From 824bde4cebd78aa04c9018171316f7533307e0ce Mon Sep 17 00:00:00 2001
From: Simon Robertshaw <simon@hardwired.org.uk>
Date: Sun, 29 Jul 2012 12:18:07 +0100
Subject: [PATCH] clear_sim now clears air and gravity maps better, fixes issue
 #31

---
 src/simulation/Air.cpp        |  9 +++++++++
 src/simulation/Air.h          |  1 +
 src/simulation/Gravity.cpp    |  9 +++++++++
 src/simulation/Gravity.h      |  2 ++
 src/simulation/Simulation.cpp | 22 ++++------------------
 5 files changed, 25 insertions(+), 18 deletions(-)

diff --git a/src/simulation/Air.cpp b/src/simulation/Air.cpp
index ff3ea6e16..6d7b5dd29 100644
--- a/src/simulation/Air.cpp
+++ b/src/simulation/Air.cpp
@@ -36,6 +36,15 @@ void Air::make_kernel(void) //used for velocity
 		for (i=-1; i<2; i++)
 			kernel[(i+1)+3*(j+1)] *= s;
 }
+
+void Air::Clear()
+{
+	std::fill(&hv[0][0], &hv[0][0]+((XRES/CELL)*(YRES/CELL)), 273.15f + 22.0f);
+	std::fill(&pv[0][0], &pv[0][0]+((XRES/CELL)*(YRES/CELL)), 0.0f);
+	std::fill(&vy[0][0], &vy[0][0]+((XRES/CELL)*(YRES/CELL)), 0.0f);
+	std::fill(&vx[0][0], &vx[0][0]+((XRES/CELL)*(YRES/CELL)), 0.0f);
+}
+
 void Air::update_airh(void)
 {
 	int x, y, i, j;
diff --git a/src/simulation/Air.h b/src/simulation/Air.h
index 2cd93b28c..0232b8635 100644
--- a/src/simulation/Air.h
+++ b/src/simulation/Air.h
@@ -28,6 +28,7 @@ public:
 	void make_kernel(void);
 	void update_airh(void);
 	void update_air(void);
+	void Clear();
 	Air();
 };
 
diff --git a/src/simulation/Gravity.cpp b/src/simulation/Gravity.cpp
index 6ef13827a..2b7810d90 100644
--- a/src/simulation/Gravity.cpp
+++ b/src/simulation/Gravity.cpp
@@ -31,6 +31,15 @@ void Gravity::bilinear_interpolation(float *src, float *dst, int sw, int sh, int
 		}
 }
 
+void Gravity::Clear()
+{
+	std::fill(gravy, gravy+((XRES/CELL)*(YRES/CELL)), 0.0f);
+	std::fill(gravx, gravx+((XRES/CELL)*(YRES/CELL)), 0.0f);
+	std::fill(gravp, gravp+((XRES/CELL)*(YRES/CELL)), 0.0f);
+	std::fill(gravmap, gravmap+((XRES/CELL)*(YRES/CELL)), 0.0f);
+	std::fill(gravmask, gravmask+((XRES/CELL)*(YRES/CELL)), 0xFFFFFFFF);
+}
+
 void Gravity::gravity_init()
 {
 	ngrav_enable = 0;
diff --git a/src/simulation/Gravity.h b/src/simulation/Gravity.h
index e706d6dbc..e78332acf 100644
--- a/src/simulation/Gravity.h
+++ b/src/simulation/Gravity.h
@@ -77,6 +77,8 @@ public:
 	void grav_mask_r(int x, int y, char checkmap[YRES/CELL][XRES/CELL], char shape[YRES/CELL][XRES/CELL], char *shapeout);
 	void mask_free(mask_el *c_mask_el);
 
+	void Clear();
+
 	void gravity_init();
 	void gravity_cleanup();
 	void gravity_update_async();
diff --git a/src/simulation/Simulation.cpp b/src/simulation/Simulation.cpp
index 41af624cc..2ac72b213 100644
--- a/src/simulation/Simulation.cpp
+++ b/src/simulation/Simulation.cpp
@@ -1793,12 +1793,6 @@ void Simulation::clear_sim(void)
 	pfree = 0;
 	parts_lastActiveIndex = 0;
 	memset(pmap, 0, sizeof(pmap));
-	if(pv)
-		memset(pv, 0, (XRES/CELL) * (YRES/CELL)*sizeof(float));
-	if(vx)
-		memset(vx, 0, (XRES/CELL) * (YRES/CELL)*sizeof(float));
-	if(vy)
-		memset(vy, 0, (XRES/CELL) * (YRES/CELL)*sizeof(float));
 	if(fvx)
 		memset(fvx, 0, sizeof(fvx));
 	if(fvy)
@@ -1818,18 +1812,10 @@ void Simulation::clear_sim(void)
 	//memset(fire_b, 0, sizeof(fire_b));
 	//if(gravmask)
 		//memset(gravmask, 0xFFFFFFFF, (XRES/CELL)*(YRES/CELL)*sizeof(unsigned));
-	if(gravy)
-		memset(gravy, 0, (XRES/CELL)*(YRES/CELL)*sizeof(float));
-	if(gravx)
-		memset(gravx, 0, (XRES/CELL)*(YRES/CELL)*sizeof(float));
-	if(gravp)
-		memset(gravp, 0, (XRES/CELL)*(YRES/CELL)*sizeof(float));
-	if(hv)
-		for(x = 0; x < XRES/CELL; x++){
-			for(y = 0; y < YRES/CELL; y++){
-				hv[y][x] = 273.15f+22.0f; //Set to room temperature
-			}
-		}
+	if(grav)
+		grav->Clear();
+	if(air)
+		air->Clear();
 }
 void Simulation::init_can_move()
 {