faster dust calculations

1 files changed, 16 insertions, 16 deletions

diff --git a/src/render/dust.cc b/src/render/dust.cc
index 64969e3..b1d4077 100644
--- a/src/render/dust.cc
+++ b/src/render/dust.cc
@@ -65,6 +65,7 @@ void Dust::draw()
 			free(dust);
 			dust = 0;
 		}
+		dustsize = 0;
 		return;
 	}
 	
@@ -75,14 +76,13 @@ void Dust::draw()
 			dust = 0;
 		}
 	}
-
-	dustsize = (size_t) r_dustsize->value();
-
-	if (!dustsize)	{
+	
+	if (dustsize <= 0) {
 		if (dust) {
 			free(dust);
 			dust = 0;
 		}
+		dustsize = 0;
 		return;
 	}
 
@@ -95,6 +95,7 @@ void Dust::draw()
 
 	if (!dust) {
 		con_debug << "  generating dust..." << std::endl;
+
 		dust = (float *) malloc(sizeof(float) * dustsize* 3);
 
 		for (size_t i = 0; i < dustsize; i++) {
@@ -120,21 +121,20 @@ void Dust::draw()
 	math::Vector3f v;
 
 	for (size_t i = 0; i < dustsize; i++) {
-		v.assign(core::localcontrol()->location());
-		for (size_t j = 0; j < 3; j++)
-			v[j] -=  dust[i*3+j];
-
-		if (v.lengthsquared() > (core::localcontrol()->radius() + DUSTDISTANCE)*(core::localcontrol()->radius() + DUSTDISTANCE)) {
-
-			dust[i*3] = core::localcontrol()->location().x +  (math::randomf(2) - 1) * (DUSTDISTANCE + core::localcontrol()->radius());
-			dust[i*3+1] = core::localcontrol()->location().y + (math::randomf(2) - 1) * (DUSTDISTANCE + core::localcontrol()->radius());
-			dust[i*3+2] = core::localcontrol()->location().z + (math::randomf(2) - 1) * (DUSTDISTANCE + core::localcontrol()->radius());
+		float dsquare = 0;
+		for (size_t j = 0; j < 3; j++) {
+			dsquare += (core::localcontrol()->location()[j] - dust[i*3+j]) * (core::localcontrol()->location()[j] - dust[i*3+j]);
+			v[j] = dust[i*3+j] - Camera::eye()[j];
 		}
 
-		for (size_t j = 0; j < 3; j++)
-			v[j] = dust[i*3+j];
-		v -= Camera::eye();
+		if (dsquare > (core::localcontrol()->radius() + DUSTDISTANCE)*(core::localcontrol()->radius() + DUSTDISTANCE)) {
+			for (size_t j = 0; j < 3; j++) {
+				dust[i*3+j] = core::localcontrol()->location()[j] +  (math::randomf(2) - 1) * (DUSTDISTANCE + core::localcontrol()->radius());
+				v[j] = dust[i*3+j] - Camera::eye()[j];
+			}
+		}
 		gl::vertex(v);
+
 		v -= core::localcontrol()->state()->axis().forward() * traillength;
 		gl::vertex(v);
 	}