doodle/doodle.go

172 lines
3.2 KiB
Go

package doodle
import (
"fmt"
"time"
"git.kirsle.net/apps/doodle/events"
"git.kirsle.net/apps/doodle/render"
"github.com/kirsle/golog"
"github.com/veandco/go-sdl2/sdl"
"github.com/veandco/go-sdl2/ttf"
)
const (
// Version number.
Version = "0.0.1-alpha"
// TargetFPS is the frame rate to cap the game to.
TargetFPS = 1000 / 60 // 60 FPS
// Millisecond64 is a time.Millisecond casted to float64.
Millisecond64 = float64(time.Millisecond)
)
// Doodle is the game object.
type Doodle struct {
Debug bool
startTime time.Time
running bool
ticks uint64
events *events.State
width int32
height int32
scene Scene
window *sdl.Window
renderer *sdl.Renderer
}
// New initializes the game object.
func New(debug bool) *Doodle {
d := &Doodle{
Debug: debug,
startTime: time.Now(),
events: events.New(),
running: true,
width: 800,
height: 600,
}
if !debug {
log.Config.Level = golog.InfoLevel
}
return d
}
// Run initializes SDL and starts the main loop.
func (d *Doodle) Run() error {
// Initialize SDL.
log.Info("Initializing SDL")
if err := sdl.Init(sdl.INIT_EVERYTHING); err != nil {
return err
}
defer sdl.Quit()
// 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(
"Doodle v"+Version,
sdl.WINDOWPOS_CENTERED,
sdl.WINDOWPOS_CENTERED,
d.width,
d.height,
sdl.WINDOW_SHOWN,
)
if err != nil {
return err
}
defer window.Destroy()
d.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)
}
d.renderer = renderer
render.Renderer = renderer
defer renderer.Destroy()
// Set up the default scene.
if d.scene == nil {
d.Goto(&EditorScene{})
}
log.Info("Enter Main Loop")
for d.running {
d.ticks++
// Poll for events.
_, err := d.events.Poll(d.ticks)
if err != nil {
log.Error("event poll error: %s", err)
return err
}
// Draw a frame and log how long it took.
start := time.Now()
err = d.scene.Loop(d)
if err != nil {
return err
}
elapsed := time.Now().Sub(start)
// Delay to maintain the target frames per second.
tmp := elapsed / time.Millisecond
var delay uint32
if TargetFPS-int(tmp) > 0 { // make sure it won't roll under
delay = uint32(TargetFPS - int(tmp))
}
sdl.Delay(delay)
// Track how long this frame took to measure FPS over time.
d.TrackFPS(delay)
}
log.Warn("Main Loop Exited! Shutting down...")
return nil
}
// LoadLevel loads a map from JSON into the EditorScene.
func (d *Doodle) LoadLevel(filename string) error {
log.Info("Loading level from file: %s", filename)
scene := &EditorScene{}
err := scene.LoadLevel(filename)
if err != nil {
return err
}
d.Goto(scene)
return nil
}
// TODO: not a global
type Pixel struct {
start bool
x int32
y int32
dx int32
dy int32
}
func (p Pixel) String() string {
return fmt.Sprintf("(%d,%d) delta (%d,%d)",
p.x, p.y,
p.dx, p.dy,
)
}
// Grid is a 2D grid of pixels in X,Y notation.
type Grid map[Pixel]interface{}