doodle/render/sdl/sdl.go

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// Package sdl provides an SDL2 renderer for Doodle.
package sdl
import (
"errors"
"time"
"git.kirsle.net/apps/doodle/events"
"git.kirsle.net/apps/doodle/render"
"github.com/veandco/go-sdl2/sdl"
"github.com/veandco/go-sdl2/ttf"
)
// Renderer manages the SDL state.
type Renderer struct {
// Configurable fields.
title string
width int32
height int32
startTime time.Time
// Private fields.
events *events.State
window *sdl.Window
renderer *sdl.Renderer
running bool
ticks uint64
// Optimizations to minimize SDL calls.
lastColor render.Color
}
// New creates the SDL renderer.
func New(title string, width, height int) *Renderer {
return &Renderer{
events: events.New(),
title: title,
width: int32(width),
height: int32(height),
}
}
// Teardown tasks when exiting the program.
func (r *Renderer) Teardown() {
r.renderer.Destroy()
r.window.Destroy()
sdl.Quit()
}
// Setup the renderer.
func (r *Renderer) Setup() error {
// Initialize SDL.
log.Info("Initializing SDL")
if err := sdl.Init(sdl.INIT_EVERYTHING); err != nil {
return err
}
// Initialize SDL_TTF.
log.Info("Initializing SDL_TTF")
if err := ttf.Init(); err != nil {
return err
}
// Create our window.
log.Info("Creating the Main Window")
window, err := sdl.CreateWindow(
r.title,
sdl.WINDOWPOS_CENTERED,
sdl.WINDOWPOS_CENTERED,
r.width,
r.height,
sdl.WINDOW_SHOWN,
)
if err != nil {
return err
}
r.window = window
// Blank out the window in white.
log.Info("Creating the SDL Renderer")
renderer, err := sdl.CreateRenderer(window, -1, sdl.RENDERER_ACCELERATED)
if err != nil {
panic(err)
}
renderer.SetDrawBlendMode(sdl.BLENDMODE_BLEND)
r.renderer = renderer
return nil
}
// GetTicks gets SDL's current tick count.
func (r *Renderer) GetTicks() uint32 {
return sdl.GetTicks()
}
// Poll for events.
func (r *Renderer) Poll() (*events.State, error) {
s := r.events
for event := sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
switch t := event.(type) {
case *sdl.QuitEvent:
return s, errors.New("quit")
case *sdl.MouseMotionEvent:
if DebugMouseEvents {
log.Debug("[%d ms] tick:%d MouseMotion type:%d id:%d x:%d y:%d xrel:%d yrel:%d",
t.Timestamp, r.ticks, t.Type, t.Which, t.X, t.Y, t.XRel, t.YRel,
)
}
// Push the cursor position.
s.CursorX.Push(t.X)
s.CursorY.Push(t.Y)
s.Button1.Push(t.State == 1)
case *sdl.MouseButtonEvent:
if DebugClickEvents {
log.Debug("[%d ms] tick:%d MouseButton type:%d id:%d x:%d y:%d button:%d state:%d",
t.Timestamp, r.ticks, t.Type, t.Which, t.X, t.Y, t.Button, t.State,
)
}
// Push the cursor position.
s.CursorX.Push(t.X)
s.CursorY.Push(t.Y)
// Is a mouse button pressed down?
if t.Button == 1 {
var eventName string
if t.State == 1 && s.Button1.Now == false {
eventName = "DOWN"
} else if t.State == 0 && s.Button1.Now == true {
eventName = "UP"
}
if eventName != "" {
s.Button1.Push(eventName == "DOWN")
// Return the event immediately.
return s, nil
}
}
// s.Button2.Push(t.Button == 3 && t.State == 1)
case *sdl.MouseWheelEvent:
if DebugMouseEvents {
log.Debug("[%d ms] tick:%d MouseWheel type:%d id:%d x:%d y:%d",
t.Timestamp, r.ticks, t.Type, t.Which, t.X, t.Y,
)
}
case *sdl.KeyboardEvent:
if DebugKeyEvents {
log.Debug("[%d ms] tick:%d Keyboard type:%d sym:%c modifiers:%d state:%d repeat:%d\n",
t.Timestamp, r.ticks, t.Type, t.Keysym.Sym, t.Keysym.Mod, t.State, t.Repeat,
)
}
switch t.Keysym.Scancode {
case sdl.SCANCODE_ESCAPE:
if t.Repeat == 1 {
continue
}
s.EscapeKey.Push(t.State == 1)
case sdl.SCANCODE_RETURN:
if t.Repeat == 1 {
continue
}
s.EnterKey.Push(t.State == 1)
case sdl.SCANCODE_F12:
s.ScreenshotKey.Push(t.State == 1)
case sdl.SCANCODE_UP:
s.Up.Push(t.State == 1)
case sdl.SCANCODE_LEFT:
s.Left.Push(t.State == 1)
case sdl.SCANCODE_RIGHT:
s.Right.Push(t.State == 1)
case sdl.SCANCODE_DOWN:
s.Down.Push(t.State == 1)
case sdl.SCANCODE_LSHIFT:
case sdl.SCANCODE_RSHIFT:
s.ShiftActive.Push(t.State == 1)
continue
case sdl.SCANCODE_LALT:
case sdl.SCANCODE_RALT:
case sdl.SCANCODE_LCTRL:
case sdl.SCANCODE_RCTRL:
continue
case sdl.SCANCODE_BACKSPACE:
// Make it a key event with "\b" as the sequence.
if t.State == 1 || t.Repeat == 1 {
s.KeyName.Push(`\b`)
}
default:
// Push the string value of the key.
if t.State == 1 {
s.KeyName.Push(string(t.Keysym.Sym))
}
}
}
}
return s, nil
}
// Present the current frame.
func (r *Renderer) Present() error {
r.renderer.Present()
return nil
}
// Delay using sdl.Delay
func (r *Renderer) Delay(time uint32) {
sdl.Delay(time)
}
// Loop is the main loop.
func (r *Renderer) Loop() error {
return nil
}