From cdfdf1c094a870e017606d003c3ecdeb9215df16 Mon Sep 17 00:00:00 2001
From: Unity Technologies <@unity.com>
Date: Wed, 10 Jul 2019 02:17:32 +0000
Subject: [PATCH] com.unity.render-pipelines.core@1.1.11-preview

---
 CoreRP/ShaderLibrary/UnityInstancing.hlsl | 25 +++++++++++++++++++----
 package.json                              |  2 +-
 2 files changed, 22 insertions(+), 5 deletions(-)

diff --git a/CoreRP/ShaderLibrary/UnityInstancing.hlsl b/CoreRP/ShaderLibrary/UnityInstancing.hlsl
index 219ed0a..be46cc0 100644
--- a/CoreRP/ShaderLibrary/UnityInstancing.hlsl
+++ b/CoreRP/ShaderLibrary/UnityInstancing.hlsl
@@ -9,7 +9,7 @@
     #define UNITY_SUPPORT_INSTANCING
 #endif
 
-#if defined(SHADER_API_D3D11)
+#if defined(SHADER_API_D3D11) || defined(SHADER_API_GLCORE) || defined(SHADER_API_GLES3)
     #define UNITY_SUPPORT_STEREO_INSTANCING
 #endif
 
@@ -92,8 +92,13 @@
 // - UNITY_TRANSFER_VERTEX_OUTPUT_STEREO    Copy stero target from input struct to output struct. Used in vertex shader.
 // - UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX
 #ifdef UNITY_STEREO_INSTANCING_ENABLED
+#if defined(SHADER_API_GLES3) || defined(SHADER_API_GLCORE)
+    #define DEFAULT_UNITY_VERTEX_OUTPUT_STEREO                          uint stereoTargetEyeIndexSV : SV_RenderTargetArrayIndex; uint stereoTargetEyeIndex : BLENDINDICES0;
+    #define DEFAULT_UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(output)       output.stereoTargetEyeIndexSV = unity_StereoEyeIndex; output.stereoTargetEyeIndex = unity_StereoEyeIndex;
+#else
     #define DEFAULT_UNITY_VERTEX_OUTPUT_STEREO                          uint stereoTargetEyeIndex : SV_RenderTargetArrayIndex;
     #define DEFAULT_UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(output)       output.stereoTargetEyeIndex = unity_StereoEyeIndex
+#endif
     #define DEFAULT_UNITY_TRANSFER_VERTEX_OUTPUT_STEREO(input, output)  output.stereoTargetEyeIndex = input.stereoTargetEyeIndex;
     #define DEFAULT_UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input) unity_StereoEyeIndex = input.stereoTargetEyeIndex;
 #elif defined(UNITY_STEREO_MULTIVIEW_ENABLED)
@@ -137,9 +142,21 @@
     void UnitySetupInstanceID(uint inputInstanceID)
     {
         #ifdef UNITY_STEREO_INSTANCING_ENABLED
-            // stereo eye index is automatically figured out from the instance ID
-            unity_StereoEyeIndex = inputInstanceID & 0x01;
-            unity_InstanceID = unity_BaseInstanceID + (inputInstanceID >> 1);
+            #if defined(SHADER_API_GLES3)
+                // We must calculate the stereo eye index differently for GLES3
+                // because otherwise,  the unity shader compiler will emit a bitfieldInsert function.
+                // bitfieldInsert requires support for glsl version 400 or later.  Therefore the
+                // generated glsl code will fail to compile on lower end devices.  By changing the
+                // way we calculate the stereo eye index,  we can help the shader compiler to avoid
+                // emitting the bitfieldInsert function and thereby increase the number of devices we
+                // can run stereo instancing on.
+                unity_StereoEyeIndex = round(fmod(inputInstanceID, 2.0));
+                unity_InstanceID = unity_BaseInstanceID + (inputInstanceID >> 1);
+            #else
+                // stereo eye index is automatically figured out from the instance ID
+                unity_StereoEyeIndex = inputInstanceID & 0x01;
+                unity_InstanceID = unity_BaseInstanceID + (inputInstanceID >> 1);
+            #endif
         #else
             unity_InstanceID = inputInstanceID + unity_BaseInstanceID;
         #endif
diff --git a/package.json b/package.json
index 490874f..398a58a 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
     "name": "com.unity.render-pipelines.core",
     "displayName": "SRP Core",
     "description": "Core library for Unity render pipelines.",
-    "version": "1.1.10-preview",
+    "version": "1.1.11-preview",
     "unity": "2018.1",
     "dependencies": {
         "com.unity.postprocessing": "2.0.7-preview"