package com.io7m.bugs;

import java.nio.IntBuffer;

import javax.media.opengl.GL;
import javax.media.opengl.GL2GL3;
import javax.media.opengl.GL3;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLCapabilities;
import javax.media.opengl.GLContext;
import javax.media.opengl.GLEventListener;
import javax.media.opengl.GLProfile;

import org.junit.Assert;
import org.junit.Assume;
import org.junit.Test;

import com.jogamp.common.nio.Buffers;
import com.jogamp.newt.opengl.GLWindow;

/**
 * The 3.1 context on Mesa 9.0.1 seems to be broken.
 */

public final class TestBuggyMesa901
{
  /**
   * The glPolygonMode() call raises GL_INVALID_ENUM on buggy Mesa 9.0.1 3.1
   * contexts.
   */

  @SuppressWarnings("static-method") @Test public
    void
    testPolygonModeFailure()
  {
    final GLProfile pro = GLProfile.get(GLProfile.GL3);
    final GLCapabilities caps = new GLCapabilities(pro);
    final GLWindow window = GLWindow.create(caps);

    window.setSize(640, 480);
    window.addGLEventListener(new GLEventListener() {
      public void reshape(
        final GLAutoDrawable drawable,
        final int x,
        final int y,
        final int width,
        final int height)
      {
        // Nothing.
      }

      public void init(
        final GLAutoDrawable drawable)
      {
        final GLContext context = drawable.getContext();
        Assume.assumeTrue(context.getGLVersionMajor() >= 3);
        Assume.assumeTrue(context.getGLVersionMinor() >= 1);

        final GL3 gl = drawable.getGL().getGL3();
        gl.glPolygonMode(GL.GL_FRONT, GL2GL3.GL_FILL);

        final int e = gl.glGetError();
        Assert.assertTrue(e == GL.GL_INVALID_ENUM);
      }

      public void dispose(
        final GLAutoDrawable drawable)
      {
        // Nothing.
      }

      public void display(
        final GLAutoDrawable drawable)
      {
        // Nothing.
      }
    });

    window.setVisible(true);
    window.destroy();
  }

  /**
   * Binding a VBO attribute fails. It raises GL_INVALID_OPERATION despite
   * being entirely valid according to the documentation. The same call works
   * correctly in the 3.0 context.
   */

  @SuppressWarnings("static-method") @Test public
    void
    testBindArrayAttributeFails()
  {
    final GLProfile pro = GLProfile.get(GLProfile.GL3);
    final GLCapabilities caps = new GLCapabilities(pro);
    final GLWindow window = GLWindow.create(caps);

    window.setSize(640, 480);
    window.addGLEventListener(new GLEventListener() {
      public void reshape(
        final GLAutoDrawable drawable,
        final int x,
        final int y,
        final int width,
        final int height)
      {
        // Nothing.
      }

      public void init(
        final GLAutoDrawable drawable)
      {
        final GLContext context = drawable.getContext();
        Assume.assumeTrue(context.getGLVersionMajor() >= 3);
        Assume.assumeTrue(context.getGLVersionMinor() >= 1);

        final GL3 gl = drawable.getGL().getGL3();

        final IntBuffer buffers = Buffers.newDirectIntBuffer(1);
        gl.glGenBuffers(1, buffers);
        Assert.assertTrue(gl.glGetError() == 0);

        final int name = buffers.get(0);
        gl.glBindBuffer(GL.GL_ARRAY_BUFFER, name);
        Assert.assertTrue(gl.glGetError() == 0);
        gl.glBufferData(GL.GL_ARRAY_BUFFER, 4 * 32, null, GL.GL_STATIC_DRAW);
        Assert.assertTrue(gl.glGetError() == 0);

        Assert.assertTrue(gl.glGetBoundBuffer(GL.GL_ARRAY_BUFFER) == name);
        gl.glEnableVertexAttribArray(1);
        Assert.assertTrue(gl.glGetError() == 0);
        gl.glVertexAttribPointer(1, 4, GL.GL_FLOAT, false, 0, 0L);
        Assert.assertTrue(gl.glGetError() == GL.GL_INVALID_OPERATION);
      }

      public void dispose(
        final GLAutoDrawable drawable)
      {
        // Nothing.
      }

      public void display(
        final GLAutoDrawable drawable)
      {
        // Nothing.
      }
    });

    window.setVisible(true);
    window.destroy();
  }
}