com.opengrave.og.resources.TextureEditable.java Source code

Introduction

Here is the source code for com.opengrave.og.resources.TextureEditable.java

Source

/*
 * Copyright 2016 Nathan Howard
 * 
 * This file is part of OpenGrave
 * 
 * OpenGrave is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * OpenGrave is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with OpenGrave. If not, see <http://www.gnu.org/licenses/>.
 */
package com.opengrave.og.resources;

import java.nio.ByteBuffer;
import java.util.ArrayList;

import org.lwjgl.BufferUtils;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL12;
import org.lwjgl.opengl.GL13;

import com.opengrave.og.Util;
import com.opengrave.og.util.Vector4f;

public class TextureEditable implements Texture {

    int id = 0, size = 0;
    int lastTexNum = 0;
    ArrayList<TextureEditableDeferedChanges> changeList = new ArrayList<TextureEditableDeferedChanges>();
    ByteBuffer mainBuf;

    public void setColourAt(int x, int y, Vector4f col) {
        TextureEditableDeferedChanges newChange = new TextureEditableDeferedChanges(x, y, col);
        synchronized (changeList) {
            int index = changeList.indexOf(newChange);
            if (index != -1) {
                TextureEditableDeferedChanges a = changeList.get(index);
                a.setColour(col);
                return;
            }
            changeList.add(newChange);
        }
    }

    private static int getPowerOfTwo(int x) {
        if (x < 0) {
            return 0;
        }
        x--;
        x |= x >> 1;
        x |= x >> 2;
        x |= x >> 4;
        x |= x >> 8;
        x |= x >> 16;
        return x + 1;
    }

    public TextureEditable(int size, float r, float g, float b, float a) {

        this.size = getPowerOfTwo(size);
        id = GL11.glGenTextures();
        mainBuf = BufferUtils.createByteBuffer(4 * this.size * this.size);
        for (int count = 0; count < this.size * this.size; count++) {
            addColour(r, g, b, a);
        }
        mainBuf.flip();
        GL11.glBindTexture(GL11.GL_TEXTURE_2D, id);
        GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_RGBA, this.size, this.size, 0, GL12.GL_BGRA,
                GL11.GL_UNSIGNED_BYTE, mainBuf);
        GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_S, GL11.GL_REPEAT);
        GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_T, GL11.GL_REPEAT);
        GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_LINEAR);
        GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_LINEAR);
        GL11.glBindTexture(GL11.GL_TEXTURE_2D, 0);
    }

    @Override
    public int getTextureType() {
        return GL11.GL_TEXTURE_2D;
    }

    public void applyChangeToMainBuffer(TextureEditableDeferedChanges change) {
        mainBuf.position((change.getX() + change.getY() * size) * 4);
        addColour(change.getColour());
        mainBuf.position(0);
    }

    private void addColour(Vector4f colour) {
        addColour(colour.x, colour.y, colour.z, colour.w);
    }

    public void addColour(float r, float g, float b, float a) {
        mainBuf.put((byte) (255 * b)).put((byte) (255 * g)).put((byte) (255 * r)).put((byte) (255 * a));
    }

    @Override
    public void bind(int t) {
        GL13.glActiveTexture(t);
        synchronized (changeList) {
            if (changeList.size() < 10) {
                GL11.glBindTexture(GL11.GL_TEXTURE_2D, id);

                for (TextureEditableDeferedChanges change : changeList) {
                    applyChangeToMainBuffer(change);
                    ByteBuffer buf = BufferUtils.createByteBuffer(4);
                    buf.put((byte) (255 * change.getColour().z)).put((byte) (255 * change.getColour().y))
                            .put((byte) (255 * change.getColour().x)).put((byte) (255 * change.getColour().w));
                    buf.flip();
                    GL11.glTexSubImage2D(GL11.GL_TEXTURE_2D, 0, change.getX(), change.getY(), 1, 1, GL12.GL_BGRA,
                            GL11.GL_UNSIGNED_BYTE, buf);
                }
                GL11.glBindTexture(GL11.GL_TEXTURE_2D, 0);
            } else {
                // Replace the whole image. There's bound to be better ways
                // around this...
                for (TextureEditableDeferedChanges change : changeList) {
                    applyChangeToMainBuffer(change);
                }
                mainBuf.position(0);
                GL11.glBindTexture(GL11.GL_TEXTURE_2D, id);
                Util.checkErr();
                GL11.glTexSubImage2D(GL11.GL_TEXTURE_2D, 0, 0, 0, size, size, GL12.GL_BGRA, GL11.GL_UNSIGNED_BYTE,
                        mainBuf);
                Util.checkErr();
                GL11.glBindTexture(GL11.GL_TEXTURE_2D, 0);
                Util.checkErr();

            }
            changeList.clear();
        }
        Util.checkErr();
        GL11.glBindTexture(GL11.GL_TEXTURE_2D, id);
        lastTexNum = t;
    }

    @Override
    public void unbind() {
        GL13.glActiveTexture(lastTexNum);
        GL11.glBindTexture(GL11.GL_TEXTURE_2D, 0);
    }

    @Override
    public boolean isValid() {
        return true;
    }

    public int getTextureInt() {
        return id;
    }

    public Vector4f getColourAt(int x, int y) {
        Vector4f col = new Vector4f();
        mainBuf.position((x + y * size) * 4);
        col.x = mainBuf.get();
        col.y = mainBuf.get();
        col.z = mainBuf.get();
        col.w = mainBuf.get();
        synchronized (changeList) {
            for (TextureEditableDeferedChanges change : changeList) {
                if (change.getX() == x && change.getY() == y) {
                    col = change.getColour();
                }
            }
        }
        return col;

    }

    public void dumpChanges(ArrayList<TextureEditableDeferedChanges> colChange) {
        synchronized (changeList) {
            changeList.addAll(colChange);
        }
    }

}