MSL: Split out early_fragment_tests.

Was causing compilation failures, jumped the merge a bit too soon.

reference/opt/shaders-msl/frag/depth-greater-than.frag

@@ -8,7 +8,7 @@ struct main0_out
     float gl_FragDepth [[depth(greater)]];
 };
 
-[[ early_fragment_tests ]] fragment main0_out main0()
+fragment main0_out main0()
 {
     main0_out out = {};
     out.gl_FragDepth = 0.5;

reference/opt/shaders-msl/frag/depth-less-than.frag

@@ -8,7 +8,7 @@ struct main0_out
     float gl_FragDepth [[depth(less)]];
 };
 
-[[ early_fragment_tests ]] fragment main0_out main0()
+fragment main0_out main0()
 {
     main0_out out = {};
     out.gl_FragDepth = 0.5;

reference/opt/shaders-msl/frag/early-fragment-tests.frag

@@ -0,0 +1,17 @@
+#include <metal_stdlib>
+#include <simd/simd.h>
+
+using namespace metal;
+
+struct main0_out
+{
+    float4 FragColor [[color(0)]];
+};
+
+[[ early_fragment_tests ]] fragment main0_out main0()
+{
+    main0_out out = {};
+    out.FragColor = float4(1.0);
+    return out;
+}
+

reference/shaders-msl/frag/depth-greater-than.frag

@@ -8,7 +8,7 @@ struct main0_out
     float gl_FragDepth [[depth(greater)]];
 };
 
-[[ early_fragment_tests ]] fragment main0_out main0()
+fragment main0_out main0()
 {
     main0_out out = {};
     out.gl_FragDepth = 0.5;

reference/shaders-msl/frag/depth-less-than.frag

@@ -8,7 +8,7 @@ struct main0_out
     float gl_FragDepth [[depth(less)]];
 };
 
-[[ early_fragment_tests ]] fragment main0_out main0()
+fragment main0_out main0()
 {
     main0_out out = {};
     out.gl_FragDepth = 0.5;

reference/shaders-msl/frag/early-fragment-tests.frag

@@ -0,0 +1,17 @@
+#include <metal_stdlib>
+#include <simd/simd.h>
+
+using namespace metal;
+
+struct main0_out
+{
+    float4 FragColor [[color(0)]];
+};
+
+[[ early_fragment_tests ]] fragment main0_out main0()
+{
+    main0_out out = {};
+    out.FragColor = float4(1.0);
+    return out;
+}
+

shaders-msl/frag/depth-greater-than.frag

@@ -1,5 +1,4 @@
 #version 450
-layout(early_fragment_tests) in;
 layout(depth_greater) out float gl_FragDepth;
 
 void main()

shaders-msl/frag/depth-less-than.frag

@@ -1,5 +1,4 @@
 #version 450
-layout(early_fragment_tests) in;
 layout(depth_less) out float gl_FragDepth;
 
 void main()

shaders-msl/frag/early-fragment-tests.frag

@@ -0,0 +1,9 @@
+#version 450
+layout(early_fragment_tests) in;
+
+layout(location = 0) out vec4 FragColor;
+
+void main()
+{
+	FragColor = vec4(1.0);
+}