/*

ahbejarano

Texture helper class.

*/

package geetransit.minecraft05.engine;

import java.nio.*;

import static org.lwjgl.opengl.GL30.*;

import static org.lwjgl.system.MemoryUtil.*;

public class Texture {

private int id;

private int width;

private int length;

public Texture(String fileName) throws Exception {

this.loadTexture(fileName);

}

public Texture(int id, int width, int length) throws Exception {

this.id = id;

this.width = width;

this.length = length;

}

public int getId() { return this.id; }

public int getWidth() { return this.width; }

public int getLength() { return this.length; }

public void bind() {

glBindTexture(GL_TEXTURE_2D, this.id);

}

public void prepare() {

glActiveTexture(GL_TEXTURE0);

this.bind();

}

public void cleanup() {

glDeleteTextures(this.id);

}

private void loadTexture(String fileName) throws Exception {

ByteBuffer image = Utils.loadImage(fileName, (w, l) -> { this.width = w; this.length = l; });

// Create a new OpenGL texture

int textureId = glGenTextures();

// Bind the texture

glBindTexture(GL_TEXTURE_2D, textureId);

// Tell OpenGL how to unpack the RGBA bytes. Each component is 1 byte size

glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

// make text easier to read

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

// Upload the texture data

glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, this.width, this.length, 0, GL_RGBA, GL_UNSIGNED_BYTE, image);

// Generate Mip Map

glGenerateMipmap(GL_TEXTURE_2D);

Utils.freeImage(image);

this.id = textureId;

}

}