Platform/dx12/vfx rwbuffer fix (#3797)

* Use RWStructuredBuffer for strip data

* Update CHANGELOG.md

Author: Adrian1066

com.unity.visualeffectgraph/CHANGELOG.md

@@ -36,6 +36,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Remove some useless compilation triggers (modifying not connected or disabled nodes for instance)
 - Tidy up of platform abstraction code for random number generation, requires a dependency on com.unity.render-pipelines.core for those abstractions.
 - Fixed shader compilation errors with textures in shader graph [Case 1309219](https://issuetracker.unity3d.com/product/unity/issues/guid/1309219/)
+- Fixed issue with VFX using incorrect buffer type for strip data
 
 ## [11.0.0] - 2020-10-21
 ### Added

com.unity.visualeffectgraph/Shaders/UpdateStrips.compute

@@ -10,7 +10,7 @@ CBUFFER_START(params)
     uint particlePerStripCount;
 CBUFFER_END
 
-RWBuffer<uint> stripDataBuffer;
+RWStructuredBuffer<uint> stripDataBuffer;
 
 #include "Packages/com.unity.visualeffectgraph/Shaders/VFXParticleStripCommon.hlsl"
 

com.unity.visualeffectgraph/Shaders/VFXInit.template

@@ -30,7 +30,7 @@ ByteAddressBuffer inputAdditional;
 #endif
 
 #if HAS_STRIPS
-RWBuffer<uint> stripDataBuffer;
+RWStructuredBuffer<uint> stripDataBuffer;
 #endif
 
 ${VFXPerPassInclude}

com.unity.visualeffectgraph/Shaders/VFXUpdate.template

@@ -15,7 +15,7 @@ RWStructuredBuffer<uint> indirectBuffer;
 #endif
 
 #if HAS_STRIPS
-RWBuffer<uint> stripDataBuffer;
+RWStructuredBuffer<uint> stripDataBuffer;
 #endif
 
 #if VFX_USE_STRIPALIVE_CURRENT