81 lines
1.7 KiB
Go
81 lines
1.7 KiB
Go
package main
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import (
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"github.com/veandco/go-sdl2/sdl"
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)
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/*
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Apple 2 supports four paddles and 3 pushbuttons. The first two paddles are
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the X, Y axis of the first joystick. The second two correspond the the second
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joystick.
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Button 0 is the primary button of joystick 0.
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Button 1 is the secondary button of joystick 0 but also the primary button of
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joystick 1.
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Button 2 is the secondary button of Joystick 1.
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*/
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type sdlJoysticks struct {
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paddle [4]uint8
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button [4]bool
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}
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func newSDLJoysticks() *sdlJoysticks {
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var j sdlJoysticks
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err := sdl.InitSubSystem(sdl.INIT_JOYSTICK)
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if err != nil {
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panic(err)
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}
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// Init up to two joysticks
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sdl.JoystickEventState(sdl.ENABLE)
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joyCount := sdl.NumJoysticks()
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for iJoy := 0; iJoy < joyCount && iJoy < 2; iJoy++ {
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/*joystick := */ sdl.JoystickOpen(iJoy)
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}
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// Initialize to maximum resistance if unpugged
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j.paddle[0] = 255
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j.paddle[1] = 255
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j.paddle[2] = 255
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j.paddle[3] = 255
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return &j
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}
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func (j *sdlJoysticks) putAxisEvent(e *sdl.JoyAxisEvent) {
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if e.Which >= 2 || e.Axis >= 2 {
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// Process only the first two axis of the first two joysticks
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return
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}
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j.paddle[uint8(e.Which)*2+e.Axis] = uint8((e.Value >> 8) + 128)
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}
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func (j *sdlJoysticks) putButtonEvent(e *sdl.JoyButtonEvent) {
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if e.Which >= 2 || e.Button >= 2 {
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// Process only the first two buttons of the first two joysticks
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return
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}
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j.button[uint8(e.Which)*2+e.Button] = (e.State != 0)
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}
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func (j *sdlJoysticks) ReadButton(i int) bool {
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switch i {
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case 0:
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return j.button[0]
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case 1:
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// It can be secondary of first or primary of second
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return j.button[1] || j.button[2]
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case 2:
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return j.button[3]
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default:
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return false
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}
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}
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func (j *sdlJoysticks) ReadPaddle(i int) uint8 {
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return j.paddle[i]
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}
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