From 7a2d6482e3971d669427697a8cd9fe0b1563bb83 Mon Sep 17 00:00:00 2001
From: Campbell Barton <ideasman42@gmail.com>
Date: Thu, 28 Apr 2011 05:34:11 +0000
Subject: [PATCH] skip some calculations with the wave modifier - when the vert
 has no vgroup weight or 0.0 falloff.

---
 source/blender/modifiers/intern/MOD_wave.c | 94 +++++++++++-----------
 1 file changed, 46 insertions(+), 48 deletions(-)

diff --git a/source/blender/modifiers/intern/MOD_wave.c b/source/blender/modifiers/intern/MOD_wave.c
index df3a7f80490..6dfe5314131 100644
--- a/source/blender/modifiers/intern/MOD_wave.c
+++ b/source/blender/modifiers/intern/MOD_wave.c
@@ -263,6 +263,9 @@ static void waveModifier_do(WaveModifierData *md,
 			(float)(1.0 / exp(wmd->width * wmd->narrow * wmd->width * wmd->narrow));
 	float lifefac = wmd->height;
 	float (*tex_co)[3] = NULL;
+	const int wmd_axis= wmd->flag & (MOD_WAVE_X|MOD_WAVE_Y);
+	const float falloff= wmd->falloff;
+	float falloff_fac= 1.0f; /* when falloff == 0.0f this stays at 1.0f */
 
 	if(wmd->flag & MOD_WAVE_NORM && ob->type == OB_MESH)
 		mvert = dm->getVertArray(dm);
@@ -306,7 +309,7 @@ static void waveModifier_do(WaveModifierData *md,
 
 	if(lifefac != 0.0f) {
 		/* avoid divide by zero checks within the loop */
-		float falloff_inv= wmd->falloff ? 1.0f / wmd->falloff : 1.0f;
+		float falloff_inv= falloff ? 1.0f / falloff : 1.0f;
 		int i;
 
 		for(i = 0; i < numVerts; i++) {
@@ -314,52 +317,29 @@ static void waveModifier_do(WaveModifierData *md,
 			float x = co[0] - wmd->startx;
 			float y = co[1] - wmd->starty;
 			float amplit= 0.0f;
-			float dist = 0.0f;
-			float falloff_fac = 0.0f;
-			TexResult texres;
-			MDeformWeight *def_weight = NULL;
+			float def_weight= 1.0f;
 
 			/* get weights */
 			if(dvert) {
-				int j;
-				for(j = 0; j < dvert[i].totweight; ++j) {
-					if(dvert[i].dw[j].def_nr == defgrp_index) {
-						def_weight = &dvert[i].dw[j];
-						break;
-					}
-				}
+				def_weight= defvert_find_weight(&dvert[i], defgrp_index);
 
 				/* if this vert isn't in the vgroup, don't deform it */
-				if(!def_weight) continue;
-			}
-
-			if(wmd->texture) {
-				texres.nor = NULL;
-				get_texture_value(wmd->texture, tex_co[i], &texres);
-			}
-
-			/*get dist*/
-			if(wmd->flag & MOD_WAVE_X) {
-				if(wmd->flag & MOD_WAVE_Y){
-					dist = (float)sqrt(x*x + y*y);
-				}
-				else{
-					dist = fabs(x);
+				if(def_weight == 0.0f) {
+					continue;
 				}
 			}
-			else if(wmd->flag & MOD_WAVE_Y) {
-				dist = fabs(y);
-			}
 
-			falloff_fac = (1.0f - (dist * falloff_inv));
-			CLAMP(falloff_fac, 0.0f, 1.0f);
-
-			if(wmd->flag & MOD_WAVE_X) {
-				if(wmd->flag & MOD_WAVE_Y) amplit = (float)sqrt(x*x + y*y);
-				else amplit = x;
+			switch(wmd_axis) {
+			case MOD_WAVE_X|MOD_WAVE_Y:
+				amplit = sqrtf(x*x + y*y);
+				break;
+			case MOD_WAVE_X:
+				amplit = x;
+				break;
+			case MOD_WAVE_Y:
+				amplit = y;
+				break;
 			}
-			else if(wmd->flag & MOD_WAVE_Y)
-				amplit= y;
 
 			/* this way it makes nice circles */
 			amplit -= (ctime - wmd->timeoffs) * wmd->speed;
@@ -369,22 +349,40 @@ static void waveModifier_do(WaveModifierData *md,
 						+ wmd->width;
 			}
 
+			if(falloff != 0.0f) {
+				float dist = 0.0f;
+
+				switch(wmd_axis) {
+				case MOD_WAVE_X|MOD_WAVE_Y:
+					dist = sqrtf(x*x + y*y);
+					break;
+				case MOD_WAVE_X:
+					dist = fabsf(x);
+					break;
+				case MOD_WAVE_Y:
+					dist = fabsf(y);
+					break;
+				}
+
+				falloff_fac = (1.0f - (dist * falloff_inv));
+				CLAMP(falloff_fac, 0.0f, 1.0f);
+			}
+
 			/* GAUSSIAN */
-			if(amplit > -wmd->width && amplit < wmd->width) {
+			if((falloff_fac != 0.0f) && (amplit > -wmd->width) && (amplit < wmd->width)) {
 				amplit = amplit * wmd->narrow;
 				amplit = (float)(1.0f / expf(amplit * amplit) - minfac);
 
 				/*apply texture*/
-				if(wmd->texture)
-					amplit = amplit * texres.tin;
+				if(wmd->texture) {
+					TexResult texres;
+					texres.nor = NULL;
+					get_texture_value(wmd->texture, tex_co[i], &texres);
+					amplit *= texres.tin;
+				}
 
-				/*apply weight*/
-				if(def_weight)
-					amplit = amplit * def_weight->weight;
-
-				/*apply falloff*/
-				if (wmd->falloff > 0)
-					amplit = amplit * falloff_fac;
+				/*apply weight & falloff */
+				amplit *= def_weight * falloff_fac;
 
 				if(mvert) {
 					/* move along normals */