From a39b14cacc6cfd888c8112bbf4c9458ead912b4d Mon Sep 17 00:00:00 2001
From: kingscallop <54776947+kingscallop@users.noreply.github.com>
Date: Sun, 16 Aug 2020 19:41:53 +0100
Subject: [PATCH] Fixes example 37 on Windows using AMD GCN 1.0 gpus (#2232)

When compiling shader cs_gdr_stream_compaction.sc on GCN 1.0 gpus
the following error appears:

Compute link error: HW_UNSUPPORTED.
ERROR: Internal compile error, error code: E_SC_NOTSUPPORTED
Shader not supported by HW

These changes avoid the error.
---
 .../cs_gdr_stream_compaction.sc                     | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/examples/37-gpudrivenrendering/cs_gdr_stream_compaction.sc b/examples/37-gpudrivenrendering/cs_gdr_stream_compaction.sc
index e8fcc64f3..b96bb5f9b 100644
--- a/examples/37-gpudrivenrendering/cs_gdr_stream_compaction.sc
+++ b/examples/37-gpudrivenrendering/cs_gdr_stream_compaction.sc
@@ -32,8 +32,11 @@ void main()
 	int NoofDrawcalls = int(u_cullingConfig.w);
 
 	int offset = 1;
-	temp[2 * tID    ] = uint(instancePredicates[2 * tID    ] ? 1 : 0); // load input into shared memory
-	temp[2 * tID + 1] = uint(instancePredicates[2 * tID + 1] ? 1 : 0);
+	bool predicate = instancePredicates[2 * tID];
+	temp[2 * tID] = uint(predicate ? 1 : 0);
+
+	predicate = instancePredicates[2 * tID + 1];
+	temp[2 * tID + 1] = uint(predicate ? 1 : 0);
 
 	int d;
 
@@ -80,7 +83,8 @@ void main()
 	int index = int(2 * tID);
 
 	// scatter results
-	if (instancePredicates[index])
+	predicate = instancePredicates[index];
+	if (predicate)
 	{
 		instanceDataOut[4 * temp[index]    ] = instanceDataIn[4 * index    ];
 		instanceDataOut[4 * temp[index] + 1] = instanceDataIn[4 * index + 1];
@@ -90,7 +94,8 @@ void main()
 
 	index = int(2 * tID + 1);
 
-	if (instancePredicates[index])
+	predicate = instancePredicates[index];
+	if (predicate)
 	{
 		instanceDataOut[4 * temp[index]    ] = instanceDataIn[4 * index    ];
 		instanceDataOut[4 * temp[index] + 1] = instanceDataIn[4 * index + 1];