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

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Here is the source code for com.xrbpowered.gl.res.shaders.VertexInfo.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.util.ArrayList;
import java.util.List;

import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL20;

public class VertexInfo {

    public static class Attribute {
        public final String name;
        public final int elemCount;
        public final int offset;

        public Attribute(String name, int elemCount, int offset) {
            this.name = name;
            this.elemCount = elemCount;
            this.offset = offset;
        }
    }

    private int skip = 0;
    private List<Attribute> attribs = new ArrayList<>();

    public VertexInfo addAttrib(String name, int elemCount) {
        this.attribs.add(new Attribute(name, elemCount, skip));
        skip += elemCount;
        return this;
    }

    public int getStride() {
        return skip * 4;
    }

    public int getSkip() {
        return skip;
    }

    public int getAttributeCount() {
        return attribs.size();
    }

    public Attribute get(int index) {
        return attribs.get(index);
    }

    public int attributeIndex(String name) {
        if (name == null)
            return -1;
        for (int i = 0; i < getAttributeCount(); i++) {
            Attribute a = attribs.get(i);
            if (a.name != null && name.equals(a.name))
                return i;
        }
        return -1;
    }

    public Attribute get(String name) {
        int index = attributeIndex(name);
        if (index < 0)
            return null;
        else
            return get(index);
    }

    public void initAttribPointers() {
        for (int i = 0; i < getAttributeCount(); i++) {
            Attribute a = attribs.get(i);
            GL20.glVertexAttribPointer(i, a.elemCount, GL11.GL_FLOAT, false, getStride(), a.offset * 4);
        }
    }

    public void enableAttribs() {
        for (int i = 0; i < getAttributeCount(); i++) {
            GL20.glEnableVertexAttribArray(i);
        }
    }

    public void disableAttribs() {
        for (int i = 0; i < getAttributeCount(); i++) {
            GL20.glDisableVertexAttribArray(i);
        }
    }

    public int bindAttribLocations(int programId) {
        for (int i = 0; i < getAttributeCount(); i++) {
            Attribute a = attribs.get(i);
            if (a.name != null)
                GL20.glBindAttribLocation(programId, i, a.name);
        }
        return getAttributeCount();
    }

}