From e21d5ad650130631e17662ce8f22d15315ab597a Mon Sep 17 00:00:00 2001
From: jsmall-nvidia <jsmall@nvidia.com>
Date: Wed, 21 Nov 2018 13:41:34 -0500
Subject: Feature/early depth stencil (#727)

* First pass support for early depth stencil.

* Add a simple test to check if output has attributes.

* Use cross compilation to test [earlydepthstencil] on glsl.

* If target is dxil, use dxc to test against.
Add hlsl to test earlydepthstencil against.

* * Added spSessionHasCompileTargetSupport
* Made slang-test use spSessionHasCompileTargetSupport to ignore tests that cannot run
---
 source/slang/emit.cpp | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

(limited to 'source/slang/emit.cpp')

diff --git a/source/slang/emit.cpp b/source/slang/emit.cpp
index a3b99691d..bf98a1b24 100644
--- a/source/slang/emit.cpp
+++ b/source/slang/emit.cpp
@@ -4702,6 +4702,14 @@ struct EmitVisitor
 
             break;
         }
+        case Stage::Pixel:
+        {
+            if (irFunc->findDecoration<IREarlyDepthStencilDecoration>())
+            {
+                emit("[earlydepthstencil]\n");
+            }
+            break;
+        }
         // TODO: There are other stages that will need this kind of handling.
         default:
             break;
@@ -4709,7 +4717,7 @@ struct EmitVisitor
     }
 
     void emitIREntryPointAttributes_GLSL(
-        IRFunc*             /*irFunc*/,
+        IRFunc*             irFunc,
         EmitContext*        /*ctx*/,
         EntryPointLayout*   entryPointLayout)
     {
@@ -4805,6 +4813,15 @@ struct EmitVisitor
 
         }
         break;
+        case Stage::Pixel:
+        {
+            if (irFunc->findDecoration<IREarlyDepthStencilDecoration>())
+            {
+                // https://www.khronos.org/opengl/wiki/Early_Fragment_Test
+                emit("layout(early_fragment_tests) in;\n");
+            }
+            break;
+        }
         // TODO: There are other stages that will need this kind of handling.
         default:
             break;
-- 
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