HLSL: Add a resource remapping API similar to MSL.

Allows more flexibility of how resources are assigned without having to
remap decorations.

1 files changed, 56 insertions, 0 deletions

diff --git a/spirv_common.hpp b/spirv_common.hpp
index f25486a6..b3043cf6 100644
--- a/spirv_common.hpp
+++ b/spirv_common.hpp
@@ -1694,6 +1694,62 @@ static inline bool opcode_is_sign_invariant(spv::Op opcode)
 		return false;
 	}
 }
+
+struct SetBindingPair
+{
+	uint32_t desc_set;
+	uint32_t binding;
+
+	inline bool operator==(const SetBindingPair &other) const
+	{
+		return desc_set == other.desc_set && binding == other.binding;
+	}
+
+	inline bool operator<(const SetBindingPair &other) const
+	{
+		return desc_set < other.desc_set || (desc_set == other.desc_set && binding < other.binding);
+	}
+};
+
+struct StageSetBinding
+{
+	spv::ExecutionModel model;
+	uint32_t desc_set;
+	uint32_t binding;
+
+	inline bool operator==(const StageSetBinding &other) const
+	{
+		return model == other.model && desc_set == other.desc_set && binding == other.binding;
+	}
+};
+
+struct InternalHasher
+{
+	inline size_t operator()(const SetBindingPair &value) const
+	{
+		// Quality of hash doesn't really matter here.
+		auto hash_set = std::hash<uint32_t>()(value.desc_set);
+		auto hash_binding = std::hash<uint32_t>()(value.binding);
+		return (hash_set * 0x10001b31) ^ hash_binding;
+	}
+
+	inline size_t operator()(const StageSetBinding &value) const
+	{
+		// Quality of hash doesn't really matter here.
+		auto hash_model = std::hash<uint32_t>()(value.model);
+		auto hash_set = std::hash<uint32_t>()(value.desc_set);
+		auto tmp_hash = (hash_model * 0x10001b31) ^ hash_set;
+		return (tmp_hash * 0x10001b31) ^ value.binding;
+	}
+};
+
+// Special constant used in a {MSL,HLSL}ResourceBinding desc_set
+// element to indicate the bindings for the push constants.
+static const uint32_t ResourceBindingPushConstantDescriptorSet = ~(0u);
+
+// Special constant used in a {MSL,HLSL}ResourceBinding binding
+// element to indicate the bindings for the push constants.
+static const uint32_t ResourceBindingPushConstantBinding = 0;
 } // namespace SPIRV_CROSS_NAMESPACE
 
 namespace std