[core] move StencilMode to gfx namespace

2 files changed, 78 insertions, 0 deletions

diff --git a/src/mbgl/gfx/stencil_mode.hpp b/src/mbgl/gfx/stencil_mode.hpp
new file mode 100644
index 0000000000..3ba2687b8c
--- /dev/null
+++ b/src/mbgl/gfx/stencil_mode.hpp
@@ -0,0 +1,56 @@
+#pragma once
+
+#include <mbgl/gfx/types.hpp>
+#include <mbgl/util/variant.hpp>
+
+namespace mbgl {
+namespace gfx {
+
+class StencilMode {
+public:
+    template <StencilFunctionType F>
+    struct SimpleTest {
+        static constexpr StencilFunctionType func = F;
+        static constexpr uint32_t mask = 0;
+    };
+
+    template <StencilFunctionType F>
+    struct MaskedTest {
+        static constexpr StencilFunctionType func = F;
+        uint32_t mask;
+    };
+
+    using Never        = SimpleTest<StencilFunctionType::Never>;
+    using Less         = MaskedTest<StencilFunctionType::Less>;
+    using Equal        = MaskedTest<StencilFunctionType::Equal>;
+    using LessEqual    = MaskedTest<StencilFunctionType::LessEqual>;
+    using Greater      = MaskedTest<StencilFunctionType::Greater>;
+    using NotEqual     = MaskedTest<StencilFunctionType::NotEqual>;
+    using GreaterEqual = MaskedTest<StencilFunctionType::GreaterEqual>;
+    using Always       = SimpleTest<StencilFunctionType::Always>;
+
+    using Test = variant<
+        Never,
+        Less,
+        Equal,
+        LessEqual,
+        Greater,
+        NotEqual,
+        GreaterEqual,
+        Always>;
+
+    Test test;
+    int32_t ref;
+    uint32_t mask;
+
+    StencilOpType fail;
+    StencilOpType depthFail;
+    StencilOpType pass;
+
+    static StencilMode disabled() {
+       return StencilMode { Always(), 0, 0, StencilOpType::Keep, StencilOpType::Keep, StencilOpType::Keep };
+    }
+};
+
+} // namespace gfx
+} // namespace mbgl
diff --git a/src/mbgl/gfx/types.hpp b/src/mbgl/gfx/types.hpp
index 264fa67b04..8faa9dc7f9 100644
--- a/src/mbgl/gfx/types.hpp
+++ b/src/mbgl/gfx/types.hpp
@@ -55,5 +55,27 @@ enum class DepthMaskType : bool {
     ReadWrite = true,
 };
 
+enum class StencilFunctionType : uint8_t {
+    Never,
+    Less,
+    Equal,
+    LessEqual,
+    Greater,
+    NotEqual,
+    GreaterEqual,
+    Always,
+};
+
+enum class StencilOpType : uint8_t {
+    Zero,
+    Keep,
+    Replace,
+    Increment,
+    Decrement,
+    Invert,
+    IncrementWrap,
+    DecrementWrap,
+};
+
 } // namespace gfx
 } // namespace mbgl