From 762fb7fa5304a8e96757c091667d157f4a0bd311 Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Wed, 19 Dec 2018 21:05:58 +0100
Subject: Loopify density function

…seems to be correctly unrolled during compilation. Or at least no
performance impact is visible.
---
 src/shader/code/collide.glsl | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

(limited to 'src')

diff --git a/src/shader/code/collide.glsl b/src/shader/code/collide.glsl
index 75bfd35..7b5534a 100644
--- a/src/shader/code/collide.glsl
+++ b/src/shader/code/collide.glsl
@@ -80,15 +80,11 @@ void setFluid(uint x, uint y, vec2 v, float d) {
 
 float density(uint x, uint y) {
 	const uint idx = indexOfLatticeCell(x, y);
-	return collideCells[idx + 0]
-	     + collideCells[idx + 1]
-	     + collideCells[idx + 2]
-	     + collideCells[idx + 3]
-	     + collideCells[idx + 4]
-	     + collideCells[idx + 5]
-	     + collideCells[idx + 6]
-	     + collideCells[idx + 7]
-	     + collideCells[idx + 8];
+	float d = 0.;
+	for ( int i = 0; i < q; ++i ) {
+		d += collideCells[idx + i];
+	}
+	return d;
 }
 
 vec2 velocity(uint x, uint y, float d) {
-- 
cgit v1.2.3