gopher.go

package main

import (
	"image/color"
	"machine"
	"runtime/interrupt"
	"runtime/volatile"
	"unsafe"
)

var (
	//KeyCodes / Buttons
	keyDOWN      = uint16(895)
	keyUP        = uint16(959)
	keyLEFT      = uint16(991)
	keyRIGHT     = uint16(1007)
	keyLSHOULDER = uint16(511)
	keyRSHOULDER = uint16(767)
	keyA         = uint16(1022)
	keyB         = uint16(1021)
	keySTART     = uint16(1015)
	keySELECT    = uint16(1019)

	// Register display
	regDISPSTAT = (*volatile.Register16)(unsafe.Pointer(uintptr(0x4000004)))

	// Register keypad
	regKEYPAD = (*volatile.Register16)(unsafe.Pointer(uintptr(0x04000130)))

	// Display from machine
	display = machine.Display

	// Screen resolution
	screenWidth, screenHeight = display.Size()

	// Colors
	black = color.RGBA{}
	white = color.RGBA{255, 255, 255, 255}
	green = color.RGBA{0, 255, 0, 255}
	red   = color.RGBA{255, 0, 0, 255}

	// Google colors
	gBlue   = color.RGBA{66, 163, 244, 255}
	gRed    = color.RGBA{219, 68, 55, 255}
	gYellow = color.RGBA{244, 160, 0, 255}
	gGreen  = color.RGBA{15, 157, 88, 255}

	// Coordinates
	x int16 = 100 //TODO: horizontally center
	y int16 = 100 //TODO: vertically center

	// Global Score that also works as a time/counter
	score int16 = 0

	// Global state, if game is not paused
	active bool = false
)

func main() {
	// Set up the display
	display.Configure()

	// Register display status
	regDISPSTAT.SetBits(1<<3 | 1<<4)

	// Display Gopher text message and draw our Gophers
	drawGophers()

	// Creates an interrupt that will call the "update" function below, hardware way to display things on the screen
	interrupt.New(machine.IRQ_VBLANK, update).Enable()

	// Infinite loop to avoid exiting the application
	for {
	}
}