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September 28, 2022 13:08
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package io.github.sceneview.loaders | |
import android.content.Context | |
import com.google.android.filament.Engine | |
import com.google.android.filament.Material | |
import com.google.android.filament.MaterialInstance | |
import com.google.android.filament.Texture | |
import io.github.sceneview.material.setInvertFrontFaceWinding | |
import io.github.sceneview.material.setViewTexture | |
import io.github.sceneview.utils.loadFileBuffer | |
import io.github.sceneview.utils.readFileBuffer | |
import kotlinx.coroutines.* | |
import java.nio.Buffer | |
class MaterialLoader(engine: Engine, context: Context) { | |
private var _engine: Engine? = engine | |
private val engine get() = _engine!! | |
private var _context: Context? = context | |
private val context get() = _context!! | |
private val loadingJobs = mutableListOf<Job>() | |
private val materials = mutableListOf<Material>() | |
private val materialInstances = mutableListOf<MaterialInstance>() | |
val viewLitMaterial: Material by lazy { | |
createMaterial("materials/viewLit.filamat") | |
} | |
val viewUnlitMaterial: Material by lazy { | |
createMaterial("materials/viewUnlit.filamat") | |
} | |
/** | |
* Creates and returns a [Material] object | |
* | |
* A Filament Material defines the visual appearance of an object. Materials function as a | |
* templates from which [MaterialInstance]s can be spawned. | |
* | |
* Documentation: [Filament Materials Guide](https://google.github.io/filament/Materials.html) | |
* | |
* @param payload Specifies the material data. The material data is a binary blob produced by | |
* libfilamat or by matc. | |
* | |
* @see MaterialLoader.loadMaterial | |
*/ | |
fun createMaterial(payload: Buffer): Material = | |
Material.Builder() | |
.payload(payload, payload.remaining()) | |
.build(engine).also { material -> | |
materials += material | |
} | |
/** | |
* Creates and returns a [Material] object from Filamat asset file | |
* | |
* @see createMaterial | |
*/ | |
fun createMaterial(assetFileLocation: String): Material = | |
createMaterial(context.assets.readFileBuffer(assetFileLocation)) | |
/** | |
* Loads a [Material] from the contents of a Filamat file | |
* | |
* The material data is a binary blob produced by libfilamat or by matc. | |
* | |
* @param fileLocation the .filamat file location: | |
* - A relative asset file location *materials/mymaterial.filamat* | |
* - An Android resource from the res folder *context.getResourceUri(R.raw.mymaterial)* | |
* - A File path *Uri.fromFile(myMaterialFile).path* | |
* - An http or https url *https://mydomain.com/mymaterial.filamat* | |
*/ | |
suspend fun loadMaterial(fileLocation: String): Material? = | |
context.loadFileBuffer(fileLocation)?.let { buffer -> | |
withContext(Dispatchers.Main) { | |
createMaterial(buffer) | |
} | |
} | |
/** | |
* Loads a [Material] from the contents of a Filamat file within a created coroutine scope. | |
* | |
* @see loadMaterial | |
*/ | |
fun loadMaterialAsync(fileLocation: String, onResult: (Material?) -> Unit) = | |
CoroutineScope(Dispatchers.IO).launch { | |
loadMaterial(fileLocation).also(onResult) | |
}.also { | |
loadingJobs += it | |
} | |
fun createViewMaterial( | |
viewTexture: Texture, | |
unlit: Boolean = false, | |
invertFrontFaceWinding: Boolean = false | |
): MaterialInstance { | |
val material = if (unlit) viewLitMaterial else viewUnlitMaterial | |
val materialInstance = material.createInstance().apply { | |
setViewTexture(viewTexture) | |
setInvertFrontFaceWinding(invertFrontFaceWinding) | |
} | |
materialInstances += materialInstance | |
return materialInstance | |
} | |
fun destroyMaterial(material: Material) { | |
engine.destroyMaterial(material) | |
materials -= material | |
} | |
fun destroyMaterialInstance(materialInstance: MaterialInstance) { | |
engine.destroyMaterialInstance(materialInstance) | |
materialInstances -= materialInstance | |
} | |
fun destroy() { | |
loadingJobs.forEach { it.cancel() } | |
loadingJobs.clear() | |
materialInstances.toList().forEach { runCatching { destroyMaterialInstance(it) } } | |
materials.toList().forEach { runCatching { destroyMaterial(it) } } | |
_engine = null | |
_context = null | |
} | |
} |
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