Set GL version to 3.1 (lowest possible version), fixed cleanup bug when calling Stop(), added input handling.

input.go

@@ -0,0 +1,98 @@
+package goga
+
+import (
+	"github.com/go-gl/glfw/v3.2/glfw"
+)
+
+var (
+	keyboardListener []KeyboardListener
+	mouseListener    []MouseListener
+)
+
+// Interface for keyboard input events.
+// Implement and register to receive keyboard input.
+type KeyboardListener interface {
+	OnKeyEvent(glfw.Key, int, glfw.Action, glfw.ModifierKey)
+}
+
+// Interface for mouse input events.
+// Implement and register to receive mouse input.
+type MouseListener interface {
+	OnMouseButton(glfw.MouseButton, glfw.Action, glfw.ModifierKey)
+	OnMouseMove(float64, float64)
+	OnMouseScroll(float64, float64)
+}
+
+func initInput(wnd *glfw.Window) {
+	wnd.SetKeyCallback(keyboardCallback)
+	wnd.SetMouseButtonCallback(mouseButtonCallback)
+	wnd.SetCursorPosCallback(mouseMoveCallback)
+	wnd.SetScrollCallback(mouseScrollCallback)
+
+	keyboardListener = make([]KeyboardListener, 0)
+	mouseListener = make([]MouseListener, 0)
+}
+
+func keyboardCallback(wnd *glfw.Window, key glfw.Key, code int, action glfw.Action, mod glfw.ModifierKey) {
+	for _, listener := range keyboardListener {
+		listener.OnKeyEvent(key, code, action, mod)
+	}
+}
+
+func mouseButtonCallback(wnd *glfw.Window, button glfw.MouseButton, action glfw.Action, mod glfw.ModifierKey) {
+	for _, listener := range mouseListener {
+		listener.OnMouseButton(button, action, mod)
+	}
+}
+
+func mouseMoveCallback(wnd *glfw.Window, x float64, y float64) {
+	for _, listener := range mouseListener {
+		listener.OnMouseMove(x, float64(viewportHeight)-y)
+	}
+}
+
+func mouseScrollCallback(wnd *glfw.Window, x float64, y float64) {
+	for _, listener := range mouseListener {
+		listener.OnMouseScroll(x, y)
+	}
+}
+
+// Adds a new keyboard listener.
+func AddKeyboardListener(listener KeyboardListener) {
+	keyboardListener = append(keyboardListener, listener)
+}
+
+// Removes given keyboard listener if found.
+func RemoveKeyboardListener(listener KeyboardListener) {
+	for i, l := range keyboardListener {
+		if l == listener {
+			keyboardListener = append(keyboardListener[:i], keyboardListener[i+1:]...)
+			return
+		}
+	}
+}
+
+// Removes all registered keyboard listeners.
+func RemoveAllKeyboardListener() {
+	keyboardListener = make([]KeyboardListener, 0)
+}
+
+// Adds a new mouse listener.
+func AddMouseListener(listener MouseListener) {
+	mouseListener = append(mouseListener, listener)
+}
+
+// Removes given mouse listener if found.
+func RemoveMouseListener(listener MouseListener) {
+	for i, l := range mouseListener {
+		if l == listener {
+			mouseListener = append(mouseListener[:i], mouseListener[i+1:]...)
+			return
+		}
+	}
+}
+
+// Removes all registered mouse listeners.
+func RemoveAllMouseListener() {
+	mouseListener = make([]MouseListener, 0)
+}