[2021.2][ShaderGraph] Fixing Gradient node divide by zero warnings

com.unity.shadergraph/CHANGELOG.md

@@ -55,9 +55,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed an issue where users can't create multiple Boolean or Enum keywords on the blackboard. [1329021](https://issuetracker.unity3d.com/issues/shadergraph-cant-create-multiple-boolean-or-enum-keywords)
 - Fixed an issue where generated property reference names could conflict with Shader Graph reserved keywords [1328762] (https://issuetracker.unity3d.com/product/unity/issues/guid/1328762/)
 - Fixed a ShaderGraph issue where ObjectField focus and Node selections would both capture deletion commands [1313943].
-
 - Fixed a bug when a node was both vertex and fragment exclusive but could still be used causing a shader compiler error [1316128].
-
+- Fixed divide by zero warnings when using the Sample Gradient Node
 
 ## [11.0.0] - 2020-10-21
 

com.unity.shadergraph/Editor/Data/Nodes/Input/Gradient/SampleGradientNode.cs

@@ -40,7 +40,7 @@ static string Unity_SampleGradientV0(
 {
     $precision3 color = Gradient.colors[0].rgb;
     [unroll]
-    for (int c = 1; c < 8; c++)
+    for (int c = 1; c < Gradient.colorsLength; c++)
     {
         $precision colorPos = saturate((Time - Gradient.colors[c - 1].w) / (Gradient.colors[c].w - Gradient.colors[c - 1].w)) * step(c, Gradient.colorsLength - 1);
         color = lerp(color, Gradient.colors[c].rgb, lerp(colorPos, step(0.01, colorPos), Gradient.type));
@@ -50,7 +50,7 @@ static string Unity_SampleGradientV0(
 #endif
     $precision alpha = Gradient.alphas[0].x;
     [unroll]
-    for (int a = 1; a < 8; a++)
+    for (int a = 1; a < Gradient.alphasLength; a++)
     {
         $precision alphaPos = saturate((Time - Gradient.alphas[a - 1].y) / (Gradient.alphas[a].y - Gradient.alphas[a - 1].y)) * step(a, Gradient.alphasLength - 1);
         alpha = lerp(alpha, Gradient.alphas[a].x, lerp(alphaPos, step(0.01, alphaPos), Gradient.type));
@@ -71,7 +71,7 @@ static string Unity_SampleGradientV1(
 {
     $precision3 color = Gradient.colors[0].rgb;
     [unroll]
-    for (int c = 1; c < 8; c++)
+    for (int c = 1; c < Gradient.colorsLength; c++)
     {
         $precision colorPos = saturate((Time - Gradient.colors[c - 1].w) / (Gradient.colors[c].w - Gradient.colors[c - 1].w)) * step(c, Gradient.colorsLength - 1);
         color = lerp(color, Gradient.colors[c].rgb, lerp(colorPos, step(0.01, colorPos), Gradient.type));
@@ -81,7 +81,7 @@ static string Unity_SampleGradientV1(
 #endif
     $precision alpha = Gradient.alphas[0].x;
     [unroll]
-    for (int a = 1; a < 8; a++)
+    for (int a = 1; a < Gradient.alphasLength; a++)
     {
         $precision alphaPos = saturate((Time - Gradient.alphas[a - 1].y) / (Gradient.alphas[a].y - Gradient.alphas[a - 1].y)) * step(a, Gradient.alphasLength - 1);
         alpha = lerp(alpha, Gradient.alphas[a].x, lerp(alphaPos, step(0.01, alphaPos), Gradient.type));