Shader

public class Shader {

    public Shader() {
    program = GL20.glCreateProgram();
    uniforms = new HashMap<String, Integer>();
    }

    private int program;
    private HashMap<String, Integer> uniforms;

    public void addVertexShader(String fileName) {
    addShader(ShaderLoader.loadShader(fileName), GL20.GL_VERTEX_SHADER);
    }

    public void addFragmentShader(String fileName) {
    addShader(ShaderLoader.loadShader(fileName), GL20.GL_FRAGMENT_SHADER);
    }

    private void addShader(String code, int shaderType) {
    int shader = GL20.glCreateShader(shaderType);
    GL20.glShaderSource(shader, code);
    GL20.glCompileShader(shader);
    GL20.glAttachShader(program, shader);

    String infoLog = GL20.glGetShaderInfoLog(shader, GL20.glGetShaderi(shader, GL20.GL_INFO_LOG_LENGTH));

    if(!infoLog.equals("")){
        System.out.println(infoLog);
    }

    }

    public void compile() {
    linkProgram();
    validateProgram();
    }

    public void validateProgram() {
    GL20.glValidateProgram(program);
    }

    public void linkProgram() {
    GL20.glLinkProgram(program);
    }

    public void useProgram() {
    GL20.glUseProgram(program);
    }

    public void delselectProgram(){
    GL20.glUseProgram(0);
    }

    public void destroyProgram() {
    GL20.glDeleteProgram(program);
    }

    public void addUniform(String uniform) {
    uniforms.put(uniform, GL20.glGetUniformLocation(program, uniform));
    }

    public void setUniformi(String uniform, int i) {
    int location = uniforms.get(uniform);
    GL20.glUniform1i(location, i);
    }

    public void setUniformf(String uniform, float f) {
    int location = uniforms.get(uniform);
    GL20.glUniform1f(location, f);
    }

    public void setUniform(String uniform, Vector2f vec) {
    int location = uniforms.get(uniform);
    GL20.glUniform2f(location, vec.getX(), vec.getY());
    }

    public void setUniformMatrix3(String name, Matrix3f matrix) {
    GL20.glUniformMatrix3(uniforms.get(name), true, Util.createFlippedBuffer(matrix));
    }

    public void setUniformMatrix4(String name, Matrix4f matrix){
    GL20.glUniformMatrix3(uniforms.get(name), true, Util.createFlippedBuffer(matrix));
    }

    private String getName(int shaderType) {
    if (shaderType == GL20.GL_VERTEX_SHADER) {
        return "GL_VERTEX_SHADER";
    } else if (shaderType == GL20.GL_FRAGMENT_SHADER) {
        return "GL_FRAGMENT_SHADER";
    } else {
        return "UNKNOWN_SHADER";
    }
    }

    public int getProgram() {
    return program;
    }

}