目前，我正在尝试实现计算着色器。为此，我使用的是一个模板，它使用Qt来处理OpenGL的东西。要创建计算着色器，可以使用此函数，该函数适用于其他一些计算着色器：
std::shared_ptr<QOpenGLShaderProgram> createComputeShaderProgram(const QString &computeShaderPath)
{
auto shaderProgram = std::make_shared<QOpenGLShaderProgram>();
bool result;
//! Load and compile the compute shader
if (!computeShaderPath.isEmpty()) {
result = shaderProgram->addShaderFromSourceFile(QOpenGLShader::Compute, computeShaderPath);
if (!result) {
qWarning() << computeShaderPath;
qWarning() << shaderProgram->log();
}
}
//! ...and finally link it to resolve any references.
result = shaderProgram->link();
if (!result)
qWarning() << "Could not link shader program:" << shaderProgram->log();
return shaderProgram;
}
正如我所说，这适用于所有其他计算着色器。调用行
时会出现问题result = shaderProgram->link();
我没有在着色器中更改导致错误的重要内容。我刚刚添加了一个基本的naiv邻居搜索。要弄清楚，当错误发生时，我试着注释掉一些行，看看它是否正在编译。从那里，我得到了错误发生的信息，因为以下着色器函数中标有//relevant line的两行：
#define NUM_NEIGHBORS 4
float distNN[NUM_NEIGHBORS];
int idxNN[NUM_NEIGHBORS];
void neighborSearch()
{
vec3 currentPosition = /* ... calc the current position with the compute shader invocation ID */;
vec3 currentPoint = vec3(0.0);
float curDist = 0.0;
currentPoint = pointCloud[0].vertex.xyz;
curDist = distance(currentPosition, currentPoint);
float maxDist = curDist;
int idxMaxDist = 0;
for(int i = 1; i < NUM_NEIGHBORS; i++)
{
currentPoint = pointCloud[i].vertex.xyz;
curDist = distance(currentPosition, currentPoint);
if(curDist >= maxDist)
{
maxDist = curDist; //relevant line
idxMaxDist = i; //relevant line
}
}
for(int i = 0; i < NUM_NEIGHBORS; i++)
{
distNN[i] = maxDist;
idxNN[i] = idxMaxDist;
}
for(int i = 0; i < nmbPoints; i++)
{
currentPoint = pointCloud[i].vertex.xyz;
curDist = distance(currentPoint,currentPosition);
if(curDist < distNN[NUM_NEIGHBORS-1])
{
bool inserted = false;
int j = NUM_NEIGHBORS - 2;
while(!inserted)
{
if(curDist < distNN[j] && j >= 0)
{
j--;
}
else
{
for(int k = NUM_NEIGHBORS-1; k > j+1; k--)
{
distNN[k] = distNN[k-1];
idxNN[k] = idxNN[k-1];
}
distNN[j+1] = curDist;
idxNN[j+1] = i;
inserted = true;
}
}
}//curDist < NUM_NEIGHBORS-1
}//iterate over all neighbors
}//neighborSearch()
我希望我没有删除对此至关重要的内容，同时简化了这个着色器。我用地址消毒剂编译它，它的输出是：
==5365== ERROR: AddressSanitizer: SEGV on unknown address 0x00000000002c (pc 0x7fde1d61b630 sp 0x7fffb34c61b8 bp 0x7fffb34c77a0 T0)
AddressSanitizer can not provide additional info.
#0 0x7fde1d61b62f (/usr/lib64/libnvidia-glcore.so.331.49+0xb5062f)
#1 0x7fde1d4eacc5 (/usr/lib64/libnvidia-glcore.so.331.49+0xa1fcc5)
#2 0x7fde1d4eb25e (/usr/lib64/libnvidia-glcore.so.331.49+0xa2025e)
#3 0x7fde1d4eb34f (/usr/lib64/libnvidia-glcore.so.331.49+0xa2034f)
#4 0x7fde1d4f051f (/usr/lib64/libnvidia-glcore.so.331.49+0xa2551f)
#5 0x7fde1d4f1b43 (/usr/lib64/libnvidia-glcore.so.331.49+0xa26b43)
#6 0x7fde1d4f04f7 (/usr/lib64/libnvidia-glcore.so.331.49+0xa254f7)
#7 0x7fde1d4f0d83 (/usr/lib64/libnvidia-glcore.so.331.49+0xa25d83)
#8 0x7fde1d4f10f6 (/usr/lib64/libnvidia-glcore.so.331.49+0xa260f6)
#9 0x7fde1d4cce43 (/usr/lib64/libnvidia-glcore.so.331.49+0xa01e43)
#10 0x7fde1d4d2bd4 (/usr/lib64/libnvidia-glcore.so.331.49+0xa07bd4)
#11 0x7fde1d4d325a (/usr/lib64/libnvidia-glcore.so.331.49+0xa0825a)
#12 0x7fde1dc616ad (/usr/lib64/libnvidia-glcore.so.331.49+0x11966ad)
#13 0x7fde1dc6741b (/usr/lib64/libnvidia-glcore.so.331.49+0x119c41b)
#14 0x7fde1dc44a7a (/usr/lib64/libnvidia-glcore.so.331.49+0x1179a7a)
#15 0x7fde22c7eca0 (/QT_DIRECTORY/5.2.1/gcc_64/lib/libQt5Gui.so.5.2.1+0x34dca0)
#16-24 some project relevant stuff
==5365== ABORTING
有谁知道为什么会出现这个问题以及如何解决这个问题？我真的不知道现在该做什么。
系统信息：
optirun qtcreator Valgrind输出：
$ optirun valgrind --leak-check=yes ./projectname
==4038== Memcheck, a memory error detector
==4038== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==4038== Using Valgrind-3.10.1 and LibVEX; rerun with -h for copyright info
==4038== Command: ./projectname
==4038==
==4038== Shadow memory range interleaves with an existing memory mapping. ASan cannot proceed correctly. ABORTING.
==4038== Process memory map follows:
0x000000400000-0x00000055f000 PROJECT_DIRECTORY/projectname
0x00000075e000-0x000000766000 PROJECT_DIRECTORY/projectname
0x000000766000-0x00000076d000 PROJECT_DIRECTORY/projectname
0x00000076d000-0x00000076e000
0x000004000000-0x000004020000 /lib64/ld-2.18.so
0x000004020000-0x00000402d000
0x000004035000-0x00000403d000
0x000004052000-0x000004062000
0x00000421f000-0x000004220000 /lib64/ld-2.18.so
0x000004220000-0x000004221000 /lib64/ld-2.18.so
0x000004221000-0x000004222000
0x000004222000-0x000004223000
0x000004a22000-0x000004a23000 /usr/local/lib64/valgrind/vgpreload_core-amd64-linux.so
0x000004a23000-0x000004c22000 /usr/local/lib64/valgrind/vgpreload_core-amd64-linux.so
0x000004c22000-0x000004c23000 /usr/local/lib64/valgrind/vgpreload_core-amd64-linux.so
0x000004c23000-0x000004c24000 /usr/local/lib64/valgrind/vgpreload_core-amd64-linux.so
0x000004c24000-0x000004c32000 /usr/local/lib64/valgrind/vgpreload_memcheck-amd64-linux.so
0x000004c32000-0x000004e32000 /usr/local/lib64/valgrind/vgpreload_memcheck-amd64-linux.so
0x000004e32000-0x000004e33000 /usr/local/lib64/valgrind/vgpreload_memcheck-amd64-linux.so
0x000004e33000-0x000004e34000 /usr/local/lib64/valgrind/vgpreload_memcheck-amd64-linux.so
0x000004e34000-0x000004e35000 /usr/lib64/libdlfaker.so
0x000004e35000-0x000005035000 /usr/lib64/libdlfaker.so
0x000005035000-0x000005036000 /usr/lib64/libdlfaker.so
0x000005036000-0x000005037000 /usr/lib64/libdlfaker.so
0x000005037000-0x000005104000 /usr/lib64/librrfaker.so
0x000005104000-0x000005304000 /usr/lib64/librrfaker.so
0x000005304000-0x000005307000 /usr/lib64/librrfaker.so
0x000005307000-0x000005309000 /usr/lib64/librrfaker.so
0x000005309000-0x00000534c000
0x00000534c000-0x000005375000 /usr/lib64/libasan.so.0.0.0
0x000005375000-0x000005574000 /usr/lib64/libasan.so.0.0.0
0x000005574000-0x000005575000 /usr/lib64/libasan.so.0.0.0
0x000005575000-0x000005576000 /usr/lib64/libasan.so.0.0.0
0x000005576000-0x0000082db000
0x0000082db000-0x000008358000 /usr/lib64/libGLU.so.1.3.1
0x000008358000-0x000008557000 /usr/lib64/libGLU.so.1.3.1
0x000008557000-0x000008559000 /usr/lib64/libGLU.so.1.3.1
0x000008559000-0x00000855a000 /usr/lib64/libGLU.so.1.3.1
0x00000855a000-0x0000085bb000 QT_DIRECTORY/gcc_64/lib/libQt5OpenGL.so.5.2.1
0x0000085bb000-0x0000087ba000 QT_DIRECTORY/gcc_64/lib/libQt5OpenGL.so.5.2.1
0x0000087ba000-0x0000087bc000 QT_DIRECTORY/gcc_64/lib/libQt5OpenGL.so.5.2.1
0x0000087bc000-0x0000087be000 QT_DIRECTORY/gcc_64/lib/libQt5OpenGL.so.5.2.1
0x0000087be000-0x000008db9000 QT_DIRECTORY/gcc_64/lib/libQt5Widgets.so.5.2.1
0x000008db9000-0x000008fb9000 QT_DIRECTORY/gcc_64/lib/libQt5Widgets.so.5.2.1
0x000008fb9000-0x000008fe3000 QT_DIRECTORY/gcc_64/lib/libQt5Widgets.so.5.2.1
0x000008fe3000-0x000009004000 QT_DIRECTORY/gcc_64/lib/libQt5Widgets.so.5.2.1
0x000009004000-0x000009464000 QT_DIRECTORY/gcc_64/lib/libQt5Gui.so.5.2.1
0x000009464000-0x000009663000 QT_DIRECTORY/gcc_64/lib/libQt5Gui.so.5.2.1
0x000009663000-0x000009677000 QT_DIRECTORY/gcc_64/lib/libQt5Gui.so.5.2.1
0x000009677000-0x000009689000 QT_DIRECTORY/gcc_64/lib/libQt5Gui.so.5.2.1
0x000009689000-0x00000968a000
0x00000968a000-0x000009b33000 QT_DIRECTORY/gcc_64/lib/libQt5Core.so.5.2.1
0x000009b33000-0x000009d33000 QT_DIRECTORY/gcc_64/lib/libQt5Core.so.5.2.1
0x000009d33000-0x000009d3d000 QT_DIRECTORY/gcc_64/lib/libQt5Core.so.5.2.1
0x000009d3d000-0x000009d56000 QT_DIRECTORY/gcc_64/lib/libQt5Core.so.5.2.1
0x000009d56000-0x000009d58000
0x000009d58000-0x000009e35000 /usr/lib64/nvidia/libGL.so.331.49
0x000009e35000-0x00000a034000 /usr/lib64/nvidia/libGL.so.331.49
0x00000a034000-0x00000a074000 /usr/lib64/nvidia/libGL.so.331.49
0x00000a074000-0x00000a08b000
0x00000a08b000-0x00000a0a3000 /lib64/libpthread-2.18.so
0x00000a0a3000-0x00000a2a3000 /lib64/libpthread-2.18.so
0x00000a2a3000-0x00000a2a4000 /lib64/libpthread-2.18.so
0x00000a2a4000-0x00000a2a5000 /lib64/libpthread-2.18.so
0x00000a2a5000-0x00000a2a9000
0x00000a2a9000-0x00000a393000 /usr/lib64/libstdc++.so.6.0.18
0x00000a393000-0x00000a592000 /usr/lib64/libstdc++.so.6.0.18
0x00000a592000-0x00000a59a000 /usr/lib64/libstdc++.so.6.0.18
0x00000a59a000-0x00000a59c000 /usr/lib64/libstdc++.so.6.0.18
0x00000a59c000-0x00000a5b1000
0x00000a5b1000-0x00000a6b3000 /lib64/libm-2.18.so
0x00000a6b3000-0x00000a8b2000 /lib64/libm-2.18.so
0x00000a8b2000-0x00000a8b3000 /lib64/libm-2.18.so
0x00000a8b3000-0x00000a8b4000 /lib64/libm-2.18.so
0x00000a8b4000-0x00000a8c2000 /usr/lib64/libgomp.so.1.0.0
0x00000a8c2000-0x00000aac1000 /usr/lib64/libgomp.so.1.0.0
0x00000aac1000-0x00000aac2000 /usr/lib64/libgomp.so.1.0.0
0x00000aac2000-0x00000aac3000 /usr/lib64/libgomp.so.1.0.0
0x00000aac3000-0x00000aad9000 /lib64/libgcc_s.so.1
0x00000aad9000-0x00000acd8000 /lib64/libgcc_s.so.1
0x00000acd8000-0x00000acd9000 /lib64/libgcc_s.so.1
0x00000acd9000-0x00000acda000 /lib64/libgcc_s.so.1
0x00000acda000-0x00000ae7e000 /lib64/libc-2.18.so
0x00000ae7e000-0x00000b07e000 /lib64/libc-2.18.so
0x00000b07e000-0x00000b082000 /lib64/libc-2.18.so
0x00000b082000-0x00000b084000 /lib64/libc-2.18.so
0x00000b084000-0x00000b088000
0x00000b088000-0x00000b08b000 /lib64/libdl-2.18.so
0x00000b08b000-0x00000b28a000 /lib64/libdl-2.18.so
0x00000b28a000-0x00000b28b000 /lib64/libdl-2.18.so
0x00000b28b000-0x00000b28c000 /lib64/libdl-2.18.so
0x00000b28c000-0x00000b290000 /usr/lib64/libXv.so.1.0.0
0x00000b290000-0x00000b48f000 /usr/lib64/libXv.so.1.0.0
0x00000b48f000-0x00000b490000 /usr/lib64/libXv.so.1.0.0
0x00000b490000-0x00000b491000 /usr/lib64/libXv.so.1.0.0
0x00000b491000-0x00000b5c9000 /usr/lib64/libX11.so.6.3.0
0x00000b5c9000-0x00000b7c9000 /usr/lib64/libX11.so.6.3.0
0x00000b7c9000-0x00000b7ca000 /usr/lib64/libX11.so.6.3.0
0x00000b7ca000-0x00000b7cf000 /usr/lib64/libX11.so.6.3.0
0x00000b7cf000-0x00000b7e0000 /usr/lib64/libXext.so.6.4.0
0x00000b7e0000-0x00000b9df000 /usr/lib64/libXext.so.6.4.0
0x00000b9df000-0x00000b9e0000 /usr/lib64/libXext.so.6.4.0
0x00000b9e0000-0x00000b9e1000 /usr/lib64/libXext.so.6.4.0
0x00000b9e1000-0x00000ba30000 /usr/lib64/libgobject-2.0.so.0.3800.2
0x00000ba30000-0x00000bc30000 /usr/lib64/libgobject-2.0.so.0.3800.2
0x00000bc30000-0x00000bc31000 /usr/lib64/libgobject-2.0.so.0.3800.2
0x00000bc31000-0x00000bc32000 /usr/lib64/libgobject-2.0.so.0.3800.2
0x00000bc32000-0x00000bd33000 /usr/lib64/libglib-2.0.so.0.3800.2
0x00000bd33000-0x00000bf32000 /usr/lib64/libglib-2.0.so.0.3800.2
0x00000bf32000-0x00000bf33000 /usr/lib64/libglib-2.0.so.0.3800.2
0x00000bf33000-0x00000bf34000 /usr/lib64/libglib-2.0.so.0.3800.2
0x00000bf34000-0x00000bf35000
0x00000bf35000-0x00000c13e000 QT_DIRECTORY/gcc_64/lib/libicui18n.so.51.1
0x00000c13e000-0x00000c33e000 QT_DIRECTORY/gcc_64/lib/libicui18n.so.51.1
0x00000c33e000-0x00000c34b000 QT_DIRECTORY/gcc_64/lib/libicui18n.so.51.1
0x00000c34b000-0x00000c34d000 QT_DIRECTORY/gcc_64/lib/libicui18n.so.51.1
0x00000c34d000-0x00000c34e000
0x00000c34e000-0x00000c4be000 QT_DIRECTORY/gcc_64/lib/libicuuc.so.51.1
0x00000c4be000-0x00000c6bd000 QT_DIRECTORY/gcc_64/lib/libicuuc.so.51.1
0x00000c6bd000-0x00000c6ce000 QT_DIRECTORY/gcc_64/lib/libicuuc.so.51.1
0x00000c6ce000-0x00000c6cf000 QT_DIRECTORY/gcc_64/lib/libicuuc.so.51.1
0x00000c6cf000-0x00000c6d4000
0x00000c6d4000-0x00000c6d5000 /usr/lib64/libgthread-2.0.so.0.3800.2
0x00000c6d5000-0x00000c8d4000 /usr/lib64/libgthread-2.0.so.0.3800.2
0x00000c8d4000-0x00000c8d5000 /usr/lib64/libgthread-2.0.so.0.3800.2
0x00000c8d5000-0x00000c8d6000 /usr/lib64/libgthread-2.0.so.0.3800.2
0x00000c8d6000-0x00000c8dd000 /lib64/librt-2.18.so
0x00000c8dd000-0x00000cadc000 /lib64/librt-2.18.so
0x00000cadc000-0x00000cadd000 /lib64/librt-2.18.so
0x00000cadd000-0x00000cade000 /lib64/librt-2.18.so
0x00000cade000-0x00000cae1000 /usr/lib64/libnvidia-tls.so.331.49
0x00000cae1000-0x00000cce0000 /usr/lib64/libnvidia-tls.so.331.49
0x00000cce0000-0x00000cce1000 /usr/lib64/libnvidia-tls.so.331.49
0x00000cce1000-0x00000e849000 /usr/lib64/libnvidia-glcore.so.331.49
0x00000e849000-0x00000ea48000 /usr/lib64/libnvidia-glcore.so.331.49
0x00000ea48000-0x00000f4d3000 /usr/lib64/libnvidia-glcore.so.331.49
0x00000f4d3000-0x00000f4f0000
0x00000f4f0000-0x00000f50e000 /usr/lib64/libxcb.so.1.1.0
0x00000f50e000-0x00000f70d000 /usr/lib64/libxcb.so.1.1.0
0x00000f70d000-0x00000f70e000 /usr/lib64/libxcb.so.1.1.0
0x00000f70e000-0x00000f70f000 /usr/lib64/libxcb.so.1.1.0
0x00000f70f000-0x00000f716000 /usr/lib64/libffi.so.4.0.1
0x00000f716000-0x00000f915000 /usr/lib64/libffi.so.4.0.1
0x00000f915000-0x00000f916000 /usr/lib64/libffi.so.4.0.1
0x00000f916000-0x00000f917000 /usr/lib64/libffi.so.4.0.1
0x00000f917000-0x00000f982000 /usr/lib64/libpcre.so.1.2.5
0x00000f982000-0x00000fb82000 /usr/lib64/libpcre.so.1.2.5
0x00000fb82000-0x00000fb83000 /usr/lib64/libpcre.so.1.2.5
0x00000fb83000-0x00000fb84000 /usr/lib64/libpcre.so.1.2.5
0x00000fb84000-0x0000110cc000 QT_DIRECTORY/gcc_64/lib/libicudata.so.51.1
0x0000110cc000-0x0000112cc000 QT_DIRECTORYgcc_64/lib/libicudata.so.51.1
0x0000112cc000-0x0000112cd000 QT_DIRECTORY/gcc_64/lib/libicudata.so.51.1
0x0000112cd000-0x0000112d0000 /usr/lib64/libXau.so.6.0.0
0x0000112d0000-0x0000114cf000 /usr/lib64/libXau.so.6.0.0
0x0000114cf000-0x0000114d0000 /usr/lib64/libXau.so.6.0.0
0x0000114d0000-0x0000114d1000 /usr/lib64/libXau.so.6.0.0
0x000038000000-0x0000383d6000 /usr/local/lib64/valgrind/memcheck-amd64-linux
0x0000385d5000-0x0000385d9000 /usr/local/lib64/valgrind/memcheck-amd64-linux
0x0000385d9000-0x00003a048000
0x000802001000-0x000802b9c000
0x000802b9c000-0x000802b9e000
0x000802b9e000-0x000802c9e000 [stack:4038]
0x000802c9e000-0x000802ca0000
0x000802ca0000-0x000802ca1000 /tmp/vgdb-pipe-shared-mem-vgdb-4038-by-USERNAME-on-linux-92w9.site
0x000802ca1000-0x000802cbd000
0x000802cbd000-0x000803359000
0x00080339b000-0x000803a94000
0x000803b6c000-0x000806434000
0x000ffeffe000-0x000fff001000
0x7ffd84e0f000-0x7ffd84e31000
0xffffffffff600000-0xffffffffff601000 [vsyscall]
==4038== End of process memory map.
==4038==
==4038== HEAP SUMMARY:
==4038== in use at exit: 0 bytes in 0 blocks
==4038== total heap usage: 0 allocs, 0 frees, 0 bytes allocated
==4038==
==4038== All heap blocks were freed -- no leaks are possible
==4038==
==4038== For counts of detected and suppressed errors, rerun with: -v
==4038== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
optirun valgrind -v ./projectname的输出在线here
glslangValidator输出：
Warning, version 430 is not yet complete; most version-specific features are present, but some are missing.
快速修复：
在相关行解决错误之前添加行i = i+1-1;。