From d5fe05d76079fda752fa3f6be26abdcd828d1f26 Mon Sep 17 00:00:00 2001
From: Cate <cate@Catelite.(none)>
Date: Wed, 9 Feb 2011 23:17:57 +0800
Subject: [PATCH] "Added Air modes using Gravitymode code"

---
 includes/powder.h |  1 +
 src/air.c         | 26 ++++++++++++++++++++++++++
 src/main.c        | 30 +++++++++++++++++++++++++++++-
 src/powder.c      |  2 ++
 4 files changed, 58 insertions(+), 1 deletion(-)

diff --git a/includes/powder.h b/includes/powder.h
index 1b2824ecc..5e1639372 100644
--- a/includes/powder.h
+++ b/includes/powder.h
@@ -778,6 +778,7 @@ extern float player[27];
 extern float player2[27];
 
 extern int gravityMode;
+extern int airMode;
 
 extern particle *parts;
 extern particle *cb_parts;
diff --git a/src/air.c b/src/air.c
index e9a8b9e93..aaf42d265 100644
--- a/src/air.c
+++ b/src/air.c
@@ -33,6 +33,9 @@ void update_air(void)
 {
 	int x, y, i, j;
 	float dp, dx, dy, f, tx, ty;
+
+if (airMode != 4) {
+
 	for (i=0; i<YRES/CELL; i++)
 	{
 		pv[i][0] = pv[i][0]*0.8f;
@@ -177,6 +180,28 @@ void update_air(void)
 			if (dy > 256.0f) dy = 256.0f;
 			if (dy < -256.0f) dy = -256.0f;
 
+
+			switch (airMode)
+			{
+			default:
+			case 0:  //Default
+			break;
+			case 1:  //0 Pressure
+			dp = 0.0f;
+			break;
+			case 2:  //0 Velocity
+			dx = 0.0f;
+			dy = 0.0f;
+			break;
+			case 3: //0 Air
+			dx = 0.0f;
+			dy = 0.0f;
+			dp = 0.0f;
+			break;
+			case 4: //No Update
+			break;
+			}
+
 			ovx[y][x] = dx;
 			ovy[y][x] = dy;
 			opv[y][x] = dp;
@@ -185,3 +210,4 @@ void update_air(void)
 	memcpy(vy, ovy, sizeof(vy));
 	memcpy(pv, opv, sizeof(pv));
 }
+}
diff --git a/src/main.c b/src/main.c
index 03bffa96d..3a2ae3fd0 100644
--- a/src/main.c
+++ b/src/main.c
@@ -543,7 +543,7 @@ int parse_save(void *save, int size, int replace, int x0, int y0)
 	if (replace)
 	{
 		gravityMode = 1;
-
+		airMode = 1;
 		memset(bmap, 0, sizeof(bmap));
 		memset(emap, 0, sizeof(emap));
 		memset(signs, 0, sizeof(signs));
@@ -1697,6 +1697,33 @@ int main(int argc, char *argv[])
 			}
 		}
 
+			if (sdl_key=='y')
+	                {
+                        ++airMode;
+                        itc = 52;
+                        switch (airMode)
+                        {
+                        default:
+                                airMode = 0;
+                        case 0:
+                                strcpy(itc_msg, "Air: On");
+                                break;
+                        case 1:
+                                strcpy(itc_msg, "Air: Pressure Off");
+                                break;
+                        case 2:
+                                strcpy(itc_msg, "Air: Velocity Off");
+                                break;
+                        case 3:
+                                strcpy(itc_msg, "Air: Off");                           
+                                break;
+                        case 4:
+                                strcpy(itc_msg, "Air: No Update");                             
+                                break;
+                        }
+                }
+
+
 		if (sdl_key=='t')
 			VINE_MODE = !VINE_MODE;
 		if (sdl_key==SDLK_SPACE)
@@ -2246,6 +2273,7 @@ int main(int argc, char *argv[])
 						svf_tags[0] = 0;
 						svf_description[0] = 0;
 						gravityMode = 1;
+						airMode = 0;
 						death = death2 = 0;
 						isplayer2 = 0;
 						isplayer = 0;
diff --git a/src/powder.c b/src/powder.c
index 5a60d0d65..74f450799 100644
--- a/src/powder.c
+++ b/src/powder.c
@@ -13,6 +13,8 @@ particle *parts;
 particle *cb_parts;
 
 int gravityMode = 1; // starts enabled in "vertical" mode...
+int airMode = 0; 
+
 
 unsigned char bmap[YRES/CELL][XRES/CELL];
 unsigned char emap[YRES/CELL][XRES/CELL];