FGFS-4.1/OpenSceneGraph
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Added support for mapping GL_QUADS, GL_QUAD_STRIP and GL_POLYGONS to GL_TRIANGLE equivalents.

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This commit is contained in:
Robert Osfield
2009-11-10 11:36:07 +00:00
parent def04324a4
commit d0b021568e
2 changed files with 34 additions and 1 deletions
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32
src/osg/GLBeginEndAdapter.cpp
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@@ -280,5 +280,35 @@ void GLBeginEndAdapter::End()
_state->applyDisablingOfVertexAttributes();
glDrawArrays(_primitiveMode, 0, _vertices->size());
if (_primitiveMode==GL_QUADS)
{
unsigned int numQuads = _vertices->size()/4;
unsigned int numIndices = numQuads * 6;
if (numIndices > _indexArray.size())
{
// we need to expand the _indexArray to be big enough to cope with all the quads required.
unsigned int numExistingQuads = _indexArray.size()/6;
_indexArray.reserve(numIndices);
for(unsigned int i=numExistingQuads; i<numQuads; ++i)
{
unsigned int base = i*4;
_indexArray.push_back(base);
_indexArray.push_back(base+2);
_indexArray.push_back(base+1);
_indexArray.push_back(base);
_indexArray.push_back(base+3);
_indexArray.push_back(base+2);
}
}
glDrawElements(GL_TRIANGLES, numQuads*6, GL_UNSIGNED_SHORT, &(_indexArray.front()));
}
else if (_primitiveMode==GL_QUAD_STRIP)
{
// will the winding be wrong? Do we need to swap it?
glDrawArrays(GL_TRIANGLE_STRIP, 0, _vertices->size());
}
else if (_primitiveMode==GL_POLYGON) glDrawArrays(GL_TRIANGLE_FAN, 0, _vertices->size());
else glDrawArrays(_primitiveMode, 0, _vertices->size());
}