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问题描述
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);
实际上，当我尝试在
Actually what i am doing is generating triangles here when i try to print
triNum[surfnum]之后打印
size_t buf_size = 9*sizeof(GLfloat)*triNum[surfnum];
时，我在这里生成三角形，它给出7 1，但是当我尝试在
it gives 7 1 but when I try to print same after
for(i=0; i<triNum[surfnum]; ++i) 之后打印相同的打印机时，它说
it says
7...7...7...7...7...7...7...Aborted，还检测到Glibc.所以我在做什么错.
我用valgrind输出是
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)
但我无法确定这是否可以告诉我.
but I was unable to figure out from this may be you can tell me.
推荐答案
sudhanshu2511写道:
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));
}
{
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));
}
是外部是for循环?
are outside the for loop?
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