Opengl ES 2.0中怎么描画点线

Opengl ES 2.0中如何描画点线？
Opengl ES 2.0中如何描画点线？

在Opengl中可以使用line stipple标志来描画点线，但是在Opengl ES中，line stipple标志已经被裁减了，没有了，所以在Opengl ES 2.0中，想要描画点线，应该如何实现，有没有性能上比较好的方法？

------解决方案--------------------------------------------------------
我自己写了个点线的描画算法，给大家贴出来！！！


OnTestLineStipple是入口函数，这里指写了算法，具体画线的Opengl ES 函数被封装了，没有贴出来。


int makeLineStipplePoint( 
int iStippleDistance, 
void* pvBuffer, 
int iBufferSize, 
char* pcFlagBufferSize,
int* piPointCount, 
int size, 
int iDimension, 
void* pvPointer
)
{
short* pPoint = pvPointer;
short* pBuffer = pvBuffer;
int iBufferIndxe = 0;
float fDistance,fDistDiff,xNormalizeVector,yNormalizeVector;
float fDistanceTmp = iStippleDistance;
int x,y,xBase,yBase;
int xPre = 0xfffffff;
int yPre = xPre;
int iFlagBufferIndex = 0;
char cFlagBufferBitIndex = 0x80;
char cIsDraw = 0xff;

if( ( NULL == pvBuffer ) || ( NULL == pcFlagBufferSize ) || ( NULL == pvPointer ) )
{
return -1;
}

iBufferSize /= (size * iDimension);

xBase = x = *pPoint;
yBase = y = *(pPoint+1);

pBuffer[iBufferIndxe++] = *pPoint++;
pBuffer[iBufferIndxe++] = *pPoint++;
if(iDimension == 3)
{
pBuffer[iBufferIndxe++] = *pPoint++;
}
(*piPointCount)--;

x -= *pPoint;
y -= *(pPoint+1);

while( ( --iBufferSize ) && (*piPointCount) )
{
fDistance = sqrtf( x * x + y * y );
fDistDiff = fDistance - fDistanceTmp;
if( fDistDiff < -1.0f )
{
//插入已有点的分支
xBase = x = *pPoint;
yBase = y = *(pPoint+1);

pBuffer[iBufferIndxe++] = *pPoint++;
pBuffer[iBufferIndxe++] = *pPoint++;
if(iDimension == 3)
{
pBuffer[iBufferIndxe++] = *pPoint++;
}
(*piPointCount)--;

memcpy( &pBuffer[iBufferIndxe], &pBuffer[iBufferIndxe-iDimension], (size * iDimension) );
iBufferIndxe += iDimension;
--iBufferSize;

x -= *pPoint;
y -= *(pPoint+1);

pcFlagBufferSize[iFlagBufferIndex] = cFlagBufferBitIndex & cIsDraw;

fDistanceTmp -= fDistance;
}
else if( fDistDiff > 1.0f )
{
//插入新点的分支
int iXFlag = ( x >= 0 ) ? -1 : 1;
int iYFlag = ( y >= 0 ) ? -1 : 1;
if( xPre != x )
{
xPre = x;
xNormalizeVector = abs((float)x) / fDistance * iXFlag;
xNormalizeVector *= fDistanceTmp;
}
if( yPre != y )
{
yPre = y;
yNormalizeVector = abs((float)y) / fDistance * iYFlag;
yNormalizeVector *= fDistanceTmp;
}

xBase += AROUND(xNormalizeVector);
yBase += AROUND(yNormalizeVector);

pBuffer[iBufferIndxe++] = xBase;
pBuffer[iBufferIndxe++] = yBase;
if(iDimension == 3)
{
pBuffer[iBufferIndxe++] = pBuffer[iBufferIndxe-3];
}

pcFlagBufferSize[iFlagBufferIndex] = cFlagBufferBitIndex & cIsDraw;
cIsDraw = ~cIsDraw;

x = xBase - *pPoint;
y = yBase - *(pPoint+1);
fDistanceTmp = iStippleDistance;
}
else //( fDistance == fDistanceTmp )
{
xBase = x = *pPoint;
yBase = y = *(pPoint+1);

pBuffer[iBufferIndxe++] = *pPoint++;
pBuffer[iBufferIndxe++] = *pPoint++;
if(iDimension == 3)
{
pBuffer[iBufferIndxe++] = *pPoint++;
}
(*piPointCount)--;

x -= *pPoint;
y -= *(pPoint+1);

pcFlagBufferSize[iFlagBufferIndex] = cFlagBufferBitIndex & cIsDraw;
cIsDraw = ~cIsDraw;

fDistanceTmp = iStippleDistance;
}
}

if( (*piPointCount) < iBufferSize )