Initial tests for performance improvements.

modules/galaxy/shaders/galaxyraycast.glsl

@@ -29,17 +29,18 @@ uniform float absorptionMultiply#{id} = 50.0;
 uniform float emissionMultiply#{id} = 1500.0;
 uniform sampler3D galaxyTexture#{id};
 
-void sample#{id}(vec3 samplePos,
+void sample#{id}(
+  vec3 samplePos,
   vec3 dir,
   inout vec3 accumulatedColor,
   inout vec3 accumulatedAlpha,
-  inout float stepSize)
-  {
+  inout float stepSize
+  ) {
     vec3 aspect = aspect#{id};
     stepSize = maxStepSize#{id} / length(dir / aspect);
 
     //Early ray termination on black parts of the data
-    vec3 normalizedPos = samplePos*2.0 - 1.0;
+    vec3 normalizedPos = samplePos * 2.f - 1.f;
     if (normalizedPos.x * normalizedPos.x + normalizedPos.y * normalizedPos.y > 0.7) {
         return;
     }
@@ -51,12 +52,12 @@ void sample#{id}(vec3 samplePos,
     sampledColor = sampledColor*sampledColor;
 
     // Fudge for the dust "spreading"
-    sampledColor.a = clamp(sampledColor.a, 0.0, 1.0);
-    sampledColor.a = pow(sampledColor.a, 0.7);
+    sampledColor.a = clamp(sampledColor.a, 0.f, 1.f);
+    sampledColor.a = pow(sampledColor.a, 0.7f);
 
     // Absorption probability
     float scaledDensity = sampledColor.a * stepSize * absorptionMultiply#{id};
-    vec3 alphaTint = vec3(0.3, 0.54, 0.85);
+    vec3 alphaTint = vec3(0.3f, 0.54f, 0.85f);
     vec3 absorption = alphaTint * scaledDensity;
 
     // Extinction
@@ -67,10 +68,10 @@ void sample#{id}(vec3 samplePos,
     accumulatedColor.rgb +=
         sampledColor.rgb * stepSize * emissionMultiply#{id} * opacityCoefficient#{id};
 
-    vec3 oneMinusFrontAlpha = vec3(1.0) - accumulatedAlpha;
+    vec3 oneMinusFrontAlpha = vec3(1.f) - accumulatedAlpha;
     accumulatedAlpha += oneMinusFrontAlpha * sampledColor.rgb  * opacityCoefficient#{id};
   }
 
   float stepSize#{id}(vec3 samplePos, vec3 dir) {
-    return maxStepSize#{id} * length(dir * 1.0 / aspect#{id});
+    return maxStepSize#{id} * length(dir * 1.f / aspect#{id});
   }