MSL: extract global variables from subgroup ballot operations

Fixes #1513.

1 files changed, 30 insertions, 0 deletions

diff --git a/shaders-msl/frag/subgroup-globals-extract.msl22.frag b/shaders-msl/frag/subgroup-globals-extract.msl22.frag
new file mode 100644
index 00000000..f763163d
--- /dev/null
+++ b/shaders-msl/frag/subgroup-globals-extract.msl22.frag
@@ -0,0 +1,30 @@
+#version 450
+#extension GL_KHR_shader_subgroup_basic : require
+#extension GL_KHR_shader_subgroup_ballot : require
+
+layout(location = 0) out uvec2 FragColor;
+
+uint sub1() {
+	return subgroupBallotFindLSB(uvec4(1,2,3,4));
+}
+
+uint sub2() {
+	return subgroupBallotFindMSB(uvec4(1,2,3,4));
+}
+
+uint sub3() {
+	return subgroupBallotBitCount(uvec4(1,2,3,4));
+}
+
+uint sub4() {
+	return subgroupBallotInclusiveBitCount(uvec4(1,2,3,4));
+}
+
+uint sub5() {
+	return subgroupBallotExclusiveBitCount(uvec4(1,2,3,4));
+}
+
+void main()
+{
+	FragColor.x = sub1() + sub2() + sub3() + sub4() + sub5();
+}