com.auroraengine.opengl.shaders.GLProgram.java Source code

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Here is the source code for com.auroraengine.opengl.shaders.GLProgram.java

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/*
 * Copyright (C) 2017 LittleRover
 *
 * 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.auroraengine.opengl.shaders;

import com.auroraengine.client.ClientException;
import com.auroraengine.data.Client;
import com.auroraengine.debug.AuroraLogs;
import com.auroraengine.opengl.GLException;
import com.auroraengine.opengl.GLSharedObject;
import com.auroraengine.opengl.GLVersion;
import java.util.logging.Logger;
import org.lwjgl.opengl.GL20;

/**
 * An object which describes a shader program. Currently not made.
 */
@Client
@GLVersion(version = 20)
public class GLProgram extends GLSharedObject {
    private static final Logger LOG = AuroraLogs.getLogger(GLProgram.class.getName());

    public GLProgram(GLShader p_vertex, GLShader p_fragment) throws ClientException {
        if (p_vertex.type != ShaderType.VERTEX) {
            throw new ClientException("Invalid Shader: Expected VERTEX, got " + p_vertex.type.name());
        }
        if (p_fragment.type != ShaderType.FRAGMENT) {
            throw new ClientException("Invalid Shader: Expected FRAGMENT, got " + p_fragment.type.name());
        }
        this.vertex = p_vertex;
        this.fragment = p_fragment;
    }

    private GLShader fragment;
    private int index = 0;
    private boolean loaded = false;
    private GLShader vertex;

    @Override
    public void forceCreate() throws GLException {
        if (index != 0) {
            index = GL20.glCreateProgram();
            if (index == 0) {
                throw new GLException("Couldn't create program object.");
            }
            try {
                vertex.create(this);
                fragment.create(this);
            } catch (GLException ex) {
                GL20.glDeleteProgram(index);
                throw ex;
            }
            GL20.glAttachShader(index, vertex.index);
            GL20.glAttachShader(index, fragment.index);
            GLException.checkGL("Attaching Shaders");
            // glBindAttribLocation
            GL20.glLinkProgram(index);
            GLException.checkGL("Linking Program");
        }
    }

    @Override
    public void forceDestroy() {
        if (index != 0) {
            GL20.glDetachShader(index, vertex.index);
            GL20.glDetachShader(index, fragment.index);
            vertex.destroy(this);
            fragment.destroy(this);
            GL20.glDeleteProgram(index);
        }
    }

    @Override
    public void forceLoad() throws ClientException {
        if (!loaded) {
            vertex.load(this);
            fragment.load(this);
            loaded = true;
        }
    }

    @Override
    public void forceUnload() throws ClientException {
        if (loaded) {
            vertex.unload(this);
            fragment.unload(this);
            loaded = false;
        }
    }

    @Override
    public boolean isCreated() {
        return index != 0;
    }

    @Override
    public boolean isLoaded() {
        return loaded;
    }

    /**
     * Sets this program as being currently in use.
     *
     * Note that this may not be the best way of using this.
     *
     * @throws GLException
     */
    @Override
    public void update() throws GLException {
        GL20.glUseProgram(index);
    }
}