Class TextureArray

src/main/java/field/graphics/TextureArray.kt:17–137

* This is a brief partial attempt to write a texture array, designed, currently, to */

 * This is a brief partial attempt to write a texture array, designed, currently, to
 */
class TextureArray(var unit: Int, val w: Int, val h: Int, val d: Int, val source: ByteBuffer) : BaseScene<TextureArray.State>(), Perform, OffersUniform<Int> {
    inner class State : Modifiable() {
        var name = -1
    }

    override fun perform0(): Boolean {
        val s: TextureArray.State = GraphicsContext.get(this)
        GL13.glActiveTexture(GL13.GL_TEXTURE0 + unit)
        GL11.glBindTexture(GL_TEXTURE_2D_ARRAY, s.name)
        return true
    }

    override fun setup(): State {
        val s: TextureArray.State = State()
        s.name = GL11.glGenTextures()
        GL13.glActiveTexture(GL13.GL_TEXTURE0 + unit)
        GL11.glBindTexture(GL_TEXTURE_2D_ARRAY, s.name)

        GL11.glTexParameteri(GL_TEXTURE_2D_ARRAY, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_LINEAR)
        GL11.glTexParameteri(GL_TEXTURE_2D_ARRAY, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_LINEAR)
        GL11.glTexParameteri(GL_TEXTURE_2D_ARRAY, GL11.GL_TEXTURE_WRAP_S, GL12.GL_CLAMP_TO_EDGE)
        GL11.glTexParameteri(GL_TEXTURE_2D_ARRAY, GL11.GL_TEXTURE_WRAP_T, GL12.GL_CLAMP_TO_EDGE)

        GL11.glPixelStorei(GL11.GL_UNPACK_ALIGNMENT, 1)
        GL11.glPixelStorei(GL11.GL_UNPACK_ROW_LENGTH, w);

        ARBTextureStorage.glTexStorage3D(GL_TEXTURE_2D_ARRAY, 1, GL11.GL_RGBA8, w, h, d)
        glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0, 0, 0, 0, w, h, d, GL11.GL_RGB, GL11.GL_UNSIGNED_BYTE, source)

        return s
    }

    override fun getPasses(): IntArray {
        return intArrayOf(-1)
    }

    override fun deallocate(s: State) {
        GL11.glDeleteTextures(s!!.name)
    }

    override fun getUniform(): Int {
        return unit
    }

    companion object {

        @JvmStatic
        val dirCache = HashMap<String, TextureArray?>()

        @JvmStatic
        @JvmOverloads
        // because of the way that this rewrites the unit of a, potentially already loaded, texture list this isn't very useful outside of the context of Trace
        fun fromDirectory(unit: Int, fn: String, maxNum: Int = -1, loadEvery: Int = 1): TextureArray? {

            val uu = dirCache.computeIfAbsent(fn + " " + maxNum) {
                var jj = File(fn).listFiles(FilenameFilter { dir, name ->
                    name.endsWith(".jpg") && !name.startsWith(".")
                }) ?: return@computeIfAbsent null