    by 0x804A48F: main (Hello.cpp:343)
==8922==  Address 0x9391564 is 8 bytes after a block of size 252 alloc'd
==8922==    at 0x4025BD3: malloc (vg_replace_malloc.c:236)
==8922==    by 0x804A3EC: main (Hello.cpp:339)
==8922==
==8922== Invalid write of size 1
==8922==    at 0x4027418: memcpy (mc_replace_strmem.c:497)
==8922==    by 0x804A4E3: main (Hello.cpp:344)
==8922==  Address 0x9391573 is not stack'd, malloc'd or (recently) free'd
==8922==
==8922== Invalid write of size 1
==8922==    at 0x4027420: memcpy (mc_replace_strmem.c:497)
==8922==    by 0x804A4E3: main (Hello.cpp:344)
==8922==  Address 0x9391572 is not stack'd, malloc'd or (recently) free'd
==8922==
==8922== Invalid write of size 1
==8922==    at 0x4027429: memcpy (mc_replace_strmem.c:497)
==8922==    by 0x804A4E3: main (Hello.cpp:344)
==8922==  Address 0x9391571 is not stack'd, malloc'd or (recently) free'd
==8922==
==8922== Invalid write of size 1
==8922==    at 0x4027432: memcpy (mc_replace_strmem.c:497)
==8922==    by 0x804A4E3: main (Hello.cpp:344)
==8922==  Address 0x9391570 is not stack'd, malloc'd or (recently) free'd
==8922==
==8922== Invalid write of size 1
==8922==    at 0x4027418: memcpy (mc_replace_strmem.c:497)
==8922==    by 0x804A539: main (Hello.cpp:345)
==8922==  Address 0x939157f is not stack'd, malloc'd or (recently) free'd
==8922==
==8922== Invalid write of size 1
==8922==    at 0x4027420: memcpy (mc_replace_strmem.c:497)
==8922==    by 0x804A539: main (Hello.cpp:345)
==8922==  Address 0x939157e is not stack'd, malloc'd or (recently) free'd
==8922==
==8922== Invalid write of size 1
==8922==    at 0x4027429: memcpy (mc_replace_strmem.c:497)
==8922==    by 0x804A539: main (Hello.cpp:345)
==8922==  Address 0x939157d is not stack'd, malloc'd or (recently) free'd
==8922==
==8922== Invalid write of size 1
==8922==    at 0x4027432: memcpy (mc_replace_strmem.c:497)
==8922==    by 0x804A539: main (Hello.cpp:345)
==8922==  Address 0x939157c is not stack'd, malloc'd or (recently) free'd
==8922==
--8922-- VALGRIND INTERNAL ERROR: Valgrind received a signal 11 (SIGSEGV) - exiting
--8922-- si_code=1;  Faulting address: 0xC8B91574;  sp: 0x62a5ce00
valgrind: the 'impossible' happened:
   Killed by fatal signal
==8922==    at 0x38031511: unlinkBlock (m_mallocfree.c:245)
sched status:
  running_tid=1
Thread 1: status = VgTs_Runnable
==8922==    at 0x4024F12: calloc (vg_replace_malloc.c:467)
==8922==    by 0x48D068A: softpipe_resource_create (sp_texture.c:114)
==8922==    by 0x4A50D96: st_bufferobj_data (u_inlines.h:180)
==8922==    by 0x4A1BB4E: _mesa_BufferDataARB (bufferobj.c:1177)
==8922==    by 0x49BFFD7: _es_BufferData (api_exec_es2.c:391)
==8922==    by 0x804A561: main (Hello.cpp:347)
but I was unable to figure out from this may be you can tell me.
Posted 7-Jul-11 19:14pm
Edited 8-Jul-11 0:13am
v8

1 solution

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Solution 1

Did you realize the following lines
sudhanshu2511 wrote:
{
memcpy(pData+i*9, triArray[surfnum][i].pt1, 3*sizeof(GLfloat));
memcpy(pData+i*9+3, triArray[surfnum][i].pt2, 3*sizeof(GLfloat));
memcpy(pData+i*9+6, triArray[surfnum][i].pt3, 3*sizeof(GLfloat));
}

are outside the for loop?
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v2

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