Fixes for Metal mesh-shader

reference/opt/shaders-msl/mesh/mesh-shader-basic-lines.msl3.spv14.vk.nocompat.mesh

@@ -168,7 +168,7 @@ void _4(threadgroup spvUnsafeArray<uint2, 22>& gl_PrimitiveLineIndicesEXT, threa
         return;
     }
     spvMesh.set_primitive_count(spvMeshSizes.y);
-    const uint spvThreadCount = (gl_WorkGroupSize.x * gl_WorkGroupSize.y * gl_WorkGroupSize.z);
+    const uint spvThreadCount [[maybe_unused]] = (gl_WorkGroupSize.x * gl_WorkGroupSize.y * gl_WorkGroupSize.z);
     const uint spvVI = gl_LocalInvocationIndex;
     if (gl_LocalInvocationIndex < spvMeshSizes.x)
     {
@@ -177,6 +177,7 @@ void _4(threadgroup spvUnsafeArray<uint2, 22>& gl_PrimitiveLineIndicesEXT, threa
         spvV.gl_PointSize = gl_MeshVerticesEXT[spvVI].gl_PointSize;
         spvV.gl_ClipDistance[0] = gl_MeshVerticesEXT[spvVI].gl_ClipDistance[0];
         spvV.gl_ClipDistance_0 = gl_MeshVerticesEXT[spvVI].gl_ClipDistance[0];
+        spvV.vOut = vOut[spvVI];
         spvV.outputs_a = outputs[spvVI].a;
         spvV.outputs_b = outputs[spvVI].b;
         spvMesh.set_vertex(spvVI, spvV);

reference/opt/shaders-msl/mesh/mesh-shader-basic-triangle.msl3.spv14.vk.nocompat.mesh

@@ -168,7 +168,7 @@ void _4(threadgroup spvUnsafeArray<gl_MeshPerVertexEXT, 24>& gl_MeshVerticesEXT,
         return;
     }
     spvMesh.set_primitive_count(spvMeshSizes.y);
-    const uint spvThreadCount = (gl_WorkGroupSize.x * gl_WorkGroupSize.y * gl_WorkGroupSize.z);
+    const uint spvThreadCount [[maybe_unused]] = (gl_WorkGroupSize.x * gl_WorkGroupSize.y * gl_WorkGroupSize.z);
     const uint spvVI = gl_LocalInvocationIndex;
     if (gl_LocalInvocationIndex < spvMeshSizes.x)
     {
@@ -177,6 +177,7 @@ void _4(threadgroup spvUnsafeArray<gl_MeshPerVertexEXT, 24>& gl_MeshVerticesEXT,
         spvV.gl_PointSize = gl_MeshVerticesEXT[spvVI].gl_PointSize;
         spvV.gl_ClipDistance[0] = gl_MeshVerticesEXT[spvVI].gl_ClipDistance[0];
         spvV.gl_ClipDistance_0 = gl_MeshVerticesEXT[spvVI].gl_ClipDistance[0];
+        spvV.vOut = vOut[spvVI];
         spvV.outputs_a = outputs[spvVI].a;
         spvV.outputs_b = outputs[spvVI].b;
         spvMesh.set_vertex(spvVI, spvV);

reference/opt/shaders-msl/mesh/mesh-shader-flat-varying.msl3.spv14.vk.nocompat.mesh

@@ -0,0 +1,121 @@
+#pragma clang diagnostic ignored "-Wmissing-prototypes"
+#pragma clang diagnostic ignored "-Wmissing-braces"
+
+#include <metal_stdlib>
+#include <simd/simd.h>
+
+using namespace metal;
+
+template<typename T, size_t Num>
+struct spvUnsafeArray
+{
+    T elements[Num ? Num : 1];
+
+    thread T& operator [] (size_t pos) thread
+    {
+        return elements[pos];
+    }
+    constexpr const thread T& operator [] (size_t pos) const thread
+    {
+        return elements[pos];
+    }
+
+    device T& operator [] (size_t pos) device
+    {
+        return elements[pos];
+    }
+    constexpr const device T& operator [] (size_t pos) const device
+    {
+        return elements[pos];
+    }
+
+    constexpr const constant T& operator [] (size_t pos) const constant
+    {
+        return elements[pos];
+    }
+
+    threadgroup T& operator [] (size_t pos) threadgroup
+    {
+        return elements[pos];
+    }
+    constexpr const threadgroup T& operator [] (size_t pos) const threadgroup
+    {
+        return elements[pos];
+    }
+
+    object_data T& operator [] (size_t pos) object_data
+    {
+        return elements[pos];
+    }
+    constexpr const object_data T& operator [] (size_t pos) const object_data
+    {
+        return elements[pos];
+    }
+};
+
+void spvSetMeshOutputsEXT(uint gl_LocalInvocationIndex, threadgroup uint2& spvMeshSizes, uint vertexCount, uint primitiveCount)
+{
+    if (gl_LocalInvocationIndex == 0)
+    {
+        spvMeshSizes.x = vertexCount;
+        spvMeshSizes.y = primitiveCount;
+    }
+}
+
+struct gl_MeshPerVertexEXT
+{
+    float4 gl_Position [[position]];
+    float gl_ClipDistance [[clip_distance]] [1];
+};
+
+constant uint3 gl_WorkGroupSize [[maybe_unused]] = uint3(2u, 3u, 4u);
+
+struct spvPerVertex
+{
+    float4 gl_Position [[position]];
+    float gl_ClipDistance [[clip_distance]] [1];
+    float gl_ClipDistance_0 [[user(clip0)]];
+    float fOut [[user(locn0)]];
+    uint uiOut [[user(locn1)]];
+};
+
+using spvMesh_t = mesh<spvPerVertex, void, 24, 22, topology::triangle>;
+
+static inline __attribute__((always_inline))
+void _4(threadgroup spvUnsafeArray<gl_MeshPerVertexEXT, 24>& gl_MeshVerticesEXT, thread uint& gl_LocalInvocationIndex, thread uint3& gl_GlobalInvocationID, threadgroup spvUnsafeArray<float, 24>& fOut, threadgroup spvUnsafeArray<uint, 24>& uiOut, threadgroup uint2& spvMeshSizes)
+{
+    spvSetMeshOutputsEXT(gl_LocalInvocationIndex, spvMeshSizes, 24u, 22u);
+    gl_MeshVerticesEXT[gl_LocalInvocationIndex].gl_Position = float4(float3(gl_GlobalInvocationID), 1.0);
+    gl_MeshVerticesEXT[gl_LocalInvocationIndex].gl_ClipDistance[0] = 4.0;
+    fOut[gl_LocalInvocationIndex] = float(gl_GlobalInvocationID.x);
+    uiOut[gl_LocalInvocationIndex] = gl_GlobalInvocationID.y;
+}
+
+[[mesh]] void main0(uint gl_LocalInvocationIndex [[thread_index_in_threadgroup]], uint3 gl_GlobalInvocationID [[thread_position_in_grid]], spvMesh_t spvMesh)
+{
+    threadgroup uint2 spvMeshSizes;
+    threadgroup spvUnsafeArray<gl_MeshPerVertexEXT, 24> gl_MeshVerticesEXT;
+    threadgroup spvUnsafeArray<float, 24> fOut;
+    threadgroup spvUnsafeArray<uint, 24> uiOut;
+    if (gl_LocalInvocationIndex == 0) spvMeshSizes.y = 0u;
+    _4(gl_MeshVerticesEXT, gl_LocalInvocationIndex, gl_GlobalInvocationID, fOut, uiOut, spvMeshSizes);
+    threadgroup_barrier(mem_flags::mem_threadgroup);
+    if (spvMeshSizes.y == 0)
+    {
+        return;
+    }
+    spvMesh.set_primitive_count(spvMeshSizes.y);
+    const uint spvThreadCount [[maybe_unused]] = (gl_WorkGroupSize.x * gl_WorkGroupSize.y * gl_WorkGroupSize.z);
+    const uint spvVI = gl_LocalInvocationIndex;
+    if (gl_LocalInvocationIndex < spvMeshSizes.x)
+    {
+        spvPerVertex spvV = {};
+        spvV.gl_Position = gl_MeshVerticesEXT[spvVI].gl_Position;
+        spvV.gl_ClipDistance[0] = gl_MeshVerticesEXT[spvVI].gl_ClipDistance[0];
+        spvV.gl_ClipDistance_0 = gl_MeshVerticesEXT[spvVI].gl_ClipDistance[0];
+        spvV.fOut = fOut[spvVI];
+        spvV.uiOut = uiOut[spvVI];
+        spvMesh.set_vertex(spvVI, spvV);
+    }
+}
+

reference/shaders-msl/mesh/mesh-shader-basic-lines.msl3.spv14.vk.nocompat.mesh

@@ -177,7 +177,7 @@ void _4(threadgroup spvUnsafeArray<uint2, 22>& gl_PrimitiveLineIndicesEXT, threa
         return;
     }
     spvMesh.set_primitive_count(spvMeshSizes.y);
-    const uint spvThreadCount = (gl_WorkGroupSize.x * gl_WorkGroupSize.y * gl_WorkGroupSize.z);
+    const uint spvThreadCount [[maybe_unused]] = (gl_WorkGroupSize.x * gl_WorkGroupSize.y * gl_WorkGroupSize.z);
     const uint spvVI = gl_LocalInvocationIndex;
     if (gl_LocalInvocationIndex < spvMeshSizes.x)
     {
@@ -186,6 +186,7 @@ void _4(threadgroup spvUnsafeArray<uint2, 22>& gl_PrimitiveLineIndicesEXT, threa
         spvV.gl_PointSize = gl_MeshVerticesEXT[spvVI].gl_PointSize;
         spvV.gl_ClipDistance[0] = gl_MeshVerticesEXT[spvVI].gl_ClipDistance[0];
         spvV.gl_ClipDistance_0 = gl_MeshVerticesEXT[spvVI].gl_ClipDistance[0];
+        spvV.vOut = vOut[spvVI];
         spvV.outputs_a = outputs[spvVI].a;
         spvV.outputs_b = outputs[spvVI].b;
         spvMesh.set_vertex(spvVI, spvV);

reference/shaders-msl/mesh/mesh-shader-basic-triangle.msl3.spv14.vk.nocompat.mesh

@@ -165,7 +165,7 @@ void _4(threadgroup spvUnsafeArray<gl_MeshPerVertexEXT, 24>& gl_MeshVerticesEXT,
         return;
     }
     spvMesh.set_primitive_count(spvMeshSizes.y);
-    const uint spvThreadCount = (gl_WorkGroupSize.x * gl_WorkGroupSize.y * gl_WorkGroupSize.z);
+    const uint spvThreadCount [[maybe_unused]] = (gl_WorkGroupSize.x * gl_WorkGroupSize.y * gl_WorkGroupSize.z);
     const uint spvVI = gl_LocalInvocationIndex;
     if (gl_LocalInvocationIndex < spvMeshSizes.x)
     {
@@ -174,6 +174,7 @@ void _4(threadgroup spvUnsafeArray<gl_MeshPerVertexEXT, 24>& gl_MeshVerticesEXT,
         spvV.gl_PointSize = gl_MeshVerticesEXT[spvVI].gl_PointSize;
         spvV.gl_ClipDistance[0] = gl_MeshVerticesEXT[spvVI].gl_ClipDistance[0];
         spvV.gl_ClipDistance_0 = gl_MeshVerticesEXT[spvVI].gl_ClipDistance[0];
+        spvV.vOut = vOut[spvVI];
         spvV.outputs_a = outputs[spvVI].a;
         spvV.outputs_b = outputs[spvVI].b;
         spvMesh.set_vertex(spvVI, spvV);

reference/shaders-msl/mesh/mesh-shader-flat-varying.msl3.spv14.vk.nocompat.mesh

@@ -0,0 +1,121 @@
+#pragma clang diagnostic ignored "-Wmissing-prototypes"
+#pragma clang diagnostic ignored "-Wmissing-braces"
+
+#include <metal_stdlib>
+#include <simd/simd.h>
+
+using namespace metal;
+
+template<typename T, size_t Num>
+struct spvUnsafeArray
+{
+    T elements[Num ? Num : 1];
+
+    thread T& operator [] (size_t pos) thread
+    {
+        return elements[pos];
+    }
+    constexpr const thread T& operator [] (size_t pos) const thread
+    {
+        return elements[pos];
+    }
+
+    device T& operator [] (size_t pos) device
+    {
+        return elements[pos];
+    }
+    constexpr const device T& operator [] (size_t pos) const device
+    {
+        return elements[pos];
+    }
+
+    constexpr const constant T& operator [] (size_t pos) const constant
+    {
+        return elements[pos];
+    }
+
+    threadgroup T& operator [] (size_t pos) threadgroup
+    {
+        return elements[pos];
+    }
+    constexpr const threadgroup T& operator [] (size_t pos) const threadgroup
+    {
+        return elements[pos];
+    }
+
+    object_data T& operator [] (size_t pos) object_data
+    {
+        return elements[pos];
+    }
+    constexpr const object_data T& operator [] (size_t pos) const object_data
+    {
+        return elements[pos];
+    }
+};
+
+void spvSetMeshOutputsEXT(uint gl_LocalInvocationIndex, threadgroup uint2& spvMeshSizes, uint vertexCount, uint primitiveCount)
+{
+    if (gl_LocalInvocationIndex == 0)
+    {
+        spvMeshSizes.x = vertexCount;
+        spvMeshSizes.y = primitiveCount;
+    }
+}
+
+struct gl_MeshPerVertexEXT
+{
+    float4 gl_Position [[position]];
+    float gl_ClipDistance [[clip_distance]] [1];
+};
+
+constant uint3 gl_WorkGroupSize [[maybe_unused]] = uint3(2u, 3u, 4u);
+
+struct spvPerVertex
+{
+    float4 gl_Position [[position]];
+    float gl_ClipDistance [[clip_distance]] [1];
+    float gl_ClipDistance_0 [[user(clip0)]];
+    float fOut [[user(locn0)]];
+    uint uiOut [[user(locn1)]];
+};
+
+using spvMesh_t = mesh<spvPerVertex, void, 24, 22, topology::triangle>;
+
+static inline __attribute__((always_inline))
+void _4(threadgroup spvUnsafeArray<gl_MeshPerVertexEXT, 24>& gl_MeshVerticesEXT, thread uint& gl_LocalInvocationIndex, thread uint3& gl_GlobalInvocationID, threadgroup spvUnsafeArray<float, 24>& fOut, threadgroup spvUnsafeArray<uint, 24>& uiOut, threadgroup uint2& spvMeshSizes)
+{
+    spvSetMeshOutputsEXT(gl_LocalInvocationIndex, spvMeshSizes, 24u, 22u);
+    gl_MeshVerticesEXT[gl_LocalInvocationIndex].gl_Position = float4(float3(gl_GlobalInvocationID), 1.0);
+    gl_MeshVerticesEXT[gl_LocalInvocationIndex].gl_ClipDistance[0] = 4.0;
+    fOut[gl_LocalInvocationIndex] = float(gl_GlobalInvocationID.x);
+    uiOut[gl_LocalInvocationIndex] = gl_GlobalInvocationID.y;
+}
+
+[[mesh]] void main0(uint gl_LocalInvocationIndex [[thread_index_in_threadgroup]], uint3 gl_GlobalInvocationID [[thread_position_in_grid]], spvMesh_t spvMesh)
+{
+    threadgroup uint2 spvMeshSizes;
+    threadgroup spvUnsafeArray<gl_MeshPerVertexEXT, 24> gl_MeshVerticesEXT;
+    threadgroup spvUnsafeArray<float, 24> fOut;
+    threadgroup spvUnsafeArray<uint, 24> uiOut;
+    if (gl_LocalInvocationIndex == 0) spvMeshSizes.y = 0u;
+    _4(gl_MeshVerticesEXT, gl_LocalInvocationIndex, gl_GlobalInvocationID, fOut, uiOut, spvMeshSizes);
+    threadgroup_barrier(mem_flags::mem_threadgroup);
+    if (spvMeshSizes.y == 0)
+    {
+        return;
+    }
+    spvMesh.set_primitive_count(spvMeshSizes.y);
+    const uint spvThreadCount [[maybe_unused]] = (gl_WorkGroupSize.x * gl_WorkGroupSize.y * gl_WorkGroupSize.z);
+    const uint spvVI = gl_LocalInvocationIndex;
+    if (gl_LocalInvocationIndex < spvMeshSizes.x)
+    {
+        spvPerVertex spvV = {};
+        spvV.gl_Position = gl_MeshVerticesEXT[spvVI].gl_Position;
+        spvV.gl_ClipDistance[0] = gl_MeshVerticesEXT[spvVI].gl_ClipDistance[0];
+        spvV.gl_ClipDistance_0 = gl_MeshVerticesEXT[spvVI].gl_ClipDistance[0];
+        spvV.fOut = fOut[spvVI];
+        spvV.uiOut = uiOut[spvVI];
+        spvMesh.set_vertex(spvVI, spvV);
+    }
+}
+

shaders-msl/mesh/mesh-shader-flat-varying.msl3.spv14.vk.nocompat.mesh

@@ -0,0 +1,23 @@
+#version 450
+#extension GL_EXT_mesh_shader : require
+#extension GL_EXT_fragment_shading_rate : require
+layout(local_size_x = 2, local_size_y = 3, local_size_z = 4) in;
+layout(triangles, max_vertices = 24, max_primitives = 22) out;
+
+out gl_MeshPerVertexEXT
+{
+  vec4 gl_Position;
+  float gl_ClipDistance[1];
+} gl_MeshVerticesEXT[];
+
+layout(location = 0) out float fOut[];
+layout(location = 1) out flat uint uiOut[];
+
+void main()
+{
+  SetMeshOutputsEXT(24, 22);
+  gl_MeshVerticesEXT[gl_LocalInvocationIndex].gl_Position = vec4(gl_GlobalInvocationID, 1.0);
+  gl_MeshVerticesEXT[gl_LocalInvocationIndex].gl_ClipDistance[0] = 4.0;
+  fOut[gl_LocalInvocationIndex] = float(gl_GlobalInvocationID.x);
+  uiOut[gl_LocalInvocationIndex] = gl_GlobalInvocationID.y;
+}

spirv_msl.cpp

@@ -19215,7 +19215,7 @@ void CompilerMSL::emit_mesh_outputs()
 	end_scope();
 	statement("spvMesh.set_primitive_count(spvMeshSizes.y);");
 
-	statement("const uint spvThreadCount = (gl_WorkGroupSize.x * gl_WorkGroupSize.y * gl_WorkGroupSize.z);");
+	statement("const uint spvThreadCount [[maybe_unused]] = (gl_WorkGroupSize.x * gl_WorkGroupSize.y * gl_WorkGroupSize.z);");
 
 	if (mesh_out_per_vertex != 0)
 	{
@@ -19240,7 +19240,7 @@ void CompilerMSL::emit_mesh_outputs()
 			uint32_t orig_id = get_extended_member_decoration(type_vert.self, index, SPIRVCrossDecorationInterfaceMemberIndex);
 
 			// Clip/cull distances are special-case
-			if (orig_id == (~0u))
+			if (orig_var == 0 && orig_id == (~0u))
 				continue;
 
 			auto &orig = get<SPIRVariable>(orig_var);