com.opengrave.og.base.RenderableLines.java Source code

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Here is the source code for com.opengrave.og.base.RenderableLines.java

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/*
 * 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.base;

import java.nio.FloatBuffer;
import java.util.ArrayList;

import org.lwjgl.BufferUtils;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL15;
import org.lwjgl.opengl.GL20;
import org.lwjgl.opengl.GL30;

import com.opengrave.common.pathing.PathNode;
import com.opengrave.common.pathing.PathProgress;
import com.opengrave.og.Util;
import com.opengrave.og.engine.Location;
import com.opengrave.og.light.Shadow;
import com.opengrave.og.resources.RenderStyle;
import com.opengrave.og.resources.Resources;
import com.opengrave.og.terrain.TerrainWorld;
import com.opengrave.og.util.Matrix4f;

public class RenderableLines extends Renderable {

    public boolean visible = true;
    ArrayList<VertexPoint> vertexList = new ArrayList<VertexPoint>();
    private int vaoID;
    private int vboID, vbocID;
    private FloatBuffer posBuffer, colBuffer;
    public Matrix4f matrix;
    private int vertCount;

    public void setFromPath(PathProgress path, TerrainWorld world) {
        vertexList.clear();
        PathNode lastNode = null;
        for (PathNode node : path.getAll()) {
            if (lastNode != null) {
                Location lastNodeLoc = new Location();
                lastNodeLoc.set(lastNode);
                Location nodeLoc = new Location();
                nodeLoc.set(node);
                float z1 = world.getHeightAt(lastNodeLoc);
                float z2 = world.getHeightAt(nodeLoc);
                addVertex(new VertexPoint(lastNode.getX() / 2f, lastNode.getY() / 2f, z1, 0f, 0f, 1f, 1f, 0f, 0f));
                addVertex(new VertexPoint(node.getX() / 2f, node.getY() / 2f, z2, 0f, 0f, 1f, 1f, 0f, 0f));
            }
            lastNode = node;
        }
        setChanged();
    }

    @Override
    public void renderShadows(Matrix4f matrix, Shadow shadow) {
        // non-world items, no shadow
    }

    @Override
    public void render(Matrix4f matrix, RenderStyle style) {
        dealWithChange();
        if (!visible) {
            return;
        }
        if (vertCount == 0) {
            return;
        }
        GL11.glPointSize(3f);

        int pID = Resources.loadShader("lines.vs", "lines.fs").getProgram();
        GL20.glUseProgram(pID);
        if (pID == 0) {
            return;
        }
        GL30.glBindVertexArray(vaoID);
        GL20.glEnableVertexAttribArray(0);
        GL20.glEnableVertexAttribArray(1);

        Util.checkErr();

        getContext().setMatrices(pID, matrix);
        Util.checkErr();
        GL11.glDisable(GL11.GL_DEPTH_TEST);
        GL11.glDrawArrays(GL11.GL_LINES, 0, vertCount);
        GL11.glEnable(GL11.GL_DEPTH_TEST);
        Util.checkErr();
        GL20.glDisableVertexAttribArray(1);
        GL20.glDisableVertexAttribArray(0);
        Util.checkErr();

        GL30.glBindVertexArray(0);
        GL20.glUseProgram(0);
        GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
        GL30.glBindVertexArray(0);
        Util.checkErr();

    }

    @Override
    public void renderForPicking(Matrix4f matrix, Pickable object) {
    }

    @Override
    public void dealWithChange() {
        if (vaoID == 0) {
            vaoID = GL30.glGenVertexArrays();
        }
        GL30.glBindVertexArray(vaoID);
        if (vboID == 0) {
            vboID = GL15.glGenBuffers();
        }
        if (vbocID == 0) {
            vbocID = GL15.glGenBuffers();
        }

        if (changed) {
            changed = false;
            recreate();
            vertCount = vertexList.size();
            if ((vertCount & 1) == 1) { // Dirty fix for odd numbers
                vertCount = 0;
                return;
            }
            if (vertCount == 0) {
                return;
            }
            if (posBuffer == null || posBuffer.capacity() != vertCount * 3) {
                posBuffer = BufferUtils.createFloatBuffer(vertCount * 3);
            }
            if (colBuffer == null || colBuffer.capacity() != vertCount * 4) {
                colBuffer = BufferUtils.createFloatBuffer(vertCount * 4);
            }
            for (VertexPoint va : vertexList) {
                posBuffer.put(va.x).put(va.y).put(va.z);
                colBuffer.put(va.r).put(va.g).put(va.b).put(va.a);
            }
            posBuffer.flip();
            colBuffer.flip();

            GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, vboID);
            GL15.glBufferData(GL15.GL_ARRAY_BUFFER, posBuffer, GL15.GL_STATIC_DRAW);
            GL20.glVertexAttribPointer(0, 3, GL11.GL_FLOAT, false, 0, 0);

            GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, vbocID);
            GL15.glBufferData(GL15.GL_ARRAY_BUFFER, colBuffer, GL15.GL_STATIC_DRAW);
            GL20.glVertexAttribPointer(1, 4, GL11.GL_FLOAT, false, 0, 0);
            GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);

        }
        GL30.glBindVertexArray(0);
    }

    @Override
    public void addVertex(VertexData vd) {
        if (vd instanceof VertexPoint) {
            vertexList.add((VertexPoint) vd);
            changed = true;
        }
    }

    @Override
    public void recreate() {
    }

    @Override
    public void update(float delta) {

    }

    @Override
    public void delete() {

    }

    public void clearLines() {
        vertexList.clear();
    }

}