Simple keyboard input & pause system

sdl/input_handler.go

@@ -0,0 +1,53 @@
+package sdl
+
+import (
+	"github.com/veandco/go-sdl2/sdl"
+)
+
+const EXPECTED_KEYBOARD_STATE_SIZE = 512
+
+type SdlInputHandler struct {
+	keyState     []uint8
+	lastKeyState []uint8
+}
+
+func (input *SdlInputHandler) IsKeyDown(key uint) bool {
+	keys := sdl.GetKeyboardState()
+
+	if keys[key] == 1 {
+		return true
+	}
+
+	return false
+}
+
+func (input *SdlInputHandler) IsKeyJustPressed(key uint) bool {
+	if input.keyState[key] == 1 && input.lastKeyState[key] == 0 {
+		return true
+	}
+
+	return false
+}
+
+func (input *SdlInputHandler) IsKeyJustReleased(key uint) bool {
+	if input.keyState[key] == 0 && input.lastKeyState[key] == 1 {
+		return true
+	}
+
+	return false
+}
+
+func (input *SdlInputHandler) Update() error {
+	copy(input.lastKeyState, input.keyState)
+	input.keyState = sdl.GetKeyboardState()
+
+	return nil
+}
+
+func NewSdlInputHandler() *SdlInputHandler {
+	handler := &SdlInputHandler{}
+	handler.lastKeyState = make([]uint8, EXPECTED_KEYBOARD_STATE_SIZE)
+	handler.keyState = make([]uint8, EXPECTED_KEYBOARD_STATE_SIZE)
+
+	return handler
+}