Simplify wind handling

Author: guillaume-haerinck

project01/shader/cloth_cs.glsl

@@ -11,9 +11,9 @@ uniform float RestLengthVert;
 uniform float RestLengthDiag;
 uniform float DeltaT = 0.000005;
 uniform float DampingConst = 0.1;
-uniform bool HasWind = true;
-uniform float WindStrength = 2;
-uniform vec3 WindDir = vec3(4, 0, 2);
+uniform float HasWind = 1.0;
+uniform float WindStrength = 3;
+uniform vec3 WindDir = vec3(0.6, 0, 0.3);
 
 layout(std430, binding=0) buffer PosIn {
   vec4 PositionIn[];
@@ -27,9 +27,6 @@ layout(std430, binding=2) buffer VelIn {
 layout(std430, binding=3) buffer VelOut {
   vec4 VelocityOut[];
 };
-layout(std430, binding=4) buffer NormIn {
-  vec4 Normal[];
-};
 
 void main() {
   uvec3 nParticles = gl_NumWorkGroups * gl_WorkGroupSize;
@@ -86,18 +83,7 @@ void main() {
   }
 
   force += -DampingConst * v;
-
-  if (HasWind)
-  {
-	vec3 normalized_wind_dir;
-	if (WindDir == vec3(0.0f, 0.0f, 0.0f))
-		normalized_wind_dir = glm::vec3(0.0f, 0.0f, 0.0f);
-	else
-		normalized_wind_dir = normalize(WindDir);
-
-	vec3 f_wind = WindStrength * dot(Normal[idx].xyz, normalized_wind_dir) * Normal[idx].xyz;
-	force += f_wind;
-  }
+  force += WindStrength * WindDir * HasWind;
 
   // Apply simple Euler integrator
   vec3 a = force * ParticleInvMass;