dotzuki-cli 0.8.2

dotzuki CLI: scaffold (dotzuki new), compile-check (dotzuki check) and play (dotzuki run) zero-Rust JRPG projects
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package com.dotzuki.player

import android.content.Context
import android.graphics.Bitmap
import android.graphics.Canvas
import android.graphics.Color
import android.graphics.Paint
import android.graphics.RectF
import android.view.Choreographer
import android.view.SurfaceHolder
import android.view.SurfaceView
import java.nio.ByteBuffer
import java.nio.ByteOrder

class GameSurfaceView(context: Context) : SurfaceView(context), SurfaceHolder.Callback,
    Choreographer.FrameCallback {
    var inputBits: Int = 0
    private var active = false
    private var surfaceReady = false
    private var lastFrameNanos = 0L
    private var accumulator = 0.0
    private val frameWidth = NativeBridge.width()
    private val frameHeight = NativeBridge.height()
    private val frameLength = NativeBridge.frameLength()
    private val pixels = ByteBuffer.allocateDirect(frameLength).order(ByteOrder.nativeOrder())
    private val bitmap = Bitmap.createBitmap(frameWidth, frameHeight, Bitmap.Config.ARGB_8888)
    private val paint = Paint().apply { isFilterBitmap = false }

    init {
        holder.addCallback(this)
    }

    fun resumeFrames() {
        if (active) return
        active = true
        lastFrameNanos = 0L
        Choreographer.getInstance().postFrameCallback(this)
    }

    fun pauseFrames() {
        active = false
        inputBits = 0
        Choreographer.getInstance().removeFrameCallback(this)
    }

    override fun doFrame(frameTimeNanos: Long) {
        if (!active) return
        if (lastFrameNanos == 0L) {
            accumulator = STEP_SECONDS
        } else {
            accumulator += ((frameTimeNanos - lastFrameNanos) / 1_000_000_000.0)
                .coerceAtMost(STEP_SECONDS * 4.0)
        }
        lastFrameNanos = frameTimeNanos
        while (accumulator >= STEP_SECONDS) {
            NativeBridge.tick(inputBits)
            accumulator -= STEP_SECONDS
        }
        drawGameFrame()
        Choreographer.getInstance().postFrameCallback(this)
    }

    private fun drawGameFrame() {
        if (!surfaceReady || NativeBridge.copyFrame(pixels) != frameLength) return
        pixels.rewind()
        bitmap.copyPixelsFromBuffer(pixels)
        val canvas = holder.lockCanvas() ?: return
        try {
            canvas.drawColor(Color.BLACK)
            canvas.drawBitmap(bitmap, null, fitRect(canvas), paint)
        } finally {
            holder.unlockCanvasAndPost(canvas)
        }
    }

    private fun fitRect(canvas: Canvas): RectF {
        val scale = minOf(canvas.width.toFloat() / frameWidth, canvas.height.toFloat() / frameHeight)
        val width = frameWidth * scale
        val height = frameHeight * scale
        val left = (canvas.width - width) / 2f
        val top = (canvas.height - height) / 2f
        return RectF(left, top, left + width, top + height)
    }

    override fun surfaceCreated(holder: SurfaceHolder) {
        surfaceReady = true
    }

    override fun surfaceChanged(holder: SurfaceHolder, format: Int, width: Int, height: Int) = Unit

    override fun surfaceDestroyed(holder: SurfaceHolder) {
        surfaceReady = false
    }

    private companion object {
        const val STEP_SECONDS = 1.0 / 59.7275
    }
}