From 8df8940bced82cad259bc8144aa3668871222d22 Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Wed, 19 Dec 2018 19:31:10 +0100
Subject: Use GLSL's mix function for color scaling

---
 src/main.cc                 |  4 ++--
 src/shader/code/vertex.glsl | 11 +++++------
 2 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/src/main.cc b/src/main.cc
index c19b32d..3048979 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -23,8 +23,8 @@
 
 #include "timer.h"
 
-constexpr GLuint nX = 512;
-constexpr GLuint nY = 512;
+constexpr GLuint nX = 256;
+constexpr GLuint nY = 256;
 
 constexpr int lups = 50; // max lattice updates per second
 
diff --git a/src/shader/code/vertex.glsl b/src/shader/code/vertex.glsl
index 1051d8f..700a9b7 100644
--- a/src/shader/code/vertex.glsl
+++ b/src/shader/code/vertex.glsl
@@ -24,17 +24,12 @@ float norm(vec2 v) {
 	return sqrt(sq(v.x)+sq(v.y));
 }
 
-vec3 getColor(float x) {
-	return x*vec3(1.0,0.0,0.0) + (1-x)*vec3(-0.5,0.0,1.0);
-}
-
 vec2 fluidVertexAtIndex(uint i) {
 	const float y = floor(float(i) / float(nX));
 	return vec2(
 		i - nX*y,
 		y
 	);
-
 }
 
 void main() {
@@ -47,6 +42,10 @@ void main() {
 		1.
 	);
 
-	vs_out.color = getColor(unit(displayAmplifier * VertexPosition.z * norm(VertexPosition.xy)));
+	vs_out.color = mix(
+		vec3(-0.5, 0.0, 1.0),
+		vec3( 1.0, 0.0, 0.0),
+		displayAmplifier * VertexPosition.z * norm(VertexPosition.xy)
+	);
 }
 )";
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