lwjgl Update VBO (color, vertices) through JSlider - lwjgl

Question

sorry for my bad english.
I have a problem upadting a VBO through a JSlider and the stateChanged-Event. In general i want to figure it out by myself but i am stuck at the moment. so my first question is how to manipulate (update) the vbo when the following code was given:
public void update(){
farbe = (float)slider_c.getValue()/100f;
// x = (float)slider_x.getValue()/100f;
// y = (float)slider_y.getValue()/100f;
}
public float[] getPosition()
{
return new float[]{x,y};
}
/* Run Methode: window is started here
* Definition of frame loop
*/
public void run() {
try{
initWindow();
GL.createCapabilities();
initBuffers();
initShaders();
// Game Loop
while (glfwWindowShouldClose(window) == GL_FALSE) {
// initBuffers();
frame();
glfwSwapBuffers(window);
glfwPollEvents();
}
}
finally {
// Clean up
glfwTerminate();
errorCallback.release();
glDeleteProgram(program);
System.exit(0);
}
}
private void frame() {
glClearColor(1.0f, 0.0f, 0.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glBindVertexArray(vao);
glDrawArrays(GL_TRIANGLES, 0, 3);
}
private void initBuffers() {
// from the secound one
if (vao > -1) {
glDeleteBuffers(vao);
glDeleteVertexArrays(vboPosition);
glDeleteVertexArrays(vboColor);
}
vao = glGenVertexArrays();
glBindVertexArray(vao);
vboPosition = glGenBuffers();
// x y z w
float[] positions2 = new float[]{
0.5f, 0.0f, 0.0f, 1.0f, // 1. Point
0.0f, 0.5f, 0.0f, 1.0f, // 2. Point
0.0f, 0.0f, 0.5f, 1.0f
};
FloatBuffer dataBuffer = BufferUtils.createFloatBuffer(positions2.length);
dataBuffer.put(positions2);
dataBuffer.flip();
glBindBuffer(GL_ARRAY_BUFFER, vboPosition);
// alloctate memory on the graphics card and upload bytes to it
glBufferData(GL_ARRAY_BUFFER, dataBuffer, GL_STATIC_DRAW);
GLUtil.checkGLError();
glEnableVertexAttribArray(0); // Position is index 0
glVertexAttribPointer(0, 4, GL_FLOAT, false, 0, 0L);
GLUtil.checkGLError();
vboColor = glGenBuffers();
// x y z w
float[] colors = new float[]{
1f, 0f, 0f, 1f, // P1 = red
0f, 1f, 0f, 1f, // green
0f, 0f, 1f, 1f, // blue
};
dataBuffer = BufferUtils.createFloatBuffer(colors.length);
dataBuffer.put(colors);
dataBuffer.flip();
glBindBuffer(GL_ARRAY_BUFFER, vboColor);
glBufferData(GL_ARRAY_BUFFER, dataBuffer, GL_STATIC_DRAW);
GLUtil.checkGLError();
glEnableVertexAttribArray(1); // COLOR is index 1
glVertexAttribPointer(1, 4, GL_FLOAT, false, 0, 0L);
GLUtil.checkGLError();
}
private void initWindow() {
System.out.println("LWJGL version: " + Version.getVersion());
glfwSetErrorCallback(errorCallback = GLFWErrorCallback
.createPrint(System.err));
if (glfwInit() != GL_TRUE)
throw new IllegalStateException("Unable to initialize GLFW");
glfwDefaultWindowHints();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
// glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_ANY_PROFILE);
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
window = glfwCreateWindow(WIDTH, HEIGHT, "Demo", NULL, NULL);
if (window == NULL)
throw new RuntimeException("Failed to create the GLFW window");
glfwMakeContextCurrent(window);
glfwSwapInterval(1);
glfwShowWindow(window);
}
I hope someone can help me out with that. if you need more information - i am keeping an eye on this post and will reply immediately.
best regards

Answer 1

private void updateColors() {
float[] newColors = new float[]{
newColor, 0f, 0f, 1f, // P1 = red
0f, 1f, 0f, 1f, // green
0f, 0f, 1f, 1f, // blue
};
FloatBuffer dataBuffer = BufferUtils.createFloatBuffer(newColors.length);
dataBuffer.put(newColors);
dataBuffer.flip();
glBindBuffer(GL_ARRAY_BUFFER, vboColor);
// alloctate memory on the graphics card and upload bytes to it
glBufferData(GL_ARRAY_BUFFER, dataBuffer, GL_STATIC_DRAW);
glEnableVertexAttribArray(1); // Color at index 1
}
I solved it by using the method seen above within the while loop (the frame loop).