From 37a3d0771d015bfc64bd9bd6ef87e294cf5a3a59 Mon Sep 17 00:00:00 2001
From: assiduous <assiduous@diligentgraphics.com>
Date: Sun, 8 Nov 2020 12:19:20 -0800
Subject: Broken shader test: added broken MSL; added
 SHADER_SOURCE_LANGUAGE_MSL

---
 Graphics/GraphicsEngine/interface/Shader.h         |  3 +++
 Tests/DiligentCoreAPITest/src/BrokenShaderTest.cpp | 30 ++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/Graphics/GraphicsEngine/interface/Shader.h b/Graphics/GraphicsEngine/interface/Shader.h
index dce77a82..bb4acc84 100644
--- a/Graphics/GraphicsEngine/interface/Shader.h
+++ b/Graphics/GraphicsEngine/interface/Shader.h
@@ -71,6 +71,9 @@ DILIGENT_TYPED_ENUM(SHADER_SOURCE_LANGUAGE, Uint32)
     /// The source language is GLSL
     SHADER_SOURCE_LANGUAGE_GLSL,
 
+    /// The source language is Metal shading language (MSL)
+    SHADER_SOURCE_LANGUAGE_MSL,
+
     /// The source language is GLSL that should be compiled verbatim
 
     /// By default the engine prepends GLSL shader source code with platform-specific
diff --git a/Tests/DiligentCoreAPITest/src/BrokenShaderTest.cpp b/Tests/DiligentCoreAPITest/src/BrokenShaderTest.cpp
index 2320f1c3..d69eb9c2 100644
--- a/Tests/DiligentCoreAPITest/src/BrokenShaderTest.cpp
+++ b/Tests/DiligentCoreAPITest/src/BrokenShaderTest.cpp
@@ -49,6 +49,25 @@ void VSMain()
 }
 )";
 
+static const char g_BrokenMSL[] = R"(
+#include <metal_stdlib>
+#include <simd/simd.h>
+
+using namespace metal;
+
+struct VSOut
+{
+    float4 pos [[position]];
+};
+
+vertex VSOut vs_main()
+{
+    VSOut out = {};
+    out.pos = float3(0.0, 0.0, 0.0);
+    return out;
+}
+)";
+
 void TestBrokenShader(const char* Source, const char* Name, SHADER_SOURCE_LANGUAGE SourceLanguage, int ErrorAllowance)
 {
     auto* pEnv    = TestingEnvironment::GetInstance();
@@ -98,4 +117,15 @@ TEST(Shader, BrokenGLSL)
                      deviceCaps.IsGLDevice() ? 2 : 3);
 }
 
+TEST(Shader, BrokenMSL)
+{
+    const auto& deviceCaps = TestingEnvironment::GetInstance()->GetDevice()->GetDeviceCaps();
+    if (!deviceCaps.IsMetalDevice())
+    {
+        GTEST_SKIP() << "MSL is only supported in Metal";
+    }
+
+    TestBrokenShader(g_BrokenMSL, "Broken MSL test", SHADER_SOURCE_LANGUAGE_MSL, 2);
+}
+
 } // namespace
-- 
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