org.jtrfp.trcl.gpu.GLShader.java Source code

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Here is the source code for org.jtrfp.trcl.gpu.GLShader.java

Source

/*******************************************************************************
 * This file is part of TERMINAL RECALL
 * Copyright (c) 2012-2014 Chuck Ritola
 * Part of the jTRFP.org project
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     chuck - initial API and implementation
 ******************************************************************************/
package org.jtrfp.trcl.gpu;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.IntBuffer;
import java.nio.charset.Charset;

import javax.media.opengl.GL3;
import javax.media.opengl.GL4;

import org.apache.commons.io.IOUtils;

public abstract class GLShader {
    private final int shaderID;
    private final GPU gpu;

    GLShader(GPU gpu) {
        this.gpu = gpu;
        shaderID = gpu.getGl().glCreateShader(getShaderType());
        if (shaderID < 0)
            throw new RuntimeException("Invalid shader ID " + shaderID
                    + ". Something went wrong somewhere in putting the shader together.");
    }//end constructor

    protected abstract int getShaderType();

    public GLShader setSourceFromResource(String resourceURI) throws IOException {
        setSource(IOUtils.toString(getClass().getResourceAsStream(resourceURI)));
        return this;
    }// end setSourceFromResource(...)

    public void setSource(String source) {
        GL3 gl = gpu.getGl();
        gl.glShaderSource(shaderID, 1, new String[] { source }, (IntBuffer) null);
        gl.glCompileShader(shaderID);
        printStatusInfo(gl, shaderID);
    }// end setSource

    private void printStatusInfo(GL3 gl, int shaderID) {
        IntBuffer statBuf = IntBuffer.allocate(1);
        gl.glGetShaderiv(shaderID, GL4.GL_COMPILE_STATUS, statBuf);
        if (statBuf.get(0) == GL4.GL_FALSE) {
            statBuf.clear();
            gl.glGetShaderiv(shaderID, GL4.GL_INFO_LOG_LENGTH, statBuf);
            ByteBuffer log = ByteBuffer.allocate(statBuf.get(0));
            gl.glGetShaderInfoLog(shaderID, statBuf.get(0), null, log);
            System.out.println(Charset.forName("US-ASCII").decode(log).toString());
            System.exit(1);
        }
    }// end printStatusInfo(...)

    int getShaderID() {
        return shaderID;
    }
}//end GLShader