Posted by nyholku on Nov 26, 2017; 6:11pm
URL: https://forum.jogamp.org/unpack-pixel-buffer-object-must-be-bound-to-call-this-method-tp4038328.html

I get this error:

<code><pre>
javax.media.opengl.GLException: unpack pixel_buffer_object must be bound to call this method
        at jogamp.opengl.gl4.GL4bcImpl.checkBufferObject(GL4bcImpl.java:37213)
        at jogamp.opengl.gl4.GL4bcImpl.checkUnpackPBOBound(GL4bcImpl.java:37299)
        at jogamp.opengl.gl4.GL4bcImpl.glTexImage2D(GL4bcImpl.java:27291)
</pre></code>

from code below. Actually the title of this post is misleading, what I'm looking for<br>
is instructions or better yet a working example how to render a BufferedImage<br>
using OpenGL 2 ES. My ultimate goal is to render some 2D text which I plan to<br>
do by rendering it first to a BI and then rendering a rectangle with the texture<br>
mapping.<br>
<p>
I've been up and down the information highway and have not seen an example<br>
that would allow me to us a BI as texture. Lots of info here and there but I<br>
can't make it work. The code below is just one attempt out of dozens I've tried.<br>

wbr Kusti
<p>
<code><pre>
                BufferedImage img = new BufferedImage(128, 128, BufferedImage.TYPE_INT_ARGB);
                Graphics2D g = (Graphics2D) img.getGraphics();
                g.setColor(Color.red);
                g.fillRect(0, 0, 128, 128);
                g.setColor(Color.green);
                g.fillOval(0, 0, 128, 128);
                Texture tex = AWTTextureIO.newTexture(GLProfile.getDefault(), img, true);

                gl.glLoadIdentity();

                gl.glMatrixMode(GL.GL_PROJECTION);
                gl.glLoadIdentity();

                ByteBuffer vbb = ByteBuffer.allocateDirect(4 * 3 * Float.BYTES);
                vbb.order(ByteOrder.nativeOrder());
                FloatBuffer m_VertexBuffer = vbb.asFloatBuffer();
                m_VertexBuffer.position(0);
                m_VertexBuffer.put(new float[] { -1, -1, 0 });
                m_VertexBuffer.put(new float[] { +1, -1, 0 });
                m_VertexBuffer.put(new float[] { +1, +1, 0 });
                m_VertexBuffer.put(new float[] { -1, +1, 0 });

                ByteBuffer tbb = ByteBuffer.allocateDirect(4 * 2 * Float.BYTES);
                tbb.order(ByteOrder.nativeOrder());
                FloatBuffer m_TextureCoordBuffer = tbb.asFloatBuffer();
                m_TextureCoordBuffer.position(0);
                m_TextureCoordBuffer.put(new float[] { 0, 0 });
                m_TextureCoordBuffer.put(new float[] { 1, 0 });
                m_TextureCoordBuffer.put(new float[] { 1, 1 });
                m_TextureCoordBuffer.put(new float[] { 0, 1 });

                m_VertexBuffer.position(0);
                m_TextureCoordBuffer.position(0);

                gl.glTexParameteri(GL2.GL_TEXTURE_2D, GL2.GL_TEXTURE_MIN_FILTER, GL2.GL_LINEAR);
                gl.glTexImage2D(GL2.GL_TEXTURE_2D, 0, GL2.GL_RGBA, 128, 128, 0, GL2.GL_RGBA, GL2.GL_UNSIGNED_BYTE, tex.getTextureObject());

                gl.glColor3f(1.0f, 0, 0);
                gl.glEnableClientState(GL2.GL_VERTEX_ARRAY);
                gl.glEnableClientState(GL2.GL_TEXTURE_COORD_ARRAY);
                gl.glVertexPointer(3, GL2.GL_FLOAT, 0, m_VertexBuffer);
                gl.glTexCoordPointer(2, GL2.GL_FLOAT, 0, m_TextureCoordBuffer);
                gl.glDrawArrays(GL2.GL_TRIANGLE_FAN, 0, m_VertexBuffer.limit() / 3);
                gl.glDisableClientState(GL2.GL_TEXTURE_COORD_ARRAY);
                gl.glDisableClientState(GL2.GL_VERTEX_ARRAY);

</pre></code>

PS what is the proper way to include code samples in this forum?