/*

ahbejarano

Utility methods.

*/

package geetransit.minecraft05.engine;

import java.io.*;

import java.util.*;

import java.util.stream.*;

import java.util.function.*;

import java.nio.*;

import java.nio.charset.StandardCharsets;

import org.lwjgl.system.*;

import org.lwjgl.stb.*;

public class Utils {

public static InputStream loadInputStream(String file) throws Exception {

InputStream in = Utils.class.getResourceAsStream(file);

if (in == null)

throw new Exception("file [" + file + "] does not exist");

return in;

}

// source # https://stackoverflow.com/a/17861016

public static byte[] loadByteArray(String file) throws Exception {

try (

InputStream in = loadInputStream(file);

ByteArrayOutputStream out = new ByteArrayOutputStream();

) {

byte[] buffer = new byte[0xFFFF];

int len;

while ((len = in.read(buffer)) != -1)

out.write(buffer, 0, len);

return out.toByteArray();

}

}

public static String loadResource(String file) throws Exception {

try (

InputStream in = loadInputStream(file);

Scanner scanner = new Scanner(in, StandardCharsets.UTF_8.name());

) {

return scanner.useDelimiter("\\A").next();

}

}

public static Stream<String> loadLinesStream(String file) throws Exception {

// source # https://stackoverflow.com/a/30336423

InputStream in = loadInputStream(file);

InputStreamReader isr = new InputStreamReader(in, StandardCharsets.UTF_8.name());

return new BufferedReader(isr).lines();

}

public static ByteBuffer loadImage(String fileName, BiConsumer<Integer, Integer> consumer) throws Exception {

ByteBuffer imageBuffer;

ByteBuffer rawBuffer;

// Load Texture file

try (MemoryStack stack = MemoryStack.stackPush()) {

IntBuffer widthBuffer = stack.mallocInt(1);

IntBuffer heightBuffer = stack.mallocInt(1);

IntBuffer channelsBuffer = stack.mallocInt(1);

byte[] array = loadByteArray(fileName);

rawBuffer = MemoryUtil.memAlloc(array.length);

rawBuffer.put(array).flip();

imageBuffer = STBImage.stbi_load_from_memory(rawBuffer, widthBuffer, heightBuffer, channelsBuffer, 4);

if (imageBuffer == null)

throw new Exception("Image file [" + fileName + "] not loaded: " + STBImage.stbi_failure_reason());

// Get width and height of image

consumer.accept(widthBuffer.get(), heightBuffer.get());

}

return imageBuffer;

}

public static ByteBuffer loadImage(String fileName, int[] widthArray, int[] heightArray) throws Exception {

return loadImage(fileName, (width, height) -> { widthArray[0] = width; heightArray[0] = height; });

}

public static void freeImage(ByteBuffer imageBuffer) {

STBImage.stbi_image_free(imageBuffer);

}

public static int[] intListToArray(List<Integer> intList) {

return intList.stream().mapToInt(i -> i).toArray();

}

public static float[] floatListToArray(List<Float> floatList) {

float[] floatArray = new float[floatList.size()];

int i = 0;

for (float f : floatList)

floatArray[i++] = f;

return floatArray;

}

}