rhi: metal: Add support for tessellation

Change-Id: Ie8d226a6a959aa5e78284ea72505fd26aec1e671
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

1 files changed, 76 insertions, 0 deletions

diff --git a/src/gui/rhi/qshaderdescription_p.h b/src/gui/rhi/qshaderdescription_p.h
index a64496ead7..df4e8fd873 100644
--- a/src/gui/rhi/qshaderdescription_p.h
+++ b/src/gui/rhi/qshaderdescription_p.h
@@ -181,6 +181,7 @@ public:
         ImageFormat imageFormat = ImageFormatUnknown;
         ImageFlags imageFlags;
         QList<int> arrayDims;
+        bool perPatch = false;
     };
 
     struct BlockVariable {
@@ -229,8 +230,76 @@ public:
     QList<InOutVariable> separateSamplers() const;
     QList<InOutVariable> storageImages() const;
 
+    enum BuiltinType {
+        // must match SpvBuiltIn
+        PositionBuiltin = 0,
+        PointSizeBuiltin = 1,
+        ClipDistanceBuiltin = 3,
+        CullDistanceBuiltin = 4,
+        VertexIdBuiltin = 5,
+        InstanceIdBuiltin = 6,
+        PrimitiveIdBuiltin = 7,
+        InvocationIdBuiltin = 8,
+        LayerBuiltin = 9,
+        ViewportIndexBuiltin = 10,
+        TessLevelOuterBuiltin = 11,
+        TessLevelInnerBuiltin = 12,
+        TessCoordBuiltin = 13,
+        PatchVerticesBuiltin = 14,
+        FragCoordBuiltin = 15,
+        PointCoordBuiltin = 16,
+        FrontFacingBuiltin = 17,
+        SampleIdBuiltin = 18,
+        SamplePositionBuiltin = 19,
+        SampleMaskBuiltin = 20,
+        FragDepthBuiltin = 22,
+        NumWorkGroupsBuiltin = 24,
+        WorkgroupSizeBuiltin = 25,
+        WorkgroupIdBuiltin = 26,
+        LocalInvocationIdBuiltin = 27,
+        GlobalInvocationIdBuiltin = 28,
+        LocalInvocationIndexBuiltin = 29,
+        VertexIndexBuiltin = 42,
+        InstanceIndexBuiltin = 43
+    };
+
+    struct BuiltinVariable {
+        BuiltinType type;
+    };
+
+    QList<BuiltinVariable> inputBuiltinVariables() const;
+    QList<BuiltinVariable> outputBuiltinVariables() const;
+
     std::array<uint, 3> computeShaderLocalSize() const;
 
+    uint tessellationOutputVertexCount() const;
+
+    enum TessellationMode {
+        UnknownTessellationMode,
+        TrianglesTessellationMode,
+        QuadTessellationMode,
+        IsolineTessellationMode
+    };
+
+    TessellationMode tessellationMode() const;
+
+    enum TessellationWindingOrder {
+        UnknownTessellationWindingOrder,
+        CwTessellationWindingOrder,
+        CcwTessellationWindingOrder
+    };
+
+    TessellationWindingOrder tessellationWindingOrder() const;
+
+    enum TessellationPartitioning {
+        UnknownTessellationPartitioning,
+        EqualTessellationPartitioning,
+        FractionalEvenTessellationPartitioning,
+        FractionalOddTessellationPartitioning
+    };
+
+    TessellationPartitioning tessellationPartitioning() const;
+
 private:
     QShaderDescriptionPrivate *d;
     friend struct QShaderDescriptionPrivate;
@@ -249,6 +318,7 @@ Q_GUI_EXPORT QDebug operator<<(QDebug, const QShaderDescription::BlockVariable &
 Q_GUI_EXPORT QDebug operator<<(QDebug, const QShaderDescription::UniformBlock &);
 Q_GUI_EXPORT QDebug operator<<(QDebug, const QShaderDescription::PushConstantBlock &);
 Q_GUI_EXPORT QDebug operator<<(QDebug, const QShaderDescription::StorageBlock &);
+Q_GUI_EXPORT QDebug operator<<(QDebug, const QShaderDescription::BuiltinVariable &);
 #endif
 
 Q_GUI_EXPORT bool operator==(const QShaderDescription &lhs, const QShaderDescription &rhs) noexcept;
@@ -257,6 +327,7 @@ Q_GUI_EXPORT bool operator==(const QShaderDescription::BlockVariable &lhs, const
 Q_GUI_EXPORT bool operator==(const QShaderDescription::UniformBlock &lhs, const QShaderDescription::UniformBlock &rhs) noexcept;
 Q_GUI_EXPORT bool operator==(const QShaderDescription::PushConstantBlock &lhs, const QShaderDescription::PushConstantBlock &rhs) noexcept;
 Q_GUI_EXPORT bool operator==(const QShaderDescription::StorageBlock &lhs, const QShaderDescription::StorageBlock &rhs) noexcept;
+Q_GUI_EXPORT bool operator==(const QShaderDescription::BuiltinVariable &lhs, const QShaderDescription::BuiltinVariable &rhs) noexcept;
 
 inline bool operator!=(const QShaderDescription &lhs, const QShaderDescription &rhs) noexcept
 {
@@ -288,6 +359,11 @@ inline bool operator!=(const QShaderDescription::StorageBlock &lhs, const QShade
     return !(lhs == rhs);
 }
 
+inline bool operator!=(const QShaderDescription::BuiltinVariable &lhs, const QShaderDescription::BuiltinVariable &rhs) noexcept
+{
+    return !(lhs == rhs);
+}
+
 QT_END_NAMESPACE
 
 #endif