[SOLVED] FBObject Orientation/Scaling Issues

Hi

I'm trying to get a simple drawing routine to work using FBObject.

I'm basically just doing: draw quad to FBO -> draw FBO to screen

The goal is to have a quad drawn at (0,  0) with size 200x200 pixels.  I'm using immediate mode at the moment for testing purposes:

in GLAutoDrawable.reshape:

                fbo.reset(gl, width, height, glWin.getChosenGLCapabilities().getNumSamples(), true);
                fbo.attachTexture2D(gl, 0, true);
                fbo.attachRenderbuffer(gl, Attachment.Type.DEPTH, 32);
                fbo.syncSamplingSink(gl);

in GLAutoDrawable.display:

                gl.glClear(GL.GL_COLOR_BUFFER_BIT);
               
                fbo.bind(gl);

                handle.setViewport(0, 0, wt, ht, 1); // sets glOrtho(x, x+width, y, y+height, 0, 1)
                gl.glColor3f(1,0,0);
                gl.glBegin(GL2.GL_QUADS);
                gl.glVertex2f(0, 0);
                gl.glVertex2f(0, 200);
                gl.glVertex2f(200, 200);
                gl.glVertex2f(200, 0);
                gl.glEnd();
               
                fbo.syncSamplingSink(gl);
               
                final TextureAttachment tex0 = (TextureAttachment) fbo.getColorbuffer(0);
                gl.glActiveTexture(GL2.GL_TEXTURE0);
                gl.glEnable(GL2.GL_TEXTURE_2D);
                fbo.use(gl, tex0);
                gl.glBegin(GL2.GL_QUADS);
                gl.glVertex2f(0, 0);    gl.glTexCoord2f(0, 0);
                gl.glVertex2f(0, ht); gl.glTexCoord2f(0, 1);
                gl.glVertex2f(wt, ht); gl.glTexCoord2f(1, 1);
                gl.glVertex2f(wt, 0); gl.glTexCoord2f(1, 0);
                gl.glEnd();
                fbo.unuse(gl);

This results in a rectangular (not square as expected) quad drawn in the upper left hand corner, stretched along the X axis.

I'm guessing I'm missing something rather trivial here... but I haven't used FBObject before, so I'm not really sure what.

Any help would be greatly appreciated, as always.

In this case, the problem was nothing more than that the glTexCoord calls have to be BEFORE the glVertex calls.  Stupid FFP caveat that's easy to forget since most of us probably aren't used to dealing with it anymore.

                gl.glBegin(GL2.GL_QUADS);
                gl.glTexCoord2f(0, 0);
                gl.glVertex2f(0, 0);
                gl.glTexCoord2f(0, 1);
                gl.glVertex2f(0, ht);
                gl.glTexCoord2f(1, 1);
                gl.glVertex2f(wt, ht);
                gl.glTexCoord2f(1, 0);
                gl.glVertex2f(wt, 0);
                gl.glEnd();

In the worst case, I use glArrayElement but I prefer vertex arrays and VBOs of course. You could use com.jogamp.opengl.util.ImmModeSink too.