From ede5386d53a453cb56c9b1c80de0a80322ddc6f1 Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Mon, 17 Dec 2018 19:09:25 +0100
Subject: Try out velocity norm color mapping

---
 src/shader/code/collide.glsl  | 32 ++++++++++++++++----------------
 src/shader/code/geometry.glsl | 10 ++++------
 src/shader/code/vertex.glsl   | 10 +++++++++-
 3 files changed, 29 insertions(+), 23 deletions(-)

(limited to 'src/shader')

diff --git a/src/shader/code/collide.glsl b/src/shader/code/collide.glsl
index 3982ad8..f960dcd 100644
--- a/src/shader/code/collide.glsl
+++ b/src/shader/code/collide.glsl
@@ -13,7 +13,19 @@ uniform uint nY;
 const uint  q     = 9;
 const float omega = 0.6;
 
-const float displayAmplifier = 1000.;
+const float displayAmplifier = 10.;
+
+float comp(int x, int y, vec2 v) {
+	return x*v.x + y*v.y;
+}
+
+float sq(float x) {
+	return x*x;
+}
+
+float norm(vec2 v) {
+	return sqrt(sq(v.x)+sq(v.y));
+}
 
 float get(uint x, uint y, int i, int j) {
 	return collideCells[q*nX*y + q*x + (i+1)*3 + j+1];
@@ -24,9 +36,9 @@ void set(uint x, uint y, int i, int j, float v) {
 }
 
 void setFluid(uint x, uint y, vec2 v, float d) {
-	fluidCells[3*nX*y + 3*x + 0] = float(x)-nX/2 + displayAmplifier*v.x;
-	fluidCells[3*nX*y + 3*x + 1] = float(y)-nY/2 + displayAmplifier*v.y;
-	fluidCells[3*nX*y + 3*x + 2] = d;
+	fluidCells[3*nX*y + 3*x + 0] = float(x)-nX/2;// + displayAmplifier*v.x;
+	fluidCells[3*nX*y + 3*x + 1] = float(y)-nY/2;// + displayAmplifier*v.y;
+	fluidCells[3*nX*y + 3*x + 2] = displayAmplifier * norm(v);
 }
 
 float density(uint x, uint y) {
@@ -70,18 +82,6 @@ float w(int i, int j) {
 	}
 }
 
-float comp(int x, int y, vec2 v) {
-	return x*v.x + y*v.y;
-}
-
-float sq(float x) {
-	return x*x;
-}
-
-float norm(vec2 v) {
-	return sqrt(sq(v.x)+sq(v.y));
-}
-
 void main() {
 	const uint x = gl_GlobalInvocationID.x;
 	const uint y = gl_GlobalInvocationID.y;
diff --git a/src/shader/code/geometry.glsl b/src/shader/code/geometry.glsl
index 6ecfc99..e74d52f 100644
--- a/src/shader/code/geometry.glsl
+++ b/src/shader/code/geometry.glsl
@@ -17,7 +17,7 @@ vec4 project(vec4 v) {
 }
 
 void emitSquareAt(vec4 position) {
-	const float size = 0.2;
+	const float size = 0.5;
 
 	gl_Position = project(position + vec4(-size, -size, 0.0, 0.0));
 	EmitVertex();
@@ -30,10 +30,8 @@ void emitSquareAt(vec4 position) {
 }
 
 void main() {
-	if ( gl_in[0].gl_Position.xyz != vec3(0.,0.,0.) ) {
-		color = gs_in[0].color;
-		emitSquareAt(gl_in[0].gl_Position);
-		EndPrimitive();
-	}
+	color = gs_in[0].color;
+	emitSquareAt(gl_in[0].gl_Position);
+	EndPrimitive();
 }
 )";
diff --git a/src/shader/code/vertex.glsl b/src/shader/code/vertex.glsl
index 453b6fa..516f2c6 100644
--- a/src/shader/code/vertex.glsl
+++ b/src/shader/code/vertex.glsl
@@ -7,8 +7,16 @@ out VS_OUT {
 	vec3 color;
 } vs_out;
 
+float unit(float x) {
+	return 1.0/(1.0+exp(-x));
+}
+
+vec3 getColor(float x) {
+	return x*vec3(1.0,0.0,0.0) + (1-x)*vec3(-0.5,0.0,1.0);
+}
+
 void main() {
 	gl_Position  = vec4(VertexPosition.xy, 0., 1.);
-	vs_out.color = vec3(VertexPosition.z, 0., 0.);
+	vs_out.color = getColor(unit(VertexPosition.z));
 }
 )";
-- 
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