glutesselator 总是在 gluTessEndPolygon() 处崩溃
glutesselator always crashes at gluTessEndPolygon()
>我使用glu tessellation来细分复杂的多边形。下面列出了简化的代码。
它总是在gluTessEndPolygon(GLUtessobj)
时崩溃并显示错误:
错误:0xC0000005:访问违规读取位置0x57783b39;
当多边形的点数较少 (<100( 时,该代码有效。
我只是想不通为什么。
typedef boost::geometry::model::point<float, 2, boost::geometry::cs::cartesian> pt;
typedef boost::geometry::model::polygon<pt> Polygon;
typedef boost::geometry::model::ring<pt> Ring;
vector<Polygon> g_myPolys;
// ------Static variables used in glu tessellation------
static GLUtesselator *GLUtessobj;
static unsigned int s_gltri_type;
static int s_tess_orient;
static int s_cur_pt_idx;
// Create an array to hold pointers to allocated vertices created by "combine" callback,
// so that they may be deleted after tessellation.
static std::vector<GLdouble*> s_combineVertexArray;
// Store tessellated results
static std::vector<double> s_vecTriVerts; // Store area objects' tessellated triangle( triangle fan, triangle strip and triangles) vertices.
static std::vector<int> s_vecTriStripVertCnts; // Store every triangle strips' start indices in m_vecTriVerts.
static std::vector<int> s_vecTriStripFirstIdx; // Store every triangle strips' vertex count start from its start index.
static std::vector<int> s_vecTriFanVertCnts; // Store every triangle fans' start indices in m_vecTriVerts.
static std::vector<int> s_vecTriFanFirstIdx; // Store every triangle fans' vertex count start from its start index.
static std::vector<int> s_vecTrisVertCnts; // Store every triangles' start indices in m_vecTriVerts.
static std::vector<int> s_vecTrisFirstIdx; // Store every triangles' vertex count start from its start index.
static int s_cur_tri_fans_vert_cnt;
static int s_cur_tri_strips_vert_cnt;
static int s_cur_tris_vert_cnt;
static std::vector<double*> s_vecTmp;
void beginCallback(GLenum which)
{
s_gltri_type = which;
switch ( s_gltri_type)
{
case GL_TRIANGLE_FAN:
s_vecTriFanFirstIdx.push_back(s_cur_pt_idx);
s_cur_tri_fans_vert_cnt = 0;
break;
case GL_TRIANGLE_STRIP:
s_vecTriStripFirstIdx.push_back(s_cur_pt_idx);
s_cur_tri_strips_vert_cnt = 0;
break;
case GL_TRIANGLES:
s_vecTrisFirstIdx.push_back(s_cur_pt_idx);
s_cur_tris_vert_cnt = 0;
break;
}
}
void vertexCallback(GLvoid *vertex)
{
GLdouble *pv = (GLdouble *) vertex;
s_vecTriVerts.push_back(pv[0]);
s_vecTriVerts.push_back(pv[1]);
s_cur_pt_idx ++;
switch ( s_gltri_type)
{
case GL_TRIANGLE_FAN:
s_cur_tri_fans_vert_cnt ++;
break;
case GL_TRIANGLE_STRIP:
s_cur_tri_strips_vert_cnt ++;
break;
case GL_TRIANGLES:
s_cur_tris_vert_cnt ++;
break;
}
}
void combineCallback(GLdouble coords[3],
GLdouble *vertex_data[4],
GLfloat weight[4], GLdouble **dataOut )
{
GLdouble *vertex = (GLdouble *)malloc(6 * sizeof(GLdouble));
vertex[0] = coords[0];
vertex[1] = coords[1];
vertex[2] = coords[2];
vertex[3] = vertex[4] = vertex[5] = 0.0;
*dataOut = vertex;
s_combineVertexArray.push_back(vertex);
}
void endCallback()
{
switch ( s_gltri_type)
{
case GL_TRIANGLE_FAN:
s_vecTriFanVertCnts.push_back(s_cur_tri_fans_vert_cnt);
break;
case GL_TRIANGLE_STRIP:
s_vecTriStripVertCnts.push_back(s_cur_tri_strips_vert_cnt);
break;
case GL_TRIANGLES:
s_vecTrisVertCnts.push_back(s_cur_tris_vert_cnt);
break;
}
}
void errorCallback(GLenum errorCode)
{
const GLubyte *estring;
estring = gluErrorString(errorCode);
printf ("Tessellation Error: %sn", estring);
}
void Tessellate()
{
// Create tessellate object
GLUtessobj = gluNewTess();
// Register the callbacks
gluTessCallback(GLUtessobj, GLU_TESS_BEGIN, (void (__stdcall*)())&beginCallback);
gluTessCallback(GLUtessobj, GLU_TESS_VERTEX, (void (__stdcall*)())&vertexCallback);
gluTessCallback(GLUtessobj, GLU_TESS_END, (void (__stdcall*)())&endCallback);
gluTessCallback(GLUtessobj, GLU_TESS_COMBINE, (void (__stdcall*)())&combineCallback);
gluTessCallback(GLUtessobj, GLU_TESS_ERROR, (void (__stdcall*)())&errorCallback);
gluTessProperty(GLUtessobj, GLU_TESS_WINDING_RULE, GLU_TESS_WINDING_POSITIVE );
gluTessBeginPolygon(GLUtessobj, NULL);
gluTessBeginContour(GLUtessobj);
Polygon pp = g_myPolys[0];
for ( int i = 0; i < pp.outer().size(); i ++)
{
GLdouble *p = new GLdouble[3];
s_vecTmp.push_back(p);
p[0] = pp.outer()[i].get<0>();
p[1] = pp.outer()[i].get<1>();
p[2] = 0.0;
gluTessVertex( GLUtessobj, p, p ) ;
}
gluTessEndContour(GLUtessobj);
gluTessEndPolygon(GLUtessobj);
gluDeleteTess(GLUtessobj);
for ( int i = 0; i < s_vecTmp.size(); i ++)
delete[] s_vecTmp[i];
s_vecTmp.clear();
// Free up any "Combine" vertices created
for(unsigned int i = 0; i < s_combineVertexArray.size(); i++)
free (s_combineVertexArray[i]);
s_combineVertexArray.clear();
}
有一件事立即让我感到奇怪,那就是你在那里__stdcall
演员表。
gluTessCallback(GLUtessobj, GLU_TESS_BEGIN, (void (__stdcall*)())&beginCallback);
你为什么要这样做?如果您的编译器抱怨不兼容的调用约定,那么您应该做的最后一件事就是强制转换调用约定。只有绝望和恐惧在等待着你,如果你投下了一个召唤公约。投射指针已经是一个坏主意(C++投射从/到void*
是可以的,但仅此而已(。
然后你用指针做了一些其他奇怪的事情。例如,您将std::vector
与手动管理的内存 (new GLdouble[3]
( 混合在一起。说真的,为什么?!
我强烈建议您简化数据结构并清理指针杂耍。很可能你在代码的某处有一些越界缓冲区写入,但很难看出确切的位置。
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