ep2: Finish input system+opengl window+glsl compilation

input/input.go

@@ -0,0 +1,155 @@
+package input
+
+import "github.com/veandco/go-sdl2/sdl"
+
+type keyState struct {
+	Key                 sdl.Keycode
+	State               int
+	IsPressedThisFrame  bool
+	IsReleasedThisFrame bool
+}
+
+type mouseBtnState struct {
+	Btn   int
+	State int
+
+	IsPressedThisFrame  bool
+	IsReleasedThisFrame bool
+	IsDoubleClicked     bool
+}
+
+var (
+	keyMap      = make(map[sdl.Keycode]*keyState)
+	mouseBtnMap = make(map[int]*mouseBtnState)
+)
+
+func EventLoopStart() {
+
+	for _, v := range keyMap {
+		v.IsPressedThisFrame = false
+		v.IsReleasedThisFrame = false
+	}
+
+	for _, v := range mouseBtnMap {
+		v.IsPressedThisFrame = false
+		v.IsReleasedThisFrame = false
+		v.IsDoubleClicked = false
+	}
+}
+
+func HandleKeyboardEvent(e *sdl.KeyboardEvent) {
+
+	ks := keyMap[e.Keysym.Sym]
+	if ks == nil {
+		ks = &keyState{Key: e.Keysym.Sym}
+		keyMap[ks.Key] = ks
+	}
+
+	ks.State = int(e.State)
+	ks.IsPressedThisFrame = e.State == sdl.PRESSED && e.Repeat == 0
+	ks.IsReleasedThisFrame = e.State == sdl.RELEASED && e.Repeat == 0
+}
+
+func HandleMouseEvent(e *sdl.MouseButtonEvent) {
+
+	mb := mouseBtnMap[int(e.Button)]
+	if mb == nil {
+		mb = &mouseBtnState{Btn: int(e.Button)}
+		mouseBtnMap[int(e.Button)] = mb
+	}
+
+	mb.State = int(e.State)
+
+	mb.IsDoubleClicked = e.Clicks == 2 && e.State == sdl.PRESSED
+	mb.IsPressedThisFrame = e.State == sdl.PRESSED
+	mb.IsReleasedThisFrame = e.State == sdl.RELEASED
+}
+
+func KeyClicked(kc sdl.Keycode) bool {
+
+	ks := keyMap[kc]
+	if ks == nil {
+		return false
+	}
+
+	return ks.IsPressedThisFrame
+}
+
+func KeyReleased(kc sdl.Keycode) bool {
+
+	ks := keyMap[kc]
+	if ks == nil {
+		return false
+	}
+
+	return ks.IsReleasedThisFrame
+}
+
+func KeyDown(kc sdl.Keycode) bool {
+
+	ks := keyMap[kc]
+	if ks == nil {
+		return false
+	}
+
+	return ks.State == sdl.PRESSED
+}
+
+func KeyUp(kc sdl.Keycode) bool {
+
+	ks := keyMap[kc]
+	if ks == nil {
+		return true
+	}
+
+	return ks.State == sdl.RELEASED
+}
+
+func MouseClicked(mb int) bool {
+
+	btn := mouseBtnMap[mb]
+	if btn == nil {
+		return false
+	}
+
+	return btn.IsPressedThisFrame
+}
+
+func MouseDoubleClicked(mb int) bool {
+
+	btn := mouseBtnMap[mb]
+	if btn == nil {
+		return false
+	}
+
+	return btn.IsDoubleClicked
+}
+
+func MouseReleased(mb int) bool {
+	btn := mouseBtnMap[mb]
+	if btn == nil {
+		return false
+	}
+
+	return btn.IsReleasedThisFrame
+}
+
+func MouseDown(mb int) bool {
+
+	btn := mouseBtnMap[mb]
+	if btn == nil {
+		return false
+	}
+
+	return btn.State == sdl.PRESSED
+}
+
+func MouseUp(mb int) bool {
+
+	btn := mouseBtnMap[mb]
+	if btn == nil {
+		return true
+	}
+
+	return btn.State == sdl.RELEASED
+}