* Updated to ZDoom r2992:

- Add alpha property to sector_t::splane. Not used yet.
- Add an alpha parameter to R_FindPlane.
- Fixed: R_FindPlane must do a full visplane comparison for stacked sectors with a non-0 alpha for the sector plane.
- Made the alpha used by stacked sectors part of the visplane. This will be needed to fix the merging of stacks with the same displacement but different alpha values.
- Replaced all calls to sqrtf with sqrt. Also changed P_RadiusAttack to use doubles for all floating point calculations.
- Fixed: When playing non-looping songs GMESong::Read could return without releasing the critical section.

git-svn-id: http://mancubus.net/svn/hosted/gzdoom/trunk@1074 b0f79afe-0144-0410-b225-9a4edf0717df

src/am_map.cpp

@@ -1533,7 +1533,7 @@ void AM_drawGrid (const AMColor &color)
 
 	// [RH] Calculate a minimum for how long the grid lines should be so that
 	// they cover the screen at any rotation.
-	minlen = (fixed_t)sqrtf ((float)m_w*(float)m_w + (float)m_h*(float)m_h);
+	minlen = (fixed_t)sqrt ((double)m_w*(double)m_w + (double)m_h*(double)m_h);
 	extx = (minlen - m_w) / 2;
 	exty = (minlen - m_h) / 2;