com.adavr.player.context.QuadContext.java Source code

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Here is the source code for com.adavr.player.context.QuadContext.java

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/*
 * Copyright (C) 2015 Shotaro Uchida <fantom@xmaker.mx>
 *
 * This program 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.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.adavr.player.context;

import java.nio.ByteBuffer;
import com.adavr.player.globjects.GLObject;
import com.adavr.player.globjects.VertexArray;
import com.adavr.player.globjects.VertexBuffer;
import com.adavr.player.globjects.Color;
import com.adavr.player.globjects.GLDataBuffer;
import com.adavr.player.globjects.TextureVertex;
import com.adavr.player.globjects.UV;
import com.adavr.player.globjects.Vertex;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL15;
import org.lwjgl.opengl.GL20;
import org.saintandreas.math.Vector3f;

/**
 *
 * @author Shotaro Uchida <fantom@xmaker.mx>
 */
public class QuadContext extends ModelRenderContext {

    private final float width;
    private final float height;
    private Vector3f offset;
    private TextureVertex[] vertices;
    private int indicesCount;
    private VertexArray vao;
    private VertexBuffer verticesVBO;
    private VertexBuffer indicesVBO;

    public QuadContext(float width, float height) {
        this.width = width;
        this.height = height;
        offset = Vector3f.ZERO;
    }

    public void setOffset(Vector3f offset) {
        this.offset = offset;
    }

    @Override
    public void setup() {
        final float w = width / 2f;
        final float h = height / 2f;
        vertices = new TextureVertex[] {
                new TextureVertex(-w + offset.x, h + offset.y, offset.z, 1f, new Color(1, 0, 0, 1), new UV(0, 0)),
                new TextureVertex(-w + offset.x, -h + offset.y, offset.z, 1f, new Color(0, 1, 0, 1), new UV(0, 1)),
                new TextureVertex(w + offset.x, -h + offset.y, offset.z, 1f, new Color(0, 0, 1, 1), new UV(1, 1)),
                new TextureVertex(w + offset.x, h + offset.y, offset.z, 1f, new Color(1, 1, 1, 1), new UV(1, 0)) };
        GLDataBuffer verticesBuffer = new GLDataBuffer(64);
        verticesBuffer.put(vertices);

        vao = VertexArray.create();
        VertexArray.bind(vao);
        {
            verticesVBO = VertexBuffer.create(GL15.GL_ARRAY_BUFFER);
            VertexBuffer.bind(verticesVBO);
            {
                verticesVBO.bufferData(verticesBuffer.getFlippedBuffer(), GL15.GL_STATIC_DRAW);
                int stride = Vertex.SIZE + Color.SIZE + UV.SIZE;
                vao.addAtrribute(Vertex.COUNT, stride);
                vao.addAtrribute(Color.COUNT, stride);
                vao.addAtrribute(UV.COUNT, stride);
            }
            VertexBuffer.unbind(verticesVBO);
        }
        VertexArray.unbind();

        ByteBuffer indicesBuffer = GLObject.setupByteBuffer(new byte[] { 0, 1, 2, 2, 3, 0 });
        indicesCount = indicesBuffer.limit();

        indicesVBO = VertexBuffer.create(GL15.GL_ELEMENT_ARRAY_BUFFER);
        VertexBuffer.bind(indicesVBO);
        {
            indicesVBO.bufferData(indicesBuffer, GL15.GL_STATIC_DRAW);
        }
        VertexBuffer.unbind(indicesVBO);
    }

    @Override
    public void loop() {
        VertexArray.bind(vao);
        {
            vao.enableAttributes();
            VertexBuffer.bind(indicesVBO);
            {
                GL11.glDrawElements(GL11.GL_TRIANGLES, indicesCount, GL11.GL_UNSIGNED_BYTE, 0);
            }
            VertexBuffer.unbind(indicesVBO);
            vao.disableAttributes();
        }
        VertexArray.unbind();
    }

    @Override
    public void destroy() {
        VertexArray.bind(vao);
        {
            GL20.glDisableVertexAttribArray(0);
            GL20.glDisableVertexAttribArray(1);

            VertexBuffer.unbind(verticesVBO);
            verticesVBO.destroy();
            VertexBuffer.unbind(indicesVBO);
            indicesVBO.destroy();
        }
        VertexArray.unbind();
        vao.destroy();
    }
}