LLScreenClipRect::~LLScreenClipRect()
{
if (mEnabled)
{
popClipRect();
updateScissorRegion();
}
}
LLScreenClipRect::LLScreenClipRect(const LLRect& rect, BOOL enabled)
: mScissorState(GL_SCISSOR_TEST),
mEnabled(enabled)
{
if (mEnabled)
{
pushClipRect(rect);
mScissorState.setEnabled(!sClipRectStack.empty());
updateScissorRegion();
}
}
void LLScreenClipRect::popClipRect()
{
sClipRectStack.pop();
if (!sClipRectStack.empty())
{
updateScissorRegion();
}
else
{
gGL.setScissor(mRootScissorRect);
}
}
void LLScreenClipRect::pushClipRect(const LLRect& rect)
{
LLRect combined_clip_rect = rect;
if (!sClipRectStack.empty())
{
LLRect top = sClipRectStack.top();
combined_clip_rect.intersectWith(top);
if(combined_clip_rect.isEmpty())
{
// avoid artifacts where zero area rects show up as lines
combined_clip_rect = LLRect::null;
}
}
sClipRectStack.push(combined_clip_rect);
updateScissorRegion();
}
