com.grillecube.engine.opengl.object.GLShader.java Source code

Introduction

Here is the source code for com.grillecube.engine.opengl.object.GLShader.java

Source

/**
**   This file is part of the project https://github.com/toss-dev/VoxelEngine
**
**   License is available here: https://raw.githubusercontent.com/toss-dev/VoxelEngine/master/LICENSE.md
**
**   PEREIRA Romain
**                                       4-----7          
**                                      /|    /|
**                                     0-----3 |
**                                     | 5___|_6
**                                     |/    | /
**                                     1-----2
*/

package com.grillecube.engine.opengl.object;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;

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

import com.grillecube.engine.Logger;

public class GLShader implements GLObject {
    private int _id;

    public GLShader(int id) {
        this._id = id;
    }

    public static GLShader load(String filepath, int type) {
        GLShader shader = new GLShader(ShaderLoader.loadShader(filepath, type));
        return (shader);
    }

    public int getID() {
        return (this._id);
    }

    @Override
    public void delete() {
        GL20.glDeleteShader(this._id);
    }
}

class ShaderLoader {
    public static int loadShader(String filepath, int type) {
        Logger.get().log(Logger.Level.FINE, "Loading shader: " + filepath);

        try {
            String source = readFile(filepath);
            int shader_id = GL20.glCreateShader(type);
            GL20.glShaderSource(shader_id, source);
            GL20.glCompileShader(shader_id);
            if (GL20.glGetShaderi(shader_id, GL20.GL_COMPILE_STATUS) == GL11.GL_FALSE) {
                System.out.println(GL20.glGetShaderInfoLog(shader_id, 512));
                System.err.println("Couldnt compile shader: " + filepath);
                return (-1);
            }
            return (shader_id);
        } catch (IOException e) {
            System.out.println("couldnt read file: " + filepath);
            e.printStackTrace();
            return (-1);
        }
    }

    private static String readFile(String filepath) throws IOException {
        StringBuilder source = new StringBuilder();
        BufferedReader reader = new BufferedReader(new FileReader(filepath));
        String line;
        while ((line = reader.readLine()) != null) {
            if (line.trim().startsWith("#extern")) {
                String curdir = filepath.substring(0, filepath.lastIndexOf(File.separatorChar) + 1);
                String filename = line.substring(7).replaceAll(" ", "").replaceAll("'", "").replaceAll("\"", "");
                line = readFile(curdir + filename);
            }
            source.append(line).append("\n");
        }
        reader.close();
        return (source.toString());
    }
}