private int initVAO(GL3 gl) {
int[] buff = new int[1];
gl.glGenVertexArrays(1, buff, 0);
int vao = buff[0];
Assert.assertTrue("Invalid VAO: " + vao, vao > 0);
gl.glUseProgram(progID);
final int posLoc = gl.glGetAttribLocation(progID, "vPosition");
final int colorLoc = gl.glGetAttribLocation(progID, "vColor");
gl.glUseProgram(0);
gl.glBindVertexArray(vao);
gl.glBindBuffer(GL3.GL_ARRAY_BUFFER, vbo);
gl.glBindBuffer(GL3.GL_ELEMENT_ARRAY_BUFFER, ibo);
gl.glEnableVertexAttribArray(posLoc);
gl.glEnableVertexAttribArray(colorLoc);
final int stride = 6 * Buffers.SIZEOF_FLOAT;
final int cOff = 3 * Buffers.SIZEOF_FLOAT;
gl.glVertexAttribPointer(posLoc, 3, GL3.GL_FLOAT, false, stride, 0L);
gl.glVertexAttribPointer(colorLoc, 3, GL3.GL_FLOAT, false, stride, cOff);
gl.glBindVertexArray(0);
// See class documentation above!
gl.glBindBuffer(GL3.GL_ARRAY_BUFFER, 0);
gl.glBindBuffer(GL3.GL_ELEMENT_ARRAY_BUFFER, 0);
return vao;
}
/**
* Activate and use a given shader.
*
* @param s the shader to be activated
*/
@Override
public void useShader(Shader s) {
if (s != null) {
activeShaderID = ((GLShader) s).programId();
gl.glUseProgram(activeShaderID);
}
}
/** This method is called at the beginning of each frame, i.e., before scene drawing starts. */
private void beginFrame() {
// Set the active shader as default for this frame
gl.glUseProgram(activeShaderID);
// Clear color and depth buffer for the new frame
gl.glClear(GL3.GL_COLOR_BUFFER_BIT);
gl.glClear(GL3.GL_DEPTH_BUFFER_BIT);
}