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import kotlinx.browser.document
import org.khronos.webgl.get
import org.w3c.dom.CanvasRenderingContext2D
import org.w3c.dom.HTMLCanvasElement
import org.w3c.dom.HTMLImageElement
import org.w3c.dom.asList
class TextureManager {
private lateinit var textures: List<Texture>
fun getTexture(id: Int): Texture {
return textures.find { it.id == id } ?: textures.first()
}
fun loadTextures(set: String) {
textures = document.getElementsByClassName("texture-definition").asList()
.map { it as HTMLImageElement }
.filter { it.getAttribute("data-set") == set }
.map {
val id = it.getAttribute("data-texture-id")!!.toInt()
val width = it.getAttribute("data-width")?.toInt() ?: 64
val height = it.getAttribute("data-height")?.toInt() ?: 64
Texture(id, width, height, parseImage(it, width, height))
}
Logger.log("Loaded ${textures.size} texture(s)")
}
private fun parseImage(image: HTMLImageElement, imageWidth: Int, imageHeight: Int): List<String> {
val canvas = (document.createElement("canvas") as HTMLCanvasElement)
.apply {
width = imageWidth
height = imageHeight
}
// Draw image to canvas and read back out to get RGBA data
val imageData = with(canvas.getContext("2d") as CanvasRenderingContext2D) {
drawImage(image, 0.0, 0.0, imageWidth.toDouble(), imageHeight.toDouble())
getImageData(0.0, 0.0, imageWidth.toDouble(), imageHeight.toDouble()).data
}
val cssColourPixelList = mutableListOf<String>()
for (i in 0 until imageData.length step 4) {
cssColourPixelList.add("rgb(${imageData[i]},${imageData[i+1]},${imageData[i+2]}")
}
return cssColourPixelList
}
}
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