Powered pipe, based on jacob1's commits

PSCN to turn on, NSCN to turn off, INST to reverse.

Differences from jacob1's commit include: flood fill function that
includes 1px diagonal pipes, powered/reversed state stored in tmp
instead of flags, sparks from PSCN/NSCN/INST always take effect the
following frame, single pixel pipe directions are a number from 0 to 7
so "if(coords)" does not check whether one is set (store another
"transfers according to 1px pipe direction" bit for reverse flow).

1 files changed, 16 insertions, 1 deletions

diff --git a/src/powder.c b/src/powder.c
index b997174..188b54c 100644
--- a/src/powder.c
+++ b/src/powder.c
@@ -1027,6 +1027,7 @@ inline int create_part(int p, int x, int y, int tv)//the function for creating a
 			parts[i].life = 100;
 			break;
 		case PT_PIPE:
+		case PT_PPIP:
 			parts[i].life = 60;
 			break;
 		case PT_BCOL:
@@ -1788,6 +1789,20 @@ void update_particles_i(pixel *vid, int start, int inc)
 		    }
 		}
 	}
+
+	if (ppip_changed)
+	{
+		for (i=0; i<=parts_lastActiveIndex; i++)
+		{
+			if (parts[i].type==PT_PPIP)
+			{
+				parts[i].tmp |= (parts[i].tmp&0xE0000000)>>3;
+				parts[i].tmp &= ~0xE0000000;
+			}
+		}
+		ppip_changed = 0;
+	}
+
 	//game of life!
 	if (ISGOL==1&&++CGOL>=GSPEED)//GSPEED is frames per generation
 	{
@@ -2599,7 +2614,7 @@ killed:
 					}
 					r = pmap[fin_y][fin_x];
 					
-					if ((r & 0xFF) == PT_PIPE && !(parts[r>>8].tmp&0xFF))
+					if (((r&0xFF)==PT_PIPE || (r&0xFF) == PT_PPIP) && !(parts[r>>8].tmp&0xFF))
 					{
 						parts[r>>8].tmp =  (parts[r>>8].tmp&~0xFF) | parts[i].type;
 						parts[r>>8].temp = parts[i].temp;