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-rw-r--r--src/emu/inputdev.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/src/emu/inputdev.h b/src/emu/inputdev.h
index f6f0027b325..ecae0532be0 100644
--- a/src/emu/inputdev.h
+++ b/src/emu/inputdev.h
@@ -15,6 +15,21 @@
//**************************************************************************
+// CONSTANTS
+//**************************************************************************
+
+// relative devices return ~512 units per onscreen pixel
+constexpr s32 INPUT_RELATIVE_PER_PIXEL = 512;
+
+// absolute devices return values between -65536 and +65536
+constexpr s32 INPUT_ABSOLUTE_MIN = -65536;
+constexpr s32 INPUT_ABSOLUTE_MAX = 65536;
+
+// invalid memory value for axis polling
+constexpr s32 INVALID_AXIS_VALUE = 0x7fffffff;
+
+
+//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
@@ -95,11 +110,13 @@ public:
// helpers
s32 update_value();
void set_memory(s32 value) { m_memory = value; }
+ bool check_axis(input_item_modifier modifier);
// readers
virtual s32 read_as_switch(input_item_modifier modifier) = 0;
virtual s32 read_as_relative(input_item_modifier modifier) = 0;
virtual s32 read_as_absolute(input_item_modifier modifier) = 0;
+ virtual bool item_check_axis(input_item_modifier modifier) = 0;
protected:
// internal state