com.xrbpowered.gl.res.shaders.InstanceBuffer.java Source code

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Here is the source code for com.xrbpowered.gl.res.shaders.InstanceBuffer.java

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/*******************************************************************************
 * MIT License
 *
 * Copyright (c) 2016 Ashur Rafiev
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *******************************************************************************/
package com.xrbpowered.gl.res.shaders;

import java.nio.FloatBuffer;

import org.lwjgl.BufferUtils;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL15;
import org.lwjgl.opengl.GL20;
import org.lwjgl.opengl.GL33;

import com.xrbpowered.gl.Client;

public class InstanceBuffer {

    private FloatBuffer instanceBuffer = null;

    private int divisor;
    private int attribId;
    private int[] elemCount;
    private int stride;
    private int iboId;

    public InstanceBuffer(int divisor, int count, int attribId, int[] elemCount) {
        this.divisor = divisor;
        this.attribId = attribId;
        this.elemCount = elemCount;
        stride = 0;
        for (int i = 0; i < elemCount.length; i++) {
            stride += 4 * elemCount[i];
        }
        instanceBuffer = BufferUtils.createByteBuffer(count * stride).asFloatBuffer();

        iboId = GL15.glGenBuffers();
        GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, iboId);
        GL15.glBufferData(GL15.GL_ARRAY_BUFFER, count * stride, GL15.GL_STATIC_DRAW);
        GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
        Client.checkError();
    }

    public InstanceBuffer(int divisor, int count, int attribId, int elemCount) {
        this(divisor, count, attribId, new int[] { elemCount });
    }

    public static int bindAttribLocations(Shader shader, int startIndex, String[] names) {
        for (int i = 0; i < names.length; i++)
            GL20.glBindAttribLocation(shader.pId, i + startIndex, names[i]);
        return startIndex + names.length;
    }

    public void updateInstanceData(float[] instanceData, int count) {
        instanceBuffer.clear();
        instanceBuffer.put(instanceData, 0, count * stride / 4);
        instanceBuffer.flip();
        GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, iboId);
        GL15.glBufferSubData(GL15.GL_ARRAY_BUFFER, 0, instanceBuffer);
        GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
        Client.checkError();
    }

    public void enable() {
        int offs = 0;
        for (int i = 0; i < elemCount.length; i++) {
            GL20.glEnableVertexAttribArray(attribId + i);
            GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, iboId);
            GL20.glVertexAttribPointer(attribId + i, elemCount[i], GL11.GL_FLOAT, false, stride, offs);
            offs += 4 * elemCount[i];
            GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
            GL33.glVertexAttribDivisor(attribId + i, divisor);
            //         GL20.glGetVertexAttrib(attribId, GL33.GL_VERTEX_ATTRIB_ARRAY_DIVISOR, testParam);
            Client.checkError();
        }
    }

    public void disable() {
        for (int i = 0; i < elemCount.length; i++)
            GL20.glDisableVertexAttribArray(attribId + i);
        GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
    }

    public void destroy() {
        // TODO destroy InstanceBuffer
    }

}